Air conditioner compressor overheating protection method and system and excavator

Abstract

The invention relates to the technical field of air conditioner compressors, and discloses an air conditioner compressor overheating protection method and system and an excavator. The method comprises the steps that real-time working data of an air conditioner system are obtained, and whether the air conditioner system meets overheating fault critical conditions or not is judged according to the real-time working data; and when it is judged that the air conditioning system meets the overheating fault critical condition, overheating protection operation is carried out on an air conditioner compressor. Therefore, the fault caused by overheating of the air conditioner compressor can be effectively avoided, meanwhile, after the overheating protection operation on the air conditioner compressor is triggered through the overheating protection method, the air conditioner compressor can be reused without extra maintenance, and therefore the sustainability and efficiency of refrigeration work of the air conditioner system can be improved, and the service life of the air conditioner system is prolonged. The air conditioning system can maintain efficient refrigeration work on the premise that an air conditioning compressor does not have an overheating fault.

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 actual operation, the design of the thermal fuse is to achieve overheat protection by melting when the air-conditioning compressor is working abnormally, and the design of the rubber suction cup is also to achieve overheat protection by melting the rubber suction cup when the air-conditioning compressor is working abnormally. That is, once the current overheat protection scheme is triggered, the air-conditioning compressor cannot be used again before the clutch of the air-conditioning compressor is replaced with a new thermal fuse or rubber suction cup, and the maintenance of the clutch of the air-conditioning compressor takes too much time, resulting in low work efficiency. Therefore, how to ensure that the air-conditioning compressor can maintain efficient cooling work while ensuring that the air-conditioning compressor can be protected from overheating has become an urgent problem to be solved. 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 can 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 an air-conditioning compressor overheat protection method, 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 according to 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 implementation, in the first aspect of the present invention, the real-time working 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 judging whether the air conditioning system meets the critical condition of overheating fault according to the real-time operating data, includes:

[0010] Acquire 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] Determine the pressure state of the air-conditioning system according to a preset operating pressure threshold and the real-time operating pressure, determine the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and determine the temperature state of the air-conditioning compressor according to 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 implementation, 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 step of determining 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 includes:

[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] The real-time oncoming wind speed is compared with the oncoming wind speed threshold, when the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioning condenser is in a first wind speed state, and when the real-time oncoming wind speed is greater than or equal to the oncoming wind 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, in the first aspect of the present invention, the running duration threshold includes a first duration threshold and a second duration threshold;

[0019] 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, and if the state operation time exceeds the preset operation time threshold, determine that the air conditioning system meets the overheating fault critical condition, including:

[0020] When it is determined that the state condition of the first air conditioning system 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, start timing and record the state operation time, and if the state operation time exceeds a preset first time threshold, determine that the air conditioning system meets the overheating fault critical condition;

[0021] When it is determined that the state condition of the first air-conditioning system 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, start timing and record the state operation time. 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 fault.

[0022] As an optional implementation, in the first aspect of the present invention, the real-time working 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 judging whether the air conditioning system meets the critical condition of overheating fault according to the real-time operating data, includes:

[0024] Acquire 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;

[0025] Determine the wind speed state of the air conditioner condenser according to a preset headwind speed threshold and the real-time headwind speed, and determine the temperature state of the air conditioner 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 in 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 implementation, 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 the preset headwind speed threshold and the real-time headwind speed, and the determining of the temperature state of the air-conditioning compressor according to the preset ambient temperature threshold and the real-time ambient temperature, include:

[0029] The real-time oncoming wind speed is compared with the oncoming wind speed threshold, when the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioning condenser is in a first wind speed state, and when the real-time oncoming wind speed is greater than or equal to the oncoming wind 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 implementation, in the first aspect of the present invention, when the wind speed state and the temperature state meet the preset second air-conditioning system state condition, obtaining the operating pressure change value of the air-conditioning system within a unit time, 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 the overheating fault critical condition includes:

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

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

[0035] 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 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 used 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, used to obtain real-time working 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 working data;

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

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

[0042] The specific manner in which the condition judgment module obtains the real-time working 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 working data includes:

[0043] Acquire 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] Determine the pressure state of the air-conditioning system according to a preset operating pressure threshold and the real-time operating pressure, determine the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and determine the temperature state of the air-conditioning compressor according to 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 implementation, 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 step of determining 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 includes:

[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] The real-time oncoming wind speed is compared with the oncoming wind speed threshold, when the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioning condenser is in a first wind speed state, and when the real-time oncoming wind speed is greater than or equal to the oncoming wind 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 duration threshold includes a first duration threshold and a second duration threshold;

[0052] 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, and if the state operation time exceeds the preset operation time threshold, determine that the air conditioning system meets the overheating fault critical condition, including:

[0053] When it is determined that the state condition of the first air conditioning system 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, start timing and record the state operation time, and if the state operation time exceeds a preset first time threshold, determine that the air conditioning system meets the overheating fault critical condition;

[0054] When it is determined that the state condition of the first air-conditioning system 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, start timing and record the state operation time. 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 fault.

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

[0056] The specific manner in which the condition judgment module obtains the real-time working 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 working data includes:

[0057] Acquire 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;

[0058] Determine the wind speed state of the air conditioner condenser according to a preset headwind speed threshold and the real-time headwind speed, and determine the temperature state of the air conditioner 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 in 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 the preset headwind speed threshold and the real-time headwind speed, and the determining of the temperature state of the air-conditioning compressor according to the preset ambient temperature threshold and the real-time ambient temperature, include:

[0062] The real-time oncoming wind speed is compared with the oncoming wind speed threshold, when the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioning condenser is in a first wind speed state, and when the real-time oncoming wind speed is greater than or equal to the oncoming wind 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 implementation, in the second aspect of the present invention, when the wind speed state and the temperature state meet the preset second air-conditioning system state condition, obtaining the operating pressure change value of the air-conditioning system within a unit time, 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 the overheating fault critical condition includes:

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

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

[0068] 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 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 used 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, wherein the controller is used to execute the air-conditioning compressor overheating protection method described in the first aspect embodiment above.

[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 faults by acquiring real-time working data of the air-conditioning system, and performs an overheating protection operation on the air-conditioning compressor when the air-conditioning system meets the critical conditions for overheating faults, thereby effectively avoiding faults 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 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 refrigeration work of the air-conditioning compressor, and enabling the air-conditioning compressor to maintain efficient refrigeration work without the occurrence of overheating faults.

[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 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 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 air-conditioning compressor is subjected to overheating protection operation, 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. 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. 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 It is a flow chart of an air-conditioning compressor overheat protection method disclosed in an embodiment of the present invention;

[0080] Figure 2 It is a structural schematic diagram of an air-conditioning compressor overheat protection system disclosed in an embodiment of the present invention.

[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 scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0084] The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, device, product or end including a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or ends.

[0085] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood 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 actual operation, the design of the thermal fuse is to achieve overheat protection by melting when the air-conditioning compressor is working abnormally, and the design of the rubber suction cup is also to achieve overheat protection by melting the rubber suction cup when the air-conditioning compressor is working abnormally. That is, once the current overheat protection scheme is triggered, the air-conditioning compressor cannot be used again before the clutch of the air-conditioning compressor is replaced with a new thermal fuse or rubber suction cup, and the maintenance of the clutch of the air-conditioning compressor takes too much time, resulting in low work efficiency. Therefore, how to ensure that the air-conditioning system maintains efficient cooling work while ensuring that the air-conditioning compressor can be protected from overheating has become an urgent problem to be solved.

[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 refrigeration work of the air-conditioning system, and can enable the air-conditioning system to maintain efficient refrigeration work without the air-conditioning compressor overheating failure.

[0089] Embodiment 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 the embodiment of the present invention, the air conditioning compressor can be used in scenes such as the operating room of a working machine such as an excavator, the interior of a building, etc., to cool down the above scenes. Furthermore, the real-time working data is one or more real-time data of the air conditioning compressor when performing cooling work, and the real-time working data of the air conditioning system can have a direct or indirect impact on the working temperature of the air conditioning compressor.

[0093] Furthermore, the critical condition for overheating fault can be obtained in advance by measuring the working conditions of the air-conditioning compressor in the corresponding scene, and the critical condition for overheating fault can reflect whether the influence of the real-time working data on the working temperature of the air-conditioning compressor has reached the critical value of overheating fault. When the real-time working data of the air-conditioning system indicates that the influence on the working temperature of the air-conditioning compressor has reached the critical value, it is judged that the air-conditioning system meets the critical condition for overheating fault. On the contrary, when the real-time working data of the air-conditioning system indicates that the influence on the working temperature of the air-conditioning compressor has not reached the critical value, it is judged that the air-conditioning compressor does not meet the critical condition for overheating fault.

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

[0095] In the embodiment of the present invention, when the acquired real-time working data determines that the air-conditioning system meets the critical condition of overheating fault, it indicates that the air-conditioning system has reached the critical condition of overheating fault, and the air-conditioning system cannot continue to maintain the current working state, otherwise it will cause the air-conditioning compressor to overheat and fail, and cannot be restored to use. At this time, the overheating protection operation is performed on the air-conditioning compressor, and the corresponding fault handling solution is given to the air-conditioning compressor, so as to ensure that the air-conditioning compressor will not overheat and fail, thereby realizing the overheating protection of the air-conditioning compressor.

[0096] It can be seen that the air-conditioning compressor overheat protection method of the present invention determines whether the air-conditioning system meets the critical conditions for overheating faults by acquiring the 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 faults, 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, so it can improve the sustainability and efficiency of the refrigeration work of the air-conditioning system, so that the air-conditioning system can maintain efficient refrigeration work without 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 judging whether the air conditioning system meets the critical condition of overheating fault according to the real-time operating data may include the following steps:

[0098] Obtaining the real-time operating pressure of the air-conditioning system, the real-time wind 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 according to the preset operating pressure threshold and the real-time operating pressure, the wind speed state of the air-conditioning condenser is determined according to the preset headwind speed threshold and the real-time headwind speed, and the temperature state of the air-conditioning compressor is determined according to 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] The above three working states are judged. When the pressure state, wind speed state and temperature state meet the preset first air conditioning system state condition, it indicates that the air conditioning system may be temporarily at the critical point of overheating failure, or may be about to break the critical point of overheating failure. Therefore, at this time, it is necessary to record the state operation time that meets the first air conditioning system state condition for further judgment.

[0104] If the state operation time has not reached the preset operation time threshold, the working 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 fault, and the working temperature of the air conditioning compressor will gradually decrease thereafter, and will not cause overheating fault, so there is no need for overheating protection. If the state operation time exceeds the preset operation time threshold, it indicates that the air conditioning system is about to break through the critical point of overheating fault, that is, if the current operation state is maintained, the working temperature of the air conditioning compressor will exceed the critical point and cause overheating fault, so it is determined that the air conditioning system meets the critical condition of overheating fault at this time.

[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 according to the preset operating pressure threshold and the real-time operating pressure, determining the wind speed state of the air-conditioning condenser according to the preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air-conditioning compressor according to the preset ambient temperature threshold and the real-time ambient temperature may include the following steps:

[0107] The real-time operating pressure is compared 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 the first pressure state; 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 the second pressure state;

[0108] The real-time oncoming wind speed is compared with the oncoming wind speed threshold, when the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioning condenser is in a first wind speed state, when the real-time oncoming wind speed is greater than or equal to the oncoming wind 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, that is, 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, that is, P1 ≤ P < P2, the air-conditioning system is in the second pressure state.

[0112] Let the acquired 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-conditioning condenser according to the numerical magnitude 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-conditioning 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-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, that is, 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, that is, 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, real-time oncoming wind speed, and 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 operation duration threshold includes a first duration threshold and a second duration threshold. 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 duration. If the state operation duration exceeds the preset operation duration threshold, it is determined that the air conditioning system meets the critical condition of overheating fault, which may include the following steps:

[0116] 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 the air conditioning system is in the first pressure state, the second wind speed state and the first temperature state, start timing and record the state operation time, if the state operation time exceeds the 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 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 operation duration threshold can be specifically divided into a first duration threshold T1 and a second duration threshold T2. It can be understood that the first duration threshold T1 and the second duration threshold T2 are obtained by experimentally measuring the high temperature working conditions of the air-conditioning system in the corresponding scene in advance, and the monitoring duration thresholds required for different air-conditioning systems are different, so they need to be set according to 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, t>t1, start recording the state operation time T that meets the current state. If the state operation time of the air-conditioning system maintaining the current state has not reached the first time threshold T1, the working 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 fault and will not cause overheating fault, so there is no need for overheating protection; if the state operation time T of the air-conditioning system maintaining the current state exceeds the first time threshold T1, it indicates that the air-conditioning system is about to break through the critical point of overheating fault, so it is determined that the air-conditioning system meets the critical condition of overheating fault at this time.

[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, the results of the above magnitude relationship comparison are P1≤P<P2, V<V0, t<t2, or P1≤P<P2, V≥V0, t<t2, start recording the state operation duration T that meets 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 meets 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 meets 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 met 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 alternative embodiment can also specifically determine whether the air-conditioning system meets 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 alternative 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 meets 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 in 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 failure are determined.

[0128] Furthermore, after obtaining the real-time headwind speed and the 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 working temperature of the air-conditioning compressor. At this time, the operating pressure change value of the air-conditioning system in 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 an excessively high operating temperature increase, that is, it will not cause an overheating fault, so there is no need for overheating protection. 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 increase to the critical level of overheating fault. If the operating pressure change continues to increase, it will cause an overheating fault of the air-conditioning compressor in the air-conditioning system. Therefore, it is determined that the air-conditioning system meets the critical condition of overheating fault at this time.

[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 the 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 acquired 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, then 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, then the air conditioner condenser is in the second wind speed state.

[0137] 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 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, then 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, then 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 conditioning system.

[0139] In an optional embodiment, 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 in unit time is obtained, and 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, which may include the following steps:

[0140] When it is determined that the air-conditioning compressor is in the first temperature state, if the air-conditioning condenser is in the first wind speed state at the same time, it is determined that the air-conditioning system meets the critical condition of overheating fault when the obtained operating pressure change value is greater than or equal to the preset first pressure change threshold value, and if the air-conditioning condenser is in the second wind speed state at the same time, it is determined that the air-conditioning system meets the critical condition of overheating fault when the obtained operating pressure change value is greater than or equal to the 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 magnitude comparison is V<V0、t> At t1, the operating pressure change value ΔP of the air-conditioning system in unit time is obtained. If the operating pressure change value ΔP is less than the preset first pressure change threshold ΔP1, it indicates that the operating pressure change of the air-conditioning system will not cause an excessively high operating temperature increase, that is, it will not cause an overheating fault, so there is no need for overheating protection. If the operating pressure change value ΔP is greater than or equal to the preset first pressure change threshold ΔP1, it indicates that the operating pressure change of the air-conditioning system will cause the operating temperature of the air-conditioning compressor to increase to the critical value of the overheating fault. At this time, it is determined that the air-conditioning system meets the critical condition of the overheating fault.

[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 fault, so there is no need for overheat protection. 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 overheat fault critical level. At this time, it is determined that the air-conditioning system meets the overheat fault 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 fault, so there is no need for overheat protection. 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 overheat fault critical level. At this time, it is determined that the air-conditioning system meets the overheat fault 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 fault, so there is no need for overheat protection. 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 overheat fault critical level. At this time, it is determined that the air-conditioning system meets the overheat fault critical condition.

[0146] It can be understood that when the results of the four working states obtained by comparing the magnitudes of the above real-time working data, that is, V<V0, t>t1, V≥V0, t>t1, V<V0, t<t2, or V≥V0, t<t2, after determining that the overheat fault critical condition is met 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 situation of the overheat critical alarm of the air-conditioning compressor.

[0147] 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 state conditions through different pressure change thresholds, thereby further improving the accuracy of determining whether the air-conditioning compressor is at the critical overheating fault condition.

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

[0149] When the air conditioning system meets the critical condition of overheating fault, a power reduction instruction is sent to the target controller; wherein the target controller is used to perform parameter adjustment operation on the air conditioning compressor according to the power reduction instruction;

[0150] or,

[0151] When the air-conditioning system meets the critical condition of overheating fault, a shutdown command is sent to the air-conditioning compressor; wherein the air-conditioning compressor is used to stop working according to the shutdown command.

[0152] In this optional embodiment, after determining that the air-conditioning system meets the critical condition for overheating fault, the air-conditioning compressor needs to be protected from overheating.

[0153] One of the overheat protection methods is to actively reduce the working power of the air-conditioning compressor to delay the protection of the air-conditioning compressor. For example, when the air-conditioning system meets the critical condition of overheating fault, it sends data to the vehicle controller of the working equipment to request speed increase. The vehicle controller then increases the air-conditioning condenser's oncoming wind speed by increasing the electronic fan, silicone oil clutch fan or engine speed, thereby reducing the system's working pressure and power to prevent the compressor from overheating.

[0154] Another overheat protection method is to stop the air-conditioning compressor from continuing to work to ensure that the air-conditioning compressor will not overheat and fail, and to check the air-conditioning compressor during the shutdown period. For example, when the air-conditioning compressor reaches the critical point of overheat failure, or when the air-conditioning compressor is still at the critical point of overheat failure after the above-mentioned method of reducing the working power is adopted but the electronic fan, silicone oil clutch fan or engine speed is increased to the limit, the air-conditioning compressor is turned off, and the overheating alarm information and the corresponding fault handling plan are output through the display, and the air-conditioning compressor is checked 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] Embodiment 2

[0157] See also Figure 2 , Figure 2 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 determination module 201 and an adjustment module 202, wherein:

[0158] The condition judgment module 201 is used to obtain the real-time working 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 working data;

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

[0160] visible, Figure 2 The described system can obtain the 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 without the premise that the air-conditioning compressor will not have an 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 the specific method of judging whether the air-conditioning system meets the critical condition of overheating fault according to the real-time operating data includes:

[0162] Obtaining the real-time operating pressure of the air-conditioning system, the real-time wind 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 according to the preset operating pressure threshold and the real-time operating pressure, the wind speed state of the air-conditioning condenser is determined according to the preset headwind speed threshold and the real-time headwind speed, and the temperature state of the air-conditioning compressor is determined according to 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. The specific methods of determining the pressure state of the air-conditioning system according to the preset operating pressure threshold and the real-time operating pressure, determining the wind speed state of the air-conditioning condenser according to the preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air-conditioning compressor according to the preset ambient temperature threshold and the real-time ambient temperature include:

[0167] The real-time operating pressure is compared 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 the first pressure state; 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 the second pressure state;

[0168] The real-time oncoming wind speed is compared with the oncoming wind speed threshold, when the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioning condenser is in a first wind speed state, when the real-time oncoming wind speed is greater than or equal to the oncoming wind 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 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 operation duration threshold includes a first duration threshold and a second duration threshold. 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 duration. If the state operation duration exceeds the preset operation duration threshold, the specific method of determining that the air conditioning system meets the critical condition of overheating failure includes:

[0172] 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 the air conditioning system is in the first pressure state, the second wind speed state and the first temperature state, start timing and record the state operation time, if the state operation time exceeds the 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 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 fault under different working conditions, thereby further improving the accuracy of determining whether the air-conditioning system is at the critical condition of overheating fault.

[0175] In an optional embodiment, the real-time working data includes real-time headwind speed, real-time ambient temperature and operating pressure change value. The condition judgment module obtains the real-time working data of the air-conditioning system, and the specific method of judging whether the air-conditioning system meets the critical condition of overheating fault according to the real-time working data 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 according to the preset headwind speed threshold and the real-time headwind speed, and the temperature state of the air conditioner compressor is determined according to 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 in 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 the 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. The specific method of determining the wind speed state of the air conditioner condenser according to the preset headwind speed threshold and the real-time headwind speed, and determining the temperature state of the air conditioner compressor according to the preset ambient temperature threshold and the real-time ambient temperature includes:

[0181] The real-time oncoming wind speed is compared with the oncoming wind speed threshold, when the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioning condenser is in a first wind speed state, when the real-time oncoming wind speed is greater than or equal to the oncoming wind 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 magnitude relationship between the real-time headwind speed and the real-time ambient temperature and the corresponding thresholds, thereby improving the accuracy of judging the working state of the air-conditioning system.

[0184] In another optional embodiment, 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 in unit time is obtained, and if the operating pressure change value is greater than or equal to the preset operating pressure change threshold, the specific method of determining that the air conditioning system meets the critical condition of overheating fault includes:

[0185] When it is determined that the air-conditioning compressor is in the first temperature state, if the air-conditioning condenser is in the first wind speed state at the same time, it is determined that the air-conditioning system meets the critical condition of overheating fault when the obtained operating pressure change value is greater than or equal to the preset first pressure change threshold value, and if the air-conditioning condenser is in the second wind speed state at the same time, it is determined that the air-conditioning system meets the critical condition of overheating fault when the obtained operating pressure change value is greater than or equal to the 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 state 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 yet another optional embodiment, when the adjustment module determines that the air conditioning system meets the critical condition of overheating fault, the specific manner of performing the overheating protection operation on the air conditioning compressor includes:

[0189] When the air conditioning system meets the critical condition of overheating fault, a power reduction instruction is sent to the target controller; wherein the target controller is used to perform parameter adjustment operation 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 command is sent to the air-conditioning compressor; wherein the air-conditioning compressor is used to stop working according to the shutdown command.

[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] Embodiment 3

[0194] The 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 air-conditioning compressor is operated with overheating protection, 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 only illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.

[0197] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution can be essentially or partly contributed to the prior art in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, and the storage medium includes 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 rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, a magnetic disk storage, a magnetic tape storage, or any other computer-readable medium that can be used to carry or store 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, which are only used to illustrate the technical solution of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art 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 according to the real-time operating data; 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.

2. The air-conditioning compressor overheat protection method according to claim 1, characterized in that: 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 judging whether the air conditioning system meets the critical condition of overheating fault according to the real-time operating data, includes: Acquire 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; Determine the pressure state of the air-conditioning system according to a preset operating pressure threshold and the real-time operating pressure, determine the wind speed state of the air-conditioning condenser according to a preset headwind speed threshold and the real-time headwind speed, and determine the temperature state of the air-conditioning compressor according to a preset ambient temperature threshold and the real-time ambient temperature; 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.

3. The air-conditioning compressor overheat protection method according to claim 2, characterized in that: 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 step of determining 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 includes: 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; The real-time oncoming wind speed is compared with the oncoming wind speed threshold, when the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioning condenser is in a first wind speed state, and when the real-time oncoming wind speed is greater than or equal to the oncoming wind 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.

4. The air-conditioning compressor overheat protection method according to claim 3, 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 the preset first air conditioning system state condition, start timing and record the state operation time, and if the state operation time exceeds the preset operation time threshold, determine that the air conditioning system meets the overheating fault critical condition, including: When it is determined that the state condition of the first air conditioning system 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, start timing and record the state operation time, and if the state operation time exceeds a preset first time threshold, determine that the air conditioning system meets the overheating fault critical condition; When it is determined that the state condition of the first air-conditioning system 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, start timing and record the state operation time. 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 fault.

5. 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 judging whether the air conditioning system meets the critical condition of overheating fault according to the real-time operating data, includes: Acquire 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; Determine the wind speed state of the air conditioner condenser according to a preset headwind speed threshold and the real-time headwind speed, and determine the temperature state of the air conditioner 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 in 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.

6. The air-conditioning compressor overheat protection method according to claim 5, 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 the preset headwind speed threshold and the real-time headwind speed, and the determining of the temperature state of the air-conditioning compressor according to the preset ambient temperature threshold and the real-time ambient temperature, include: The real-time oncoming wind speed is compared with the oncoming wind speed threshold, when the real-time oncoming wind speed is less than the oncoming wind speed threshold, the air conditioning condenser is in a first wind speed state, and when the real-time oncoming wind speed is greater than or equal to the oncoming wind 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.

7. The air-conditioning compressor overheat protection method according to claim 6, characterized in that: When the wind speed state and the temperature state meet the preset second air conditioning system state condition, obtaining the operating pressure change value of the air conditioning system within a 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 the overheating fault critical condition, includes: When it is determined that the air-conditioning compressor is in the first temperature state, if the air-conditioning condenser is in the first wind speed state at the same time, it is determined that the air-conditioning system meets the critical condition of overheating fault when the obtained operating pressure change value is greater than or equal to the preset first pressure change threshold value; if the air-conditioning condenser is in the second wind speed state at the same time, it is determined that the air-conditioning system meets the critical condition of overheating fault when the obtained operating pressure change value is greater than or equal to the preset second pressure change threshold value; 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.

8. The air-conditioning compressor overheat protection method according to any one of claims 1 to 7, characterized in that: When it is determined that the air conditioning system meets the critical condition for overheating fault, performing an overheating protection operation on the air conditioning compressor includes: 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 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 used to stop working according to the shutdown instruction.

9. An air conditioning compressor overheat protection system, characterized in that: The system comprises: A condition judgment module, used to obtain real-time working 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 working data; The adjustment module is used to perform an overheat protection operation on the air-conditioning compressor when it is determined that the air-conditioning system meets the overheat fault critical condition.

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

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