Parking air conditioner and control method, device, storage medium and program product thereof

Abstract

The application discloses a parking air conditioner and a control method, device, storage medium and computer program product thereof, wherein an outdoor environment temperature sensing bag is not arranged in an outdoor unit of the parking air conditioner; the method comprises the following steps: acquiring an air inlet temperature, an air outlet temperature, an indoor environment temperature, a target temperature and a discharge temperature of a compressor of an indoor unit of the parking air conditioner under the condition that the parking air conditioner is running; determining an indoor temperature difference correction value of the parking air conditioner according to the air inlet temperature, the air outlet temperature, the indoor environment temperature and the target temperature; and controlling a running frequency of the compressor based on the indoor temperature difference correction value and in combination with at least one of the indoor environment temperature and the discharge temperature of the compressor. According to the scheme, the outer ring temperature sensing bag of the parking air conditioner is cancelled, the running frequency of the compressor is controlled according to the air inlet temperature, the air outlet temperature, the indoor environment temperature and the discharge temperature of the compressor, wiring space is saved, cost is saved, the parking air conditioner outdoor unit is conducive to miniaturization design, and reliable running of the compressor is ensured.

Description

Technical Field

[0001] This invention belongs to the field of parking air conditioning technology, specifically relating to a control method, device, parking air conditioner, storage medium, and computer program product for a parking air conditioner, and particularly to a compressor operating frequency control method, device, parking air conditioner, storage medium, and computer program product for a parking air conditioner. Background Technology

[0002] A parking air conditioner is a type of air conditioner specifically designed for large freight vehicles such as trucks. It is typically installed on trucks or vans and can be used when parked, waiting, or resting, as well as during long-distance transportation. To achieve both cooling and energy-saving goals, it is essential to ensure precise control of the compressor's operating frequency and the reliability of the refrigerant control system.

[0003] In most solutions, an external ambient temperature sensor is installed on the outdoor unit of the parking air conditioner to obtain the corresponding temperature point. Based on this temperature point, the operating frequency of the parking air conditioner compressor can be precisely controlled. However, installing an external ambient temperature sensor on the outdoor unit results in complex wiring, occupies more space, hinders the miniaturization design of the outdoor unit, and also increases its cost.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a control method, device, air conditioner, storage medium, and computer program product for a parking air conditioner. This addresses the problem that related solutions rely on controlling the compressor's operating frequency based on the outdoor ambient temperature sensor installed on the outdoor unit of the parking air conditioner. However, installing the sensor on the outdoor unit results in complex wiring, large space requirements, hinders miniaturization, and increases costs. The invention eliminates the need for the external ambient temperature sensor and controls the compressor's operating frequency based on the air inlet temperature, outlet temperature, indoor ambient temperature, and compressor exhaust temperature. This not only saves wiring space and reduces costs but also facilitates miniaturization of the outdoor unit. Furthermore, it ensures reliable compressor operation, thus guaranteeing the reliable operation of the parking air conditioning system.

[0006] This invention provides a control method for a parking air conditioner. The outdoor unit of the parking air conditioner has a compressor, and the indoor unit has an air inlet and an air outlet. The outdoor unit does not have an outdoor ambient temperature sensor. The control method includes: acquiring the air inlet temperature, the air outlet temperature, the indoor ambient temperature, and the target temperature of the parking air conditioner, and acquiring the compressor's exhaust temperature while the parking air conditioner is operating; determining an indoor temperature difference correction value based on the air inlet temperature, the air outlet temperature, the indoor ambient temperature, and the target temperature; and controlling the compressor's operating frequency based on the indoor temperature difference correction value and at least one of the indoor ambient temperature and the compressor's exhaust temperature.

[0007] In some embodiments, determining the indoor temperature difference correction value of the parking air conditioner based on the inlet temperature, outlet temperature, indoor ambient temperature, and target temperature of the parking air conditioner includes: determining the absolute value of the difference between the target temperature and the inlet temperature of the parking air conditioner, denoted as the first inlet temperature difference; determining the absolute value of the difference between the target temperature and the outlet temperature of the parking air conditioner, denoted as the first outlet temperature difference; determining the absolute value of the difference between the indoor ambient temperature and the inlet temperature of the parking air conditioner, denoted as the second inlet temperature difference; and determining the absolute value of the difference between the indoor ambient temperature and the outlet temperature of the parking air conditioner, denoted as the second outlet temperature difference; and determining the indoor temperature difference correction value of the parking air conditioner based on the functional relationship between the first inlet temperature difference, the first outlet temperature difference, the second inlet temperature difference, and the second outlet temperature difference.

[0008] In some implementations, determining the indoor temperature difference correction value of the parking air conditioner based on the functional relationship between the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference includes: calculating the indoor temperature difference correction value of the parking air conditioner according to the following formula based on the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference:

[0009] ;

[0010] Where, ΔT 修 This represents the indoor temperature difference correction value of the parking air conditioner, ΔT. 进1 This represents the first inlet air temperature difference, ΔT. 出1 This represents the first outlet air temperature difference, ΔT. 进2This represents the second inlet air temperature difference, ΔT. 出2 This represents the second outlet air temperature difference, and k represents a preset calculation constant.

[0011] In some embodiments, controlling the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner, and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor, includes: determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner; controlling the compressor to run at the determined operating frequency of the compressor for a set time; determining whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then controlling the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then controlling the operating frequency of the compressor according to the exhaust temperature of the compressor.

[0012] In some embodiments, determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner includes: determining the temperature range within a set temperature range where the indoor temperature difference correction value of the parking air conditioner is located, and denoting it as the temperature range where the indoor temperature difference correction value of the parking air conditioner is located; according to the correspondence between the set temperature range and the set frequency, determining the set frequency corresponding to the set temperature range that is the same as the temperature range where the indoor temperature difference correction value of the parking air conditioner is located in the correspondence as the operating frequency of the compressor corresponding to the temperature range where the indoor temperature difference correction value of the parking air conditioner is located, so as to determine the operating frequency of the compressor.

[0013] In some embodiments, the set temperature range includes: a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval with sequentially increasing temperature values; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency with sequentially increasing frequency values; determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner further includes: if the indoor temperature difference correction value of the parking air conditioner is determined to be within the first temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the first frequency within the set frequency range, so as to control the compressor to run at the first frequency for a first set duration; correspondingly, controlling the operating frequency of the compressor according to the exhaust temperature of the compressor includes: if the indoor temperature difference correction value of the parking air conditioner is determined to be within the first temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the first frequency within the set frequency range. In this case, after controlling the compressor to run at the first frequency for a first set time, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, the relationship between the compressor's exhaust temperature and the preset exhaust protection frequency restriction temperature and the preset exhaust protection shutdown temperature is determined; if it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection shutdown temperature, then the process returns to continue controlling the compressor to run at the first frequency for a first set time, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection shutdown temperature, then the compressor is controlled to shut down.

[0014] In some embodiments, the set temperature range includes: a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval with sequentially increasing temperature values; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency with sequentially increasing frequency values; determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner further includes: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the second temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the second frequency within the set frequency range, so as to control the compressor to run at the second frequency for a second set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; correspondingly, controlling the operating frequency of the compressor according to the exhaust temperature of the compressor further includes: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the second temperature interval of the set temperature range, then controlling the compressor to run at the second frequency for a second set duration, and then determining the indoor ambient temperature of the parking air conditioner. The system checks whether the target temperature of the parking air conditioner has been reached. If the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, the system determines the relationship between the compressor's exhaust temperature and preset exhaust protection frequency restriction temperature, preset exhaust protection frequency reduction temperature, and preset exhaust protection shutdown temperature. If the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, the system returns to control the compressor to run at the second frequency for a second set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, the system controls the compressor to run at the first frequency for a first set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If the compressor's exhaust temperature is greater than or equal to the preset exhaust protection shutdown temperature, the system controls the compressor to shut down.

[0015] In some embodiments, the set temperature range includes: a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval with sequentially increasing temperature values; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency with sequentially increasing frequency values; determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner further includes: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the third temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the third frequency within the set frequency range, so as to control the compressor to run at the third frequency for a third set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; correspondingly, controlling the operating frequency of the compressor based on the exhaust temperature of the compressor further includes: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the third temperature interval of the set temperature range, then controlling the compressor to run at the third frequency for a third set duration, and then determining the indoor ambient temperature of the parking air conditioner. The system checks whether the target temperature of the parking air conditioner has been reached. If the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, the system determines the relationship between the compressor's exhaust temperature and preset exhaust protection frequency restriction temperature, preset exhaust protection frequency reduction temperature, and preset exhaust protection shutdown temperature. If the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, the system returns to control the compressor to run at the third frequency for a third set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, the system controls the compressor to run at the second frequency for a second set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If the compressor's exhaust temperature is greater than or equal to the preset exhaust protection shutdown temperature, the system controls the compressor to shut down.

[0016] In some embodiments, the set temperature range includes: a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval with sequentially increasing temperature values; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency with sequentially increasing frequency values; determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner further includes: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the fourth temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the fourth frequency within the set frequency range, so as to control the compressor to run at the fourth frequency for a fourth set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; correspondingly, controlling the operating frequency of the compressor based on the exhaust temperature of the compressor further includes: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the fourth temperature interval of the set temperature range, then controlling the compressor to run at the fourth frequency for a fourth set duration before determining the indoor ambient temperature of the parking air conditioner. The system checks whether the target temperature of the parking air conditioner has been reached. If the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, the system determines the relationship between the compressor's exhaust temperature and preset exhaust protection frequency restriction temperature, preset exhaust protection frequency reduction temperature, and preset exhaust protection shutdown temperature. If the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, the system returns to control the compressor to run at the fourth frequency for the fourth set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, the system controls the compressor to run at the second frequency for the second set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If the compressor's exhaust temperature is greater than or equal to the preset exhaust protection shutdown temperature, the system controls the compressor to shut down.

[0017] In conjunction with the above method, another aspect of the present invention provides a control device for a parking air conditioner, wherein the outdoor unit of the parking air conditioner has a compressor, the indoor unit of the parking air conditioner has an air inlet and an air outlet, and the outdoor unit of the parking air conditioner does not have an outdoor ambient temperature sensor; the control device for the parking air conditioner includes: an acquisition unit configured to acquire, while the parking air conditioner is running, the air inlet temperature of the parking air conditioner, the air outlet temperature of the parking air conditioner, the indoor ambient temperature of the parking air conditioner, a target temperature of the parking air conditioner, and the exhaust temperature of the compressor; a control unit configured to determine an indoor temperature difference correction value for the parking air conditioner based on the air inlet temperature of the parking air conditioner, the air outlet temperature of the parking air conditioner, the indoor ambient temperature of the parking air conditioner, and the target temperature of the parking air conditioner; the control unit is further configured to control the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor.

[0018] In some embodiments, the control unit determines an indoor temperature difference correction value for the parking air conditioner based on the inlet temperature, outlet temperature, indoor ambient temperature, and target temperature of the parking air conditioner. This includes: determining the absolute value of the difference between the target temperature and the inlet temperature of the parking air conditioner, denoted as a first inlet temperature difference; determining the absolute value of the difference between the target temperature and the outlet temperature of the parking air conditioner, denoted as a first outlet temperature difference; determining the absolute value of the difference between the indoor ambient temperature and the inlet temperature of the parking air conditioner, denoted as a second inlet temperature difference; and determining the absolute value of the difference between the indoor ambient temperature and the outlet temperature of the parking air conditioner, denoted as a second outlet temperature difference; and determining the indoor temperature difference correction value based on a functional relationship between the first inlet temperature difference, the first outlet temperature difference, the second inlet temperature difference, and the second outlet temperature difference.

[0019] In some embodiments, the control unit determines the indoor temperature difference correction value of the parking air conditioner based on the functional relationship between the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference, including: calculating the indoor temperature difference correction value of the parking air conditioner according to the following formula based on the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference:

[0020] ;

[0021] Where, ΔT 修 This represents the indoor temperature difference correction value of the parking air conditioner, ΔT. 进1This represents the first inlet air temperature difference, ΔT. 出1 This represents the first outlet air temperature difference, ΔT. 进2 This represents the second inlet air temperature difference, ΔT. 出2 This represents the second outlet air temperature difference, and k represents a preset calculation constant.

[0022] In some embodiments, the control unit controls the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner, and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor, including: determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner; controlling the compressor to run at the determined operating frequency of the compressor for a set time; determining whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then controlling the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then controlling the operating frequency of the compressor according to the exhaust temperature of the compressor.

[0023] In some embodiments, the control unit determines the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner, including: determining the temperature range within a set temperature range where the indoor temperature difference correction value of the parking air conditioner is located, and denoting it as the temperature range where the indoor temperature difference correction value of the parking air conditioner is located; and determining the set frequency corresponding to the set temperature range that is the same as the temperature range where the indoor temperature difference correction value of the parking air conditioner is located, according to the correspondence between the set temperature range and the set frequency, as the operating frequency of the compressor corresponding to the temperature range where the indoor temperature difference correction value of the parking air conditioner is located, so as to obtain the operating frequency of the compressor.

[0024] In some embodiments, the set temperature range includes: a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval with sequentially increasing temperature values; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency with sequentially increasing frequency values; the control unit determines the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner, and further includes: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the first temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the first frequency within the set frequency range, so as to control the compressor to run at the first frequency for a first set duration; correspondingly, the control unit controls the operating frequency of the compressor according to the exhaust temperature of the compressor, including: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the first temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the first frequency within the set frequency range, so as to control the compressor to run at the first frequency for a first set duration; correspondingly, the control unit controls the operating frequency of the compressor according to the exhaust temperature of the compressor, including: when it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the first temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the first frequency within the set frequency range, so as to control the compressor to run at the first frequency for a first set duration; Under a given temperature range, after controlling the compressor to run at the first frequency for a first set duration, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, the relationship between the compressor's exhaust temperature and a preset exhaust protection frequency restriction temperature and a preset exhaust protection shutdown temperature is determined. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection shutdown temperature, the process returns to continue controlling the compressor to run at the first frequency for a first set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection shutdown temperature, the compressor is controlled to shut down.

[0025] In some embodiments, the set temperature range includes: a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval with sequentially increasing temperature values; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency with sequentially increasing frequency values; the control unit, based on the indoor temperature difference correction value of the parking air conditioner, determines the operating frequency of the compressor, further including: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the second temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the second frequency within the set frequency range, so as to control the compressor to run at the second frequency for a second set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; correspondingly, the control unit, based on the exhaust temperature of the compressor, controls the operating frequency of the compressor, further including: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the second temperature interval of the set temperature range, then the compressor is controlled to run at the second frequency for a second set duration, and then the parking air conditioner... The system checks whether the indoor ambient temperature has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, the system determines the relationship between the compressor's exhaust temperature and preset exhaust protection frequency restriction temperature, preset exhaust protection frequency reduction temperature, and preset exhaust protection shutdown temperature. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, the system returns to control the compressor to run at the second frequency for a second set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, the system controls the compressor to run at the first frequency for a first set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection shutdown temperature, the system controls the compressor to shut down.

[0026] In some embodiments, the set temperature range includes: a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval with sequentially increasing temperature values; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency with sequentially increasing frequency values; the control unit, based on the indoor temperature difference correction value of the parking air conditioner, determines the operating frequency of the compressor, further including: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the third temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the third frequency within the set frequency range, so as to control the compressor to run at the third frequency for a third set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; correspondingly, the control unit, based on the exhaust temperature of the compressor, controls the operating frequency of the compressor, further including: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the third temperature interval of the set temperature range, then the compressor is controlled to run at the third frequency for a third set duration, and then the parking air conditioner... The system checks whether the indoor ambient temperature has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, it determines the relationship between the compressor's exhaust temperature and the preset exhaust protection frequency restriction temperature, the preset exhaust protection frequency reduction temperature, and the preset exhaust protection shutdown temperature. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, it returns to continue controlling the compressor to run at the third frequency for a third set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, it controls the compressor to run at the second frequency for a second set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection shutdown temperature, it controls the compressor to shut down.

[0027] In some embodiments, the set temperature range includes: a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval with sequentially increasing temperature values; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency with sequentially increasing frequency values; the control unit, based on the indoor temperature difference correction value of the parking air conditioner, determines the operating frequency of the compressor, further including: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the fourth temperature interval of the set temperature range, then the operating frequency of the compressor is determined to be the fourth frequency within the set frequency range, so as to control the compressor to run at the fourth frequency for a fourth set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; correspondingly, the control unit, based on the exhaust temperature of the compressor, controls the operating frequency of the compressor, further including: if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the fourth temperature interval of the set temperature range, then the compressor is controlled to run at the fourth frequency for a fourth set duration, and then the parking air conditioner... The system checks whether the indoor ambient temperature has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, it determines the relationship between the compressor's exhaust temperature and the preset exhaust protection frequency restriction temperature, the preset exhaust protection frequency reduction temperature, and the preset exhaust protection shutdown temperature. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, it returns to continue controlling the compressor to run at the fourth frequency for the fourth set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, it controls the compressor to run at the second frequency for the second set duration, and then continues to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection shutdown temperature, it controls the compressor to shut down.

[0028] In conjunction with the above-mentioned device, the present invention further provides a parking air conditioner, including: the control device for the parking air conditioner described above.

[0029] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device on which the storage medium is located executes the steps of the parking air conditioner control method described above.

[0030] In conjunction with the above method, the present invention further provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described parking air conditioner control method.

[0031] Therefore, the solution of this invention, for parking air conditioners, eliminates the outdoor ambient temperature sensor (i.e., outer ring temperature sensor) on the outdoor unit side of the parking air conditioner. When the parking air conditioner is running after being turned on, it acquires the inlet and outlet temperatures of the indoor unit side, the indoor ambient temperature, and the user-set temperature, and also acquires the compressor exhaust temperature. Based on the inlet and outlet temperatures, the indoor ambient temperature, and the user-set temperature, a temperature difference correction value is calculated. Based on the temperature difference correction value within the set temperature range, the compressor is controlled to run at the operating frequency corresponding to the corresponding temperature range for a certain period of time. Afterwards, if the indoor... When the ambient temperature reaches the user-set temperature, the compressor stops. If the indoor ambient temperature still does not reach the user-set temperature, the compressor operating frequency is adjusted according to the compressor discharge temperature until the indoor ambient temperature reaches the user-set temperature and then stops, or the compressor discharge temperature exceeds the compressor discharge protection shutdown temperature. Thus, by eliminating the outer ring temperature sensor of the parking air conditioner, the compressor operating frequency is controlled based on the inlet and outlet temperatures of the parking air conditioner, the indoor ambient temperature, and the compressor discharge temperature. This not only saves wiring space and costs but also facilitates the miniaturization design of the parking air conditioner outdoor unit. Furthermore, it ensures reliable compressor operation, making the parking air conditioning system reliable.

[0032] Other features and advantages of the present invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The technical solutions of the present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0033] Figure 1 This is a flowchart illustrating an embodiment of the parking air conditioner control method of the present invention;

[0034] Figure 2 This is a flowchart illustrating an embodiment of the method of the present invention for determining the indoor temperature difference correction value of the parking air conditioner;

[0035] Figure 3 This is a schematic flowchart of an embodiment of the method of the present invention for controlling the operating frequency of the compressor;

[0036] Figure 4 This is a flowchart illustrating an embodiment of the method for determining the operating frequency of the compressor according to the present invention.

[0037] Figure 5This is a schematic flowchart of an embodiment of the method of the present invention, in which the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor after the compressor is controlled to run at the first frequency for a first set time.

[0038] Figure 6 This is a schematic flowchart of an embodiment of the method of the present invention, in which the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor after the compressor is controlled to run at the second frequency for a second set time.

[0039] Figure 7 This is a schematic flowchart of an embodiment of the method of the present invention, in which the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor after the compressor is controlled to run at the third frequency for a third set time.

[0040] Figure 8 This is a schematic flowchart of an embodiment of the method of the present invention, in which the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor after the compressor is controlled to run at the fourth frequency for a fourth set duration.

[0041] Figure 9 This is a schematic diagram of the structure of an embodiment of the parking air conditioner control device of the present invention;

[0042] Figure 10 This is a schematic diagram of the overall process for controlling the operating frequency of a parking air conditioner compressor;

[0043] Figure 11 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 1 ;

[0044] Figure 12 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 2 ;

[0045] Figure 13 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 3 ;

[0046] Figure 14 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 4 .

[0047] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows: 102 - acquisition unit; 104 - control unit. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0049] Considering that related solutions control the compressor operating frequency based on the outdoor ambient temperature obtained from an external ambient temperature sensor installed on the outdoor unit of the parking air conditioner, this method results in complex wiring and large space occupation, hindering miniaturization and increasing costs. Furthermore, with the rapid development of the logistics industry, truck drivers often live in their vehicles to save on transportation costs, leading to higher demands for comfort and power consumption from parking air conditioners. Therefore, miniaturization and simplification of parking air conditioner design have become industry challenges. This invention proposes a control method for parking air conditioners, specifically a compressor operating frequency control method. By analyzing the relationship between the indoor unit's inlet and outlet temperatures, the indoor ambient temperature, and the set temperature, the compressor's operating status can be determined using the compressor's exhaust temperature without relying on outdoor ambient temperature, allowing for precise control of the compressor's operating frequency. This eliminates the need for an external ambient temperature sensor, saving wiring space and costs, and facilitating miniaturization of the outdoor unit. Moreover, it solves the compressor reliability issues present in related solutions, ensuring reliable operation of the parking air conditioning system.

[0050] The present invention employs a compressor exhaust temperature protection mechanism. Compared to related solutions, the present invention eliminates one external environmental temperature sensor while retaining the compressor exhaust temperature sensor. Although this adds an extra exhaust temperature sensor compared to related solutions, it is highly beneficial for ensuring the operational stability of the compressor. Related solutions simultaneously eliminate the compressor exhaust temperature sensor, saving wiring space and cost, but controlling the compressor operating frequency through temperature correction values ​​and internal pipe temperatures results in lower system reliability compared to the present invention. Compressor exhaust temperature is a parameter that directly reflects the compressor's operating status. The present invention controls the compressor operating frequency through temperature difference correction values ​​and compressor exhaust temperature, making the system more reliable and stable.

[0051] According to an embodiment of the present invention, a method for controlling a parking air conditioner is provided, such as... Figure 1The diagram shows a flowchart of an embodiment of the method of the present invention. The outdoor unit of the parking air conditioner has a compressor, the indoor unit of the parking air conditioner has an air inlet and an air outlet, and the outdoor unit of the parking air conditioner does not have an outdoor ambient temperature sensor, but does have a compressor exhaust temperature sensor; in the solution of the present invention, as... Figure 1 As shown, the control method for the parking air conditioner includes steps S110 to S130.

[0052] In step S110, when the parking air conditioner is running, the following are obtained: the inlet temperature of the parking air conditioner, the outlet temperature of the parking air conditioner, the indoor ambient temperature of the parking air conditioner, the target temperature of the parking air conditioner, and the exhaust temperature of the compressor; wherein, the inlet temperature of the parking air conditioner is as shown in the real-time inlet temperature T. 进 The air outlet temperature of the parking air conditioner is such as the real-time air outlet temperature T. 出 The indoor ambient temperature of the parking air conditioner is as follows: indoor ambient temperature T 内 The target temperature of the parking air conditioner is as set by the user, T. 设 The exhaust temperature of the compressor is like the exhaust temperature T of the parking air conditioning compressor. 排气 The air inlet temperature of the parking air conditioner is the temperature of the air inlet of the indoor unit of the parking air conditioner; the air outlet temperature of the parking air conditioner is the temperature of the air outlet of the indoor unit of the parking air conditioner.

[0053] In step S120, based on the inlet temperature of the parking air conditioner, the outlet temperature of the parking air conditioner, the indoor ambient temperature of the parking air conditioner, and the target temperature of the parking air conditioner, an indoor temperature difference correction value for the parking air conditioner is determined; wherein, the indoor temperature difference correction value for the parking air conditioner is, for example, the temperature difference correction value ΔT. 修 .

[0054] In step S130, based on the indoor temperature difference correction value of the parking air conditioner, and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor, the operating frequency of the compressor is controlled so as to: adjust the operating frequency of the compressor according to the operating status of the compressor in the case that the parking air conditioner does not have an outdoor ambient temperature sensor, so as to make the compressor operate reliably.

[0055] The solution of this invention, by using the inlet and outlet temperatures of the indoor unit of the parking air conditioner, the indoor ambient temperature, and the set temperature, can determine the compressor's operating status without relying on the outdoor ambient temperature, and precisely control the compressor's operating frequency to ensure system reliability. It also eliminates the need for an external ambient temperature sensor, saving wiring space and costs, and facilitating the miniaturization of the parking air conditioner's outdoor unit. Furthermore, it solves the compressor reliability issues present in related solutions, ensuring reliable operation of the parking air conditioning system.

[0056] In some embodiments, the specific process of determining the indoor temperature difference correction value of the parking air conditioner in step S120 based on the air inlet temperature of the parking air conditioner, the air outlet temperature of the parking air conditioner, the indoor ambient temperature of the parking air conditioner, and the target temperature of the parking air conditioner is described in the following exemplary description.

[0057] The following is combined with Figure 2 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for determining the indoor temperature difference correction value of the parking air conditioner. It further illustrates the specific process of determining the indoor temperature difference correction value of the parking air conditioner in step S120, including steps S210 to S220.

[0058] Step S210: Determine the absolute value of the difference between the target temperature of the parking air conditioner and the air inlet temperature of the parking air conditioner, denoted as the first air inlet temperature difference; determine the absolute value of the difference between the target temperature of the parking air conditioner and the air outlet temperature of the parking air conditioner, denoted as the first air outlet temperature difference; determine the absolute value of the difference between the indoor ambient temperature of the parking air conditioner and the air inlet temperature of the parking air conditioner, denoted as the second air inlet temperature difference; and determine the absolute value of the difference between the indoor ambient temperature of the parking air conditioner and the air outlet temperature of the parking air conditioner, denoted as the second air outlet temperature difference; wherein, the first air inlet temperature difference is ΔT 进1 The first outlet air temperature difference is ΔT 出1 The second air intake temperature difference is ΔT 进2 The second outlet air temperature difference is as follows: ΔT 出2 .

[0059] Step S220: Based on the functional relationship between the first air inlet temperature difference, the first air outlet temperature difference, the second air inlet temperature difference, and the second air outlet temperature difference, determine the indoor temperature difference correction value of the parking air conditioner. Based on the indoor temperature difference correction value of the parking air conditioner, and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor, control the operating frequency of the compressor so that: in the absence of an outdoor ambient temperature sensor in the parking air conditioner, the operating frequency of the compressor is adjusted according to the operating status of the compressor to ensure reliable operation of the compressor.

[0060] The present invention utilizes the functional relationship between the air inlet temperature, air outlet temperature, indoor ambient temperature, and set temperature of the parking air conditioner indoor unit to determine the compressor's operating status without relying on outdoor ambient temperature conditions. This allows for precise control of the compressor's operating frequency, ensuring system reliability and resolving the compressor's operational reliability issues present in related solutions, thus enabling the parking air conditioning system to operate reliably.

[0061] In some implementations, step S220, determining the indoor temperature difference correction value of the parking air conditioner based on the functional relationship between the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference, includes:

[0062] Based on the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference, the indoor temperature difference correction value of the parking air conditioner is calculated according to the following formula:

[0063] ;

[0064] Where, ΔT 修 This represents the indoor temperature difference correction value of the parking air conditioner, ΔT. 进1 This represents the first inlet air temperature difference, ΔT. 出1 This represents the first outlet air temperature difference, ΔT. 进2 This represents the second inlet air temperature difference, ΔT. 出2 This represents the second outlet air temperature difference, and k represents a preset calculation constant.

[0065] In some implementations, step S120, which determines the indoor temperature difference correction value of the parking air conditioner based on the inlet temperature, outlet temperature, indoor ambient temperature, and target temperature of the parking air conditioner, further includes: Firstly, determining the absolute value of the difference between the target temperature and the inlet temperature of the parking air conditioner, denoted as the first inlet temperature difference; determining the absolute value of the difference between the target temperature and the outlet temperature of the parking air conditioner, denoted as the first outlet temperature difference; determining the absolute value of the difference between the indoor ambient temperature and the inlet temperature of the parking air conditioner, denoted as the second inlet temperature difference; and determining the absolute value of the difference between the indoor ambient temperature and the outlet temperature of the parking air conditioner, denoted as the second outlet temperature difference; wherein, the first inlet temperature difference is ΔT. 进1 The first outlet air temperature difference is ΔT 出1 The second air intake temperature difference is ΔT 进2 The second outlet air temperature difference is as follows: ΔT 出2 .

[0066] Step 2: Based on the first air inlet temperature difference, the first air outlet temperature difference, the second air inlet temperature difference, and the second air outlet temperature difference, calculate the indoor temperature difference correction value of the parking air conditioner using the following formula:

[0067] ;

[0068] Where, ΔT 修 This represents the indoor temperature difference correction value of the parking air conditioner, ΔT. 进1 This represents the first inlet air temperature difference, ΔT. 出1 This represents the first outlet air temperature difference, ΔT. 进2 This represents the second inlet air temperature difference, ΔT. 出2 This represents the second outlet air temperature difference, and k represents a preset calculation constant.

[0069] Figure 10 This is a schematic diagram of the overall flow of a method for controlling the operating frequency of a parking air conditioner compressor. Figure 10 As shown, the overall flow of the compressor operating frequency control method for the parking air conditioner includes:

[0070] Step 1: The vehicle is equipped with a parking air conditioner, which has an indoor unit and an outdoor unit. A temperature sensor is installed at both the air inlet and outlet of the indoor unit to obtain the real-time air inlet temperature T. 进 and real-time air outlet temperature T 出 And obtain the indoor ambient temperature T of the parking air conditioner. 内 and user-set temperature T 设 Then proceed to step 2.

[0071] Step 2: Calculate the user-set temperature T. 设 With real-time air inlet temperature T 进 and real-time air outlet temperature T 出 The absolute value of the difference ΔT 进1 =|T 设 -T 进 |,ΔT 出1 =|T 设 -T 出 Indoor ambient temperature T 内 With real-time air inlet temperature T 进 and real-time air outlet temperature T 出 The absolute value of the difference ΔT 进2 =|T 内 -T 进 |,ΔT 出2 =|T 内 -T 出 Then proceed to step 3.

[0072] Step 3: Calculate the temperature difference correction value ΔT 修To accurately determine the indoor load, step 4 is then performed. This includes calculating the temperature difference correction value ΔT. 修 The method is as follows:

[0073] (1).

[0074] In the calculation process of Equation (1), only numerical values ​​are involved, and no unit conversion is involved; the numerical values ​​on both sides of the equation in Equation (1) represent temperature (unit ℃). The solution of the present invention eliminates the external environment temperature sensor of the parking air conditioner outdoor unit, solves the problem of complex wiring of the parking air conditioner outdoor unit, saves wiring space, saves costs, and enables the parking air conditioner outdoor unit to be miniaturized; it is conducive to the miniaturized design of the parking air conditioner outdoor unit and reduces development costs; by using the compressor exhaust temperature, the operating status of the compressor at this time is determined, the operating frequency of the compressor is accurately controlled, and the system reliability is guaranteed.

[0075] In some embodiments, the specific process of controlling the operating frequency of the compressor in step S130 based on the indoor temperature difference correction value of the parking air conditioner, and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor, is described in the following exemplary description. The following is in conjunction with... Figure 3 The flowchart of an embodiment of the method of the present invention for controlling the operating frequency of the compressor is shown below. The specific process of controlling the operating frequency of the compressor in step S130 is further explained, including steps S310 to S350.

[0076] Step S310: Determine the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner.

[0077] Step S320: Control the compressor to run at the determined operating frequency of the compressor for a set time; wherein, the set time is such as time t.

[0078] Step S330: After controlling the compressor to run at the determined operating frequency for a set time, determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner.

[0079] Step S340: If it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to stop.

[0080] Step S350: If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor.

[0081] like Figure 10 As shown, the overall flow of the compressor operating frequency control method for the parking air conditioner also includes:

[0082] Step 4: Adjust the temperature difference correction value ΔT 修 Comparing with different set values, the operating frequency F of the parking air conditioning compressor is determined based on the comparison results, and then step 5 is executed. In step 4, the temperature difference correction value ΔT is used. 修 Determine the indoor temperature load, and then determine the operating frequency F of the parking air conditioning compressor. Different setpoints are set by the control system, equivalent to values ​​already preset in the control program; the temperature difference correction value ΔT is then applied. 修 Compare with different set values ​​to accurately determine the indoor temperature load.

[0083] Step 5: After the compressor runs at the operating frequency F for a time t, the user-set temperature T is detected. 设 Has the indoor ambient temperature T been reached? 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 6; otherwise, proceed to step 7. Here, t time can be the normal operating time of the inverter air conditioner compressor. For example, if the set temperature is 25℃, and the compressor runs at frequency F for t time, the compressor will stop if the set temperature has reached 25℃; otherwise, it will continue running.

[0084] Step 6: If the user sets the temperature T 设 If the target has been reached, the compressor will stop.

[0085] Step 7: If the user sets the temperature T 设 If the temperature is still not reached, then check the compressor discharge temperature T at this time. 排气 and the compressor discharge temperature T 排气 The compressor's operating status is compared with different set values ​​to determine whether the system is operating reliably. Then, step 8 is executed.

[0086] Step 8: Based on the comparison results above, determine the compressor operating frequency F again to ensure system reliability. In step 8, the temperature difference correction value ΔT is used. 修 User-set temperature T 设 With compressor discharge temperature T 排气 The compressor operating frequency F is determined to accurately control the operating frequency F of the parking air conditioning compressor and ensure system reliability.

[0087] In some implementations, the process of determining the compressor's operating frequency in step S310 based on the indoor temperature difference correction value of the parking air conditioner is described in the following exemplary description. The following is in conjunction with... Figure 4The flowchart of an embodiment of the method of the present invention for determining the operating frequency of the compressor is shown below. The specific process of determining the operating frequency of the compressor in step S310 is further explained, including steps S410 to S420.

[0088] Step S410: Determine the temperature range within which the indoor temperature difference correction value of the parking air conditioner falls within the set temperature range, and record it as the temperature range within which the indoor temperature difference correction value of the parking air conditioner falls.

[0089] Step S420: Based on the correspondence between set temperature ranges and set frequencies, the set frequency corresponding to the set temperature range that is the same as the temperature range where the indoor temperature difference correction value of the parking air conditioner is located is determined as the operating frequency of the compressor corresponding to the temperature range where the indoor temperature difference correction value of the parking air conditioner is located, thereby determining the operating frequency of the compressor. Of course, this set frequency is a frequency within the set frequency range.

[0090] like Figure 10 As shown, the overall flow of the compressor operating frequency control method for the parking air conditioner also includes: in step 4, adjusting the compressor operating frequency based on the temperature difference correction value ΔT. 修 Determine the indoor temperature load, and then determine the operating frequency F of the parking air conditioning compressor. Different setpoints are set by the control system, equivalent to values ​​already preset in the control program; the temperature difference correction value ΔT is then applied. 修 By comparing different set values, the indoor temperature load can be accurately determined, and then the compressor operating frequency can be accurately determined based on the indoor temperature load to ensure system reliability.

[0091] In some implementations, the set temperature range includes: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially. The first temperature range is such as (-∞, temperature ΔT1), the second temperature range is such as [temperature ΔT1, temperature ΔT2), the third temperature range is such as [temperature ΔT2, temperature ΔT3), and the fourth temperature range is such as [temperature ΔT3, +∞). The set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. The first frequency is such as frequency F1, the second frequency is such as frequency F2, the third frequency is such as frequency F3, and the fourth frequency is such as frequency F4. Step S310, which determines the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner, further includes: determining the operating frequency of the compressor when the indoor temperature difference correction value of the parking air conditioner is within a first temperature range, specifically as follows: If the temperature range within the set temperature range where the indoor temperature difference correction value of the parking air conditioner is determined to be the first temperature range, then the operating frequency of the compressor is determined to be the first frequency within the set frequency range, so that the compressor is controlled to run at the first frequency for a first set duration. Then, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then the compressor is controlled to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor; wherein, the first set duration is such as time t1.

[0092] Accordingly, after controlling the compressor to run at the first frequency for a first set time, and determining that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, step S350, which controls the operating frequency of the compressor based on the exhaust temperature of the compressor, includes: controlling the operating frequency of the compressor based on the exhaust temperature of the compressor after controlling the compressor to run at the first frequency for a first set time.

[0093] The following is combined with Figure 5 The schematic diagram of an embodiment of the method of the present invention, which controls the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the first frequency for a first set time, further illustrates the specific process of controlling the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the first frequency for a first set time in step S350, including: steps S510 to S530.

[0094] Step S510: If the indoor temperature difference correction value of the parking air conditioner falls within the set temperature range and is considered a first temperature range, then after controlling the compressor to run at the first frequency for a first set duration, determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature. If the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, determine the relationship between the compressor's exhaust temperature, a preset exhaust protection frequency restriction temperature, and a preset exhaust protection shutdown temperature. The preset exhaust protection frequency restriction temperature is, for example, temperature T. 排气保护禁频 The preset exhaust protection shutdown temperature is such as temperature T. 排气保护停机 .

[0095] Step S520: If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection shutdown temperature, then return to continue controlling the compressor to run at the first frequency for a first set time, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to shut down; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then control the compressor's operating frequency according to the compressor's exhaust temperature.

[0096] Step S530: If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection shutdown temperature, then the compressor is controlled to shut down.

[0097] Figure 11 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 1 , Figure 12 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 2 , Figure 13 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 3 , Figure 14 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 4 The following is combined with Figure 11 , Figure 12 , Figure 13 and Figure 14 The example shown illustrates the specific flow of the compressor operating frequency control method for the parking air conditioner in the present invention. Figure 11 As shown, the flow chart of the compressor operating frequency control method for the parking air conditioner includes: Step 11, determining whether the temperature difference correction value ΔT is met. 修<Temperature ΔT1: If yes, proceed to step 12. Step 12: When the temperature difference correction value ΔT is satisfied... 修 When the temperature is less than ΔT1, execute step S1: control the compressor to run at a low speed (e.g., speed 1) for time t1, then execute step 13. In step 12, when the temperature difference correction value ΔT is met... 修 When the temperature is less than ΔT1, the load inside the cab is very small. At this time, a large amount of cooling is not needed to maintain the comfort of the cab. Then, the compressor is controlled to run at a low speed (such as speed 1) at a frequency of F1 for t1 time, and then step 13 is executed.

[0098] Step 13: Determine if the user-set temperature T is met at this time. 设 The indoor ambient temperature T has been reached. 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 14; otherwise, proceed to step 15.

[0099] Step 14: If the user sets the temperature T at this time... 设 If the target has been reached, then control the compressor to stop.

[0100] Step 15: If the user sets the temperature T at this time... 设 If the temperature is still not reached, then check the compressor discharge temperature T at this time. 排气 and the compressor discharge temperature T 排气 Compared with different set values, specifically: determining whether the temperature T is met. 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 If yes, proceed to step 16; otherwise, proceed to step 17.

[0101] Step 16: If temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 Then return to step S1 to continue controlling the compressor to run at a low speed (e.g., speed 1) at frequency F1 for time t1, and then execute step 13. Here, "exhaust protection frequency restriction" refers to the compressor exhaust temperature being greater than T. 排气保护禁频 At this time, the compressor frequency must not be increased.

[0102] In step 16, if temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 This indicates that the compressor discharge temperature T at this time is... 排气 Within the normal range, the compressor can still meet the indoor cooling demand by operating at its original frequency, i.e., at a low setting (such as setting 1) F1, until the user-set temperature T is reached. 设 The machine will shut down once the target temperature is reached.

[0103] Step 17: If temperature T is not met 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 Then determine whether the compressor discharge temperature T is satisfied. 排气 ≥Temperature T 排气保护停机 If so, then control the compressor to stop.

[0104] In step 17, if the compressor discharge temperature T is satisfied... 排气 ≥Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 It has already exceeded the compressor discharge protection shutdown temperature T. 排气保护停机 To prevent the compressor discharge temperature T from being triggered 排气 The protection shutdown command requires the compressor to stop to ensure system reliability.

[0105] After triggering the compressor discharge temperature protection shutdown command, the compressor stops. Only after a certain period, when the compressor discharge temperature is less than or equal to the compressor discharge protection release temperature, is the entire unit allowed to start operating; otherwise, it is not allowed to start operating. This invention, based on the functional relationship between the inlet and outlet temperatures of the parking air conditioner's indoor unit, the indoor ambient temperature, and the set temperature, as well as the compressor discharge temperature, can precisely control the compressor's operating frequency without relying on external ambient temperature conditions. This prevents the compressor frequency from failing to reach the set frequency due to triggering the compressor discharge temperature protection shutdown command, effectively ensuring system reliability while achieving cooling and energy saving.

[0106] In some implementations, a temperature range is defined, including: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially. The first temperature range is such as (-∞, temperature ΔT1), the second temperature range is such as [temperature ΔT1, temperature ΔT2), the third temperature range is such as [temperature ΔT2, temperature ΔT3), and the fourth temperature range is such as [temperature ΔT3, +∞). A frequency range is defined, including: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. The first frequency is such as frequency F1, the second frequency is such as frequency F2, the third frequency is such as frequency F3, and the fourth frequency is such as frequency F4. Step S310, based on the indoor temperature difference correction value of the parking air conditioner, determines the operating frequency of the compressor. This further includes the process of determining the operating frequency of the compressor when the indoor temperature difference correction value of the parking air conditioner is within the second temperature range, as detailed below:

[0107] If the indoor temperature difference correction value of the parking air conditioner is determined to be within the second temperature range within the set temperature range, then the operating frequency of the compressor is determined to be the second frequency within the set frequency range, so that the compressor is controlled to run at the second frequency for a second set duration. Then, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then the compressor is controlled to stop. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor. The second set duration is, for example, time t2.

[0108] Accordingly, after controlling the compressor to run at the second frequency for the second set duration, and determining that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, step S350, which controls the operating frequency of the compressor based on the exhaust temperature of the compressor, further includes: controlling the operating frequency of the compressor based on the exhaust temperature of the compressor after controlling the compressor to run at the second frequency for the second set duration.

[0109] The following is combined with Figure 6 The schematic diagram of an embodiment of the method of the present invention, which controls the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the second frequency for a second set time, further illustrates the specific process of controlling the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the second frequency for a second set time in step S350, including: steps S610 to S640.

[0110] Step S610: If the indoor temperature difference correction value of the parking air conditioner falls within the set temperature range and is located in the second temperature range, then after controlling the compressor to run at the second frequency for a second set duration, determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, determine the relationship between the compressor's exhaust temperature and the preset exhaust protection frequency restriction temperature, the preset exhaust protection frequency reduction temperature, and the preset exhaust protection shutdown temperature. The preset exhaust protection frequency restriction temperature is, for example, temperature T. 排气保护禁频 The preset exhaust protection frequency reduction temperature is such as temperature T. 排气保护降频 The preset exhaust protection shutdown temperature is such as temperature T. 排气保护停机 .

[0111] Step S620: If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, then return to continue controlling the compressor to run at the second frequency for the second set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then control the operating frequency of the compressor according to the exhaust temperature of the compressor.

[0112] Step S630: If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, then the compressor is controlled to run at the first frequency for a first set duration, i.e., the process jumps to controlling the compressor to run at the first frequency for a first set duration. Then, it is further determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then the compressor is controlled to shut down. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then the operating frequency of the compressor is controlled according to the compressor's exhaust temperature.

[0113] Step S640: If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection shutdown temperature, then the compressor is controlled to shut down.

[0114] Combination Figure 11 The example shown is as follows: Figure 12 As shown, the flow chart of the compressor operating frequency control method for the parking air conditioner also includes:

[0115] Step 21: Determine whether the temperature difference correction value ΔT is met. 修 <Temperature ΔT1, when the temperature difference correction value ΔT is not met 修 When the temperature is less than ΔT1, determine whether the temperature ΔT1 ≤ temperature difference correction value ΔT 修 <Temperature ΔT2: If so, proceed to step 22.

[0116] Step 22: When the temperature ΔT1 ≤ temperature difference correction value ΔT 修 When the temperature is <T2, execute step S2: control the compressor to run at a medium speed (e.g., speed 2) for time t2, and then execute step 23.

[0117] In step 22, when the temperature ΔT1 ≤ temperature difference correction value ΔT 修<Temperature ΔT2, at this time the load on the cab side is low, the load on the cab side is in the low to medium range, the compressor can meet the cooling demand of the cab by running at the medium level (level 2) frequency F2, there is no need to run at a higher frequency to waste energy, so control the compressor to run at the medium level frequency F2 for t2 time, and then execute step 23.

[0118] Step 23: Determine if the user-set temperature T is met at this time. 设 The indoor ambient temperature T has been reached. 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 24; otherwise, proceed to step 25.

[0119] Step 24: If the user sets the temperature T at this time... 设 If the target has been reached, then control the compressor to stop.

[0120] Step 25: If the user sets the temperature T at this time... 设 The temperature has not yet been reached; check the compressor discharge temperature T at this point. 排气 and the compressor discharge temperature T 排气 Compared with different set values, specifically: determining whether the temperature T is met. 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 If yes, proceed to step 26; otherwise, proceed to step 27. Here, "exhaust protection frequency reduction" refers to the compressor exhaust temperature exceeding T. 排气保护降频 The compressor frequency is reduced by one level.

[0121] Step 26: If temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 If so, return to step S2 to continue controlling the compressor to run at a medium speed (such as speed 2) at a frequency F2 for time t2, and then execute step 23.

[0122] In step 26, if temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 At this time, the compressor discharge temperature T 排气 Within the normal range, the compressor discharge temperature T 排气 The temperature is not too high, so the compressor discharge temperature protection shutdown command will not be triggered. The compressor will continue to operate at its original frequency, i.e., at a low setting (such as setting 2) F2. This satisfies the indoor cooling demand, and continuing to operate at a medium frequency allows for faster cooling and improves user comfort, until the user's set temperature T is met. 设 The system has reached shutdown.

[0123] Step 27: If temperature T is not met排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 Then determine whether the temperature T is satisfied. 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 If yes, proceed to step S1 to continue controlling the compressor to run at a low speed (e.g., speed 1) at frequency F1 for time t1, and then execute step 13; otherwise, execute step 28.

[0124] In step 27, if temperature T is satisfied... 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 Although the temperature has risen, it is still within a safe range. However, to prevent the compressor's discharge temperature protection shutdown command from being triggered, the compressor's operating frequency needs to be reduced to a lower setting for reliable operation. The compressor operating frequency should be reduced to level 1 until the indoor temperature reaches the user-set temperature T. 设 Shutdown.

[0125] Step 28: Determine if the compressor discharge temperature T is met. 排气 ≥Temperature T 排气保护停机 If the compressor discharge temperature T is satisfied 排气 ≥Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 The temperature has exceeded the compressor discharge temperature protection shutdown temperature. To prevent the compressor discharge temperature protection shutdown command from being triggered, the compressor must be shut down to ensure system reliability.

[0126] In some implementations, a temperature range is defined, including: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially. The first temperature range is such as (-∞, temperature ΔT1), the second temperature range is such as [temperature ΔT1, temperature ΔT2), the third temperature range is such as [temperature ΔT2, temperature ΔT3), and the fourth temperature range is such as [temperature ΔT3, +∞). A frequency range is defined, including: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. The first frequency is such as frequency F1, the second frequency is such as frequency F2, the third frequency is such as frequency F3, and the fourth frequency is such as frequency F4. Step S310, based on the indoor temperature difference correction value of the parking air conditioner, determines the operating frequency of the compressor. This further includes the process of determining the operating frequency of the compressor when the indoor temperature difference correction value of the parking air conditioner is in the third temperature range, as detailed below:

[0127] If the indoor temperature difference correction value of the parking air conditioner is determined to be within the third temperature range within the set temperature range, then the operating frequency of the compressor is determined to be the third frequency within the set frequency range, so that the compressor is controlled to run at the third frequency for a third set duration. Then, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then the compressor is controlled to stop. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor. The third set duration is, for example, time t3.

[0128] Accordingly, after controlling the compressor to run at the third frequency for the third set duration, and determining that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, controlling the operating frequency of the compressor according to the exhaust temperature of the compressor further includes: controlling the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the third frequency for the third set duration.

[0129] The following is combined with Figure 8 The schematic diagram of an embodiment of the method of the present invention, which controls the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the third frequency for a third set time, further illustrates the specific process of controlling the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the third frequency for a third set time in step S350, including: steps S710 to S740.

[0130] Step S710: If the indoor temperature difference correction value of the parking air conditioner falls within the third temperature range of the set temperature range, then after controlling the compressor to run at the third frequency for a third set duration, determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, determine the relationship between the compressor's exhaust temperature and the preset exhaust protection frequency restriction temperature, the preset exhaust protection frequency reduction temperature, and the preset exhaust protection shutdown temperature. The preset exhaust protection frequency restriction temperature is, for example, temperature T. 排气保护禁频 The preset exhaust protection frequency reduction temperature is such as temperature T. 排气保护降频 The preset exhaust protection shutdown temperature is such as temperature T. 排气保护停机 .

[0131] Step S720: If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, then return to continue controlling the compressor to run at the third frequency for the third set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then control the operating frequency of the compressor according to the compressor's exhaust temperature.

[0132] Step S730: If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, then the compressor is controlled to run at the second frequency for a second set duration, i.e., the process jumps to controlling the compressor to run at the second frequency for a second set duration. Then, it is further determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then the compressor is controlled to shut down. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then the operating frequency of the compressor is controlled according to the compressor's exhaust temperature.

[0133] Step S740: If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection shutdown temperature, then the compressor is controlled to shut down.

[0134] Combination Figure 11 and Figure 12 The example shown is as follows: Figure 13 As shown, the flow chart of the compressor operating frequency control method for the parking air conditioner also includes: Step 31, determining whether the temperature ΔT1 ≤ temperature difference correction value ΔT 修 <Temperature ΔT2, when temperature ΔT1 ≤ temperature difference correction value ΔT 修 When the temperature is less than ΔT2, determine whether the temperature ΔT2 ≤ temperature difference correction value ΔT 修 <Temperature ΔT3: If so, proceed to step 32.

[0135] Step 32: When the temperature ΔT2 ≤ temperature difference correction value ΔT 修 When the temperature is <T3, execute step S3: control the compressor to run at a medium-high level (e.g., level 3) at a frequency F3 for time t3, and then execute step 33.

[0136] In step 32, when the temperature ΔT2 ≤ temperature difference correction value ΔT 修<Temperature ΔT3, at this time the load in the cab is high, in the medium-high range, the demand for cooling in the cab is large, the first two operating frequencies can no longer meet the rapid cooling, so control the compressor to run at medium-high (3rd level) frequency F3 for t3 time, and then execute step 33.

[0137] Step 33: Determine if the user-set temperature T is met at this time. 设 The indoor ambient temperature T has been reached. 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 34; otherwise, proceed to step 35.

[0138] Step 34: If the user sets the temperature T at this time... 设 If the target has been reached, then control the compressor to stop.

[0139] Step 35: If the user sets the temperature T at this time... 设 The temperature has not yet been reached; check the compressor discharge temperature T at this time. 排气 and the compressor discharge temperature T 排气 Compared with different set values, specifically: determining whether the temperature T is met. 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 If yes, proceed to step 36; otherwise, proceed to step 37.

[0140] Step 36: If temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 If so, return to step S3 to continue controlling the compressor to run at a medium-high level (such as level 3) at a frequency F3 for t3 time, and then execute step 33.

[0141] In step 36, if the user sets the temperature T at this time... 设 The temperature has not yet been reached; check the compressor discharge temperature T at this time. 排气 If temperature T is satisfied 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 At this time, the compressor discharge temperature T 排气 Within the normal range, the compressor discharge temperature T 排气 The temperature is not too high, so the compressor discharge temperature protection shutdown command will not be triggered. The compressor will continue to operate at its original frequency. This satisfies the indoor cooling demand, and continuing to operate at a medium-to-high frequency will allow for faster cooling and improve user comfort, until the user's set temperature T is met. 设 The system has reached shutdown.

[0142] Step 37: If temperature T is not met 排气保护禁频 ≤ Compressor discharge temperature T排气 <Temperature T 排气保护降频 Then determine whether the temperature T is satisfied. 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 If yes, proceed to step S2 to continue controlling the compressor to run at a medium speed (e.g., speed 2) at frequency F2 for time t2, and then execute step 23; otherwise, execute step 38.

[0143] In step 37, if temperature T is satisfied... 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 Although the temperature has risen, it is still within a safe range. However, to prevent the compressor's discharge temperature protection shutdown command from being triggered, the compressor's operating frequency needs to be reduced to a lower setting for reliable operation. The compressor operating frequency should be reduced to level 2 until the indoor temperature reaches the user-set temperature T. 设 Shutdown.

[0144] Step 38: Determine if the compressor discharge temperature T is met. 排气 ≥Temperature T 排气保护停机 If the compressor discharge temperature T is satisfied 排气 ≥Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 The temperature has exceeded the compressor discharge temperature protection shutdown temperature. To prevent the compressor discharge temperature protection shutdown command from being triggered, the compressor must be shut down to ensure system reliability.

[0145] In some implementations, the set temperature range includes: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially. The first temperature range is such as (-∞, temperature ΔT1), the second temperature range is such as [temperature ΔT1, temperature ΔT2), the third temperature range is such as [temperature ΔT2, temperature ΔT3), and the fourth temperature range is such as [temperature ΔT3, +∞). The set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. The first frequency is such as frequency F1, the second frequency is such as frequency F2, the third frequency is such as frequency F3, and the fourth frequency is such as frequency F4. The determination of the compressor's operating frequency based on the indoor temperature difference correction value of the parking air conditioner further includes: determining the compressor's operating frequency when the indoor temperature difference correction value of the parking air conditioner is in a fourth temperature range, specifically as follows: if the indoor temperature difference correction value of the parking air conditioner is determined to be in the fourth temperature range within a set temperature range, then the compressor's operating frequency is determined to be the fourth frequency within the set frequency range, so that the compressor is controlled to run at the fourth frequency for a fourth set duration. Then, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then the compressor is controlled to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then the compressor's operating frequency is controlled according to the compressor's exhaust temperature; wherein, the fourth set duration is, for example, time t4.

[0146] Accordingly, after controlling the compressor to run at the fourth frequency for the fourth set duration, and determining that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, controlling the operating frequency of the compressor according to the exhaust temperature of the compressor further includes: controlling the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the fourth frequency for the fourth set duration.

[0147] The following is combined with Figure 8 The schematic diagram of an embodiment of the method of the present invention, which controls the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the fourth frequency for a fourth set time, further illustrates the specific process of controlling the operating frequency of the compressor according to the exhaust temperature of the compressor after controlling the compressor to run at the fourth frequency for a fourth set time in step S350, including: steps S810 to S840.

[0148] Step S810: If the indoor temperature difference correction value of the parking air conditioner falls within the fourth temperature range of the set temperature range, then after controlling the compressor to run at the fourth frequency for a fourth set duration, determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, determine the relationship between the compressor's exhaust temperature and the preset exhaust protection frequency restriction temperature, the preset exhaust protection frequency reduction temperature, and the preset exhaust protection shutdown temperature. The preset exhaust protection frequency restriction temperature is, for example, temperature T. 排气保护禁频 The preset exhaust protection frequency reduction temperature is such as temperature T. 排气保护降频 The preset exhaust protection shutdown temperature is such as temperature T. 排气保护停机 .

[0149] Step S820: If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, then return to continue controlling the compressor to run at the fourth frequency for the fourth set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then control the operating frequency of the compressor according to the exhaust temperature of the compressor.

[0150] Step S830: If it is determined that the compressor's exhaust temperature is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, then the compressor is controlled to run at the second frequency for a second set duration, i.e., the process jumps to controlling the compressor to run at the second frequency for a second set duration. Then, it is further determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then the compressor is controlled to shut down. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then the operating frequency of the compressor is controlled according to the compressor's exhaust temperature.

[0151] Step S840: If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection shutdown temperature, then the compressor is controlled to shut down.

[0152] Combination Figure 11 , Figure 12 and Figure 13 The example shown is as follows: Figure 14As shown, the flow chart of the compressor operating frequency control method for the parking air conditioner also includes: Step 41, determining whether the temperature ΔT2 ≤ temperature difference correction value ΔT 修 <Temperature ΔT3, when temperature ΔT2 ≤ temperature difference correction value ΔT 修 When the temperature is less than ΔT3, determine whether the temperature difference correction value ΔT is met. 修 ≥Temperature ΔT3: If so, proceed to step 42.

[0153] Step 42, when the temperature difference correction value ΔT is satisfied 修 When the temperature is ≥ ΔT3, execute step S3: control the compressor to run at a high setting (e.g., 4th gear) at a frequency F4 for t4 time, and then execute step 43.

[0154] In step 42, when the temperature difference correction value ΔT is satisfied... 修 When the temperature is ≥ ΔT3, the load in the cab is very high, and the demand for cooling is very large. The first three operating frequencies are no longer sufficient to meet the rapid cooling needs. Therefore, the compressor is controlled to run at a high (4th) frequency F4 for t4 time, and then step 43 is executed.

[0155] Step 43: Determine if the user-set temperature T is met at this time. 设 The indoor ambient temperature T has been reached. 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 44; otherwise, proceed to step 45.

[0156] Step 44: If the user sets the temperature T at this time... 设 If the target has been reached, then control the compressor to stop.

[0157] Step 45: If the user sets the temperature T at this time... 设 The temperature has not yet been reached; check the compressor discharge temperature T at this time. 排气 and the compressor discharge temperature T 排气 Compared with different set values, specifically: determining whether the temperature T is met. 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 If yes, proceed to step 46; otherwise, proceed to step 47.

[0158] Step 46: If temperature T is satisfied 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 Then return to step S4 to continue controlling the compressor to run at a high setting (such as 4th gear) at a frequency of F4 for t4 time, and then execute step 43.

[0159] In step 46, if the user sets the temperature T at this time... 设The temperature has not yet been reached; check the compressor discharge temperature T at this time. 排气 If temperature T is satisfied 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 At this time, the compressor discharge temperature T 排气 Within the normal range, the compressor discharge temperature T 排气 The temperature is not too high, so the compressor discharge temperature protection shutdown command will not be triggered. The compressor will continue to operate at its original frequency. This satisfies the indoor cooling demand, and continuing to operate at a medium-to-high frequency will allow for faster cooling and improve user comfort, until the user's set temperature T is met. 设 The system has reached shutdown.

[0160] Step 47: If temperature T is not met 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 Then determine whether the temperature T is satisfied. 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 If yes, proceed to step S2 to continue controlling the compressor to run at a medium speed (e.g., speed 2) at frequency F2 for time t2, and then execute step 23; otherwise, execute step 48.

[0161] In step 47, if temperature T is satisfied... 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 Although the temperature has risen and is still within a safe range, the compressor's operating frequency needs to be reduced to a lower setting to ensure reliability and prevent the compressor's discharge temperature protection shutdown command from being triggered. This is because the compressor has already been running at a high setting (F4) for t4 hours, and the indoor load is no longer as high as it was initially. Reducing the compressor's operating frequency to level 2 ensures system reliability and allows the indoor ambient temperature to reach the user-set temperature (T). 设 Then the machine was shut down.

[0162] Step 48: Determine if the compressor discharge temperature T is met. 排气 ≥Temperature T 排气保护停机 If the compressor discharge temperature T is satisfied 排气 ≥Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 The temperature has exceeded the compressor discharge temperature protection shutdown temperature. To prevent the compressor discharge temperature protection shutdown command from being triggered, the compressor must be shut down to ensure system reliability.

[0163] In the above embodiments, temperature T 排气保护禁频 <Temperature T 排气保护降频 <Temperature T排气保护停机 The value ranges from 14℃ to 95℃; the compressor discharge temperature T 排气 ≥Temperature T 排气保护停机 This means that the compressor discharge temperature T at this time 排气 The temperature is extremely high, exceeding the compressor's discharge temperature protection shutdown temperature; the compressor must therefore shut down for protection. Temperature ΔT1 < Temperature ΔT2 < Temperature ΔT3 is the preset value of the main control system, and the value is set according to the actual situation. In the solution of this invention, the inlet and outlet temperatures of the parking air conditioner indoor unit are obtained; the absolute value of the difference between the inlet and outlet temperatures and the indoor ambient temperature is calculated; the absolute value of the difference between the inlet and outlet temperatures and the user-set temperature is also calculated; and then, a temperature difference correction value ΔT is calculated based on the absolute value of the temperature difference. 修 Obtain the compressor discharge temperature T 排气 Correction based on temperature difference ΔT 修 and compressor exhaust temperature T 排气 By obtaining the compressor operating frequency F, the compressor operating frequency can be precisely controlled, preventing the compressor frequency from failing to reach the set frequency due to triggering the compressor discharge temperature protection shutdown command. This effectively ensures system reliability while achieving the goals of refrigeration and energy saving.

[0164] The technical solution of this embodiment eliminates the outdoor ambient temperature sensor (i.e., the outer ring temperature sensor) on the outdoor unit side of the parking air conditioner. When the parking air conditioner is running after being turned on, the inlet and outlet temperatures of the indoor unit side are obtained, along with the indoor ambient temperature and the user-set temperature. The compressor exhaust temperature is also obtained. Based on the inlet and outlet temperatures, the indoor ambient temperature, and the user-set temperature, a temperature difference correction value is calculated. Based on the temperature difference correction value within the set temperature range, the compressor is controlled to run at the operating frequency corresponding to that temperature range for a certain period. Afterwards, if... When the indoor ambient temperature reaches the user-set temperature, the compressor is controlled to stop. If the indoor ambient temperature still does not reach the user-set temperature, the compressor operating frequency is adjusted according to the compressor discharge temperature until the indoor ambient temperature reaches the user-set temperature and then stops, or the compressor discharge temperature exceeds the compressor discharge protection shutdown temperature. Thus, by eliminating the outer ring temperature sensor of the parking air conditioner, the compressor operating frequency is controlled according to the inlet temperature, outlet temperature, indoor ambient temperature, and compressor discharge temperature. This not only saves wiring space and costs, but also facilitates the miniaturization design of the parking air conditioner outdoor unit. Furthermore, it ensures reliable compressor operation, making the parking air conditioning system reliable.

[0165] According to an embodiment of the present invention, a control device for a parking air conditioner corresponding to the control method for a parking air conditioner is also provided. See also Figure 9The diagram shows a structural schematic of an embodiment of the device of the present invention. The outdoor unit of the parking air conditioner has a compressor, the indoor unit has an air inlet and an air outlet, and the outdoor unit does not have an outdoor ambient temperature sensor, but it does have a compressor exhaust temperature sensor; in the solution of the present invention, as... Figure 9 As shown, the control device for the parking air conditioner includes: an acquisition unit 102 and a control unit 104.

[0166] The acquisition unit 102 is configured to acquire, when the parking air conditioner is running, the inlet temperature of the parking air conditioner, the outlet temperature of the parking air conditioner, the indoor ambient temperature of the parking air conditioner, the target temperature of the parking air conditioner, and the exhaust temperature of the compressor; wherein, the inlet temperature of the parking air conditioner is, for example, the real-time inlet temperature T. 进 The air outlet temperature of the parking air conditioner is such as the real-time air outlet temperature T. 出 The indoor ambient temperature of the parking air conditioner is as follows: indoor ambient temperature T 内 The target temperature of the parking air conditioner is as set by the user, T. 设 The exhaust temperature of the compressor is like the exhaust temperature T of the parking air conditioning compressor. 排气 The specific functions and processing of the acquisition unit 102 are described in step S110.

[0167] The control unit 104 is configured to determine an indoor temperature difference correction value for the parking air conditioner based on the air inlet temperature, the air outlet temperature, the indoor ambient temperature, and the target temperature of the parking air conditioner; wherein the indoor temperature difference correction value is, for example, a temperature difference correction value ΔT. 修 The specific functions and processing of the control unit 104 are described in step S120.

[0168] The control unit 104 is further configured to control the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner, and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor, so as to adjust the operating frequency of the compressor according to the operating status of the compressor when the parking air conditioner does not have an outdoor ambient temperature sensor, so as to ensure reliable operation of the compressor. The specific functions and processing of this control unit 104 are further described in step S130.

[0169] The solution of this invention, by using the inlet and outlet temperatures of the indoor unit of the parking air conditioner, the indoor ambient temperature, and the set temperature, can determine the compressor's operating status without relying on the outdoor ambient temperature, and precisely control the compressor's operating frequency to ensure system reliability. It also eliminates the need for an external ambient temperature sensor, saving wiring space and costs, and facilitating the miniaturization of the parking air conditioner's outdoor unit. Furthermore, it solves the compressor reliability issues present in related solutions, ensuring reliable operation of the parking air conditioning system.

[0170] In some embodiments, the control unit 104 determines an indoor temperature difference correction value for the parking air conditioner based on the inlet temperature, outlet temperature, indoor ambient temperature, and target temperature of the parking air conditioner, including:

[0171] The control unit 104 is further configured to: determine the absolute value of the difference between the target temperature of the parking air conditioner and the air inlet temperature of the parking air conditioner, denoted as the first air inlet temperature difference; determine the absolute value of the difference between the target temperature of the parking air conditioner and the air outlet temperature of the parking air conditioner, denoted as the first air outlet temperature difference; determine the absolute value of the difference between the indoor ambient temperature of the parking air conditioner and the air inlet temperature of the parking air conditioner, denoted as the second air inlet temperature difference; and determine the absolute value of the difference between the indoor ambient temperature of the parking air conditioner and the air outlet temperature of the parking air conditioner, denoted as the second air outlet temperature difference; wherein, the first air inlet temperature difference is ΔT 进1 The first outlet air temperature difference is ΔT 出1 The second air intake temperature difference is ΔT 进2 The second outlet air temperature difference is as follows: ΔT 出2 For details on the specific functions and processing of the control unit 104, please refer to step S210.

[0172] The control unit 104 is further configured to determine the indoor temperature difference correction value of the parking air conditioner based on the functional relationship between the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference. Based on this correction value, and in conjunction with at least one of the indoor ambient temperature of the parking air conditioner and the compressor's exhaust temperature, the control unit 104 controls the compressor's operating frequency to adjust the compressor's operating frequency according to its operating status when the parking air conditioner lacks an outdoor ambient temperature sensor, thereby ensuring reliable compressor operation. The specific functions and processing of this control unit 104 are further described in step S220.

[0173] The present invention utilizes the functional relationship between the air inlet temperature, air outlet temperature, indoor ambient temperature, and set temperature of the parking air conditioner indoor unit to determine the compressor's operating status without relying on outdoor ambient temperature conditions. This allows for precise control of the compressor's operating frequency, ensuring system reliability and resolving the compressor's operational reliability issues present in related solutions, thus enabling the parking air conditioning system to operate reliably.

[0174] In some embodiments, the control unit 104 determines the indoor temperature difference correction value of the parking air conditioner based on the functional relationship between the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference, including:

[0175] The control unit 104 is further configured to calculate the indoor temperature difference correction value of the parking air conditioner according to the following formula based on the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference:

[0176] ;

[0177] Where, ΔT 修 This represents the indoor temperature difference correction value of the parking air conditioner, ΔT. 进1 This represents the first inlet air temperature difference, ΔT. 出1 This represents the first outlet air temperature difference, ΔT. 进2 This represents the second inlet air temperature difference, ΔT. 出2 This represents the second outlet air temperature difference, and k represents a preset calculation constant.

[0178] Figure 10 This is a schematic diagram of the overall flow of a method for controlling the operating frequency of a parking air conditioner compressor. Figure 10 As shown, the overall flow of the compressor operating frequency control method for the parking air conditioner includes:

[0179] Step 1: The vehicle is equipped with a parking air conditioner, which has an indoor unit and an outdoor unit. A temperature sensor is installed at both the air inlet and outlet of the indoor unit to obtain the real-time air inlet temperature T. 进 and real-time air outlet temperature T 出 And obtain the indoor ambient temperature T of the parking air conditioner. 内 and user-set temperature T 设 Then proceed to step 2.

[0180] Step 2: Calculate the user-set temperature T. 设 With real-time air inlet temperature T 进 and real-time air outlet temperature T 出 The absolute value of the difference ΔT 进1 =|T 设 -T进 |,ΔT 出1 =|T 设 -T 出 Indoor ambient temperature T 内 With real-time air inlet temperature T 进 and real-time air outlet temperature T 出 The absolute value of the difference ΔT 进2 =|T 内 -T 进 |,ΔT 出2 =|T 内 -T 出 Then proceed to step 3.

[0181] Step 3: Calculate the temperature difference correction value ΔT 修 Then proceed to step 4. This involves calculating the temperature difference correction value ΔT. 修 The method is as follows:

[0182] (1).

[0183] The solution of this invention eliminates the external environment temperature sensor of the parking air conditioner outdoor unit, solving the problem of complex wiring of the parking air conditioner outdoor unit, saving wiring space and cost, and enabling the parking air conditioner outdoor unit to be miniaturized; it is beneficial to the miniaturization design of the parking air conditioner outdoor unit and reduce development costs; by using the compressor exhaust temperature, the operating status of the compressor at this time can be determined, and the operating frequency of the compressor can be accurately controlled to ensure system reliability.

[0184] In some embodiments, the control unit 104 controls the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner, and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor, including:

[0185] The control unit 104 is further configured to determine the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner. The specific functions and processing of the control unit 104 are further described in step S310.

[0186] The control unit 104 is further configured to control the compressor to operate at a determined operating frequency for a set time; wherein the set time is, for example, time t. The specific functions and processing of the control unit 104 are further described in step S320.

[0187] The control unit 104 is further configured to, after controlling the compressor to run at the determined operating frequency for a set time, determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. The specific functions and processing of this control unit 104 are further described in step S330.

[0188] The control unit 104 is further configured to control the compressor to stop if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. The specific functions and processing of the control unit 104 are further described in step S340.

[0189] The control unit 104 is further configured to, if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, control the operating frequency of the compressor based on the exhaust temperature of the compressor. The specific functions and processing of this control unit 104 are further described in step S350.

[0190] like Figure 10 As shown, the overall flow of the compressor operating frequency control method for the parking air conditioner also includes:

[0191] Step 4: Adjust the temperature difference correction value ΔT 修 Comparing with different set values, the operating frequency F of the parking air conditioning compressor is determined based on the comparison results, and then step 5 is executed. In step 4, the temperature difference correction value ΔT is used. 修 Determine the indoor temperature load, and then determine the operating frequency F of the parking air conditioning compressor. Different setpoints are set by the control system, equivalent to values ​​already preset in the control program; the temperature difference correction value ΔT is then applied. 修 Compare with different set values ​​to accurately determine the indoor temperature load.

[0192] Step 5: After the compressor runs at the operating frequency F for a time t, the user-set temperature T is detected. 设 Has the indoor ambient temperature T been reached? 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 6; otherwise, proceed to step 7.

[0193] Step 6: If the user sets the temperature T 设 If the target has been reached, the compressor will stop.

[0194] Step 7: If the user sets the temperature T 设 If the temperature is still not reached, then check the compressor discharge temperature T at this time. 排气 and the compressor discharge temperature T 排气 The compressor's operating status is compared with different set values ​​to determine whether the system is operating reliably. Then, step 8 is executed.

[0195] Step 8: Based on the comparison results above, determine the compressor operating frequency F again to ensure system reliability. In step 8, the temperature difference correction value ΔT is used. 修 User-set temperature T 设 With compressor discharge temperature T 排气The compressor operating frequency F is determined to accurately control the operating frequency F of the parking air conditioning compressor and ensure system reliability.

[0196] In some embodiments, the control unit 104 determines the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner, including:

[0197] The control unit 104 is further configured to determine the temperature range within which the indoor temperature difference correction value of the parking air conditioner falls within a set temperature range, denoted as the temperature range within which the indoor temperature difference correction value of the parking air conditioner falls. The specific functions and processing of this control unit 104 are further described in step S410.

[0198] The control unit 104 is further configured to, based on the correspondence between a set temperature range and a set frequency, determine the set frequency corresponding to the set temperature range in which the indoor temperature difference correction value of the parking air conditioner is located, as the operating frequency of the compressor corresponding to the temperature range in which the indoor temperature difference correction value of the parking air conditioner is located, thereby determining the operating frequency of the compressor. Of course, this set frequency is a frequency within the set frequency range. For the specific functions and processing of the control unit 104, please refer to step S420.

[0199] like Figure 10 As shown, the overall flow of the compressor operating frequency control method for the parking air conditioner also includes:

[0200] In step 4, the correction value ΔT is based on the temperature difference. 修 Determine the indoor temperature load, and then determine the operating frequency F of the parking air conditioning compressor. Different setpoints are set by the control system, equivalent to values ​​already preset in the control program; the temperature difference correction value ΔT is then applied. 修 By comparing different set values, the indoor temperature load can be accurately determined, and then the compressor operating frequency can be accurately determined based on the indoor temperature load to ensure system reliability.

[0201] In some implementations, a temperature range is defined, including: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially. The first temperature range is such as (-∞, temperature ΔT1), the second temperature range is such as [temperature ΔT1, temperature ΔT2), the third temperature range is such as [temperature ΔT2, temperature ΔT3), and the fourth temperature range is such as [temperature ΔT3, +∞). A frequency range is defined, including: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. The first frequency is such as frequency F1, the second frequency is such as frequency F2, the third frequency is such as frequency F3, and the fourth frequency is such as frequency F4. The control unit 104 determines the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner. The process of determining the operating frequency of the compressor when the indoor temperature difference correction value of the parking air conditioner is within the first temperature range is as follows:

[0202] The control unit 104 is further configured to, if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within a set temperature range and is in a first temperature range, then determine the operating frequency of the compressor to be a first frequency within a set frequency range, so as to control the compressor to run at the first frequency for a first set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then control the operating frequency of the compressor according to the exhaust temperature of the compressor; wherein, the first set duration is such as time t1.

[0203] Accordingly, after controlling the compressor to run at the first frequency for a first set time, and determining that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, the control unit 104 controls the operating frequency of the compressor based on the exhaust temperature of the compressor. This includes the process of controlling the operating frequency of the compressor based on the exhaust temperature of the compressor after controlling the compressor to run at the first frequency for a first set time, as detailed below:

[0204] The control unit 104 is further configured to, when determining that the indoor temperature difference correction value of the parking air conditioner falls within a set temperature range within a first temperature range, control the compressor to run at the first frequency for a first set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, determine the relationship between the compressor's exhaust temperature and a preset exhaust protection frequency restriction temperature, as well as a preset exhaust protection shutdown temperature; wherein, the preset exhaust protection frequency restriction temperature is, for example, temperature T 排气保护禁频 The preset exhaust protection shutdown temperature is such as temperature T. 排气保护停机 For details on the specific functions and processing of the control unit 104, please refer to step S510.

[0205] The control unit 104 is further configured to, if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection frequency restriction temperature and less than a preset exhaust protection shutdown temperature, return to continue controlling the compressor to run at the first frequency for a first set time, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to shut down; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then control the operating frequency of the compressor according to the compressor's exhaust temperature. The specific functions and processing of this control unit 104 are also described in step S520.

[0206] The control unit 104 is further configured to control the compressor to shut down if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection shutdown temperature. The specific functions and processing of the control unit 104 are further described in step S530.

[0207] Figure 11 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 1 , Figure 12 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 2 , Figure 13 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 3 , Figure 14 A flowchart illustrating a method for controlling the operating frequency of a parking air conditioner compressor. Figure 4 The following is combined with Figure 11 , Figure 12 , Figure 13 and Figure 14The example shown illustrates the specific flow of the compressor operating frequency control method for the parking air conditioner in the present invention. Figure 11 As shown, the flow chart of the compressor operating frequency control method for the parking air conditioner includes: Step 11, determining whether the temperature difference correction value ΔT is met. 修 <Temperature ΔT1: If yes, proceed to step 12. Step 12: When the temperature difference correction value ΔT is satisfied... 修 When the temperature is less than ΔT1, execute step S1: control the compressor to run at a low speed (e.g., speed 1) for time t1, then execute step 13. In step 12, when the temperature difference correction value ΔT is met... 修 When the temperature is less than ΔT1, the load inside the cab is very small. At this time, a large amount of cooling is not needed to maintain the comfort of the cab. Then, the compressor is controlled to run at a low speed (such as speed 1) at a frequency of F1 for t1 time, and then step 13 is executed.

[0208] Step 13: Determine if the user-set temperature T is met at this time. 设 The indoor ambient temperature T has been reached. 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 14; otherwise, proceed to step 15.

[0209] Step 14: If the user sets the temperature T at this time... 设 If the target has been reached, then control the compressor to stop.

[0210] Step 15: If the user sets the temperature T at this time... 设 If the temperature is still not reached, then check the compressor discharge temperature T at this time. 排气 and the compressor discharge temperature T 排气 Compared with different set values, specifically: determining whether the temperature T is met. 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 If yes, proceed to step 16; otherwise, proceed to step 17.

[0211] Step 16: If temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 If so, return to step S1 to continue controlling the compressor to run at a low speed (such as speed 1) at frequency F1 for time t1, and then execute step 13.

[0212] In step 16, if temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 This indicates that the compressor discharge temperature T at this time is... 排气Within the normal range, the compressor can still meet the indoor cooling demand by operating at its original frequency, i.e., at a low setting (such as setting 1) F1, until the user-set temperature T is reached. 设 The machine will shut down once the target temperature is reached.

[0213] Step 17: If temperature T is not met 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 Then determine whether the compressor discharge temperature T is satisfied. 排气 ≥Temperature T 排气保护停机 If so, then control the compressor to stop.

[0214] In step 17, if the compressor discharge temperature T is satisfied... 排气 ≥Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 It has already exceeded the compressor discharge protection shutdown temperature T. 排气保护停机 To prevent the compressor discharge temperature T from being triggered 排气 A protection shutdown command requires the compressor to stop to ensure system reliability. After triggering the compressor discharge temperature protection shutdown command, the compressor stops. Only after a certain period, when the compressor discharge temperature is less than or equal to the compressor discharge protection release temperature, is the entire unit allowed to start operating; otherwise, operation is not permitted. This invention, based on the functional relationship between the inlet and outlet temperatures of the parking air conditioner's indoor unit, the indoor ambient temperature, and the set temperature, as well as the compressor discharge temperature, can precisely control the compressor's operating frequency without relying on external ambient temperature conditions. This prevents the compressor from failing to reach the set frequency due to triggering the compressor discharge temperature protection shutdown command, effectively ensuring system reliability while achieving cooling and energy saving.

[0215] In some implementations, a temperature range is defined, including: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially. The first temperature range is such as (-∞, temperature ΔT1), the second temperature range is such as [temperature ΔT1, temperature ΔT2), the third temperature range is such as [temperature ΔT2, temperature ΔT3), and the fourth temperature range is such as [temperature ΔT3, +∞). A frequency range is defined, including: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. The first frequency is such as frequency F1, the second frequency is such as frequency F2, the third frequency is such as frequency F3, and the fourth frequency is such as frequency F4. The control unit 104 determines the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner. The process of determining the operating frequency of the compressor when the indoor temperature difference correction value of the parking air conditioner is in the second temperature range is as follows:

[0216] The control unit 104 is further configured to, if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within a set temperature range and is located in a second temperature range, determine the operating frequency of the compressor to be a second frequency within a set frequency range, control the compressor to run at the second frequency for a second set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, control the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, control the operating frequency of the compressor according to the exhaust temperature of the compressor; wherein, the second set duration is such as time t2.

[0217] Accordingly, the control unit 104, after controlling the compressor to run at the second frequency for a second set duration, and determining that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, further includes controlling the operating frequency of the compressor based on the exhaust temperature of the compressor, after controlling the compressor to run at the second frequency for a second set duration, the process of controlling the operating frequency of the compressor based on the exhaust temperature of the compressor, as follows:

[0218] The control unit 104 is further configured to, when determining that the indoor temperature difference correction value of the parking air conditioner falls within a set temperature range within a second temperature range, control the compressor to run at the second frequency for a second set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, determine the relationship between the compressor's exhaust temperature and a preset exhaust protection frequency restriction temperature, a preset exhaust protection frequency reduction temperature, and a preset exhaust protection shutdown temperature; wherein, the preset exhaust protection frequency restriction temperature is such as temperature T 排气保护禁频 The preset exhaust protection frequency reduction temperature is such as temperature T. 排气保护降频 The preset exhaust protection shutdown temperature is such as temperature T. 排气保护停机 For details on the specific functions and processing of the control unit 104, please refer to step S610.

[0219] The control unit 104 is further configured to, if it is determined that the exhaust temperature of the compressor is greater than or equal to a preset exhaust protection frequency restriction temperature and less than a preset exhaust protection frequency reduction temperature, return to continue controlling the compressor to run at the second frequency for a second set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then control the operating frequency of the compressor according to the exhaust temperature of the compressor. The specific functions and processing of this control unit 104 are also described in step S620.

[0220] The control unit 104 is further configured to, if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection frequency reduction temperature and less than a preset exhaust protection shutdown temperature, control the compressor to run at the first frequency for a first set duration, i.e., switch to controlling the compressor to run at the first frequency for the first set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, control the compressor to shut down; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, control the operating frequency of the compressor according to the compressor's exhaust temperature. The specific functions and processing of this control unit 104 are also described in step S630.

[0221] The control unit 104 is further configured to control the compressor to shut down if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection shutdown temperature. The specific functions and processing of the control unit 104 are further described in step S640.

[0222] Combination Figure 11 The example shown is as follows: Figure 12 As shown, the flow chart of the compressor operating frequency control method for the parking air conditioner also includes: Step 21, determining whether the temperature difference correction value ΔT is met. 修 <Temperature ΔT1, when the temperature difference correction value ΔT is not met 修 When the temperature is less than ΔT1, determine whether the temperature ΔT1 ≤ temperature difference correction value ΔT 修 <Temperature ΔT2: If so, proceed to step 22. Step 22: When temperature ΔT1 ≤ temperature difference correction value ΔT 修 When the temperature ΔT1 < ΔT2, proceed to step S2: control the compressor to run at a medium speed (e.g., speed 2) for time t2, then proceed to step 23. In step 22, when the temperature ΔT1 ≤ temperature difference correction value ΔT 修<Temperature ΔT2, at this time the load on the cab side is low, the load on the cab side is in the low to medium range, the compressor can meet the cooling demand of the cab by running at the medium level (level 2) frequency F2, there is no need to run at a higher frequency to waste energy, so control the compressor to run at the medium level frequency F2 for t2 time, and then execute step 23.

[0223] Step 23: Determine if the user-set temperature T is met at this time. 设 The indoor ambient temperature T has been reached. 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 24; otherwise, proceed to step 25.

[0224] Step 24: If the user sets the temperature T at this time... 设 If the target has been reached, then control the compressor to stop.

[0225] Step 25: If the user sets the temperature T at this time... 设 The temperature has not yet been reached; check the compressor discharge temperature T at this time. 排气 and the compressor discharge temperature T 排气 Compared with different set values, specifically: determining whether the temperature T is met. 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 If yes, proceed to step 26; otherwise, proceed to step 27.

[0226] Step 26: If temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 If so, return to step S2 to continue controlling the compressor to run at a medium speed (such as speed 2) at a frequency F2 for time t2, and then execute step 23.

[0227] In step 26, if temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 At this time, the compressor discharge temperature T 排气 Within the normal range, the compressor discharge temperature T 排气 The temperature is not too high, so the compressor discharge temperature protection shutdown command will not be triggered. The compressor will continue to operate at its original frequency, i.e., at a low setting (such as setting 2) F2. This satisfies the indoor cooling demand, and continuing to operate at a medium frequency allows for faster cooling and improves user comfort, until the user's set temperature T is met. 设 The system has reached shutdown.

[0228] Step 27: If temperature T is not met 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频Then determine whether the temperature T is satisfied. 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 If yes, proceed to step S1 to continue controlling the compressor to run at a low speed (e.g., speed 1) at frequency F1 for time t1, and then execute step 13; otherwise, execute step 28.

[0229] In step 27, if temperature T is satisfied... 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 Although the temperature has risen, it is still within a safe range. However, to prevent the compressor's discharge temperature protection shutdown command from being triggered, the compressor's operating frequency needs to be reduced to a lower setting for reliable operation. The compressor operating frequency should be reduced to level 1 until the indoor temperature reaches the user-set temperature T. 设 Shutdown.

[0230] Step 28: Determine if the compressor discharge temperature T is met. 排气 ≥Temperature T 排气保护停机 If the compressor discharge temperature T is satisfied 排气 ≥Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 The temperature has exceeded the compressor discharge temperature protection shutdown temperature. To prevent the compressor discharge temperature protection shutdown command from being triggered, the compressor must be shut down to ensure system reliability.

[0231] In some implementations, a temperature range is defined, including: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially. The first temperature range is such as (-∞, temperature ΔT1), the second temperature range is such as [temperature ΔT1, temperature ΔT2), the third temperature range is such as [temperature ΔT2, temperature ΔT3), and the fourth temperature range is such as [temperature ΔT3, +∞). A frequency range is defined, including: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. The first frequency is such as frequency F1, the second frequency is such as frequency F2, the third frequency is such as frequency F3, and the fourth frequency is such as frequency F4. The control unit 104 determines the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner. The process of determining the operating frequency of the compressor when the indoor temperature difference correction value of the parking air conditioner is in the third temperature range is as follows:

[0232] The control unit 104 is further configured to, if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within a third temperature range within a set temperature range, then determine the operating frequency of the compressor to be the third frequency within a set frequency range, and control the compressor to run at the third frequency for a third set duration. Afterwards, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature, the compressor is controlled to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature, the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor. The third set duration is, for example, time t3.

[0233] Accordingly, the control unit 104, after controlling the compressor to run at the third frequency for a third set duration, and determining that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, further includes controlling the operating frequency of the compressor based on the exhaust temperature of the compressor, after controlling the compressor to run at the third frequency for a third set duration, the process of controlling the operating frequency of the compressor based on the exhaust temperature of the compressor, as follows:

[0234] The control unit 104 is further configured to, when determining that the indoor temperature difference correction value of the parking air conditioner falls within a third temperature range within a set temperature range, control the compressor to run at the third frequency for a third set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, determine the relationship between the compressor's exhaust temperature and a preset exhaust protection frequency restriction temperature, a preset exhaust protection frequency reduction temperature, and a preset exhaust protection shutdown temperature; wherein, the preset exhaust protection frequency restriction temperature is, for example, temperature T 排气保护禁频 The preset exhaust protection frequency reduction temperature is such as temperature T. 排气保护降频 The preset exhaust protection shutdown temperature is such as temperature T. 排气保护停机 For details on the specific functions and processing of the control unit 104, please refer to step S710.

[0235] The control unit 104 is further configured to, if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection frequency restriction temperature and less than a preset exhaust protection frequency reduction temperature, return to continue controlling the compressor to run at the third frequency for a third set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then control the operating frequency of the compressor according to the compressor's exhaust temperature. The specific functions and processing of this control unit 104 are also described in step S720.

[0236] The control unit 104 is further configured to, if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection frequency reduction temperature and less than a preset exhaust protection shutdown temperature, control the compressor to run at the second frequency for a second set duration, i.e., switch to controlling the compressor to run at the second frequency for the second set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, control the compressor to shut down; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, control the operating frequency of the compressor according to the compressor's exhaust temperature. The specific functions and processing of this control unit 104 are also described in step S730.

[0237] The control unit 104 is further configured to control the compressor to stop if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection shutdown temperature. The specific functions and processing of the control unit 104 are further described in step S740.

[0238] Combination Figure 11 and Figure 12 The example shown is as follows: Figure 13 As shown, the flow chart of the compressor operating frequency control method for the parking air conditioner also includes: Step 31, determining whether the temperature ΔT1 ≤ temperature difference correction value ΔT 修 <Temperature ΔT2, when temperature ΔT1 ≤ temperature difference correction value ΔT 修 When the temperature is less than ΔT2, determine whether the temperature ΔT2 ≤ temperature difference correction value ΔT 修 <Temperature ΔT3: If so, proceed to step 32. Step 32: When temperature ΔT2 ≤ temperature difference correction value ΔT 修When the temperature ΔT3 is less than the set temperature, proceed to step S3: control the compressor to run at a medium-high setting (e.g., setting 3) at a frequency F3 for a time t3, then proceed to step 33. In step 32, when the temperature ΔT2 ≤ temperature difference correction value ΔT 修 <Temperature ΔT3, at this point the load in the cab is high, in the medium-high range. The demand for cooling is significant, and the first two operating frequencies are insufficient for rapid cooling. Therefore, the compressor is controlled to run at a medium-high (level 3) frequency F3 for t3 time, and then step 33 is executed. Step 33: Determine if the user-set temperature T is met at this time. 设 The indoor ambient temperature T has been reached. 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 34; otherwise, proceed to step 35. Step 34: If the user has set the temperature T... 设 If the desired temperature has been reached, then control the compressor to stop. Step 35: If the user-set temperature T is currently... 设 The temperature has not yet been reached; check the compressor discharge temperature T at this point. 排气 and the compressor discharge temperature T 排气 Compared with different set values, specifically: determining whether the temperature T is met. 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 If yes, proceed to step 36; otherwise, proceed to step 37. Step 36: If temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 Then return to step S3 to continue controlling the compressor to run at a medium-high setting (e.g., level 3) at frequency F3 for time t3, and then execute step 33. In step 36, if the user sets the temperature T at this time... 设 The temperature has not yet been reached; check the compressor discharge temperature T at this point. 排气 If temperature T is satisfied 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 At this time, the compressor discharge temperature T 排气 Within the normal range, the compressor discharge temperature T 排气 The temperature is not too high, so the compressor discharge temperature protection shutdown command will not be triggered. The compressor will continue to operate at its original frequency. This satisfies the indoor cooling demand, and continuing to operate at a medium-to-high frequency will allow for faster cooling and improve user comfort, until the user's set temperature T is met. 设 The machine reaches shutdown. Step 37: If temperature T is not met... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 Then determine whether the temperature T is satisfied. 排气保护降频 ≤ Compressor discharge temperature T 排气<Temperature T 排气保护停机 If so, proceed to step S2 to continue controlling the compressor to run at a medium speed (e.g., speed 2) at frequency F2 for time t2, then execute step 23; otherwise, execute step 38. In step 37, if temperature T is satisfied... 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 Although the temperature has risen, it is still within a safe range. However, to prevent the compressor's discharge temperature protection shutdown command from being triggered, the compressor's operating frequency needs to be reduced to a lower setting for reliable operation. The compressor operating frequency should be reduced to level 2 until the indoor temperature reaches the user-set temperature T. 设 Shut down the machine. Step 38: Determine if the compressor discharge temperature T is met. 排气 ≥Temperature T 排气保护停机 If the compressor discharge temperature T is satisfied 排气 ≥Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 The temperature has exceeded the compressor discharge temperature protection shutdown temperature. To prevent the compressor discharge temperature protection shutdown command from being triggered, the compressor must be shut down to ensure system reliability.

[0239] In some implementations, a temperature range is defined, including: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially. The first temperature range is such as (-∞, temperature ΔT1), the second temperature range is such as [temperature ΔT1, temperature ΔT2), the third temperature range is such as [temperature ΔT2, temperature ΔT3), and the fourth temperature range is such as [temperature ΔT3, +∞). A frequency range is defined, including: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. The first frequency is such as frequency F1, the second frequency is such as frequency F2, the third frequency is such as frequency F3, and the fourth frequency is such as frequency F4. The control unit 104 determines the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner. The process of determining the operating frequency of the compressor when the indoor temperature difference correction value of the parking air conditioner is in the fourth temperature range is as follows:

[0240] The control unit 104 is further configured to, if it is determined that the indoor temperature difference correction value of the parking air conditioner falls within a fourth temperature range within a set temperature range, then determine that the operating frequency of the compressor is the fourth frequency within a set frequency range, and control the compressor to run at the fourth frequency for a fourth set duration. Then, it determines whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, it controls the compressor to stop. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, it controls the operating frequency of the compressor according to the exhaust temperature of the compressor. The fourth set duration is, for example, time t4.

[0241] Accordingly, after controlling the compressor to run at the fourth frequency for a fourth set duration, and determining that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, the control unit 104, based on the exhaust temperature of the compressor, controls the operating frequency of the compressor, further includes: the process of controlling the operating frequency of the compressor based on the exhaust temperature of the compressor after controlling the compressor to run at the fourth frequency for a fourth set duration, as detailed below:

[0242] The control unit 104 is further configured to, when determining that the indoor temperature difference correction value of the parking air conditioner falls within the fourth temperature range within the set temperature range, control the compressor to run at the fourth frequency for a fourth set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, determine the relationship between the compressor's exhaust temperature and a preset exhaust protection frequency restriction temperature, a preset exhaust protection frequency reduction temperature, and a preset exhaust protection shutdown temperature; wherein, the preset exhaust protection frequency restriction temperature is such as temperature T 排气保护禁频 The preset exhaust protection frequency reduction temperature is such as temperature T. 排气保护降频 The preset exhaust protection shutdown temperature is such as temperature T. 排气保护停机 For details on the specific functions and processing of the control unit 104, please refer to step S810.

[0243] The control unit 104 is further configured to, if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection frequency restriction temperature and less than a preset exhaust protection frequency reduction temperature, return to continue controlling the compressor to run at the fourth frequency for a fourth set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then control the compressor to stop; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, then control the operating frequency of the compressor according to the compressor's exhaust temperature. The specific functions and processing of this control unit 104 are also described in step S820.

[0244] The control unit 104 is further configured to, if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection frequency reduction temperature and less than a preset exhaust protection shutdown temperature, control the compressor to run at the second frequency for a second set duration, i.e., switch to controlling the compressor to run at the second frequency for the second set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; if it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, control the compressor to shut down; if it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, control the operating frequency of the compressor according to the compressor's exhaust temperature. The specific functions and processing of this control unit 104 are also described in step S830.

[0245] The control unit 104 is further configured to control the compressor to shut down if it is determined that the compressor's exhaust temperature is greater than or equal to a preset exhaust protection shutdown temperature. The specific functions and processing of this control unit 104 are further described in step S840.

[0246] Combination Figure 11 , Figure 12 and Figure 13 The example shown is as follows: Figure 14 As shown, the flow chart of the compressor operating frequency control method for the parking air conditioner also includes: Step 41, determining whether the temperature ΔT2 ≤ temperature difference correction value ΔT 修 <Temperature ΔT3, when temperature ΔT2 ≤ temperature difference correction value ΔT 修 When the temperature is less than ΔT3, determine whether the temperature difference correction value ΔT is met. 修 ≥Temperature ΔT3: If so, proceed to step 42. Step 42: When the temperature difference correction value ΔT is satisfied... 修When the temperature is ≥ ΔT3, execute step S3: control the compressor to run at a high setting (e.g., level 4) at frequency F4 for time t4, then execute step 43. In step 42, when the temperature difference correction value ΔT is met... 修 When the temperature ≥ ΔT3, the load inside the cab is very high, and the demand for cooling is extremely large. The first three operating frequencies are insufficient for rapid cooling. Therefore, the compressor is controlled to run at a high frequency (4th gear) F4 for t4 seconds, after which step 43 is executed. Step 43: Determine if the user-set temperature T is met at this time. 设 The indoor ambient temperature T has been reached. 内 Has the user-set temperature T been reached? 设 If yes, proceed to step 44; otherwise, proceed to step 45. Step 44: If the user has set the temperature T... 设 If the desired temperature has been reached, then control the compressor to stop. Step 45: If the user-set temperature T is currently... 设 The temperature has not yet been reached; check the compressor discharge temperature T at this time. 排气 and the compressor discharge temperature T 排气 Compared with different set values, specifically: determining whether the temperature T is met. 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 If yes, proceed to step 46; otherwise, proceed to step 47. Step 46: If temperature T is satisfied... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 Then return to step S4 to continue controlling the compressor to run at a high setting (e.g., level 4) at frequency F4 for t4 time, and then execute step 43. In step 46, if the user sets the temperature T at this time... 设 The temperature has not yet been reached; check the compressor discharge temperature T at this time. 排气 If temperature T is satisfied 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 At this time, the compressor discharge temperature T 排气 Within the normal range, the compressor discharge temperature T 排气 The temperature is not too high, so the compressor discharge temperature protection shutdown command will not be triggered. The compressor will continue to operate at its original frequency. This satisfies the indoor cooling demand, and continuing to operate at a medium-to-high frequency will allow for faster cooling and improve user comfort, until the user's set temperature T is met. 设 The machine reaches shutdown. Step 47: If temperature T is not met... 排气保护禁频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护降频 Then determine whether the temperature T is satisfied. 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T排气保护停机 If so, proceed to step S2 to continue controlling the compressor to run at a medium speed (e.g., speed 2) at frequency F2 for time t2, then execute step 23; otherwise, execute step 48. In step 47, if temperature T is satisfied... 排气保护降频 ≤ Compressor discharge temperature T 排气 <Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 Although the temperature has risen and is still within a safe range, the compressor's operating frequency needs to be reduced to a lower setting to ensure reliability and prevent the compressor's discharge temperature protection shutdown command from being triggered. This is because the compressor has already been running at a high setting (F4) for t4 hours, and the indoor load is no longer as high as it was initially. Reducing the compressor's operating frequency to level 2 ensures system reliability and allows the indoor ambient temperature to reach the user-set temperature (T). 设 Then stop the machine. Step 48: Determine if the compressor discharge temperature T is met. 排气 ≥Temperature T 排气保护停机 If the compressor discharge temperature T is satisfied 排气 ≥Temperature T 排气保护停机 At this time, the compressor discharge temperature T 排气 The temperature has exceeded the compressor discharge temperature protection shutdown temperature. To prevent the compressor discharge temperature protection shutdown command from being triggered, the compressor must be shut down to ensure system reliability.

[0247] In the above embodiments, temperature T 排气保护禁频 <Temperature T 排气保护降频 <Temperature T 排气保护停机 The value ranges from 14℃ to 95℃; the compressor discharge temperature T 排气 ≥Temperature T 排气保护停机 This means that the compressor discharge temperature T at this time 排气 Extremely high, exceeding the compressor's discharge temperature protection shutdown temperature; the compressor must shut down for protection. Temperature ΔT1 < Temperature ΔT2 < Temperature ΔT3, these are preset values ​​for the main control system, and the values ​​should be set according to actual conditions.

[0248] In the solution of this invention, the inlet and outlet temperatures of the parking air conditioner indoor unit are obtained; the absolute values ​​of the differences between the inlet and outlet temperatures and the indoor ambient temperature are calculated; the absolute values ​​of the differences between the inlet and outlet temperatures and the user-set temperature are also calculated; and then a temperature difference correction value ΔT is calculated based on the absolute values ​​of the temperature differences. 修 Obtain the compressor discharge temperature T 排气 Correction based on temperature difference ΔT 修 and compressor exhaust temperature T 排气The compressor operating frequency F is obtained, and the compressor operating frequency is precisely controlled to prevent the compressor frequency from failing to reach the set frequency due to triggering the compressor discharge temperature protection shutdown command. This effectively ensures system reliability while achieving the goals of refrigeration and energy saving. Since the processing and functions implemented by the device in this embodiment basically correspond to the embodiments, principles, and examples of the aforementioned methods, any details not elaborated in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0249] According to an embodiment of the present invention, a parking air conditioner corresponding to a control device for a parking air conditioner is also provided. This parking air conditioner may include the control device for the parking air conditioner described above. Since the processing and functions implemented by the parking air conditioner in this embodiment are basically corresponding to the embodiments, principles, and examples of the aforementioned devices, any details not elaborated in the description of this embodiment can be found in the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0250] According to an embodiment of the present invention, a computer program product corresponding to the control method for a parking air conditioner is also provided, comprising a computer program that, when executed by a processor, implements the steps of the above-described control method for a parking air conditioner. Since the processing and functions implemented by the product of this embodiment are basically corresponding to the embodiments, principles, and examples of the foregoing method, any details not fully described in this embodiment can be found in the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0251] According to an embodiment of the present invention, a storage medium corresponding to a control method for a parking air conditioner is also provided. The storage medium includes a stored program, wherein, when the program is executed, the device where the storage medium is located executes the steps of the above-described control method for a parking air conditioner. Since the processing and functions implemented by the storage medium in this embodiment are basically corresponding to the embodiments, principles, and examples of the aforementioned method, any details not described in this embodiment can be found in the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0252] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0253] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for controlling a parking air conditioner, characterized in that, The outdoor unit of the parking air conditioner has a compressor, the indoor unit of the parking air conditioner has an air inlet and an air outlet, and the outdoor unit of the parking air conditioner does not have an outdoor ambient temperature sensor. The method for controlling the parking air conditioner includes: When the parking air conditioner is running, the air inlet temperature of the parking air conditioner, the air outlet temperature of the parking air conditioner, the indoor ambient temperature of the parking air conditioner, the target temperature of the parking air conditioner, and the exhaust temperature of the compressor are obtained. Based on the inlet temperature, outlet temperature, indoor ambient temperature, and target temperature of the parking air conditioner, the indoor temperature difference correction value of the parking air conditioner is determined, including: determining the absolute value of the difference between the target temperature and the inlet temperature of the parking air conditioner, denoted as the first inlet temperature difference; determining the absolute value of the difference between the target temperature and the outlet temperature of the parking air conditioner, denoted as the first outlet temperature difference; determining the absolute value of the difference between the indoor ambient temperature and the inlet temperature of the parking air conditioner, denoted as the second inlet temperature difference; and determining the absolute value of the difference between the indoor ambient temperature and the outlet temperature of the parking air conditioner, denoted as the second outlet temperature difference; and determining the indoor temperature difference correction value of the parking air conditioner based on the functional relationship between the first inlet temperature difference, the first outlet temperature difference, the second inlet temperature difference, and the second outlet temperature difference. The operating frequency of the compressor is controlled based on the indoor temperature difference correction value of the parking air conditioner and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor.

2. The control method for a parking air conditioner according to claim 1, characterized in that, Based on the functional relationship between the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference, the indoor temperature difference correction value of the parking air conditioner is determined, including: Based on the first inlet air temperature difference, the first outlet air temperature difference, the second inlet air temperature difference, and the second outlet air temperature difference, the indoor temperature difference correction value of the parking air conditioner is calculated according to the following formula: ； Where, ΔT 修 This represents the indoor temperature difference correction value of the parking air conditioner, ΔT. 进1 This represents the first inlet air temperature difference, ΔT. 出1 This represents the first outlet air temperature difference, ΔT. 进2 This represents the second inlet air temperature difference, ΔT. 出2 This indicates the second outlet air temperature difference. k This represents the preset calculation constant.

3. The control method for a parking air conditioner according to claim 1 or 2, characterized in that, Based on the indoor temperature difference correction value of the parking air conditioner, and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor, the operating frequency of the compressor is controlled, including: The operating frequency of the compressor is determined based on the indoor temperature difference correction value of the parking air conditioner. Control the compressor to run at the determined operating frequency for a set time; Determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner; If it is determined that the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner, then the compressor is controlled to stop. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, the operating frequency of the compressor is controlled according to the exhaust temperature of the compressor.

4. The control method for a parking air conditioner according to claim 3, characterized in that, Based on the indoor temperature difference correction value of the parking air conditioner, the operating frequency of the compressor is determined, including: The temperature range within which the indoor temperature difference correction value of the parking air conditioner falls within the set temperature range is determined and denoted as the temperature range within which the indoor temperature difference correction value of the parking air conditioner falls. Based on the correspondence between the set temperature range and the set frequency, the set frequency corresponding to the set temperature range that is the same as the temperature range where the indoor temperature difference correction value of the parking air conditioner is located is determined as the operating frequency of the compressor corresponding to the temperature range where the indoor temperature difference correction value of the parking air conditioner is located, so as to obtain the operating frequency of the compressor.

5. The control method for a parking air conditioner according to claim 3 or 4, characterized in that, in, The set temperature range includes: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. Determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner also includes: If the indoor temperature difference correction value of the parking air conditioner is determined to be within the temperature range of the set temperature range as the first temperature range, then the operating frequency of the compressor is determined to be the first frequency within the set frequency range, so as to control the compressor to run at the first frequency for a first set duration. Accordingly, controlling the operating frequency of the compressor based on the compressor's discharge temperature includes: If the indoor temperature difference correction value of the parking air conditioner falls within the set temperature range and is determined to be the first temperature range, the compressor is controlled to run at the first frequency for a first set time. Then, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, the relationship between the exhaust temperature of the compressor and the preset exhaust protection frequency restriction temperature and the preset exhaust protection shutdown temperature is determined. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection shutdown temperature, then return to continue controlling the compressor to run at the first frequency for a first set time, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection shutdown temperature, then the compressor is controlled to shut down.

6. The control method for a parking air conditioner according to claim 3 or 4, characterized in that, in, The set temperature range includes: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. Determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner also includes: If it is determined that the indoor temperature difference correction value of the parking air conditioner falls within the second temperature range within the set temperature range, then the operating frequency of the compressor is determined to be the second frequency within the set frequency range, so as to control the compressor to run at the second frequency for a second set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. Accordingly, controlling the operating frequency of the compressor based on the compressor's discharge temperature further includes: If the indoor temperature difference correction value of the parking air conditioner falls within the set temperature range and is located in the second temperature range, the compressor is controlled to run at the second frequency for a second set duration. Then, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, the relationship between the compressor's exhaust temperature and the preset exhaust protection frequency restriction temperature, the preset exhaust protection frequency reduction temperature, and the preset exhaust protection shutdown temperature is determined. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, then return to continue controlling the compressor to run at the second frequency for the second set time, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, then the compressor is controlled to run at the first frequency for a first set time, and then it is further determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection shutdown temperature, then the compressor is controlled to shut down.

7. The control method for a parking air conditioner according to claim 3 or 4, characterized in that, in, The set temperature range includes: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. Determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner also includes: If it is determined that the indoor temperature difference correction value of the parking air conditioner is in the third temperature range within the set temperature range, then the operating frequency of the compressor is determined to be the third frequency within the set frequency range, so as to control the compressor to run at the third frequency for a third set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. Accordingly, controlling the operating frequency of the compressor based on the compressor's discharge temperature further includes: If the indoor temperature difference correction value of the parking air conditioner is determined to be in the third temperature range within the set temperature range, the compressor is controlled to run at the third frequency for a third set duration. Then, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, the relationship between the exhaust temperature of the compressor and the preset exhaust protection frequency restriction temperature, the preset exhaust protection frequency reduction temperature, and the preset exhaust protection shutdown temperature is determined. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, then return to continue controlling the compressor to run at the third frequency for the third set time, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, then the compressor is controlled to run at the second frequency for a second set duration, and then it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection shutdown temperature, then the compressor is controlled to shut down.

8. The control method for a parking air conditioner according to claim 3 or 4, characterized in that, in, The set temperature range includes: a first temperature range, a second temperature range, a third temperature range, and a fourth temperature range where the temperature values ​​increase sequentially; the set frequency range includes: a first frequency, a second frequency, a third frequency, and a fourth frequency where the frequency values ​​increase sequentially. Determining the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner also includes: If it is determined that the indoor temperature difference correction value of the parking air conditioner is in the fourth temperature range within the set temperature range, then the operating frequency of the compressor is determined to be the fourth frequency within the set frequency range, so as to control the compressor to run at the fourth frequency for a fourth set duration, and then determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. Accordingly, controlling the operating frequency of the compressor based on the compressor's discharge temperature further includes: If the indoor temperature difference correction value of the parking air conditioner is determined to be in the fourth temperature range within the set temperature range, the compressor is controlled to run at the fourth frequency for the fourth set duration. Then, it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the indoor ambient temperature of the parking air conditioner has not yet reached the target temperature of the parking air conditioner, the relationship between the exhaust temperature of the compressor and the preset exhaust protection frequency restriction temperature, the preset exhaust protection frequency reduction temperature, and the preset exhaust protection shutdown temperature is determined. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection frequency restriction temperature and less than the preset exhaust protection frequency reduction temperature, then return to continue controlling the compressor to run at the fourth frequency for the fourth set duration, and then continue to determine whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection frequency reduction temperature and less than the preset exhaust protection shutdown temperature, then the compressor is controlled to run at the second frequency for a second set duration, and then it is determined whether the indoor ambient temperature of the parking air conditioner has reached the target temperature of the parking air conditioner. If it is determined that the exhaust temperature of the compressor is greater than or equal to the preset exhaust protection shutdown temperature, then the compressor is controlled to shut down.

9. A control device for a parking air conditioner, wherein the control is performed using the parking air conditioner control method as described in any one of claims 1 to 8, characterized in that, The outdoor unit of the parking air conditioner has a compressor, the indoor unit of the parking air conditioner has an air inlet and an air outlet, and the outdoor unit of the parking air conditioner does not have an outdoor ambient temperature sensor. The control device for the parking air conditioner includes: The acquisition unit is configured to acquire the air inlet temperature of the parking air conditioner, the air outlet temperature of the parking air conditioner, the indoor ambient temperature of the parking air conditioner, the target temperature of the parking air conditioner, and the exhaust temperature of the compressor when the parking air conditioner is running. The control unit is configured to determine the indoor temperature difference correction value of the parking air conditioner based on the air inlet temperature of the parking air conditioner, the air outlet temperature of the parking air conditioner, the indoor ambient temperature of the parking air conditioner, and the target temperature of the parking air conditioner. The control unit is further configured to control the operating frequency of the compressor based on the indoor temperature difference correction value of the parking air conditioner and in combination with at least one of the indoor ambient temperature of the parking air conditioner and the exhaust temperature of the compressor.

10. A parking air conditioner, characterized in that, include: The parking air conditioning control device as described in claim 9.

11. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the control method for the parking air conditioner as described in any one of claims 1 to 8.

12. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the parking air conditioner control method according to any one of claims 1 to 8.

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