Air conditioning compressor overheat protection method and system, excavator

Abstract

The present invention relates to the technical field of air-conditioning compressors, and discloses an air-conditioning compressor overheat protection method and system, as well as an excavator. The method comprises: obtaining real-time operating data of an air-conditioning system, and determining whether the air-conditioning system meets a critical overheating fault condition based on the real-time operating data; and performing an overheating protection operation on the air-conditioning compressor when it is determined that the air-conditioning system meets the critical overheating fault condition. It can be seen that the present invention can effectively avoid failures of the air-conditioning compressor due to overheating. At the same time, after the overheating protection operation of the air-conditioning compressor is triggered by the overheating protection method of the present invention, the air-conditioning compressor can be used again without additional maintenance, thereby improving the sustainability and efficiency of the air-conditioning system's refrigeration operation, and can maintain efficient refrigeration operation of the air-conditioning system without causing an overheating fault in the air-conditioning compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning compressors, and in particular to an air-conditioning compressor overheating protection method and system, and an excavator. Background Art

[0002] At present, in order to avoid overheating failure of the air-conditioning compressor in the excavator, a thermal fuse can be designed on the coil inside the clutch of the air-conditioning compressor, or a rubber suction cup can be used as the suction cup of the air-conditioning compressor clutch.

[0003] However, in practice, thermal fuses are designed to provide overheat protection by melting when the air conditioner compressor malfunctions. Rubber suction cups also provide overheat protection by melting when the compressor malfunctions. This means that once the current overheat protection scheme is triggered, the air conditioner compressor cannot be used again until the clutch is replaced with a new thermal fuse or rubber suction cup. Furthermore, clutch maintenance is time-consuming and inefficient. Therefore, ensuring the air conditioner compressor maintains efficient cooling while maintaining overheat protection has become a pressing issue. Summary of the Invention

[0004] The present invention provides an air-conditioning compressor overheating protection method and system, and an excavator, which can improve the sustainability and efficiency of the refrigeration work of the air-conditioning system and enable the air-conditioning system to maintain efficient refrigeration work without the air-conditioning compressor overheating failure.

[0005] A first aspect of the present invention discloses a method for overheating protection of an air-conditioning compressor, the method comprising:

[0006] Acquiring real-time operating data of the air conditioning system, and determining whether the air conditioning system meets a critical overheating fault condition based on the real-time operating data;

[0007] When it is determined that the air-conditioning system meets the critical condition for overheating fault, an overheating protection operation is performed on the air-conditioning compressor.

[0008] As an optional embodiment, in the first aspect of the present invention, the real-time operating data includes real-time operating pressure, real-time headwind speed and real-time ambient temperature;

[0009] The acquiring of real-time operating data of the air-conditioning system and determining whether the air-conditioning system meets a critical overheating fault condition based on the real-time operating data includes:

[0010] Acquiring the real-time operating pressure of the air-conditioning system, the real-time headwind speed of the air-conditioning condenser in the air-conditioning system, and the real-time ambient temperature outside the air-conditioning compressor;

[0011] determining a pressure state of the air-conditioning system based on a preset operating pressure threshold and the real-time operating pressure, determining a wind speed state of the air-conditioning condenser based on a preset headwind speed threshold and the real-time headwind speed, and determining a temperature state of the air-conditioning compressor based on a preset ambient temperature threshold and the real-time ambient temperature;

[0012] When the pressure state, the wind speed state and the temperature state meet the preset first air-conditioning system state condition, start timing and record the state operation time. If the state operation time exceeds the preset operation time threshold, it is determined that the air-conditioning system meets the overheating fault critical condition.

[0013] As an optional embodiment, in the first aspect of the present invention, the operating pressure threshold includes a first pressure threshold and a second pressure threshold, the ambient temperature threshold includes a first temperature threshold and a second temperature threshold, the first pressure threshold is greater than the second pressure threshold, and the first temperature threshold is greater than the second temperature threshold;

[0014] The determining of the pressure state of the air-conditioning system according to a preset operating pressure threshold and the real-time operating pressure, determining the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature include:

[0015] comparing the real-time operating pressure with the first pressure threshold and the second pressure threshold respectively; when the real-time operating pressure is greater than the first pressure threshold, the air-conditioning system is in a first pressure state; and when the real-time operating pressure is greater than the second pressure threshold and less than or equal to the first pressure threshold, the air-conditioning system is in a second pressure state;

[0016] comparing the real-time headwind speed with the headwind speed threshold, wherein when the real-time headwind speed is less than the headwind speed threshold, the air conditioning condenser is in a first wind speed state; and when the real-time headwind speed is greater than or equal to the headwind speed threshold, the air conditioning condenser is in a second wind speed state;

[0017] The real-time ambient temperature is compared with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air-conditioning compressor is in a first temperature state; when the real-time ambient temperature is less than the second temperature threshold, the air-conditioning compressor is in a second temperature state.

[0018] As an optional implementation manner, in the first aspect of the present invention, the running time threshold includes a first time threshold and a second time threshold;

[0019] When the pressure state, the wind speed state, and the temperature state meet a preset first air-conditioning system state condition, starting to time and record the state operation time, and if the state operation time exceeds a preset operation time threshold, determining that the air-conditioning system meets the overheating fault critical condition, includes:

[0020] When it is determined that the first air conditioning system state condition is the first pressure state, the first wind speed state, and the first temperature state, or the first pressure state, the second wind speed state, and the first temperature state, timing and recording the state operation time are started, and if the state operation time exceeds a preset first time threshold, it is determined that the air conditioning system meets the overheating fault critical condition;

[0021] When it is determined that the first air-conditioning system state condition is the second pressure state, the first wind speed state and the second temperature state, or the second pressure state, the second wind speed state and the second temperature state, the timing is started and the state operation time is recorded. If the state operation time exceeds the preset second time threshold, it is determined that the air-conditioning system meets the critical overheating fault condition.

[0022] As an optional embodiment, in the first aspect of the present invention, the real-time operating data includes real-time headwind speed, real-time ambient temperature and operating pressure change value;

[0023] The acquiring of real-time operating data of the air-conditioning system and determining whether the air-conditioning system meets a critical overheating fault condition based on the real-time operating data includes:

[0024] Acquiring a real-time headwind speed of an air-conditioning condenser in the air-conditioning system and a real-time ambient temperature outside the air-conditioning compressor;

[0025] Determining the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature;

[0026] When the wind speed state and the temperature state meet the preset second air-conditioning system state condition, the operating pressure change value of the air-conditioning system per unit time is obtained. If the operating pressure change value is greater than or equal to the preset operating pressure change threshold, it is determined that the air-conditioning system meets the overheating fault critical condition.

[0027] As an optional embodiment, in the first aspect of the present invention, the ambient temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is greater than the second temperature threshold;

[0028] The determining of the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and the determining of the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature, include:

[0029] comparing the real-time headwind speed with the headwind speed threshold, wherein when the real-time headwind speed is less than the headwind speed threshold, the air conditioning condenser is in a first wind speed state; and when the real-time headwind speed is greater than or equal to the headwind speed threshold, the air conditioning condenser is in a second wind speed state;

[0030] The real-time ambient temperature is compared with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air-conditioning compressor is in a first temperature state; when the real-time ambient temperature is less than the second temperature threshold, the air-conditioning compressor is in a second temperature state.

[0031] As an optional embodiment, in the first aspect of the present invention, when the wind speed state and the temperature state meet a preset second air-conditioning system state condition, obtaining an operating pressure change value of the air-conditioning system per unit time, and determining that the air-conditioning system meets the critical overheating fault condition if the operating pressure change value is greater than or equal to a preset operating pressure change threshold, includes:

[0032] When it is determined that the air-conditioning compressor is in the first temperature state, if the air-conditioning condenser is simultaneously in the first wind speed state, determining that the air-conditioning system meets the critical overheating fault condition when the obtained operating pressure change value is greater than or equal to a preset first pressure change threshold; and if the air-conditioning condenser is simultaneously in the second wind speed state, determining that the air-conditioning system meets the critical overheating fault condition when the obtained operating pressure change value is greater than or equal to a preset second pressure change threshold;

[0033] When it is determined that the air-conditioning compressor is in the second temperature state, if the air-conditioning condenser is in the first wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset third pressure change threshold, it is determined that the air-conditioning system meets the critical condition for overheating fault; if the air-conditioning condenser is in the second wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset fourth pressure change threshold, it is determined that the air-conditioning system meets the critical condition for overheating fault.

[0034] As an optional embodiment, in the first aspect of the present invention, when it is determined that the air-conditioning system meets the critical overheating fault condition, performing an overheating protection operation on the air-conditioning compressor includes:

[0035] When the air conditioning system meets the critical overheat fault condition, a power reduction instruction is sent to the target controller; wherein the target controller is configured to perform a parameter adjustment operation on the air conditioning compressor according to the power reduction instruction;

[0036] or,

[0037] When the air-conditioning system meets the critical condition for overheating fault, a shutdown instruction is sent to the air-conditioning compressor; wherein the air-conditioning compressor is configured to stop working according to the shutdown instruction.

[0038] A second aspect of the present invention discloses an air-conditioning compressor overheat protection system, the system comprising:

[0039] a condition judgment module, configured to obtain real-time operating data of the air-conditioning system and determine whether the air-conditioning system meets a critical overheating fault condition based on the real-time operating data;

[0040] The adjustment module is configured to perform an overheat protection operation on the air-conditioning compressor when it is determined that the air-conditioning system meets the critical overheat fault condition.

[0041] As an optional embodiment, in the second aspect of the present invention, the real-time operating data includes real-time operating pressure, real-time headwind speed and real-time ambient temperature;

[0042] The condition judgment module obtains the real-time operating data of the air-conditioning system, and judges whether the air-conditioning system meets the critical condition of overheating fault according to the real-time operating data. The specific method includes:

[0043] Acquiring the real-time operating pressure of the air-conditioning system, the real-time headwind speed of the air-conditioning condenser in the air-conditioning system, and the real-time ambient temperature outside the air-conditioning compressor;

[0044] determining a pressure state of the air-conditioning system based on a preset operating pressure threshold and the real-time operating pressure, determining a wind speed state of the air-conditioning condenser based on a preset headwind speed threshold and the real-time headwind speed, and determining a temperature state of the air-conditioning compressor based on a preset ambient temperature threshold and the real-time ambient temperature;

[0045] When the pressure state, the wind speed state and the temperature state meet the preset first air-conditioning system state condition, start timing and record the state operation time. If the state operation time exceeds the preset operation time threshold, it is determined that the air-conditioning system meets the overheating fault critical condition.

[0046] As an optional embodiment, in the second aspect of the present invention, the operating pressure threshold includes a first pressure threshold and a second pressure threshold, the ambient temperature threshold includes a first temperature threshold and a second temperature threshold, the first pressure threshold is greater than the second pressure threshold, and the first temperature threshold is greater than the second temperature threshold;

[0047] The determining of the pressure state of the air-conditioning system according to a preset operating pressure threshold and the real-time operating pressure, determining the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature include:

[0048] comparing the real-time operating pressure with the first pressure threshold and the second pressure threshold respectively; when the real-time operating pressure is greater than the first pressure threshold, the air-conditioning system is in a first pressure state; and when the real-time operating pressure is greater than the second pressure threshold and less than or equal to the first pressure threshold, the air-conditioning system is in a second pressure state;

[0049] comparing the real-time headwind speed with the headwind speed threshold, wherein when the real-time headwind speed is less than the headwind speed threshold, the air conditioning condenser is in a first wind speed state; and when the real-time headwind speed is greater than or equal to the headwind speed threshold, the air conditioning condenser is in a second wind speed state;

[0050] The real-time ambient temperature is compared with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air-conditioning compressor is in a first temperature state; when the real-time ambient temperature is less than the second temperature threshold, the air-conditioning compressor is in a second temperature state.

[0051] As an optional implementation, in the second aspect of the present invention, the running time threshold includes a first time threshold and a second time threshold;

[0052] When the pressure state, the wind speed state, and the temperature state meet a preset first air-conditioning system state condition, starting to time and record the state operation time, and if the state operation time exceeds a preset operation time threshold, determining that the air-conditioning system meets the overheating fault critical condition, includes:

[0053] When it is determined that the first air conditioning system state condition is the first pressure state, the first wind speed state, and the first temperature state, or the first pressure state, the second wind speed state, and the first temperature state, timing and recording the state operation time are started, and if the state operation time exceeds a preset first time threshold, it is determined that the air conditioning system meets the overheating fault critical condition;

[0054] When it is determined that the first air-conditioning system state condition is the second pressure state, the first wind speed state and the second temperature state, or the second pressure state, the second wind speed state and the second temperature state, the timing is started and the state operation time is recorded. If the state operation time exceeds the preset second time threshold, it is determined that the air-conditioning system meets the critical overheating fault condition.

[0055] As an optional embodiment, in the second aspect of the present invention, the real-time operating data includes real-time headwind speed, real-time ambient temperature and operating pressure change value;

[0056] The condition judgment module obtains the real-time operating data of the air-conditioning system, and judges whether the air-conditioning system meets the critical condition of overheating fault according to the real-time operating data. The specific method includes:

[0057] Acquiring a real-time headwind speed of an air-conditioning condenser in the air-conditioning system and a real-time ambient temperature outside the air-conditioning compressor;

[0058] Determining the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature;

[0059] When the wind speed state and the temperature state meet the preset second air-conditioning system state condition, the operating pressure change value of the air-conditioning system per unit time is obtained. If the operating pressure change value is greater than or equal to the preset operating pressure change threshold, it is determined that the air-conditioning system meets the overheating fault critical condition.

[0060] As an optional implementation, in the second aspect of the present invention, the ambient temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is greater than the second temperature threshold;

[0061] The determining of the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and the determining of the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature, include:

[0062] comparing the real-time headwind speed with the headwind speed threshold, wherein when the real-time headwind speed is less than the headwind speed threshold, the air conditioning condenser is in a first wind speed state; and when the real-time headwind speed is greater than or equal to the headwind speed threshold, the air conditioning condenser is in a second wind speed state;

[0063] The real-time ambient temperature is compared with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air-conditioning compressor is in a first temperature state; when the real-time ambient temperature is less than the second temperature threshold, the air-conditioning compressor is in a second temperature state.

[0064] As an optional embodiment, in the second aspect of the present invention, when the wind speed state and the temperature state meet a preset second air-conditioning system state condition, obtaining an operating pressure change value of the air-conditioning system per unit time, and determining that the air-conditioning system meets the critical overheating fault condition if the operating pressure change value is greater than or equal to a preset operating pressure change threshold, includes:

[0065] When it is determined that the air-conditioning compressor is in the first temperature state, if the air-conditioning condenser is simultaneously in the first wind speed state, determining that the air-conditioning system meets the critical overheating fault condition when the obtained operating pressure change value is greater than or equal to a preset first pressure change threshold; and if the air-conditioning condenser is simultaneously in the second wind speed state, determining that the air-conditioning system meets the critical overheating fault condition when the obtained operating pressure change value is greater than or equal to a preset second pressure change threshold;

[0066] When it is determined that the air-conditioning compressor is in the second temperature state, if the air-conditioning condenser is in the first wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset third pressure change threshold, it is determined that the air-conditioning system meets the critical condition for overheating fault; if the air-conditioning condenser is in the second wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset fourth pressure change threshold, it is determined that the air-conditioning system meets the critical condition for overheating fault.

[0067] As an optional embodiment, in the second aspect of the present invention, when it is determined that the air-conditioning system meets the critical overheating fault condition, performing an overheating protection operation on the air-conditioning compressor includes:

[0068] When the air conditioning system meets the critical overheat fault condition, a power reduction instruction is sent to the target controller; wherein the target controller is configured to perform a parameter adjustment operation on the air conditioning compressor according to the power reduction instruction;

[0069] or,

[0070] When the air-conditioning system meets the critical condition for overheating fault, a shutdown instruction is sent to the air-conditioning compressor; wherein the air-conditioning compressor is configured to stop working according to the shutdown instruction.

[0071] A third aspect of the present invention discloses an excavator, comprising:

[0072] Air conditioning compressor;

[0073] A controller is used to execute the air-conditioning compressor overheating protection method described in the first embodiment.

[0074] Compared with the prior art, the present invention has the following beneficial effects:

[0075] The air-conditioning compressor overheating protection method provided by the present invention determines whether the air-conditioning system meets the critical conditions for overheating failure by obtaining real-time working data of the air-conditioning system, and performs overheating protection operation on the air-conditioning compressor when the air-conditioning system meets the critical conditions for overheating failure, thereby effectively avoiding failure of the air-conditioning compressor caused by overheating. At the same time, after the overheating protection operation of the air-conditioning compressor is triggered, the air-conditioning compressor can be used again without additional maintenance, thereby improving the sustainability and efficiency of the refrigeration work of the air-conditioning compressor, so that the air-conditioning compressor can maintain efficient refrigeration work without overheating failure.

[0076] The air-conditioning compressor overheating protection system provided by the present invention corresponds to the above-mentioned air-conditioning compressor overheating protection method. The real-time working data of the air-conditioning system is obtained by the condition judgment module to judge whether the air-conditioning system meets the critical condition of overheating fault. The adjustment module performs an overheating protection operation on the air-conditioning compressor when the air-conditioning system meets the critical condition of overheating fault, thereby effectively avoiding the failure of the air-conditioning compressor caused by overheating. At the same time, after the overheating protection operation of the air-conditioning compressor is triggered, the air-conditioning compressor can be used again without additional maintenance. Therefore, the sustainability and efficiency of the refrigeration work of the air-conditioning system can be improved, and the air-conditioning system can maintain efficient refrigeration work under the premise that the air-conditioning compressor will not have an overheating fault.

[0077] The excavator provided by the present invention adopts the above-mentioned air-conditioning compressor overheating protection method. The controller in the excavator determines whether the air-conditioning system meets the critical conditions for overheating failure by obtaining real-time working data of the air-conditioning system. When the air-conditioning system meets the critical conditions for overheating failure, the overheating protection operation is performed on the air-conditioning compressor, thereby effectively avoiding failures of the air-conditioning compressor caused by overheating. At the same time, after the overheating protection operation of the air-conditioning compressor is triggered, the air-conditioning compressor can be used again without additional maintenance. Therefore, the sustainability and efficiency of the refrigeration work of the air-conditioning system can be improved, and the air-conditioning system can maintain efficient refrigeration work under the premise that the air-conditioning compressor will not have overheating failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0079] Figure 1 This is a flow chart of an air-conditioning compressor overheat protection method disclosed in an embodiment of the present invention;

[0080] Figure 2 The present invention discloses an air-conditioning compressor overheating protection system.

[0081] Reference numerals:

[0082] Condition judgment module 201 and adjustment module 202. DETAILED DESCRIPTION

[0083] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0084] The terms "first," "second," and so on, in the description and claims of the present invention and the accompanying drawings are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or end comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed therein, or may optionally include other steps or elements inherent to such process, method, product, or end.

[0085] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0086] At present, in order to avoid overheating failure of the air-conditioning compressor in the excavator, a thermal fuse can be designed on the coil inside the clutch of the air-conditioning compressor, or a rubber suction cup can be used as the suction cup of the air-conditioning compressor clutch.

[0087] However, in practice, thermal fuses are designed to provide overheat protection by melting when the air conditioner compressor malfunctions. Rubber suction cups also provide overheat protection by melting when the compressor malfunctions. This means that once the current overheat protection scheme is triggered, the air conditioner cannot be used again until the clutch is replaced with a new thermal fuse or rubber suction cup. Furthermore, clutch maintenance is time-consuming, resulting in low efficiency. Therefore, ensuring that the air conditioner compressor is protected from overheating while maintaining efficient cooling performance has become a pressing issue.

[0088] In this regard, the present invention discloses an air-conditioning compressor overheating protection method and system, and an excavator, which can improve the sustainability and efficiency of the air-conditioning system's refrigeration work, and can enable the air-conditioning system to maintain efficient refrigeration work without the air-conditioning compressor overheating failure.

[0089] Example 1

[0090] See also Figure 1 , Figure 1 FIG. 1 is a flow chart of an air-conditioning compressor overheat protection method disclosed in an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0091] 101. Obtain real-time operating data of the air-conditioning system, and determine whether the air-conditioning system meets the critical condition of overheating fault based on the real-time operating data.

[0092] In embodiments of the present invention, the air conditioning compressor can be used in environments such as the operating room of a working machine such as an excavator, or indoors in a building, to provide cooling and temperature reduction in such environments. Furthermore, the real-time operating data includes one or more pieces of real-time data collected by the air conditioning compressor during cooling operation, and the real-time operating data of the air conditioning system can directly or indirectly affect the operating temperature of the air conditioning compressor.

[0093] Furthermore, the critical overheating condition can be pre-calculated by measuring the air conditioning compressor's operating conditions in corresponding scenarios. The critical overheating condition can reflect whether the impact of real-time operating data on the air conditioning compressor's operating temperature has reached a critical overheating condition. When the air conditioning system's real-time operating data indicates that the impact on the air conditioning compressor's operating temperature has reached a critical level, the air conditioning system is determined to have met the critical overheating condition. Conversely, when the real-time operating data indicates that the impact on the air conditioning compressor's operating temperature has not yet reached a critical level, the air conditioning compressor is determined to have not met the critical overheating condition.

[0094] 102. When it is determined that the air-conditioning system meets the critical condition for overheating fault, an overheating protection operation is performed on the air-conditioning compressor.

[0095] In this embodiment of the present invention, when the acquired real-time operating data determines that the air conditioning system meets the critical overheating fault conditions, it indicates that the air conditioning system has reached the critical overheating fault condition and the air conditioning system cannot continue to maintain the current operating state. Otherwise, the air conditioning compressor will overheat and fail, and it will be impossible to resume use. At this time, the air conditioning compressor is activated for overheat protection and a corresponding fault handling solution is provided to ensure that the air conditioning compressor does not overheat and fail, thereby achieving overheat protection for the air conditioning compressor.

[0096] As can be seen, the air conditioning compressor overheat protection method of the present invention uses the real-time operating data of the air conditioning system to determine whether the air conditioning system meets the critical overheating fault conditions. When the air conditioning system meets the critical overheating fault conditions, it performs an overheating protection operation on the air conditioning compressor, thereby effectively avoiding failures of the air conditioning compressor caused by overheating. At the same time, after triggering the overheating protection operation of the air conditioning compressor, the overheating protection method of the present invention can be used again without additional maintenance of the air conditioning compressor, thereby improving the sustainability and efficiency of the air conditioning system's cooling operation, enabling the air conditioning system to maintain efficient cooling operation without the occurrence of overheating faults.

[0097] In an optional embodiment, the real-time operating data includes real-time operating pressure, real-time headwind speed, and real-time ambient temperature. Acquiring the real-time operating data of the air conditioning system and determining whether the air conditioning system meets the critical overheating fault condition based on the real-time operating data may include the following steps:

[0098] Obtain the real-time operating pressure of the air-conditioning system, the real-time headwind speed of the air-conditioning condenser in the air-conditioning system, and the real-time ambient temperature outside the air-conditioning compressor;

[0099] The pressure state of the air conditioning system is determined based on the preset operating pressure threshold and the real-time operating pressure; the wind speed state of the air conditioning condenser is determined based on the preset headwind speed threshold and the real-time headwind speed; and the temperature state of the air conditioning compressor is determined based on the preset ambient temperature threshold and the real-time ambient temperature;

[0100] When the pressure state, wind speed state and temperature state meet the preset first air-conditioning system state condition, start timing and record the state operation time. If the state operation time exceeds the preset operation time threshold, it is determined that the air-conditioning system meets the critical condition of overheating fault.

[0101] In this optional embodiment, by conducting experimental measurements of the high-temperature operating conditions of the air-conditioning system in the corresponding scenario in advance, it is determined that the real-time operating pressure of the air-conditioning system, the real-time headwind speed of the air-conditioning condenser in the air-conditioning system, and the real-time ambient temperature outside the air-conditioning compressor have the greatest direct or indirect impact on the operating temperature of the air-conditioning compressor, and the operating pressure threshold, headwind speed threshold, and ambient temperature threshold that reach the critical overheating fault are determined.

[0102] Furthermore, after obtaining the real-time operating pressure, real-time headwind speed and real-time ambient temperature, the real-time operating pressure is compared with the operating pressure threshold to determine the pressure state of the air-conditioning system; the real-time headwind speed is compared with the headwind speed threshold to determine the wind speed state of the air-conditioning condenser in the air-conditioning system; the real-time ambient temperature is compared with the ambient temperature threshold to determine the temperature state outside the air-conditioning compressor.

[0103] When the pressure, wind speed, and temperature conditions meet the first pre-set air conditioning system status condition, the air conditioning system may be temporarily at or about to reach overheating threshold. Therefore, the operating time during which the system meets the first air conditioning system status condition is recorded for further evaluation.

[0104] If the operating time in this state has not reached the preset operating time threshold, the operating state of the air conditioning system no longer meets the first air conditioning system state condition, indicating that the air conditioning system is only temporarily at the critical point of overheating failure. The operating temperature of the air conditioning compressor will gradually decrease thereafter and will not cause an overheating failure, so no overheating protection is required. If the operating time in this state exceeds the preset operating time threshold, it indicates that the air conditioning system is about to exceed the critical point of overheating failure. In other words, if the current operating state is maintained, the operating temperature of the air conditioning compressor will exceed the critical point and cause an overheating failure. Therefore, it is determined that the air conditioning system has met the critical overheating failure condition.

[0105] It can be seen that this optional embodiment can also determine whether the air-conditioning system meets the critical conditions for overheating failure by obtaining the real-time operating pressure, real-time headwind speed and real-time ambient temperature that have the greatest direct or indirect impact on the operating temperature of the air-conditioning compressor, thereby improving the accuracy of determining whether the air-conditioning system is at the critical condition for overheating failure.

[0106] In an optional embodiment, the operating pressure threshold includes a first pressure threshold and a second pressure threshold, the ambient temperature threshold includes a first temperature threshold and a second temperature threshold, the first pressure threshold is greater than the second pressure threshold, and the first temperature threshold is greater than the second temperature threshold. Determining the pressure state of the air conditioning system based on the preset operating pressure threshold and the real-time operating pressure, determining the wind speed state of the air conditioning condenser based on the preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air conditioning compressor based on the preset ambient temperature threshold and the real-time ambient temperature may include the following steps:

[0107] comparing the real-time operating pressure with a first pressure threshold and a second pressure threshold respectively; when the real-time operating pressure is greater than the first pressure threshold, the air-conditioning system is in a first pressure state; and when the real-time operating pressure is greater than the second pressure threshold and less than or equal to the first pressure threshold, the air-conditioning system is in a second pressure state;

[0108] The real-time headwind speed is compared with the headwind speed threshold. When the real-time headwind speed is less than the headwind speed threshold, the air conditioning condenser is in a first wind speed state. When the real-time headwind speed is greater than or equal to the headwind speed threshold, the air conditioning condenser is in a second wind speed state.

[0109] The real-time ambient temperature is compared with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air-conditioning compressor is in the first temperature state; when the real-time ambient temperature is less than the second temperature threshold, the air-conditioning compressor is in the second temperature state.

[0110] In this optional embodiment, the operating pressure threshold can be specifically divided into a first pressure threshold P1 and a second pressure threshold P2, and the ambient temperature threshold can be specifically divided into a first temperature threshold t1 and a second temperature threshold t2, where the first pressure threshold P1 is greater than the second pressure threshold P2, and the first temperature threshold t1 is greater than the second temperature threshold t2.

[0111] Let the acquired real-time operating pressure be P. Compare the real-time operating pressure P with the first pressure threshold P1 and the second pressure threshold P2 respectively to determine the pressure state of the air-conditioning system according to the numerical magnitude relationship between the real-time operating pressure P and the first pressure threshold P1 and the second pressure threshold P2. If the real-time operating pressure P is greater than the first pressure threshold P1, i.e., P > P1, the air-conditioning system is in the first pressure state; if the real-time operating pressure P is greater than the second pressure threshold P2 and less than or equal to the first pressure threshold P1, i.e., P1 ≤ P < P2, the air-conditioning system is in the second pressure state.

[0112] Let the acquired real-time face wind speed be V. Compare the real-time face wind speed V with the face wind speed threshold V0 to determine the wind speed state of the air-conditioning condenser according to the numerical magnitude relationship between the real-time face wind speed V and the face wind speed threshold V0. If the real-time face wind speed V is less than the face wind speed threshold V0, i.e., V < V0, the air-conditioning condenser is in the first wind speed state; if the real-time face wind speed V is greater than or equal to the face wind speed threshold V0, i.e., V ≥ V0, the air-conditioning condenser is in the second wind speed state.

[0113] Let the acquired real-time ambient temperature be t. Compare the real-time ambient temperature t with the first temperature threshold t1 and the second temperature threshold t2 respectively to determine the temperature state of the air-conditioning compressor according to the numerical magnitude relationship between the real-time ambient temperature t and the first temperature threshold t1 and the second temperature threshold t2. If the real-time ambient temperature t is greater than the first temperature threshold t1, i.e., t > t1, the air-conditioning compressor is in the first temperature state; if the real-time ambient temperature t is less than the second temperature threshold t2, i.e., t < t2, the air-conditioning compressor is in the second temperature state.

[0114] It can be seen that this optional embodiment can also determine the pressure state, wind speed state and temperature state of the air-conditioning system by specifically judging the magnitude relationship between the real-time operating pressure, the real-time face wind speed and the real-time ambient temperature and their corresponding thresholds, thereby improving the accuracy of judging the working state of the air-conditioning system.

[0115] In an optional embodiment, the operating time threshold includes a first time threshold and a second time threshold. When the pressure state, wind speed state, and temperature state meet a preset first air conditioning system state condition, timing and recording of the state operating time are started. If the state operating time exceeds the preset operating time threshold, it is determined that the air conditioning system meets the critical overheating fault condition, which may include the following steps:

[0116] When it is determined that the air conditioning system is in a first pressure state, a first wind speed state, and a first temperature state, or when the air conditioning system is in a first pressure state, a second wind speed state, and a first temperature state, timing is started and recording the state operation time. If the state operation time exceeds a preset first time threshold, it is determined that the air conditioning system meets the critical condition of overheating fault;

[0117] When it is determined that the air-conditioning system is in the second pressure state, the first wind speed state and the second temperature state, or when the air-conditioning system is in the second pressure state, the second wind speed state and the second temperature state, the timing is started and the state operation time is recorded. If the state operation time exceeds the preset second time threshold, it is determined that the air-conditioning system meets the critical condition of overheating failure.

[0118] In this optional embodiment, the operating time threshold can be specifically divided into a first time threshold T1 and a second time threshold T2. It is understandable that the first time threshold T1 and the second time threshold T2 are obtained by experimental measurement of the high temperature operating conditions of the air conditioning system in the corresponding scenario. The required monitoring time thresholds vary for different air conditioning systems and therefore need to be set based on the calibration results of the air conditioning system.

[0119] When it is determined that the air conditioning system is in the first pressure state, the first wind speed state and the first temperature state, or in the first pressure state, the second wind speed state and the first temperature state, that is, the result of the above size relationship comparison is P>P1, V<V0、t> t1, or when P>P1, V ≥ V0, and t>t1, the state operation time T that meets the current state begins to be recorded. If the state operation time that the air-conditioning system maintains the current state has not yet reached the first time threshold T1, the operating state of the air-conditioning system no longer meets the above conditions, indicating that the air-conditioning system is only temporarily at the critical point of overheating failure and will not cause overheating failure, so no overheating protection is required. If the state operation time T that the air-conditioning system maintains the current state exceeds the first time threshold T1, it indicates that the air-conditioning system is about to exceed the critical point of overheating failure, and it is determined that the air-conditioning system meets the critical condition of overheating failure.

[0120] When it is determined that the air conditioning system is in the second pressure state, the first wind speed state, and the second temperature state, or in the second pressure state, the second wind speed state, and the second temperature state, that is, when the result of the comparison of the above magnitude relationships is P1 ≤ P < P2, V < V0, t < t2, or P1 ≤ P < P2, V ≥ V0, t < t2, start recording the state operation duration T that satisfies the current state. If the state operation duration T of the air conditioning system maintaining the current state has not reached the second duration threshold T2 and the working state of the air conditioning system no longer satisfies the above conditions, it indicates that the air conditioning system is only temporarily at the critical point of overheat failure and will not cause overheat failure. Therefore, overheat protection is not required. If the state operation duration T of the air conditioning system maintaining the current state exceeds the second duration threshold T2, it indicates that the air conditioning system is about to break through the critical point of overheat failure. Therefore, it is determined that the air conditioning system satisfies the overheat failure critical condition at this time.

[0121] It can be understood that when the results of the four working states obtained by comparing the magnitudes of the above respective real-time working data, that is, P > P1, V < V0, t > t1, P > P1, V ≥ V0, t > t1, P1 ≤ P < P2, V < V0, t < t2, or P1 ≤ P < P2, V ≥ V0, t < t2, while determining that the overheat failure critical condition is satisfied at this time, corresponding alarm prompts will also be generated for each working state of the air conditioning system. The alarm prompts can be displayed through the device of the display to prompt the relevant operators of the current overheat critical alarm situation of the air conditioning compressor.

[0122] It can be seen that this optional embodiment can also specifically judge whether the air conditioning system satisfies the overheat failure critical condition under different working state conditions through the first duration threshold and the second duration threshold, thereby further improving the accuracy of judging whether the air conditioning compressor is at the overheat failure critical point.

[0123] In an optional embodiment, the real-time working data includes the real-time oncoming wind speed, the real-time ambient temperature, and the operating pressure change value. Obtaining the real-time working data of the air conditioning system and judging whether the air conditioning system satisfies the overheat failure critical condition based on the real-time working data may include the following steps:

[0124] Obtain the real-time oncoming wind speed of the air conditioning condenser in the air conditioning system and the real-time ambient temperature outside the air conditioning compressor;

[0125] Judge the wind speed state of the air conditioning condenser according to the preset oncoming wind speed threshold and the real-time oncoming wind speed, and judge the temperature state of the air conditioning compressor according to the preset ambient temperature threshold and the real-time ambient temperature;

[0126] When the wind speed state and temperature state meet the preset second air-conditioning system state condition, the operating pressure change value of the air-conditioning system per unit time is obtained. If the operating pressure change value is greater than or equal to the preset operating pressure change threshold, it is determined that the air-conditioning system meets the critical condition of overheating fault.

[0127] In this optional embodiment, by conducting experimental measurements of the high-temperature operating conditions of the air-conditioning system in the corresponding scenario in advance, it is determined that the operating pressure of the air-conditioning system, the real-time headwind speed of the air-conditioning condenser in the air-conditioning system, and the real-time ambient temperature outside the air-conditioning compressor have the greatest direct or indirect impact on the operating temperature of the air-conditioning compressor, and the headwind speed threshold and ambient temperature threshold that reach the critical overheating fault are determined.

[0128] Furthermore, after obtaining the real-time headwind speed and real-time ambient temperature, the real-time headwind speed is compared with the headwind speed threshold to determine the wind speed state of the air-conditioning condenser in the air-conditioning system; the real-time ambient temperature is compared with the ambient temperature threshold to determine the temperature state outside the air-conditioning compressor.

[0129] The above two working states are judged. When the wind speed state and the temperature state meet the preset second air-conditioning system state conditions, it is necessary to further determine whether the operating pressure of the air-conditioning system has reached the critical level that affects the operating temperature of the air-conditioning compressor. At this time, the operating pressure change value of the air-conditioning system per unit time is obtained, and it is determined whether the operating pressure change value is greater than or equal to the preset operating pressure change threshold.

[0130] If the operating pressure change value is less than the preset operating pressure change threshold, it indicates that the operating pressure change of the air conditioning system will not cause the operating temperature to rise too high, that is, it will not cause an overheating fault, and therefore no overheating protection is required. If the operating pressure change value is greater than or equal to the preset operating pressure change threshold, it indicates that the operating pressure change of the air conditioning system will cause the operating temperature of the air conditioning compressor to rise to the critical level of overheating fault. If the operating pressure change continues to increase, it will cause the air conditioning compressor to overheat and fault. Therefore, it is determined that the air conditioning system has met the critical overheating fault condition.

[0131] It can be seen that this optional embodiment can also determine whether the air-conditioning system meets the critical condition of overheating fault by judging the real-time headwind speed and real-time ambient temperature, and further judging the operating pressure change value, thereby improving the accuracy of judging whether the air-conditioning system is at the critical condition of overheating fault.

[0132] In an optional embodiment, the ambient temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is greater than the second temperature threshold. Judging the wind speed state of the air conditioner condenser according to the preset oncoming wind speed threshold and the real-time oncoming wind speed, and judging the temperature state of the air conditioner compressor according to the preset ambient temperature threshold and the real-time ambient temperature may include the following steps:

[0133] Compare the real-time oncoming wind speed with the oncoming wind speed threshold. When the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioner condenser is in the first wind speed state. When the real-time oncoming wind speed is greater than or equal to the oncoming wind speed threshold, the air conditioner condenser is in the second wind speed state;

[0134] Compare the real-time ambient temperature with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air conditioner compressor is in the first temperature state. When the real-time ambient temperature is less than the second temperature threshold, the air conditioner compressor is in the second temperature state.

[0135] In this optional embodiment, the ambient temperature threshold can be specifically divided into a first temperature threshold t1 and a second temperature threshold t2, where the first temperature threshold t1 is greater than the second temperature threshold t2.

[0136] Let the obtained real-time oncoming wind speed be V. Compare the real-time oncoming wind speed V with the oncoming wind speed threshold V0 to determine the wind speed state of the air conditioner condenser according to the numerical size relationship between the real-time oncoming wind speed V and the oncoming wind speed threshold V0. If the real-time oncoming wind speed V is less than the oncoming wind speed threshold V0, that is, V < V0, the air conditioner condenser is in the first wind speed state; if the real-time oncoming wind speed V is greater than or equal to the oncoming wind speed threshold V0, that is, V ≥ V0, the air conditioner condenser is in the second wind speed state.

[0137] Let the obtained real-time ambient temperature be t. Compare the real-time ambient temperature t with the first temperature threshold t1 and the second temperature threshold t2 respectively to determine the temperature state of the air conditioner compressor according to the numerical size relationship between the real-time ambient temperature t and the first temperature threshold t1 and the second temperature threshold t2 respectively. If the real-time ambient temperature t is greater than the first temperature threshold t1, that is, t > t1, the air conditioner compressor is in the first temperature state; if the real-time ambient temperature t is less than the second temperature threshold t2, that is, t < t2, the air conditioner compressor is in the second temperature state.

[0138] It can be seen that this optional embodiment can also determine the wind speed state and the temperature state by specifically judging the size relationship between the real-time oncoming wind speed and the real-time ambient temperature and their corresponding thresholds, thereby improving the accuracy of judging the working state of the air conditioner system.

[0139] In an optional embodiment, when the wind speed state and the temperature state meet a preset second air conditioning system state condition, obtaining an operating pressure change value of the air conditioning system per unit time, and if the operating pressure change value is greater than or equal to a preset operating pressure change threshold, determining that the air conditioning system meets a critical overheating fault condition may include the following steps:

[0140] When it is determined that the air-conditioning compressor is in a first temperature state, if the air-conditioning condenser is simultaneously in a first wind speed state, then the air-conditioning system is determined to have met the critical overheating fault condition when the acquired operating pressure change value is greater than or equal to a preset first pressure change threshold value; and if the air-conditioning condenser is simultaneously in a second wind speed state, then the air-conditioning system is determined to have met the critical overheating fault condition when the acquired operating pressure change value is greater than or equal to a preset second pressure change threshold value;

[0141] When it is determined that the air-conditioning compressor is in the second temperature state, if the air-conditioning condenser is in the first wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset third pressure change threshold, it is determined that the air-conditioning system meets the critical condition of overheating fault. If the air-conditioning condenser is in the second wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset fourth pressure change threshold, it is determined that the air-conditioning system meets the critical condition of overheating fault.

[0142] In this optional embodiment, when it is determined that the air-conditioning compressor is in the first temperature state, if the air-conditioning condenser is simultaneously in the first wind speed state, that is, the result of the above-mentioned magnitude comparison is V<V0、t> At time t1, the air conditioning system's operating pressure change value ΔP per unit time is obtained. If the operating pressure change value ΔP is less than a preset first pressure change threshold ΔP1, the air conditioning system's operating pressure change will not cause an excessive increase in operating temperature, i.e., will not result in an overheating fault, and therefore no overheating protection is required. If the operating pressure change value ΔP is greater than or equal to the preset first pressure change threshold ΔP1, the air conditioning system's operating pressure change will cause the air conditioning compressor's operating temperature to increase to a critical level, thus determining that the air conditioning system meets the critical overheating fault condition.

[0143] When it is determined that the air-conditioning compressor is in the first temperature state, if the air-conditioning condenser is simultaneously in the second wind speed state, that is, when the result of the above magnitude relationship comparison is V ≥ V0 and t > t1, obtain the change value ΔP of the operating pressure of the air-conditioning system per unit time. If the change value ΔP of the operating pressure is less than the preset second pressure change threshold ΔP2, it indicates that the change in the operating pressure of the air-conditioning system will not cause an excessive increase in the working temperature, that is, it will not cause an overheat failure. Therefore, no overheat protection is required. If the change value ΔP of the operating pressure is greater than or equal to the preset second pressure change threshold ΔP2, it indicates that the change in the operating pressure of the air-conditioning system will cause the working temperature of the air-conditioning compressor to increase to the critical level of overheat failure. At this time, it is determined that the air-conditioning system meets the overheat failure critical condition.

[0144] When it is determined that the air-conditioning compressor is in the second temperature state, if the air-conditioning condenser is simultaneously in the first wind speed state, that is, when the result of the above magnitude relationship comparison is V < V0 and t < t2, obtain the change value ΔP of the operating pressure of the air-conditioning system per unit time. If the change value ΔP of the operating pressure is less than the preset third pressure change threshold ΔP3, it indicates that the change in the operating pressure of the air-conditioning system will not cause an excessive increase in the working temperature, that is, it will not cause an overheat failure. Therefore, no overheat protection is required. If the change value ΔP of the operating pressure is greater than or equal to the preset third pressure change threshold ΔP3, it indicates that the change in the operating pressure of the air-conditioning system will cause the working temperature of the air-conditioning compressor to increase to the critical level of overheat failure. At this time, it is determined that the air-conditioning system meets the overheat failure critical condition.

[0145] When it is determined that the air-conditioning compressor is in the second temperature state, if the air-conditioning condenser is simultaneously in the second wind speed state, that is, when the result of the above magnitude relationship comparison is V ≥ V0 and t < t2, obtain the change value ΔP of the operating pressure of the air-conditioning system per unit time. If the change value ΔP of the operating pressure is less than the preset fourth pressure change threshold ΔP4, it indicates that the change in the operating pressure of the air-conditioning system will not cause an excessive increase in the working temperature, that is, it will not cause an overheat failure. Therefore, no overheat protection is required. If the change value ΔP of the operating pressure is greater than or equal to the preset fourth pressure change threshold ΔP4, it indicates that the change in the operating pressure of the air-conditioning system will cause the working temperature of the air-conditioning compressor to increase to the critical level of overheat failure. At this time, it is determined that the air-conditioning system meets the overheat failure critical condition.

[0146] It can be understood that when the results of the four working states obtained by comparing the sizes of the above-mentioned respective real-time working data, namely V < V0, t > t1, V ≥ V0, t > t1, V < V0, t < t2, or V ≥ V0, t < t2, while determining that the overheat fault critical condition is satisfied at this time, corresponding alarm prompts will also be generated for each working state of the air-conditioning system. The alarm prompts can be displayed through the device of the display to prompt the relevant operators of the current overheat critical alarm situation of the air-conditioning compressor.

[0147] It can be seen that this optional embodiment can also specifically judge whether the air-conditioning system meets the overheat fault critical condition under the corresponding working state conditions through different pressure change thresholds, thereby further improving the accuracy of judging whether the air-conditioning compressor is in the overheat fault critical state.

[0148] In an optional embodiment, when it is judged that the air-conditioning system meets the overheat fault critical condition, performing an overheat protection operation on the air-conditioning compressor may include the following steps:

[0149] When the air-conditioning system meets the overheat fault critical condition, send a power reduction instruction to the target controller; wherein, the target controller is used to perform parameter adjustment operations on the air-conditioning compressor according to the power reduction instruction;

[0150] Or,

[0151] When the air-conditioning system meets the overheat fault critical condition, send a shutdown instruction to the air-conditioning compressor; wherein, the air-conditioning compressor is used to stop working according to the shutdown instruction.

[0152] In this optional embodiment, after it is determined that the air-conditioning system meets the overheat fault critical condition, overheat protection needs to be performed on the air-conditioning compressor.

[0153] One way of overheat protection can be to actively reduce the working power of the air-conditioning compressor to perform delayed protection on the air-conditioning compressor. For example, when the air-conditioning system meets the overheat fault critical condition, data is sent to the vehicle controller of the working equipment to request acceleration. Subsequently, the vehicle controller increases the oncoming air speed of the air-conditioning condenser by increasing the speed of the electric fan, silicone oil clutch fan or engine speed, etc., thereby reducing the system working pressure and power, and achieving the protection effect of preventing the compressor from overheating.

[0154] Another overheat protection method is to stop the air conditioner compressor from continuing to operate to ensure that it does not overheat and perform an inspection during the shutdown period. For example, if the air conditioner compressor reaches the overheating failure threshold, or if the air conditioner compressor is still at the overheating failure threshold after the above-mentioned power reduction method is used but the electronic fan, silicone oil clutch fan, or engine speed is increased to the limit, the air conditioner compressor will be shut down, and an overheating alarm message and corresponding fault handling plan will be output on the display. The air conditioner compressor will be inspected during the shutdown period.

[0155] It can be seen that this optional embodiment can also achieve overheating protection for the air-conditioning compressor by reducing the operating power of the air-conditioning compressor or directly shutting down the air-conditioning compressor when the air-conditioning compressor reaches the overheating fault threshold, thereby improving the overheating protection effect of the air-conditioning compressor.

[0156] Example 2

[0157] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of an air-conditioning compressor overheat protection system disclosed in an embodiment of the present invention. Figure 2 As shown, the system may include a condition judgment module 201 and an adjustment module 202, wherein:

[0158] The condition judgment module 201 is used to obtain real-time operating data of the air-conditioning system and judge whether the air-conditioning system meets the critical condition of overheating fault according to the real-time operating data;

[0159] The adjustment module 202 is configured to perform an overheat protection operation on the air-conditioning compressor when it is determined that the air-conditioning system meets a critical overheat fault condition.

[0160] visible, Figure 2 The described system can obtain real-time working data of the air-conditioning system through the condition judgment module 201 to determine whether the air-conditioning system meets the critical condition of overheating fault. The adjustment module 202 performs an overheating protection operation on the air-conditioning compressor when the air-conditioning system meets the critical condition of overheating fault, thereby effectively avoiding the failure of the air-conditioning compressor caused by overheating. At the same time, after the overheating protection operation of the air-conditioning compressor is triggered, the air-conditioning compressor can be used again without additional maintenance. Therefore, the sustainability and efficiency of the refrigeration work of the air-conditioning system can be improved, and the air-conditioning system can maintain efficient refrigeration work under the premise that the air-conditioning compressor will not suffer from overheating fault.

[0161] In an optional embodiment, the real-time operating data includes real-time operating pressure, real-time headwind speed, and real-time ambient temperature. The condition judgment module obtains the real-time operating data of the air-conditioning system and judges whether the air-conditioning system meets the critical condition of overheating fault based on the real-time operating data. The specific method includes:

[0162] Obtain the real-time operating pressure of the air-conditioning system, the real-time headwind speed of the air-conditioning condenser in the air-conditioning system, and the real-time ambient temperature outside the air-conditioning compressor;

[0163] The pressure state of the air conditioning system is determined based on the preset operating pressure threshold and the real-time operating pressure; the wind speed state of the air conditioning condenser is determined based on the preset headwind speed threshold and the real-time headwind speed; and the temperature state of the air conditioning compressor is determined based on the preset ambient temperature threshold and the real-time ambient temperature;

[0164] When the pressure state, wind speed state and temperature state meet the preset first air-conditioning system state condition, start timing and record the state operation time. If the state operation time exceeds the preset operation time threshold, it is determined that the air-conditioning system meets the critical condition of overheating fault.

[0165] It can be seen that this optional embodiment can also determine whether the air-conditioning system meets the critical conditions for overheating failure by obtaining the real-time operating pressure, real-time headwind speed and real-time ambient temperature that have the greatest direct or indirect impact on the operating temperature of the air-conditioning compressor, thereby improving the accuracy of determining whether the air-conditioning system is at the critical condition for overheating failure.

[0166] In another optional embodiment, the operating pressure threshold includes a first pressure threshold and a second pressure threshold, the ambient temperature threshold includes a first temperature threshold and a second temperature threshold, the first pressure threshold is greater than the second pressure threshold, and the first temperature threshold is greater than the second temperature threshold. Specific methods for determining the pressure state of the air conditioning system based on the preset operating pressure threshold and the real-time operating pressure, determining the wind speed state of the air conditioning condenser based on the preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air conditioning compressor based on the preset ambient temperature threshold and the real-time ambient temperature include:

[0167] comparing the real-time operating pressure with a first pressure threshold and a second pressure threshold respectively; when the real-time operating pressure is greater than the first pressure threshold, the air-conditioning system is in a first pressure state; and when the real-time operating pressure is greater than the second pressure threshold and less than or equal to the first pressure threshold, the air-conditioning system is in a second pressure state;

[0168] The real-time headwind speed is compared with the headwind speed threshold. When the real-time headwind speed is less than the headwind speed threshold, the air conditioning condenser is in a first wind speed state. When the real-time headwind speed is greater than or equal to the headwind speed threshold, the air conditioning condenser is in a second wind speed state.

[0169] The real-time ambient temperature is compared with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air-conditioning compressor is in the first temperature state; when the real-time ambient temperature is less than the second temperature threshold, the air-conditioning compressor is in the second temperature state.

[0170] It can be seen that this optional embodiment can also determine the pressure state, wind speed state and temperature state of the air-conditioning compressor by specifically judging the size relationship between the real-time operating pressure, real-time headwind speed and real-time ambient temperature and the corresponding threshold values, thereby improving the accuracy of judging the working state of the air-conditioning system.

[0171] In another optional embodiment, the operating time threshold includes a first time threshold and a second time threshold. When the pressure state, wind speed state, and temperature state meet a preset first air conditioning system state condition, timing and recording of the state operating time are started. If the state operating time exceeds the preset operating time threshold, a specific method for determining that the air conditioning system meets the critical overheating fault condition includes:

[0172] When it is determined that the air conditioning system is in a first pressure state, a first wind speed state, and a first temperature state, or when the air conditioning system is in a first pressure state, a second wind speed state, and a first temperature state, timing is started and recording the state operation time. If the state operation time exceeds a preset first time threshold, it is determined that the air conditioning system meets the critical condition of overheating fault;

[0173] When it is determined that the air-conditioning system is in the second pressure state, the first wind speed state and the second temperature state, or when the air-conditioning system is in the second pressure state, the second wind speed state and the second temperature state, the timing is started and the state operation time is recorded. If the state operation time exceeds the preset second time threshold, it is determined that the air-conditioning system meets the critical condition of overheating failure.

[0174] It can be seen that this optional embodiment can also specifically use the first time threshold and the second time threshold to determine whether the air-conditioning system meets the critical condition of overheating failure under different working conditions, thereby further improving the accuracy of determining whether the air-conditioning system is at the critical condition of overheating failure.

[0175] In an optional embodiment, the real-time operating data includes real-time headwind speed, real-time ambient temperature, and operating pressure change value. The condition judgment module obtains the real-time operating data of the air-conditioning system and judges whether the air-conditioning system meets the critical condition of overheating fault based on the real-time operating data. The specific method includes:

[0176] Obtain the real-time wind speed of the air-conditioning condenser and the real-time ambient temperature outside the air-conditioning compressor in the air-conditioning system;

[0177] The wind speed state of the air conditioner condenser is determined based on the preset headwind speed threshold and the real-time headwind speed, and the temperature state of the air conditioner compressor is determined based on the preset ambient temperature threshold and the real-time ambient temperature;

[0178] When the wind speed state and temperature state meet the preset second air-conditioning system state condition, the operating pressure change value of the air-conditioning system per unit time is obtained. If the operating pressure change value is greater than or equal to the preset operating pressure change threshold, it is determined that the air-conditioning system meets the critical condition of overheating fault.

[0179] It can be seen that this optional embodiment can also determine whether the air-conditioning system meets the critical condition of overheating fault by judging the real-time headwind speed and real-time ambient temperature, and further judging the operating pressure change value, thereby improving the accuracy of judging whether the air-conditioning system is at the critical condition of overheating fault.

[0180] In another optional embodiment, the ambient temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is greater than the second temperature threshold. Specific methods for determining the wind speed state of the air conditioner condenser based on a preset headwind speed threshold and a real-time headwind speed, and determining the temperature state of the air conditioner compressor based on the preset ambient temperature threshold and the real-time ambient temperature include:

[0181] The real-time headwind speed is compared with the headwind speed threshold. When the real-time headwind speed is less than the headwind speed threshold, the air conditioning condenser is in a first wind speed state. When the real-time headwind speed is greater than or equal to the headwind speed threshold, the air conditioning condenser is in a second wind speed state.

[0182] The real-time ambient temperature is compared with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air-conditioning compressor is in the first temperature state; when the real-time ambient temperature is less than the second temperature threshold, the air-conditioning compressor is in the second temperature state.

[0183] It can be seen that this optional embodiment can also determine the wind speed state and temperature state by specifically judging the size relationship between the real-time headwind speed and the real-time ambient temperature and the corresponding threshold values, thereby improving the accuracy of judging the working state of the air-conditioning system.

[0184] In yet another optional embodiment, when the wind speed state and the temperature state meet a preset second air conditioning system state condition, a change value of the operating pressure of the air conditioning system per unit time is obtained. If the change value of the operating pressure is greater than or equal to a preset operating pressure change threshold, determining that the air conditioning system meets a critical overheating fault condition is determined in a specific manner including:

[0185] When it is determined that the air-conditioning compressor is in a first temperature state, if the air-conditioning condenser is simultaneously in a first wind speed state, then the air-conditioning system is determined to have met the critical overheating fault condition when the acquired operating pressure change value is greater than or equal to a preset first pressure change threshold value; and if the air-conditioning condenser is simultaneously in a second wind speed state, then the air-conditioning system is determined to have met the critical overheating fault condition when the acquired operating pressure change value is greater than or equal to a preset second pressure change threshold value;

[0186] When it is determined that the air-conditioning compressor is in the second temperature state, if the air-conditioning condenser is in the first wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset third pressure change threshold, it is determined that the air-conditioning system meets the critical condition of overheating fault. If the air-conditioning condenser is in the second wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset fourth pressure change threshold, it is determined that the air-conditioning system meets the critical condition of overheating fault.

[0187] It can be seen that this optional embodiment can also specifically determine whether the air-conditioning system meets the critical overheating fault condition under the corresponding working conditions through different pressure change thresholds, thereby further improving the accuracy of determining whether the air-conditioning system is at the critical overheating fault condition.

[0188] In another optional embodiment, when the adjustment module determines that the air-conditioning system meets the critical condition of overheating fault, the specific manner in which the overheating protection operation is performed on the air-conditioning compressor includes:

[0189] When the air conditioning system meets the critical condition of overheat fault, a power reduction instruction is sent to the target controller; wherein the target controller is used to perform parameter adjustment operations on the air conditioning compressor according to the power reduction instruction;

[0190] or,

[0191] When the air-conditioning system meets the critical condition of overheating fault, a shutdown instruction is sent to the air-conditioning compressor; wherein the air-conditioning compressor is used to stop working according to the shutdown instruction.

[0192] It can be seen that this optional embodiment can also achieve overheating protection for the air-conditioning compressor by reducing the operating power of the air-conditioning compressor or directly shutting down the air-conditioning compressor when the air-conditioning compressor reaches the overheating fault threshold, thereby improving the overheating protection effect of the air-conditioning compressor.

[0193] Example 3

[0194] An embodiment of the present invention discloses an excavator, which includes an air-conditioning compressor and a controller. The controller is used to execute the air-conditioning compressor overheat protection method described in the above embodiment of the present invention.

[0195] It can be seen that the excavator of the present invention can obtain the real-time working data of the air-conditioning system through the controller to determine whether the air-conditioning system meets the critical conditions for overheating failure. When the air-conditioning system meets the critical conditions for overheating failure, the overheating protection operation is performed on the air-conditioning compressor, thereby effectively avoiding failures of the air-conditioning compressor caused by overheating. At the same time, after the overheating protection operation of the air-conditioning compressor is triggered, the air-conditioning compressor can be used again without additional maintenance. Therefore, the sustainability and efficiency of the refrigeration work of the air-conditioning system can be improved, and the air-conditioning system can maintain efficient refrigeration work without overheating failure of the air-conditioning compressor.

[0196] The device embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, i.e., they may be located in one place or distributed across multiple network modules. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Those skilled in the art can understand and implement the present invention without inventive effort.

[0197] Through the detailed description of the above embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by means of hardware. Based on this understanding, the above technical solution, in essence, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disk storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0198] Finally, it should be noted that the air-conditioning compressor overheating protection method and system, and the excavator disclosed in the embodiments of the present invention are only preferred embodiments of the present invention, and are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for protecting an air-conditioning compressor from overheating, characterized in that: The method comprises: Acquiring real-time operating data of the air conditioning system, and determining whether the air conditioning system meets a critical overheating fault condition based on the real-time operating data; When it is determined that the air conditioning system meets the critical overheating fault condition, performing an overheating protection operation on the air conditioning compressor; The real-time working data includes real-time operating pressure, real-time headwind speed and real-time ambient temperature; The acquiring of real-time operating data of the air-conditioning system and determining whether the air-conditioning system meets a critical overheating fault condition based on the real-time operating data includes: Acquiring the real-time operating pressure of the air-conditioning system, the real-time headwind speed of the air-conditioning condenser in the air-conditioning system, and the real-time ambient temperature outside the air-conditioning compressor in the air-conditioning system; determining a pressure state of the air-conditioning system based on a preset operating pressure threshold and the real-time operating pressure, determining a wind speed state of the air-conditioning condenser based on a preset headwind speed threshold and the real-time headwind speed, and determining a temperature state of the air-conditioning compressor based on a preset ambient temperature threshold and the real-time ambient temperature; When the pressure state, the wind speed state, and the temperature state meet a preset first air-conditioning system state condition, start timing and record the state operation time; if the state operation time exceeds a preset operation time threshold, determine that the air-conditioning system meets the overheating fault critical condition; The operating pressure threshold includes a first pressure threshold and a second pressure threshold, the ambient temperature threshold includes a first temperature threshold and a second temperature threshold, the first pressure threshold is greater than the second pressure threshold, and the first temperature threshold is greater than the second temperature threshold; The determining of the pressure state of the air-conditioning system according to a preset operating pressure threshold and the real-time operating pressure, determining the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature include: comparing the real-time operating pressure with the first pressure threshold and the second pressure threshold respectively; when the real-time operating pressure is greater than the first pressure threshold, the air-conditioning system is in a first pressure state; and when the real-time operating pressure is greater than the second pressure threshold and less than or equal to the first pressure threshold, the air-conditioning system is in a second pressure state; comparing the real-time headwind speed with the headwind speed threshold, wherein when the real-time headwind speed is less than the headwind speed threshold, the air conditioning condenser is in a first wind speed state; and when the real-time headwind speed is greater than or equal to the headwind speed threshold, the air conditioning condenser is in a second wind speed state; The real-time ambient temperature is compared with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air-conditioning compressor is in a first temperature state; when the real-time ambient temperature is less than the second temperature threshold, the air-conditioning compressor is in a second temperature state.

2. The air-conditioning compressor overheat protection method according to claim 1, characterized in that: The running time threshold includes a first time threshold and a second time threshold; When the pressure state, the wind speed state, and the temperature state meet a preset first air-conditioning system state condition, starting to time and record the state operation time, and if the state operation time exceeds a preset operation time threshold, determining that the air-conditioning system meets the overheating fault critical condition, includes: When it is determined that the first air conditioning system state condition is the first pressure state, the first wind speed state, and the first temperature state, or the first pressure state, the second wind speed state, and the first temperature state, timing and recording the state operation time are started, and if the state operation time exceeds a preset first time threshold, it is determined that the air conditioning system meets the overheating fault critical condition; When it is determined that the first air-conditioning system state condition is the second pressure state, the first wind speed state and the second temperature state, or the second pressure state, the second wind speed state and the second temperature state, the timing is started and the state operation time is recorded. If the state operation time exceeds the preset second time threshold, it is determined that the air-conditioning system meets the critical overheating fault condition.

3. The air-conditioning compressor overheat protection method according to claim 1, characterized in that: The real-time working data includes real-time headwind speed, real-time ambient temperature and operating pressure change value; The acquiring of real-time operating data of the air-conditioning system and determining whether the air-conditioning system meets a critical overheating fault condition based on the real-time operating data includes: Acquiring a real-time headwind speed of an air-conditioning condenser in the air-conditioning system and a real-time ambient temperature outside the air-conditioning compressor; Determining the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature; When the wind speed state and the temperature state meet the preset second air-conditioning system state condition, the operating pressure change value of the air-conditioning system per unit time is obtained. If the operating pressure change value is greater than or equal to the preset operating pressure change threshold, it is determined that the air-conditioning system meets the overheating fault critical condition.

4. The air-conditioning compressor overheat protection method according to claim 3, characterized in that: The ambient temperature threshold comprises a first temperature threshold and a second temperature threshold, wherein the first temperature threshold is greater than the second temperature threshold; The determining of the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and the determining of the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature, include: comparing the real-time headwind speed with the headwind speed threshold, wherein when the real-time headwind speed is less than the headwind speed threshold, the air conditioning condenser is in a first wind speed state; and when the real-time headwind speed is greater than or equal to the headwind speed threshold, the air conditioning condenser is in a second wind speed state; The real-time ambient temperature is compared with the first temperature threshold and the second temperature threshold respectively. When the real-time ambient temperature is greater than the first temperature threshold, the air-conditioning compressor is in a first temperature state; when the real-time ambient temperature is less than the second temperature threshold, the air-conditioning compressor is in a second temperature state.

5. The air-conditioning compressor overheat protection method according to claim 4, characterized in that: When the wind speed state and the temperature state meet a preset second air-conditioning system state condition, obtaining an operating pressure change value of the air-conditioning system per unit time, and determining that the air-conditioning system meets the critical overheating fault condition if the operating pressure change value is greater than or equal to a preset operating pressure change threshold, includes: When it is determined that the air-conditioning compressor is in the first temperature state, if the air-conditioning condenser is simultaneously in the first wind speed state, determining that the air-conditioning system meets the critical overheating fault condition when the obtained operating pressure change value is greater than or equal to a preset first pressure change threshold; and if the air-conditioning condenser is simultaneously in the second wind speed state, determining that the air-conditioning system meets the critical overheating fault condition when the obtained operating pressure change value is greater than or equal to a preset second pressure change threshold; When it is determined that the air-conditioning compressor is in the second temperature state, if the air-conditioning condenser is in the first wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset third pressure change threshold, it is determined that the air-conditioning system meets the critical condition for overheating fault; if the air-conditioning condenser is in the second wind speed state at the same time, then when the obtained operating pressure change value is greater than or equal to the preset fourth pressure change threshold, it is determined that the air-conditioning system meets the critical condition for overheating fault.

6. The air-conditioning compressor overheat protection method according to any one of claims 1 to 5, characterized in that: When it is determined that the air conditioning system meets the critical overheating fault condition, performing an overheating protection operation on the air conditioning compressor includes: When the air conditioning system meets the critical overheat fault condition, a power reduction instruction is sent to the target controller; wherein the target controller is configured to perform a parameter adjustment operation on the air conditioning compressor according to the power reduction instruction; or, When the air-conditioning system meets the critical condition for overheating fault, a shutdown instruction is sent to the air-conditioning compressor; wherein the air-conditioning compressor is configured to stop working according to the shutdown instruction.

7. An air-conditioning compressor overheat protection system, characterized in that: The system comprises: a condition judgment module, configured to obtain real-time operating data of the air-conditioning system and determine whether the air-conditioning system meets a critical overheating fault condition based on the real-time operating data; The adjustment module is configured to perform an overheat protection operation on the air-conditioning compressor when it is determined that the air-conditioning system meets the critical overheat fault condition.

8. An excavator, characterized in that: include: Air conditioning compressor; A controller, wherein the controller is used to execute the air-conditioning compressor overheating protection method according to any one of claims 1 to 6.

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