Control Method, Controller and Parking Air Conditioner for Parking Air Conditioner

Abstract

The present invention relates to a control method, a controller and a parking air conditioner for a parking air conditioner. By obtaining the voltage change state of a battery that powers the parking air conditioner when the compressor of the parking air conditioner is turned on, and determining the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state, the operating frequency of the compressor of the parking air conditioner is controlled according to the operating state of the engine. Thereby, when the battery powers the air conditioner, it will not be over-discharged to cause damage to the battery life due to power shortage, and when the engine is running, the refrigeration capacity of the parking air conditioner is increased as much as possible to achieve a rapid cooling effect.

Description

Technical Field

[0001] The present invention relates to a control method, a controller and a parked vehicle air conditioner, and belongs to the technical application field of parked vehicle air conditioner control. Background Art

[0002] Parked vehicle air conditioners are widely used in vehicles such as trucks and RVs that use vehicle-mounted batteries. When the vehicle engine is running, it drives the generator to generate electricity to supply power to the parked vehicle air conditioner. When the engine stops, it relies on the battery for power supply. Since the parked vehicle air conditioner consumes a relatively high current and the battery capacity of the battery is limited, the power supply current of the battery to the vehicle-mounted air conditioner cannot be too high, thus limiting the refrigeration effect of the vehicle-mounted air conditioner. How to specifically control the operating state of the parked vehicle air conditioner so as to simultaneously take into account the refrigeration effect of the air conditioner and meet the requirements of the output current limit of the battery, so that it does not discharge excessively and cause power shortage, is a problem that needs to be solved. Summary of the Invention

[0003] The present invention aims at the problem that the existing parked vehicle air conditioner cannot better control its operating state, so as to simultaneously take into account the refrigeration demand of the air conditioner and the battery discharge capacity demand.

[0004] Specifically, the present invention discloses a control method for a parked vehicle air conditioner, and the control method includes:

[0005] Obtain the voltage change state of the battery that supplies power to the parked vehicle air conditioner when the compressor of the parked vehicle air conditioner is turned on;

[0006] Determine the operating state of the engine of the vehicle where the parked vehicle air conditioner is located according to the voltage change state;

[0007] Control the operating frequency of the compressor of the parked vehicle air conditioner according to the operating state of the engine.

[0008] Optionally, obtaining the voltage change state of the battery that supplies power to the parked vehicle air conditioner includes:

[0009] Obtain the voltage drop amplitude of the battery;

[0010] Determining the operating state of the engine of the vehicle where the parked vehicle air conditioner is located according to the voltage change state includes:

[0011] When the voltage drop amplitude of the battery is lower than the preset amplitude, determine that the engine is in the on state; otherwise, the engine is in the off state.

[0012] Optionally, the control method further includes:

[0013] Determine the capacity of the battery;

[0014] Correct the preset amplitude according to the capacity.

[0015] Optionally, obtaining the voltage change state of the battery that powers the parking air conditioner includes:

[0016] Obtaining the rate of decrease of the voltage of the battery;

[0017] Determining the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state includes:

[0018] When the rate of decrease of the voltage of the battery is lower than a preset rate, it is determined that the engine is in the on state; otherwise, the engine is in the off state.

[0019] Optionally, the control method further includes:

[0020] Determining the capacity of the battery;

[0021] Correcting the preset rate according to the capacity.

[0022] Optionally, controlling the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine includes:

[0023] When the engine is in the on state, controlling the compressor to start at a preset high frequency increase rate for a first preset time;

[0024] Controlling the compressor to increase the frequency by a preset frequency at the current frequency;

[0025] When the engine is in the off state, controlling the compressor to start at a preset low frequency increase rate for a second preset time;

[0026] Wherein the second preset time is greater than the first preset time.

[0027] Optionally, the control method further includes:

[0028] Determining the capacity of the battery;

[0029] When the engine is in the off state, controlling the operating frequency and operating time of the compressor according to the capacity to prevent the battery from discharging too low and causing power shortage.

[0030] Optionally, determining the capacity of the battery includes:

[0031] When the engine is in the off state, controlling the operating frequency of the compressor so that the operating current of the compressor stabilizes at a preset current value and maintaining the compressor operation for a third preset time;

[0032] Obtaining the voltage drop amplitude of the battery within the third preset time;

[0033] Estimating the capacity of the battery according to the voltage drop amplitude.

[0034] The present invention also provides a controller for a parking air conditioner. The controller is powered by a battery of the parking air conditioner and is connected to a compressor to control the operating frequency of the compressor. The controller is configured to:

[0035] Obtain the voltage change state of the battery that powers the parking air conditioner when the compressor is turned on during parking;

[0036] Determine the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state;

[0037] Control the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine.

[0038] The present invention also provides a parking air conditioner, which is internally provided with the above-mentioned controller for the parking air conditioner.

[0039] The control method for the parking air conditioner of the present invention obtains the voltage change state of the battery that powers the parking air conditioner when the compressor of the parking air conditioner is turned on, and determines the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state, so as to control the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine. Thus, when the battery is powered, it will not be over-discharged to cause damage to the battery life, and when the engine is running, the refrigeration capacity of the parking air conditioner will be increased as much as possible to achieve a rapid cooling effect. Description of the Drawings

[0040] Figure 1 It is a flowchart of the control method for the parking air conditioner according to an embodiment of the present invention;

[0041] Figure 2 It is a flowchart of the control method for the parking air conditioner according to another embodiment of the present invention;

[0042] Figure 3 It is a flowchart for determining the size of the battery capacity in the embodiment of the control method for the parking air conditioner of the present invention;

[0043] Figure 4 It is a curve graph showing the change of the starting frequency of the compressor of the parking air conditioner in the embodiment of the present invention when the engine is started and stopped;

[0044] Figure 5 It is a simplified block diagram of the controller for the parking air conditioner according to an embodiment of the present invention. Detailed Description of the Embodiment

[0045] The following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and illustrating the present invention, and are not used to limit the present invention.

[0046] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0047] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The present invention provides a control method for a parking air conditioner, as Figure 1 shown, the control method includes the following steps:

[0049] S100. Obtain the voltage change state of the battery that powers the parking air conditioner when the compressor of the parking air conditioner is turned on;

[0050] S200. Determine the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state;

[0051] S300. Control the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine.

[0052] Among them, in steps S100 and S200, the operation of the parking air conditioner is directly powered by the battery with direct current. When the compressor of the parking air conditioner starts, it needs to consume a large amount of current, such as exceeding 30A, which will cause the battery voltage to drop. After the vehicle engine starts, it drives the generator to charge the battery at the same time. At this time, the operating current of the parking air conditioner is provided by the generator, and its voltage will also drop, but it is significantly different from the voltage drop change situation when the generator stops supplying power to the battery. Therefore, by detecting the change characteristics of the battery voltage, the operating state of the engine can be determined, such as whether the engine is stopped or started, and even further, the rotational speed state of the engine at this time can be identified, because at high rotational speeds, the generated voltage of the generator is also high, and the voltage loaded on the battery also correspondingly increases. Therefore, the change can be identified through the change of the voltage value.

[0053] In step S300, when the operating state of the engine is recognized as starting or stopping, the corresponding operating frequency of the compressor can be controlled. If the engine is stopped, the operating frequency of the compressor can be controlled to decrease correspondingly, so as to control the consumption current of the compressor below the battery power supply current limit value and avoid excessive discharge of the battery. If the engine is running, the operating frequency of the compressor can be controlled to increase, thereby increasing the refrigeration capacity of the parking air conditioner and enabling the space where the vehicle is located to cool down rapidly. Further, according to the different output voltages of the generator driven by the engine speed when the engine is running, the specific frequency values of the high operating frequency of the compressor can be controlled, so as to fully match the power supply voltage and the operating frequency of the compressor, and further achieve a rapid cooling effect.

[0054] Therefore, for the control method of the parking air conditioner in this application, by identifying the operating state of the engine according to the voltage change of the battery, and then controlling the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine, the battery will not be over-discharged to damage its life when powered by the battery, and the refrigeration capacity of the parking air conditioner is increased as much as possible when the engine is running, so as to achieve a rapid cooling effect.

[0055] There are various implementation manners for the voltage change state of the battery in the above embodiment and determining the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state.

[0056] In one implementation manner, obtaining the voltage change state of the battery that powers the parking air conditioner includes: obtaining the decrease amplitude of the battery voltage. Determining the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state includes: when the decrease amplitude of the battery voltage is lower than a preset amplitude, determining that the engine is in the on state; otherwise, the engine is in the off state. The range of the decrease amplitude of the battery voltage is preferably 0.3V to 1V. For example, preferably 0.7V. When it is detected that the battery voltage drop exceeds 0.7V, it can be determined that the engine is in the shutdown state at this time. If it is lower than 0.7V, it is determined that the engine is in the start state.

[0057] In another implementable manner, obtaining the voltage change state of the battery that powers the parking air conditioner includes: obtaining the rate of decrease of the voltage of the battery. Determining the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state includes: when the rate of decrease of the voltage of the battery is lower than a preset rate, determining that the engine is in the on state; otherwise, the engine is in the off state. The range of the rate of decrease of the voltage of the battery is preferably from 0.02 V / minute to 0.1 V / minute, such as preferably 0.05 V / minute. If it is detected that the rate of decrease of the battery voltage is lower than 0.05 V / minute, it is determined that the engine is in the start state; if it is detected that the rate of decrease of the battery voltage exceeds 0.05 V / minute, it is determined that the engine is in the shutdown state.

[0058] Further, in some embodiments of the present application, as Figure 2 shown, the above control method further includes:

[0059] S400. Determine the capacity of the battery;

[0060] S500. Modify the preset amplitude or preset rate according to the capacity of the battery.

[0061] In the above embodiments, when obtaining the voltage change state of the battery, the actual capacity of the battery is not considered. The data is obtained by testing the battery in a state that is normally close to the nominal capacity. As the actual battery is used, its capacity will decrease, its internal resistance will increase, and the magnitude of the discharge current will also change accordingly. Therefore, the reference data for judging the voltage change of the battery in the above embodiments should also be corrected accordingly, specifically, the preset amplitude or preset rate mentioned in the above embodiments should be corrected to make the result of judging the operating state of the engine more accurate.

[0062] Specifically, in order to detect the capacity of the battery, as an implementable solution, as Figure 3 shown, determining the capacity of the battery includes:

[0063] S410. When the engine is in the off state, control the operating frequency of the compressor so that the operating current of the compressor is stabilized at a preset current value, and maintain the operation of the compressor for a third preset time;

[0064] S420. Obtain the voltage drop amplitude of the battery within the third preset time;

[0065] S430. Estimate the capacity of the battery according to the voltage drop amplitude.

[0066] In this embodiment, when it is determined that the engine is in a stopped state, the operation of the compressor can be controlled for a third preset time, such as 30 seconds to 1 minute. The compressor operates at a relatively low frequency, such as 50 Hz, so that the working current of the compressor is maintained at a relatively low value, such as about 10 A. During the process of controlling the operation of the compressor, since the commanded operating conditions of the air conditioner will change and the load of its compressor also changes accordingly, if the compressor is controlled to operate at a constant frequency, its working current will also change. In order to stabilize the working current of the compressor at a preset current value, such as near 10 A, the operating frequency of the compressor can be adjusted in real time to stabilize its working current. At the same time, the change of the battery voltage is detected in real time. After the compressor has operated for the third preset time, the amplitude of the battery voltage drop is obtained. Thus, the size of the current battery capacity can be simply estimated according to the amplitude of the battery voltage drop. A larger-capacity battery will have a relatively smaller voltage drop amplitude, and vice versa, a relatively larger voltage drop amplitude.

[0067] The scheme for determining the battery capacity in the above embodiment requires controlling the compressor to operate at a specific working current, which may not conform to the operating state of the parking air conditioner, resulting in the cooling capacity of the parking air conditioner not meeting the user's needs during the third preset period of the compressor's operation. To solve this problem, in the current operating state of the parking air conditioner, during the third preset time, the operating current and voltage of the compressor are detected in real time, and thus the power consumption of the compressor is calculated in real time. Then, based on a series of power consumption values of the compressor during this time, the power consumption of the compressor is calculated, and the size of the battery capacity is estimated according to the size of the power consumption. This scheme will not interfere with the current operating state of the parking air conditioner, but the process of calculating the power consumption is relatively complex because the power of the compressor changes during operation. Therefore, it is necessary to detect its power consumption in real time and accumulate the power consumption corresponding to each different power consumption to obtain the total power consumption during this time period, which is similar to an integration calculation process.

[0068] The above-mentioned execution process of determining the capacity of the storage battery can be continuously carried out at fixed intervals, such as detecting once every 10 - 15 days, and storing the detection results of each time in the storage chip of the controller, such as the EEPROM chip, so as to compare with the capacity data of the previous several times, thereby more accurately correcting the above-mentioned preset amplitude or preset rate. Specifically, when correcting the preset amplitude or preset rate, it can be fine-tuned according to the comparison between the capacity result detected each time and the previous time, based on the difference of the comparison. For example, through the comparison of the detection data before and after, it is found that the capacity of the storage battery has decreased by 5Ah. Referring to the standard that the preset amplitude is lowered by 0.05V for every 10Ah decrease in capacity, the current preset amplitude of 0.7V can be adjusted to 0.675V; or referring to the standard that the preset rate is increased by 0.01V for every 10Ah decrease in capacity, the current preset rate can be increased from 0.05V / minute to 0.55V / minute. In this way, as the working time of the parking air conditioner progresses, the capacity of the storage battery is continuously detected, and the preset amplitude or preset rate is continuously corrected, so that the accuracy of the result of judging the operating state of the engine will not decrease, and a stable detection state is maintained.

[0069] In some embodiments of the present application, controlling the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine includes:

[0070] When the engine is in the on state, controlling the compressor to start at a preset high frequency increase rate for a first preset time;

[0071] Controlling the compressor to increase the frequency by a preset frequency at the current frequency.

[0072] When the engine is in the off state, controlling the compressor to start at a preset low frequency increase rate for a second preset time.

[0073] Wherein the second preset time is greater than the first preset time.

[0074] Specifically, in this embodiment, the change curve of the operating state of the compressor is as Figure 4 shown. When the parking air conditioner is turned on and it is determined that the engine is in the on state, the compressor can be first controlled to start quickly at a preset high frequency increase rate for a short first preset time. For example, controlling the compressor to operate at a frequency increase rate of 30Hz / s for 2 seconds, so that the operating frequency of the compressor quickly increases to 60Hz, such as Figure 4 the changing line segment L1 in, and then on the basis of the current frequency, using a lower frequency increase rate to increase the frequency of the compressor by a preset frequency, such as increasing the frequency by another 30Hz, so that the operating frequency of the compressor finally reaches an ultra-high frequency of 90Hz, such as Figure 4The changing line segment L2 therein enables the space where the vehicle is located to cool down rapidly. Then, the parked vehicle air conditioner monitors the change in the room temperature in the space. If the preset temperature has been reached, or the compressor has run at this ultra-high frequency for a preset time such as 5 minutes, the compressor is then controlled to exit this ultra-high frequency operation to reduce the power supply load on the vehicle's generator.

[0075] When the engine is off, since the power supply is completely from the battery at this time, the compressor is not suitable for running at high frequency, and the frequency increase rate should be relatively low. After the parked vehicle air conditioner is turned on, the compressor can be controlled to start at a preset low frequency increase rate for a second preset time, such as running at a frequency increase rate of 1 Hz / s for about 1 minute, and then slowly increasing the frequency to 60 Hz, such as Figure 4 The changing line segment L3 therein, so as to control the working current of the compressor from being too large.

[0076] Further, in some embodiments of the present invention, before controlling the operating frequency of the compressor of the parked vehicle air conditioner according to the operating state of the engine, it further includes:

[0077] S600. Obtain the current ambient temperature of the parked vehicle air conditioner;

[0078] S700. Obtain the high and low pressure differences corresponding to the exhaust and suction of the compressor of the parked vehicle air conditioner;

[0079] S800. When the current ambient temperature is within a preset temperature range and the high and low pressure differences are within a preset range value, allow the compressor to start.

[0080] When the compressor of the parked vehicle air conditioner starts, certain conditions need to be met for the ambient temperature and the high and low pressure differences at the exhaust and suction ports of the compressor. Otherwise, if the ambient temperature is too high or too low, and the high and low pressure differences corresponding to the exhaust and suction ports of the compressor are too low or too high, it will easily lead to an imbalance in the pressure inside the compressor, resulting in a phenomenon that the compressor starts smoothly and fails. Specifically, taking the refrigeration mode as an example, the current ambient temperature needs to meet the condition of being greater than or equal to 20°C and less than 50°C, and the high and low pressure differences in the condenser pipeline can be determined by judging the difference between the condenser pipe temperature and the outdoor ambient temperature. Generally, the difference between the two is greater than or equal to zero and less than or equal to 6°C. When the above conditions are met, it can be determined that the pressure inside the compressor is not too high or too low, so that the compressor can start smoothly. Thereby improving the working reliability of the parked vehicle air conditioner.

[0081] Further, in some embodiments of the present invention, when the engine is off, the above control method further includes:

[0082] Determine the capacity of the battery;

[0083] When the engine is in a stopped state, control the operating frequency and operating time of the compressor according to the capacity to prevent the battery from discharging too much and causing a dead battery.

[0084] In this embodiment, the capacity of the battery can be estimated by referring to the solution in the foregoing embodiment. Further, the current estimated value of the battery capacity can be compared with the previous detection results to obtain data on the change in the battery capacity, and the operating frequency and operating time of the compressor this time can be controlled according to this changed data. For example, when the estimated capacity of the battery is 200 Ah, the compressor can be controlled to operate at a frequency of 60 Hz for 10 hours, and when the battery capacity is 190 Ah, the compressor can be controlled to operate at a frequency of 60 Hz for 9 hours. Or if it is estimated that the battery capacity this time has decreased by 15 Ah compared with the previous detection, the operating frequency of the compressor this time can be adjusted to 55 Hz and it can operate for 9 hours. This prevents the battery from being damaged due to over-discharge.

[0085] The present invention also provides a controller for a parking air conditioner, as Figure 5 shown. The controller 20 is powered by the vehicle's battery 10. Generally, two batteries 10 of a heavy-duty truck are connected in series, with a voltage reaching 24 V and a capacity of up to 220 Ah. The working current of the parking air conditioner can reach up to about 35 A according to the change in the operating frequency of the compressor 30. When the vehicle's engine is started, it drives the generator to generate electricity. On the one hand, it charges the battery 10, and at the same time supplies power to the parking air conditioner. After the parking air conditioner is turned on, the operating current of the compressor 30 is provided by the generator.

[0086] In this embodiment, the controller 20 is configured to: obtain the voltage change state of the battery 10 that supplies power to the parking air conditioner when the parked compressor 30 is turned on; determine the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state; and control the operating frequency of the compressor 30 of the parking air conditioner according to the operating state of the engine.

[0087] The operation of the parking air conditioner is directly powered by the battery 10 with direct current. When the compressor 30 of the parking air conditioner starts, it consumes a large amount of current, such as exceeding 30A, which will cause the voltage of the battery 10 to drop. After the vehicle engine starts, it drives the generator to charge the battery 10 at the same time. At this time, the operating current of the parking air conditioner is provided by the generator, and its voltage will also drop, but it is significantly different from the voltage drop change when the generator stops supplying power to the battery 10. Therefore, by detecting the change characteristics of the voltage of the battery 10, the operating state of the engine can be determined, such as whether the engine is stopped or started, and even further, the rotational speed state of the engine at this time can be identified. Because at high rotational speeds, the generated voltage of the generator is also high, and the voltage applied to the battery 10 also correspondingly increases. Therefore, it can be identified through the change of the voltage value.

[0088] When it is identified whether the operating state of the engine is started or stopped, the corresponding operating frequency of the compressor 30 can be controlled. If the engine is stopped, the operating frequency of the compressor 30 can be controlled to decrease correspondingly, so as to control the current consumption of the compressor 30 below the current limit value of the battery 10 power supply and avoid over-discharging of the battery 10; if the engine is running, the operating frequency of the compressor 30 can be controlled to increase, so as to increase the refrigeration capacity of the parking air conditioner and quickly cool down the space where the vehicle is located. Further, according to the different corresponding high and low output voltages of the generator driven by the high and low rotational speeds of the engine during operation, the specific frequency values of the high operating frequency of the compressor 30 can be controlled, so as to fully match the power supply voltage and the operating frequency of the compressor 30, and further achieve a rapid cooling effect.

[0089] Therefore, the controller 20 for the parking air conditioner in this application identifies the operating state of the engine according to the voltage change of the battery 10, and then controls the operating frequency of the compressor 30 of the parking air conditioner according to the operating state of the engine, so that the battery 10 will not be over-discharged and damaged during power supply, and the refrigeration capacity of the parking air conditioner is increased as much as possible during engine operation to achieve a rapid cooling effect.

[0090] The present invention also proposes a parking air conditioner, which is provided with the controller for the parking air conditioner mentioned in the above embodiment. The parking air conditioner can accurately identify the operating state of the vehicle engine and control the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine, so that the battery will not be over-discharged and damaged during power supply, and the refrigeration capacity of the parking air conditioner is increased as much as possible during engine operation to achieve a rapid cooling effect, thereby improving the user experience.

[0091] In the description of this specification, the descriptions referring to terms such as "first embodiment", "second embodiment", "example", etc. mean that the specific methods, devices or features described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, methods, devices or features described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0092] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A control method for a parking air conditioner, characterized in that, The control method includes: Obtaining the voltage change state of the battery that powers the parking air conditioner when the compressor of the parking air conditioner is turned on; Determining the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state; Controlling the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine; The obtaining of the voltage change state of the battery that powers the parking air conditioner includes: Obtaining the voltage drop amplitude of the battery; The determining of the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state includes: When the voltage drop amplitude of the battery is lower than a preset amplitude, determining that the engine is in the on state; otherwise, the engine is in the off state; The control method further includes: Determining the capacity of the battery; Correcting the preset amplitude according to the capacity; The obtaining of the voltage change state of the battery that powers the parking air conditioner includes: Obtaining the voltage drop rate of the battery; The determining of the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state includes: When the voltage drop rate of the battery is lower than a preset rate, determining that the engine is in the on state; otherwise, the engine is in the off state; The control method further includes: Determining the capacity of the battery; Correcting the preset rate according to the capacity; The controlling of the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine includes: When the engine is in the on state, controlling the compressor to start at a preset high frequency increase rate for a first preset time; Controlling the compressor to increase the frequency by a preset frequency at the current frequency; When the engine is in the off state, controlling the compressor to start at a preset low frequency increase rate for a second preset time; Wherein the second preset time is greater than the first preset time; The control method further includes: Determining the capacity of the battery; When the engine is in the off state, controlling the operating frequency and operating time of the compressor according to the capacity to avoid excessive discharge of the battery; The determining of the capacity of the battery includes: When the engine is in the off state, detecting the operating current and voltage of the compressor in real time and maintaining the operation of the compressor for a third preset time; Calculating the power consumption of the compressor in real time according to the operating current and voltage of the compressor; Calculating the power consumption of the compressor according to a series of the power consumption values within the third preset time; Estimating the capacity of the battery according to the magnitude of the power consumption of the compressor; Before controlling the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine, it further includes: Obtaining the current ambient temperature of the parking air conditioner; Obtaining the high and low pressure differential corresponding to the exhaust and suction of the compressor of the parking air conditioner; When the current ambient temperature is within a preset temperature range and the high and low pressure differential is within a preset range value, allowing the compressor to start.

2. A controller for a parking air conditioner, the controller using the control method for a parking air conditioner as described in claim 1, the controller being powered by a battery of the parking air conditioner, the controller being connected to a compressor to control the operating frequency of the compressor, characterized in that, The controller is configured to: Obtain the voltage change state of the battery that powers the parking air conditioner when the compressor of the parking air conditioner is turned on; Determine the operating state of the engine of the vehicle where the parking air conditioner is located according to the voltage change state; Control the operating frequency of the compressor of the parking air conditioner according to the operating state of the engine.

3. A parking air conditioner, wherein a controller for the parking air conditioner as described in claim 2 is provided inside the parking air conditioner.

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