Air conditioner compressor protection method and device and engineering machinery

Abstract

The invention provides a protection method and device for an air conditioner compressor and engineering machinery, and is applied to the technical field of vehicle control, the method comprises the following steps: acquiring the duration of stopping the operation of the air conditioner compressor, and when the duration of stopping the operation of the air conditioner compressor is greater than or equal to a first preset duration, generating first prompt information, the first prompt information is used for reminding a user to confirm whether the compressor enters an oil return mode or not, and when first confirmation information indicating that the compressor enters the oil return mode is received, the gear of the engine is controlled to be a preset gear and is kept at the preset gear within a second preset duration, and the compressor is controlled to operate for the second preset duration. Whether the compressor enters the oil return mode or not is determined according to the running stopping duration of the air conditioner compressor, and when it is determined that the compressor enters the oil return mode, oil return of the compressor is achieved, internal abrasion of the compressor is reduced, and an air conditioner system is protected by controlling the gear of the engine and running of the compressor.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to an air-conditioning compressor protection method, device, and engineering machinery. Background Art

[0002] According to the working nature of construction machinery, after starting, the construction machinery will immediately adjust the engine gear to enter the working state. In this state, the engine speed is high, and the compressor with the engine belt drive as the power source will also enter high-speed operation. However, for those construction machinery that have not been used for a long time, if the compressor suddenly enters the high-speed operation state from the static state, the lack of lubricating oil inside the compressor will cause the piston and the cavity to dry grind, which is very likely to cause internal wear of the compressor, indirectly leading to pollution and blockage of the air conditioning system pipeline. In severe cases, the entire air conditioning system needs to be replaced. Therefore, increasing the protection of the air conditioning compressor is crucial to the overall operation of the air conditioning system in construction machinery.

[0003] The existing air conditioning compressor protection method usually controls the compressor to return oil based on the difference between the current condensing temperature of the air conditioner and the temperature at the bottom of the compressor, the current operating frequency of the compressor, and the current outdoor temperature to ensure the stable operation of the compressor. However, this method is applicable to household air conditioning systems, and the oil return can only be performed after the air conditioning system has been turned on for a preset time. Therefore, it is not applicable to air conditioning compressors in construction machinery. Summary of the invention

[0004] In view of this, the present application is dedicated to providing an air-conditioning compressor protection method, device, and engineering machinery. The present application confirms whether the compressor enters the oil return mode according to the length of time the air-conditioning compressor stops running, and when it is confirmed that it enters the oil return mode, it controls the gear position of the engine and the operation of the compressor. This effectively solves the problem that the existing air-conditioning compressor protection method needs to meet the preset length of time that the air-conditioning system is turned on and running before oil return can be performed, and is not suitable for air-conditioning compressors in engineering machinery.

[0005] In a first aspect, an embodiment of the present application provides an air conditioner compressor protection method, comprising:

[0006] Get the duration of air conditioner compressor stopping operation;

[0007] When the air-conditioning compressor stops running for a period of time greater than or equal to a first preset period of time, generating a first prompt message, wherein the first prompt message is used to remind the user to confirm whether the compressor enters the oil return mode;

[0008] When the first confirmation information indicating that the compressor has entered the oil return mode is received, the gear of the engine is controlled to be a preset gear and maintained at the preset gear within a second preset time, and the compressor is controlled to operate and operate for the second preset time.

[0009] Optionally, the air conditioner compressor protection method provided in the first aspect of the present application further includes:

[0010] When the second confirmation information indicating that the compressor refuses to enter the oil return mode is received, a second prompt information is generated when the engine is started next time, and the second prompt information is used to remind the user to confirm whether the compressor enters the oil return mode.

[0011] Optionally, the air conditioner compressor protection method provided in the first aspect of the present application further includes:

[0012] Monitor the pressure value at the compressor outlet;

[0013] The operating state of the air conditioning system is controlled according to the pressure value at the compressor outlet.

[0014] Optionally, controlling the operating state of the air conditioning system according to the pressure value at the compressor outlet includes:

[0015] When the pressure value at the compressor outlet is less than or equal to the first preset pressure value, the compressor is connected to the first condenser, and the current air-conditioning system is in a single condensing operation state.

[0016] Optionally, the air conditioner compressor protection method provided in the first aspect of the present application further includes:

[0017] When the pressure value at the compressor outlet is greater than or equal to the second preset pressure value, the servo motor is controlled to rotate forward by a first preset angle, driving the second valve plate of the three-way valve to rotate forward by a second preset angle, and the compressor is connected to the first condenser and the second condenser at the same time, so that the air-conditioning system enters a dual condensing operation state.

[0018] Optionally, the air conditioner compressor protection method provided in the first aspect of the present application further includes:

[0019] Obtain the first real-time pressure value of the compressor outlet after the compressor is connected to the second condenser. When the first real-time pressure value is less than the third preset pressure value, control the servo motor to reverse the first preset angle, drive the second valve plate of the three-way valve to reverse the second preset angle, and disconnect the compressor from the second condenser to restore the air-conditioning system to the single condensing operation state.

[0020] Optionally, in the air-conditioning compressor protection method provided in the first aspect of the present application, the third preset pressure value is less than half of the second preset pressure value.

[0021] Optionally, obtaining the duration of the air-conditioning compressor stopping operation includes:

[0022] Get the time when the air conditioner compressor stopped running last time;

[0023] Get the current start time of the engine;

[0024] The duration of the air conditioning compressor stopping operation is calculated based on the current start time of the engine and the time when the air conditioning compressor stopped operation most recently.

[0025] In a second aspect, an embodiment of the present application provides an air conditioner compressor protection device, comprising:

[0026] A data acquisition module, the data acquisition module is used to obtain the duration of the air-conditioning compressor stopping operation;

[0027] A confirmation module, the confirmation module is used to generate a first prompt message when the air-conditioning compressor stops running for a time period greater than or equal to a first preset time period, the first prompt message is used to remind the user to confirm whether the compressor enters the oil return mode;

[0028] A control module, wherein the control module is used to control the gear of the engine to a preset gear and maintain it at the preset gear for a second preset time when receiving a first confirmation message indicating that the compressor has entered an oil return mode, and to control the compressor to operate for a second preset time.

[0029] In a third aspect, an embodiment of the present application provides an engineering machine, including:

[0030] An air-conditioning compressor and the air-conditioning compressor protection device described in the second aspect.

[0031] Based on the above content, the present application provides an air-conditioning compressor protection method, which obtains the duration of the air-conditioning compressor stopping operation, and generates a first prompt message for reminding the user to confirm whether the compressor enters the oil return mode when the duration of the air-conditioning compressor stopping operation is greater than the first preset duration. When the first confirmation message indicating that the compressor enters the oil return mode is received, the gear position of the engine is controlled to be a preset gear position, and is maintained at the preset gear position within a second preset duration, and the compressor is controlled to operate and operate for the second preset duration. The present application confirms whether the compressor enters the oil return mode based on the duration of the air-conditioning compressor stopping operation. When it is confirmed that the compressor enters the oil return mode, the oil return of the compressor is achieved by controlling the gear position of the engine and the operation of the compressor, thereby reducing the internal wear of the compressor and protecting the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1A schematic diagram of a flow chart of an air-conditioning compressor protection method provided in an embodiment of the present application;

[0034] Figure 2 A flowchart of a method for obtaining the duration of air-conditioning compressor stop operation provided in an embodiment of the present application;

[0035] Figure 3 A flow chart of another air-conditioning compressor protection method provided in an embodiment of the present application;

[0036] Figure 4 A flow chart of another air-conditioning compressor protection method provided in an embodiment of the present application;

[0037] Figure 5 A flow chart of another air-conditioning compressor protection method provided in an embodiment of the present application;

[0038] Figure 6 A flow chart of another air-conditioning compressor protection method provided in an embodiment of the present application;

[0039] Figure 7 A flow chart of another air-conditioning compressor protection method provided in an embodiment of the present application;

[0040] Figure 8 A schematic structural diagram of an air-conditioning compressor protection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this specification shall have the common meanings understood by persons with ordinary skills in the field to which this specification belongs. The words "first", "second" and similar words used in the embodiments of this specification do not indicate any order, quantity or importance, but are only used to avoid confusion of constituent elements.

[0042] Unless the context requires otherwise, throughout the specification, "plurality" means "at least two", and "including" is interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the specification. The schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0043] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0044] Application Overview

[0045] Air conditioning systems are commonly used in construction machinery. The main purpose of air conditioning systems in construction machinery is to adjust the temperature, humidity and air cleanliness in the cab, thereby providing a comfortable environment for the driver. The air conditioning system can not only improve the performance of construction machinery, but also indirectly improve the work efficiency of the driver. The air conditioning system of construction machinery is generally divided into a refrigeration system and a heating system, which is mainly composed of an evaporator, a condenser, a compressor, a liquid storage dryer, and various connecting pipes and joints.

[0046] Most construction machinery will immediately adjust the engine gear to enter the working state after starting. The engine speed in the working state is relatively high, and the compressor driven by the engine belt drive will also enter high-speed operation. However, for those construction machinery that have not been used for a long time, if the compressor suddenly enters the high-speed operation state from the static state, the lack of lubricating oil inside the compressor will cause the piston and the cavity to dry grind, which is very likely to cause internal wear of the compressor, indirectly leading to various problems in the air conditioning system. In severe cases, the entire air conditioning system needs to be replaced. Therefore, increasing the protection of the air conditioning compressor is crucial to the overall operation of the air conditioning system.

[0047] The protective measure for the air-conditioning compressor can be to return oil to the compressor. Specifically, the compressor is controlled to return oil according to the difference between the current condensing temperature of the air conditioner and the temperature at the bottom of the compressor, the current operating frequency of the compressor, and the current outdoor temperature to ensure the stable operation of the compressor. However, this method is applicable to household air-conditioning systems, and the air-conditioning system needs to be started and run for a preset time before oil return can be performed. Therefore, it is not applicable to air-conditioning compressors in construction machinery.

[0048] In order to solve the above technical problems, the present application provides an air-conditioning compressor protection method, device, and engineering machinery. The obtained duration of the air-conditioning compressor stopping operation is compared with the first preset duration. When the duration of the air-conditioning compressor stopping operation is greater than or equal to the first preset duration, a first prompt message is generated to remind the user to confirm whether the compressor enters the oil return mode, and the oil return mode is entered. When the first confirmation message indicating that the compressor enters the oil return mode is received, the oil return mode is entered, the gear position of the engine is controlled to be the preset gear position, and it is maintained at the preset gear position within the second preset duration, and the compressor is controlled to operate, and it operates for the second preset duration. Compared with the prior art, the compressor oil return can be achieved without starting the engineering machinery air-conditioning system, which can reduce the internal wear of the compressor and protect the air-conditioning system.

[0049] The air conditioner compressor protection method provided in the embodiments of this specification will be exemplarily described below with reference to the accompanying drawings.

[0050] Exemplary Methods

[0051] like Figure 1 As shown, in this exemplary embodiment, a method for protecting an air conditioner compressor is provided, and the method may include the following steps:

[0052] S100: Obtaining the duration of the air conditioner compressor stopping operation.

[0053] S200: When the duration of the air-conditioning compressor stopping operation is greater than or equal to a first preset duration, a first prompt message is generated, and the first prompt message is used to remind the user to confirm whether the compressor enters the oil return mode.

[0054] A first preset time is preset, for example, the first preset time can be set to 30 days. Of course, the first preset time can also be set to other values ​​according to specific circumstances. The obtained air-conditioning compressor stop operation time is compared with the first preset time. Assuming that the air-conditioning compressor stop operation time is ΔT, the first preset time is T s , when the air conditioning compressor stops running for a period greater than or equal to the first preset period, that is, ΔT>T s Or ΔT=T s, a first prompt message is generated, and the first prompt message is used to remind the user to confirm whether the compressor enters the oil return mode. Specifically, the first prompt message may include text prompt content displayed on the display interface. The display interface may be a vehicle-mounted display device. When adjusted by buttons, corresponding options, menus, etc. are displayed on the display device screen, similar to the menu format of a computer monitor. The display interface may be a touch-sensitive device, and the user selects the corresponding options by touch. The display interface may also be other human-computer interaction interfaces, which are not specifically limited here. For example, the prompt content may be whether to confirm that the compressor enters the oil return mode, with options for confirmation or rejection. In addition, the first prompt message may also include sound prompt content on the speaker, for example, the speaker broadcasts whether it is confirmed that the compressor enters the oil return mode.

[0055] S300: When the first confirmation information indicating that the compressor has entered the oil return mode is received, the gear of the engine is controlled to be a preset gear and maintained at the preset gear within a second preset time, and the compressor is controlled to operate and operate for the second preset time.

[0056] In the present application, the user may be a driver of the construction machinery, a mechanical engineer, a test engineer, and other personnel related to the construction machinery, and no specific limitation is made here. When the user confirms whether to enter the oil return mode through any of the above display interfaces, that is, the user selects whether to agree that the compressor enters the oil return mode, at this time, the controller will receive confirmation information that the compressor enters the oil return mode. In order to distinguish different information, the information confirming that the compressor enters the oil return mode is defined as the first confirmation information, and the information refusing the compressor to enter the oil return mode is defined as the second confirmation information. When the user chooses to agree that the compressor enters the oil return mode, the controller receives the first confirmation information. At this time, the controller controls the gear of the engine to the preset gear and maintains the second preset time at the preset gear. At the same time, the controller controls the compressor to continue to operate for the second preset time. Generally, the preset gear is set to the lowest gear of the engine, and the second preset time is preset. For example, the second preset time can be set to 1 minute. Of course, the second preset time can also be set to other values ​​according to the specific situation.

[0057] In some embodiments of the present application, the duration of the air-conditioning compressor stopping operation is obtained. When the duration of the air-conditioning compressor stopping operation is greater than or equal to the first preset duration, a first prompt message is generated. The first prompt message is used to remind the user to confirm whether the compressor has entered the oil return mode. When the first confirmation message indicating that the compressor has entered the oil return mode is received, the gear position of the engine is controlled to be the preset gear position, and is maintained at the preset gear position within the second preset duration, and the compressor is controlled to operate and operate for the second preset duration. The present application confirms whether the compressor has entered the oil return mode according to the duration of the air-conditioning compressor stopping operation. When it is confirmed that the compressor has entered the oil return mode, the compressor oil return is achieved by controlling the gear position of the engine and the operation of the compressor. In the present application, it is not necessary to start the air-conditioning system. By controlling the gear position of the engine at a low gear position, the engine can be operated at a lower speed, and the compressor with the engine gear belt drive as the power source can also be operated at a lower speed, so that the compressor oil return can be completed, while reducing the internal wear of the compressor and protecting the air-conditioning system.

[0058] In some embodiments of the present application, Figure 2 As shown, the specific steps of obtaining the duration of the air-conditioning compressor stopping operation in S100 may include:

[0059] S101: Acquire the time when the air-conditioning compressor stopped running last time.

[0060] The controller records the time T1 when the air conditioner compressor stopped running most recently. The controller may be an air conditioner controller or other controller that can obtain the time when the air conditioner compressor stopped running. The air conditioner compressor stopped running specifically after cooling operation or after heating operation, which is not specifically limited here.

[0061] S102: Acquire the current start time of the engine.

[0062] The current start time of the engine is obtained through a controller, and the controller may be a vehicle controller or other controller that can obtain the engine start time.

[0063] S103: Calculate the duration of the air-conditioning compressor stopping operation according to the current start time of the engine and the time when the air-conditioning compressor stopped operation most recently.

[0064] In some embodiments, the air-conditioning controller records the time T1 when the air-conditioning compressor last stopped running, and sends the time T1 of the last stop running to the vehicle controller through CAN communication. Each time the engine is started, the vehicle controller obtains the current start time T2 of the engine, and calculates the difference between the current start time of the engine and the time when the air-conditioning compressor last stopped running, that is, T2-T1. According to the current start time of the engine and the time when the air-conditioning compressor last stopped running, the duration ΔT of the air-conditioning compressor stopping running is calculated. In the present application, the duration of the air-conditioning compressor stopping running is the difference between the current start time of the engine and the time when the air-conditioning compressor last stopped running, that is, ΔT=T2-T1.

[0065] In some embodiments of the present application, Figure 3 As shown, the air conditioning compressor protection method of the present application may also include:

[0066] S400: When a second confirmation message indicating that the compressor refuses to enter the oil return mode is received, a second prompt message is generated when the engine is started next time, and the second prompt message is used to remind the user to confirm whether the compressor enters the oil return mode.

[0067] Generally, when the user receives the prompt message to confirm whether the compressor enters the oil return mode, he will choose to confirm that the compressor enters the oil return mode. However, when the user is in an emergency, such as encountering extreme weather or force majeure of the engineering machinery that causes it to be unable to work or other situations that conflict with the work of the engineering machinery, the user can refuse the compressor to enter the oil return mode through the display interface. When the user chooses to refuse the compressor to enter the oil return mode, the controller receives the second confirmation message. At this time, the controller controls the display interface to no longer display the message reminding the user to confirm whether the compressor enters the oil return mode. Instead, the second prompt message is generated when the engine is started next time. The second prompt message is used to remind the user to confirm whether the compressor enters the oil return mode. Similarly, the second prompt message can include text prompt content displayed on the display interface. The content of the second prompt message can be the same as the content of the first prompt message, or it can be different from the content of the first prompt message. In addition, the second prompt message can also include sound prompt content on the speaker. The content of the second prompt message broadcast on the speaker can be the same as the content of the first prompt message broadcast on the speaker, or it can be different from the content of the first prompt message broadcast on the speaker. It can be set according to actual conditions.

[0068] In the air conditioning system, the role of the compressor is to suck in low-temperature, low-pressure refrigerant vapor, compress it to increase its pressure and temperature, compress it into high-temperature, high-pressure steam, and then discharge it to the condenser. In the refrigeration process, the compressor is the power source of the refrigerant cycle, ensuring that the refrigerant circulates in the system.

[0069] The main function of the condenser is to cool the high-temperature and high-pressure gas discharged from the compressor into liquid through heat exchange, while releasing the heat to the outdoor air. This process is an indispensable part of the refrigeration cycle, ensuring that the refrigerant can enter the evaporator again for the next refrigeration cycle.

[0070] When the compressor pressure is too high, it may cause damage to the compressor components inside the air conditioning system, which may cause the air conditioning to fail or not work properly.

[0071] In some embodiments of the present application, Figure 4 As shown, the air conditioning compressor protection method of the present application may also include:

[0072] S500: monitor the pressure value at the compressor outlet.

[0073] A three-way valve is arranged between the compressor and the condenser, the inlet end of the three-way valve is connected to the compressor, the first outlet end of the electric three-way valve is connected to the first condenser, and the second outlet end of the three-way valve is connected to the second condenser. The three-way valve can be T-type or L-type, and the three-way valve can be an electric three-way valve, a pneumatic three-way valve or a hydraulic three-way valve. This application is introduced by taking the electric three-way valve of the T-type three-way valve as an example, and the valve plate corresponding to the three-way valve is driven to rotate by the rotation of the servo motor to realize the connection between the compressor and the first condenser, the compressor and the second condenser, and the compressor and the first condenser and the second condenser. A pressure sensor is arranged at the outlet of the compressor to monitor the pressure value of the compressor outlet.

[0074] S600: Controlling the operating state of the air conditioning system according to the pressure value at the compressor outlet.

[0075] When construction machinery is working, the demand for the air-conditioning system varies depending on the working conditions, so there will be some working conditions where the air-conditioning system operates at high load. In order to avoid the cooling effect being less than expected and damage to parts caused by the high-load operation of the air-conditioning system, this application monitors the pressure value at the compressor outlet by adding a pressure sensor, a three-way valve and a second condenser. According to the different pressure values ​​at the compressor outlet, the air-conditioning system is controlled to enter different operating states, which can effectively prevent the compressor pressure from being too high and causing damage to the compressor components. The operating states of the air-conditioning system include a single condensing operating state and a double condensing operating state.

[0076] In some embodiments of the present application, Figure 5 As shown, in S600, the specific steps of controlling the operating state of the air conditioning system according to the pressure value at the compressor outlet may include:

[0077] S601: When the pressure value at the compressor outlet is less than or equal to the first preset pressure value, the compressor is connected to the first condenser, and the current air-conditioning system is in a single condensing operation state.

[0078] According to the actual situation, the first preset pressure value P1, the second preset pressure value nP1, and the third preset pressure value P2 can be preset in advance, where n is a preset overpressure margin coefficient, and the value range is 1 < n < 2, and the first preset pressure value P1 is less than the second preset pressure value nP1, and the third preset pressure value P2 is less than the first preset pressure value P1. The first outlet end of the three-way valve is a normally open outlet, and the first condenser is always connected to the air-conditioning system at all times, that is, the compressor is always connected to the first condenser. Obtain the value of the pressure sensor at the compressor outlet and compare it with the first preset pressure value first. When the pressure value at the compressor outlet is less than or equal to the first preset pressure value, the current air-conditioning system is in a single-condensing operation state.

[0079] In some embodiments, when the pressure value at the compressor outlet is less than or equal to the second preset pressure value and greater than the first preset pressure value, the single-condensing operation state of the current air-conditioning system is maintained.

[0080] As the air-conditioning system continues to operate, the pressure value at the compressor outlet shows an upward trend. When it is monitored that the pressure value at the compressor outlet is greater than the first preset pressure value and less than or equal to the second preset pressure value, the first condenser can still completely cool the high-temperature and high-pressure gas in the compressor. At this time, there is no need to start the second condenser, and the single-condensing operation state of the current air-conditioning system is continued.

[0081] When the servo motor controls the electric three-way valve, first, the controller (such as PLC) sends out pulse signals, and these signals are received by the servo driver of the servo motor and converted into electrical signals to drive the servo motor to rotate. The encoder of the servo motor is responsible for monitoring the rotation angle and speed of the motor and feeding this information back to the servo driver. Through this closed-loop control, the servo system can accurately control the position and speed of the motor, and drive the valve stem of the three-way valve to make the valve disc perform corresponding actions in the valve body, thereby changing the on-off state of the valve port, so as to achieve precise adjustment of the electric three-way valve.

[0082] In some embodiments of the present application, as Figure 6 shown, the specific steps of controlling the operation state of the air-conditioning system according to the pressure value at the compressor outlet in S600 may further include:

[0083] S602: When the pressure value at the compressor outlet is greater than or equal to the second preset pressure value, control the servo motor to rotate forward by a first preset angle, drive the second valve disc of the three-way valve to rotate forward by a second preset angle, and connect the compressor to both the first condenser and the second condenser at the same time, so that the air-conditioning system enters a dual-condensing operation state.

[0084] The first preset angle and the second preset angle are preset, and the servo motor and the valve plate driven by the servo motor have the same rotation angle, that is, the first preset angle and the second preset angle are equal, and the first preset angle and the second preset angle are generally set to 90 degrees. The pressure value at the compressor outlet is continuously monitored. When the pressure value at the compressor outlet is greater than or equal to the second preset pressure value, the pressure in the air-conditioning system pipeline is relatively large, and the first condenser obviously cannot completely cool the high-temperature and high-pressure gas in the compressor. At this time, the second condenser needs to be started, and the first condenser and the second condenser work at the same time to maintain the normal refrigeration cycle of the construction machinery. To start the second condenser, the channel between the inlet end and the second outlet end of the three-way valve needs to be opened. The servo motor needs to be controlled to rotate forward 90 degrees, driving the second valve plate of the three-way valve to rotate forward 90 degrees. The compressor is connected to the first condenser and the second condenser at the same time, so that the air-conditioning system enters a dual condensation operation state.

[0085] In some embodiments of the present application, Figure 7 As shown, in S600, the specific steps of controlling the operating state of the air conditioning system according to the pressure value at the compressor outlet may also include:

[0086] S603: Obtain a first real-time pressure value at the compressor outlet after the compressor is connected to the second condenser. When the first real-time pressure value is less than a third preset pressure value, control the servo motor to reverse by a first preset angle, drive the second valve plate of the three-way valve to reverse by a second preset angle, and disconnect the compressor from the second condenser to restore the air-conditioning system to a single condensing operation state.

[0087] After the compressor is connected to the second condenser, that is, when the air-conditioning system enters the dual condensing operation state, the pressure value at the compressor outlet will tend to decrease. The pressure value at the compressor outlet will continue to be monitored. In order to distinguish it from the pressure value at the compressor outlet mentioned above, the pressure value at the compressor outlet after the compressor is connected to the second condenser is defined as the first real-time pressure value. When the first real-time pressure value is less than the third preset pressure value, the pressure in the air-conditioning system pipeline returns to the normal range. The first condenser can completely cool the high-temperature and high-pressure gas in the compressor. The first condenser works alone to maintain the normal refrigeration cycle of the construction machinery. To close the second condenser, the inlet and second outlet channels of the three-way valve need to be closed, the servo motor is controlled to reverse 90 degrees, and the second valve plate of the three-way valve is driven to reverse 90 degrees. The compressor is disconnected from the second condenser to restore the air-conditioning system to the single condensing operation state.

[0088] In some embodiments of the present application, the third preset pressure value is less than half of the second preset pressure value.

[0089] In the present application, when the pressure value at the compressor outlet rises to a value greater than or equal to the second preset pressure value, the channel between the inlet end and the second outlet end of the three-way valve is opened, and the air conditioning system transitions from a single condensing operation state to a double condensing operation state, after which the pressure at the compressor outlet will show a downward trend, and when the first real-time pressure value at the compressor outlet after the compressor is connected to the second condenser drops to a value less than the third preset pressure value, the channel between the inlet end and the second outlet end of the three-way valve is closed, and the air conditioning system transitions from a double condensing operation state to a single condensing operation state, after which the pressure at the compressor outlet will show an upward trend, and so on and so forth. If the third preset pressure value is not much different from the second preset pressure value, the channel between the inlet end and the second outlet end of the three-way valve will be frequently opened and closed, that is, the second valve plate will frequently rotate, which may easily cause damage to the second valve plate. Therefore, in order to avoid frequent opening and closing of the channel between the inlet end and the second outlet end of the three-way valve, the size relationship between the third preset pressure value and the second preset pressure value is set as follows: the third preset pressure value is less than half of the second preset pressure value.

[0090] In order to protect the air-conditioning compressor and the entire air-conditioning system, the present application firstly sets the conditions for the air-conditioning system compressor to enter the oil return mode, that is, when the air-conditioning compressor stops running for a time period greater than or equal to the first preset time period, generates a first prompt message for reminding the user to confirm whether the compressor enters the oil return mode. By setting the conditions for entering the oil return mode, it is possible to prevent the air-conditioning system that has not been running for a long time from being damaged due to lack of lubrication of the compressor; when the conditions for entering the oil return mode are met, the user is prompted to determine whether to enter the oil return mode, taking into account the situation that the user may refuse to enter the oil return mode in the event of an emergency. Secondly, by adding a three-way valve between the compressor and the condenser, adding a pressure sensor to the compressor outlet and connecting the second outlet of the three-way valve to the second condenser, the operating state of the air-conditioning system is controlled by monitoring the pressure value at the compressor outlet, and then adjusting the pressure in the air-conditioning system to protect the air-conditioning compressor and the entire air-conditioning system.

[0091] Exemplary Control Devices

[0092] In some embodiments of the present application, Figure 8 As shown, an air conditioner compressor protection device is provided, comprising: a data acquisition module 801, a confirmation module 802 and a control module 803, wherein:

[0093] The data acquisition module 801 is used to obtain the duration of the air-conditioning compressor stopping operation.

[0094] The confirmation module 802 is used to generate a first prompt message when the air-conditioning compressor stops running for a time period greater than or equal to a first preset time period, and the first prompt message is used to remind the user to confirm whether the compressor enters the oil return mode.

[0095] The control module 803 is used to control the engine gear to a preset gear and maintain it at the preset gear for a second preset time when receiving the first confirmation information indicating that the compressor enters the oil return mode, and control the compressor to operate and operate for the second preset time.

[0096] Specifically, the data acquisition module 801 respectively acquires the time when the compressor stopped running the last time, and the current start time of the engine each time the engine is started, and calculates the difference between the current start time of the engine and the time when the air-conditioning compressor stopped running the last time, that is, the length of time the air-conditioning compressor stopped running. The data acquisition module may include an air-conditioning controller, a vehicle controller, or other devices that can record the time when the compressor stopped running or the engine started.

[0097] In order to determine whether the compressor needs to return oil, the confirmation module 802 is communicated with the data acquisition module 801. The confirmation module 802 obtains the duration of the air-conditioning compressor stopping operation obtained by the data acquisition module 801, and compares the duration of the air-conditioning compressor stopping operation with the first preset duration. When the duration of the air-conditioning compressor stopping operation is greater than or equal to the first preset duration, the compressor needs to return oil. The confirmation module generates a first prompt message, and the first prompt message is used to remind the user to confirm whether the compressor enters the oil return mode.

[0098] The control module 803 obtains the result of the user confirming whether the compressor enters the oil return mode. When it is confirmed that the compressor enters the oil return mode, the control module 803 controls the engine gear to remain at the preset gear within the second preset time length, and controls the compressor to operate for the second preset time length.

[0099] In addition, the air-conditioning compressor protection device provided in this embodiment belongs to the same application concept as the air-conditioning compressor protection method provided in the above embodiments of this application, and can execute the air-conditioning compressor protection method provided in any of the above embodiments of this application, and has the corresponding functional units and beneficial effects of executing the air-conditioning compressor protection method. For technical details not fully described in this embodiment, please refer to the specific processing content of the air-conditioning compressor protection method provided in the above embodiments of this application, and will not be repeated here.

[0100] Exemplary construction machinery

[0101] In some embodiments of the present application, there is provided a construction machinery including: an air-conditioning compressor and the air-conditioning compressor protection device described above.

[0102] All mechanical equipment required for earthwork construction, road construction and maintenance, mobile lifting and loading and unloading operations, and comprehensive mechanized construction required for various construction projects are called engineering machinery. Specifically, engineering machinery can include loaders, bulldozers, excavators, road rollers, concrete mixers, etc. This application does not specify the specific type of engineering machinery. Without exceeding the technical concept of this application, they all belong to the protection scope of the embodiments of this application.

[0103] Exemplary Electronic Devices

[0104] In some embodiments of the present application, an electronic device is provided, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above-mentioned air-conditioning compressor protection methods when executing the computer program.

[0105] Specifically, the electronic device may further include: a bus, a communication interface, an input device and an output device. The processor, the memory, the communication interface, the input device and the output device are interconnected through the bus. The bus may include a path to transmit information between various components of the computer system.

[0106] The processor may be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application. It may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component.

[0107] The processor may include a main processor and may also include a baseband chip, a modem, etc.

[0108] The memory stores a computer program for executing the technical solution of the present application, and may also store an operating system and other key services. Specifically, the program may include a program code, and the program code includes computer operation instructions. More specifically, the memory may include a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a random access memory (RAM), other types of dynamic storage devices that can store information and instructions, a disk storage, a flash, and the like.

[0109] The computer program may be written in any combination of one or more programming languages ​​to write program code for performing the operations of the embodiments of the present specification, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0110] The input device may include a device for receiving data and information input by a user, such as a keyboard, a mouse, a camera, a scanner, a light pen, a voice input device, a touch screen, a pedometer, or a gravity sensor.

[0111] Output devices may include means that allow information to be output to a user, such as display screens, printers, speakers, etc.

[0112] The communication interface may include using any transceiver or the like to communicate with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc.

[0113] The processor executes the program stored in the memory and calls other devices, which can be used to implement the various steps of the air-conditioning compressor protection method provided in the above-mentioned embodiment of the present application.

[0114] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] Those skilled in the art will appreciate that all or part of the steps in the above method can be completed by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, etc. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits. Accordingly, each module / unit in the above embodiment can be implemented in the form of hardware or in the form of a software functional module. The present disclosure is not limited to any particular form of combination of hardware and software.

[0116] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0117] The above is an explanation of the present disclosure and should not be considered as a limitation thereof. Although several exemplary embodiments of the present disclosure are described, it will be readily understood by those skilled in the art that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined in the claims. It should be understood that the above is an explanation of the present disclosure and should not be considered to be limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present disclosure is defined by the claims and their equivalents.

Claims

1. A method for protecting an air-conditioning compressor, characterized in that: include: Get the duration of air conditioner compressor stopping operation; When the air-conditioning compressor stops running for a period of time greater than or equal to a first preset period of time, generating a first prompt message, wherein the first prompt message is used to remind the user to confirm whether the compressor enters the oil return mode; When the first confirmation information indicating that the compressor has entered the oil return mode is received, the gear of the engine is controlled to be a preset gear and maintained at the preset gear within a second preset time, and the compressor is controlled to operate and operate for the second preset time.

2. The air conditioning compressor protection method according to claim 1, characterized in that: The method further comprises: When the second confirmation information indicating that the compressor refuses to enter the oil return mode is received, a second prompt information is generated when the engine is started next time, and the second prompt information is used to remind the user to confirm whether the compressor enters the oil return mode.

3. The air conditioning compressor protection method according to claim 1, characterized in that: The method further comprises: Monitor the pressure value at the compressor outlet; The operating state of the air conditioning system is controlled according to the pressure value at the compressor outlet.

4. The air conditioning compressor protection method according to claim 3, characterized in that: According to the pressure value at the compressor outlet, the operating state of the air conditioning system is controlled, including: When the pressure value at the compressor outlet is less than or equal to the first preset pressure value, the compressor is connected to the first condenser, and the current air-conditioning system is in a single condensing operation state.

5. The method for protecting an air-conditioning compressor according to claim 3, characterized in that: The method further comprises: When the pressure value at the compressor outlet is greater than or equal to the second preset pressure value, the servo motor is controlled to rotate forward by a first preset angle, driving the second valve plate of the three-way valve to rotate forward by a second preset angle, and the compressor is connected to the first condenser and the second condenser at the same time, so that the air-conditioning system enters a dual condensing operation state.

6. The method for protecting an air-conditioning compressor according to claim 5, characterized in that: The method further comprises: Obtain the first real-time pressure value of the compressor outlet after the compressor is connected to the second condenser. When the first real-time pressure value is less than the third preset pressure value, control the servo motor to reverse the first preset angle, drive the second valve plate of the three-way valve to reverse the second preset angle, and disconnect the compressor from the second condenser to restore the air-conditioning system to the single condensing operation state.

7. The air conditioning compressor protection method according to claim 6, characterized in that: The third preset pressure value is less than half of the second preset pressure value.

8. The method for protecting an air-conditioning compressor according to claim 1, characterized in that: The obtaining of the duration of the air conditioner compressor stopping operation includes: Get the time when the air conditioner compressor stopped running last time; Get the current start time of the engine; The duration of the air conditioning compressor stopping operation is calculated based on the current start time of the engine and the time when the air conditioning compressor stopped operation most recently.

9. An air conditioner compressor protection device, characterized in that: include: A data acquisition module, the data acquisition module is used to obtain the duration of the air-conditioning compressor stopping operation; A confirmation module, the confirmation module is used to generate a first prompt message when the air-conditioning compressor stops running for a time period greater than or equal to a first preset time period, the first prompt message is used to remind the user to confirm whether the compressor enters the oil return mode; A control module, wherein the control module is used to control the gear of the engine to a preset gear and maintain it at the preset gear for a second preset time when receiving a first confirmation message indicating that the compressor has entered an oil return mode, and to control the compressor to operate for a second preset time.

10. An engineering machine, characterized in that: include: An air-conditioning compressor and an air-conditioning compressor protection device as claimed in claim 9.

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