Control method and device for external control valve of compressor and air conditioner controller

Abstract

The invention provides a control method and device for an external control valve of a compressor and an air conditioner controller, which are applied to the air conditioner controller and comprise the following steps: receiving a refrigeration request of a user, and starting the compressor; a control instruction is sent to an external control valve of the compressor based on the refrigeration request, and current is provided for the external control valve through the whole vehicle current, so that the external control valve adjusts the opening degree of the valve; and when it is monitored that the working states of the external control valve and the compressor reach preset conditions, a preset protection strategy is started to control the external control valve to adjust the current value. The durability of the compressor can be effectively protected, meanwhile, the refrigeration requirement of the whole vehicle is met, and the oil consumption of the whole vehicle is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor protection, and in particular to a control method and device for a compressor external control valve, and an air-conditioning controller. Background Art

[0002] When a vehicle is driving on an unlimited speed highway, many users will drive at the highest speed. In this way, in hot weather, the performance requirements for the air-conditioning compressor will increase. The compressor needs to work at continuous high temperature and high speed, and the internal piston needs to work at full stroke and full load. This places high demands on the material and wear resistance of the piston.

[0003] As the power output source for vehicle air conditioning comfort, the compressor is crucial in the air conditioning refrigeration system. Once a malfunction occurs during operation, the air conditioning will not cool, directly causing customer complaints. In areas with no speed limit on highways, it is necessary to ensure both customer driving pleasure and air conditioning comfort. However, under high-temperature and high-speed operating conditions, the compressor currently has at least the following problems: the compressor itself is heavily loaded, the internal piston mechanism is easily worn, resulting in the air conditioning not cooling, and the vehicle consumes a lot of fuel. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a control method and device for a compressor external control valve and an air-conditioning controller to effectively protect the durability of the compressor, while meeting the cooling needs of the entire vehicle and reducing the fuel consumption of the entire vehicle.

[0005] In order to achieve the above objectives, the technical solutions adopted in the embodiments of the present invention are as follows: In the first aspect, an embodiment of the present invention provides a method for controlling a compressor external control valve, which is applied to an air-conditioning controller, including: receiving a user's cooling request and starting the compressor; sending a control instruction to the compressor's external control valve based on the cooling request and providing current to the external control valve through the vehicle current so that the external control valve adjusts the valve opening; when it is monitored that the working status of the external control valve and the compressor reaches a preset condition, a preset protection strategy is activated to control the external control valve to adjust the current value.

[0006] Optionally, when it is monitored that the working status of the external control valve and the compressor reaches the preset conditions, the preset protection strategy is activated to control the compressor external control valve to adjust the current value, including: when it is monitored that the current value of the external control valve is the maximum working current value and the speed of the compressor reaches the preset speed, the preset protection strategy is activated to control the compressor external control valve to adjust the current value.

[0007] Optionally, a preset protection strategy is started to control the compressor external control valve to adjust the current value, including: obtaining the protection current value and the current regulation rate based on a pre-calibrated current protection curve; generating a current regulation instruction based on the protection current value and the current regulation rate; and sending the current regulation instruction to the external control valve so that the external control valve adjusts the current value of the external control valve to the protection current value according to the current regulation rate.

[0008] Optionally, the current protection curve includes: when the current value of the external control valve is the maximum current value, as the speed of the compressor increases, the current value of the external control valve remains unchanged; when the speed of the compressor reaches a preset speed, as the speed of the compressor increases, the current value of the external control valve decreases to a protection current value according to the current regulation rate; when the current value of the external control valve reaches the protection current value, as the speed of the compressor increases, the current value of the external control valve remains unchanged.

[0009] Optionally, a control instruction is sent to the external control valve of the compressor based on the cooling request, and current is provided to the external control valve through the whole vehicle current, so that the external control valve adjusts the valve opening, including: based on the cooling request, obtaining the evaporator temperature, the target evaporator temperature and the pressure of the compressor; based on the evaporator temperature, the target evaporator temperature and the pressure of the compressor, calculating the valve opening of the external control valve; based on the valve opening of the external control valve, determining the target current value of the external control valve; based on the target current value, generating a control instruction, and sending the control instruction to the external control valve and providing the target current value to the external control valve through the whole vehicle current, so that the external control valve adjusts the valve opening.

[0010] Optionally, the control instruction includes a first control instruction and a second control instruction; based on the target current value, the control instruction is generated, including: collecting the current value of the external control valve; when the current current value of the external control valve is greater than the target current value, the current decrease rate is obtained, and based on the current decrease rate and the target current value, a first control instruction is generated; when the current current value of the external control valve is less than the target current value, the current increase rate is obtained, and based on the current increase rate and the target current value, a second control instruction is generated.

[0011] In the second aspect, an embodiment of the present invention provides a control device for a compressor external control valve, which is applied to an air-conditioning controller, including: a refrigeration request receiving module, which is used to receive a user's refrigeration request and start the compressor; a control module, which is used to send a control instruction to the compressor's external control valve based on the refrigeration request and provide current to the external control valve through the vehicle current so that the external control valve can adjust the valve opening; a protection module, which is used to start a preset protection strategy to control the external control valve to adjust the current value when it is monitored that the working status of the external control valve and the compressor reaches a preset condition.

[0012] In a third aspect, an embodiment of the present invention provides an air-conditioning controller, which controls a compressor using any one of the methods provided in the first aspect.

[0013] In a fourth aspect, an embodiment of the present invention provides a vehicle comprising: an air-conditioning controller and a compressor provided in the third aspect above; the air-conditioning controller controls the compressor using any one of the methods provided in the first aspect above.

[0014] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the methods provided in the first aspect are executed.

[0015] The embodiments of the present invention bring the following beneficial effects: The control method, device and air conditioner controller of the compressor external control valve provided by the present invention are applied to the air conditioner controller. First, a user's cooling request is received and the compressor is started. Then, based on the cooling request, a control instruction is sent to the compressor's external control valve and current is supplied to the external control valve through the vehicle current so that the external control valve adjusts the valve opening. When it is monitored that the working status of the external control valve and the compressor reaches a preset condition, a preset protection strategy is activated to control the external control valve to adjust the current value. When the vehicle has a cooling demand, the above method sends a control instruction to the external control valve and current is supplied to the external control valve through the vehicle current so that the external control valve adjusts the valve opening and provides a corresponding cooling capacity. When it is monitored that the working status of the external control valve and the compressor reaches a preset condition, the preset protection strategy is activated to adjust the current value of the external control valve, thereby effectively protecting the durability of the compressor, meeting the cooling demand of the vehicle, reducing the power demand on the engine under high-speed working conditions, improving the customer's driving experience, and reducing the fuel consumption of the vehicle.

[0016] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1A schematic structural diagram of a compressor provided by an embodiment of the present invention; Figure 2 A schematic diagram of the operation of a piston and a cylinder of an external control valve provided by an embodiment of the present invention; Figure 3 A schematic diagram of the operation of a piston and a cylinder of another external control valve provided by an embodiment of the present invention; Figure 4 A flowchart of a method for controlling a compressor external control valve provided by an embodiment of the present invention; Figure 5 A current protection curve for a compressor external control valve provided by an embodiment of the present invention; Figure 6 A schematic diagram showing a performance comparison between a no-current protection curve and a current protection curve provided by an embodiment of the present invention; Figure 7 A flow chart of another method for controlling a compressor external control valve provided by an embodiment of the present invention; Figure 8 A schematic structural diagram of a control device for a compressor external control valve provided by an embodiment of the present invention.

[0020] icon: 1-Drive plate; 2-Clutch pulley assembly; 3-Main shaft; 4-Swash plate assembly; 5-Cylinder block; 6-Piston; 7-External control valve. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] First, the working principle of the externally controlled variable displacement compressor and the characteristics of the externally controlled valve are introduced. Figure 1 As shown, the drive plate 1, the main shaft 3, the swash plate assembly 4, and the piston 6 are connected by bolts to form a whole. When the air conditioner is not turned on, this whole is disconnected from the clutch pulley assembly 2. When the air conditioner is turned on, the compressor receives a signal, the drive plate 1 is attracted, and it forms a whole with the clutch pulley assembly. Under the connection of the engine belt, the compressor starts to work. The external control valve 7 provides different cooling capacities by changing the valve opening of the external control valve 7 according to the current value instruction issued by the CLM (air conditioning controller). If the current value of the external control valve 7 is always the maximum value, it will cause the internal piston 6 to be in a full-stroke working state from the bottom of the cylinder to the top of the cylinder for a long time. Since the piston has been working in a large-displacement state for a long time, Figures 2 to 3During this process, the margin of fit between the piston and the cylinder body becomes increasingly smaller, potentially causing a lateral force to tilt the piston 6 during operation. This creates the risk of friction between the piston 6 and the cylinder body 5. Once friction occurs, foreign matter can be generated, causing internal contamination of the compressor and clogging of the external control valve 7, leading to compressor failure and loss of cooling. In summary, currently, under high-temperature and high-speed operating conditions, compressors face at least the following issues: heavy load on the compressor itself, easy wear of the internal piston mechanism, resulting in air conditioning failure, and high vehicle fuel consumption.

[0023] Based on this, the embodiments of the present invention provide a control method, device, and air-conditioning controller for a compressor external control valve, which can effectively protect the durability of the compressor while meeting the cooling needs of the entire vehicle and reducing the fuel consumption of the entire vehicle.

[0024] To facilitate understanding of this embodiment, a method for controlling a compressor external control valve disclosed in an embodiment of the present invention is described in detail below. This method is applied to an air conditioner controller. Figure 4 The flowchart of a method for controlling a compressor external control valve is shown, which illustrates that the method mainly includes the following steps S401 to S403: Step S401: receiving a cooling request from a user and starting the compressor.

[0025] In one embodiment, when a user requests cooling, they can activate the air conditioner's cooling function by pressing the "A / C" button on the air conditioner control panel. The user can also use the temperature knob or button to adjust the temperature to the blue zone (cold air) or set a specific temperature, and adjust the air volume button to select an appropriate air speed. At this point, the CLM receives the cooling request, connects the power circuit to the compressor, and the compressor begins operating, activating the refrigerant circulation system.

[0026] Step S402: sending a control instruction to the external control valve of the compressor based on the cooling request and providing current to the external control valve through the vehicle current, so that the external control valve adjusts the valve opening.

[0027] In one embodiment, after receiving a cooling request, the CLM can determine the valve opening of the external control valve through logical calculation based on parameters such as the evaporator temperature, the compressor pressure, and the target evaporator temperature. The CLM then issues a control instruction and provides a corresponding current value to the external control valve through the vehicle current, thereby allowing the control valve to adjust the valve opening size and provide corresponding cooling capacity.

[0028] Step S403: When it is monitored that the working states of the external control valve and the compressor reach the preset conditions, the preset protection strategy is activated to control the external control valve to adjust the current value.

[0029] In one embodiment, the operating status of the external control valve and compressor is continuously monitored during the cooling process of the air conditioner. When the operating status of the external control valve and compressor reaches a preset condition, a preset protection strategy is activated to control the external control valve to adjust the current value to prevent the external control valve current from being constantly at a maximum current value, which could cause wear of the compressor's internal piston and result in cooling failure of the air conditioner.

[0030] The control method for the above-mentioned compressor external control valve provided in an embodiment of the present invention sends a control instruction to the external control valve and provides current to the external control valve through the vehicle current when the vehicle has a cooling demand, so that the external control valve adjusts the valve opening and provides corresponding cooling capacity. When it is monitored that the working status of the external control valve and the compressor reaches the preset conditions, the preset protection strategy is activated and the current value of the external control valve is adjusted, thereby effectively protecting the durability of the compressor and meeting the cooling demand of the entire vehicle. At the same time, it reduces the power demand for the engine under high-speed conditions, improves the customer's driving experience, and reduces the fuel consumption of the entire vehicle.

[0031] In one embodiment, for the aforementioned step S403, that is, when it is monitored that the working status of the external control valve and the compressor reaches the preset conditions, the preset protection strategy is activated to control the compressor external control valve to adjust the current value, and the following methods can be adopted, including but not limited to: when it is monitored that the current value of the external control valve is the maximum working current value and the speed of the compressor reaches the preset speed, the preset protection strategy is activated to control the compressor external control valve to adjust the current value.

[0032] During specific implementation, under high-temperature and high-speed operating conditions, if the user's cooling needs need to be met, the external control valve is usually required to open the valve opening to the maximum. At this time, the current value of the external control valve will also be maintained at the maximum current value. In order to protect the durability of the compressor and meet the cooling needs of the entire vehicle at the same time, in an embodiment of the present invention, when it is monitored that the current value of the external control valve is the maximum operating current value (for example, 750mA) and the speed of the compressor reaches a preset speed (for example, 4500rpm), the preset protection strategy can be activated to control the external control valve to adjust the current value.

[0033] Furthermore, a preset protection strategy is activated to control the compressor external control valve to adjust the current value, including but not limited to the following methods: First, based on a pre-calibrated current protection curve, the protection current value and the current regulation rate are obtained.

[0034] In a specific implementation, the current protection curve includes: when the current value of the external control valve is the maximum current value, as the speed of the compressor increases, the current value of the external control valve remains unchanged; when the speed of the compressor reaches the preset speed, as the speed of the compressor increases, the current value of the external control valve decreases to the protection current value according to the current regulation rate; when the current value of the external control valve reaches the protection current value, as the speed of the compressor increases, the current value of the external control valve remains unchanged. Figure 5 As shown in the figure, when the external control valve is at the maximum current value of 750mA, as the speed of the compressor increases, the current value of the external control valve remains unchanged; when the speed of the compressor reaches the preset speed of 4500rpm, as the speed of the compressor increases, the current value of the external control valve decreases to the protection current value of 450mA according to the current regulation rate; when the current value of the external control valve decreases to 450mA, the current value of the external control valve remains unchanged.

[0035] Based on this, in an embodiment of the present invention, after the preset protection strategy is activated, the protection current value of 450mA can be obtained based on the current protection curve. Simultaneously, the adjustment time is determined based on the change in compressor speed when the external control valve current decreases from the maximum current value to the protection current value. The current adjustment rate is then determined based on the ratio of the current adjustment amount (i.e., the difference between the maximum current value and the protection current value) to the adjustment time. The current adjustment rate can also be preset (for example, 10mA / 100ms) and stored in the CLM. When the preset protection strategy is activated, the current adjustment rate can be directly read.

[0036] Then, a current regulation instruction is generated based on the protection current value and the current regulation rate.

[0037] Finally, the current adjustment instruction is sent to the external control valve, so that the external control valve adjusts the current value of the external control valve to the protection current value according to the current adjustment rate.

[0038] In a specific implementation, after determining the protection current value and current regulation rate based on the current protection curve, a current regulation instruction can be generated based on the protection current value and the current regulation rate, and the current regulation instruction can be sent to the external control valve. After receiving the current instruction, the external control valve can adjust the current value of the external control valve to the protection current value according to the current regulation rate.

[0039] In the embodiment of the present invention, the current value and speed of the external control valve are calibrated in advance under high temperature and high speed conditions to obtain a current protection curve. Specifically, when the vehicle is traveling at high speed and in hot weather, and the compressor continues to operate at high temperature and high speed, the current value of the external control valve is reduced to different current values ​​at different compressor speeds, and the cooling capacity and cooling effect of the air conditioner in each case are collected. The current protection curve is obtained by determining the preset speed and protection current value of the compressor. Figure 6As shown in the figure, it has been verified that after adding the protection strategy, the performance of the compressor is equivalent to that without adding the protection strategy, and can meet the cooling target requirements of the entire vehicle.

[0040] In one embodiment, for the aforementioned step S402, i.e., sending a control instruction to the external control valve of the compressor based on the cooling request and providing current to the external control valve through the vehicle current so that the external control valve adjusts the valve opening, the following methods may be used, but are not limited to: First, based on the cooling request, the evaporator temperature, target evaporator temperature, and compressor pressure are acquired. In practice, the evaporator temperature refers to the current evaporator temperature at the time the cooling request is received, while the target evaporator temperature is the desired evaporator temperature based on the user's cooling needs. Specifically, the evaporator temperature can be acquired using a temperature sensor, and the compressor temperature can be acquired using a pressure sensor. The target evaporator temperature is then acquired based on the user's cooling request.

[0041] Then, the valve opening of the external control valve is calculated based on the evaporator temperature, the target evaporator temperature, and the pressure of the compressor.

[0042] In specific implementation, PID control can be used to perform proportional, integral, and differential control based on the temperature difference (target evaporator temperature - evaporator temperature). Assume that the valve opening K (range 0~100%) of the external control valve is output by the PID controller:

[0043] Among them, e(t) is the temperature difference, Kp, Ki, Kd are the proportional, integral, and differential coefficients, and K(t) is the valve opening.

[0044] In the embodiment of the present invention, the compressor pressure P_comp is introduced as a feedforward variable to correct the valve opening:

[0045] Where α is the pressure compensation coefficient and P_nominal is the nominal pressure value of the system.

[0046] When the evaporator temperature is close to the freezing point (such as below 3°C), the protection logic can be introduced to , to limit the minimum opening and prevent icing.

[0047] When the evaporator temperature, the target evaporator temperature, and the compressor pressure are obtained, the valve opening of the external control valve can be calculated according to the above formula.

[0048] Next, based on the valve opening of the external control valve, a target current value of the external control valve is determined.

[0049] In specific implementation, if the external control valve is linearly adjustable within the target opening range, the target current value can be calculated by linear interpolation:

[0050] Where I_target is the target current value, K_target is the valve opening of the external control valve, K_min and K_max are the minimum and maximum effective valve openings, and I_min and I_max are the current values ​​corresponding to the minimum and maximum openings.

[0051] If the external control valve characteristic is nonlinear, the target current value can be determined by looking up a table. The corresponding relationship between the valve opening and the current is pre-calibrated, and the target current value is obtained by looking up the table or interpolating according to the valve opening of the external control valve.

[0052] Finally, based on the target current value, a control instruction is generated and sent to the external control valve. The target current value is provided to the external control valve through the vehicle current, so that the external control valve adjusts the valve opening size.

[0053] In specific implementation, after determining the target current value required by the external control valve, the target current value can be provided to the external control valve through the vehicle current, and a control instruction can be generated according to the target current value, and the control instruction can be sent to the external control valve to enable the external control valve to adjust the valve opening size.

[0054] In one embodiment, considering that the external control valve has an initial current value when the compressor is turned on, when it needs to be adjusted to a target current value, there may be two situations: current increase and current decrease. Based on this, the control instruction includes a first control instruction and a second control instruction. When generating the control instruction based on the target current value, the following steps are included: first, collecting the current value of the external control valve; when the current value of the external control valve is greater than the target current value, obtaining the current decrease rate, and generating the first control instruction based on the current decrease rate and the target current value; when the current value of the external control valve is less than the target current value, obtaining the current increase rate, and generating the second control instruction based on the current increase rate and the target current value.

[0055] During specific implementation, CLM collects the current value of the external control valve and compares the current value with the target current value. If the current current value of the external control valve is greater than the target current value, the current value of the external control valve needs to be reduced from the current current value to the target current value. At this time, a preset current decrease rate is obtained, and a first control instruction is generated based on the current decrease rate and the target current value, so that the external control valve reduces the current value to the target current value according to the current decrease rate; if the current current value of the external control valve is less than the target current value, the current value of the external control valve needs to be increased from the current current value to the target current value. At this time, a preset current increase rate is obtained, and a second control instruction is generated based on the current increase rate and the target current value, so that the external control valve increases the current value to the target current value according to the current increase rate.

[0056] For ease of understanding, the present invention also provides a flow chart of a method for controlling a compressor external control valve. Figure 7 As shown in the figure, when the CLM detects the cooling demand, it calculates the valve opening of the external control valve based on the evaporator temperature, system pressure, target evaporator and other parameters, and sends a command through the CLM to provide the corresponding current value to the external control valve, thereby controlling the valve to adjust the opening size and provide the corresponding cooling capacity.

[0057] Specifically, the evaporator temperature is monitored to see whether it reaches the target evaporator temperature (i.e., the temperature set by the user). If the evaporator temperature does not reach the target evaporator temperature, the electronic control valve (ECV) is judged to see whether it reaches the maximum current value according to the preset current protection curve. If the external control valve does not reach the maximum current value, the current current value is compared with the target current value. If the current current value is less than the target current value, the external control valve adjusts the current value to the target current value according to the current rising rate (for example, 100mA / 100ms). If the current current value is greater than the target current value, the external control valve adjusts the current value to the target current value according to the current falling rate (for example, 50mA / 100ms-10mA / 100ms), and continuously monitors whether the evaporator temperature reaches the target evaporator temperature.

[0058] The control method for the compressor external control valve provided in an embodiment of the present invention protects the durability of the compressor body by reducing the current value under high-speed operating conditions of the compressor, reduces the probability of the air conditioner not cooling due to piston wear, and at the same time, after adding a protection strategy, it can meet the cooling target requirements of the entire vehicle and reduce the fuel consumption of the entire vehicle.

[0059] Regarding the control method of the compressor external control valve provided in the above embodiment, the present invention also provides a control device for the compressor external control valve, which is applied to the air conditioner controller, see Figure 8The schematic diagram of the structure of a control device for a compressor external control valve is shown, which shows that the device mainly includes the following parts: The cooling request receiving module 801 is used to receive a cooling request from a user and start the compressor.

[0060] The control module 802 is configured to send a control instruction to the external control valve of the compressor based on a cooling request, so as to provide current to the external control valve through the vehicle current, so that the external control valve adjusts the valve opening.

[0061] The protection module 803 is configured to activate a preset protection strategy to control the external control valve to adjust the current value when it is detected that the working states of the external control valve and the compressor meet preset conditions.

[0062] The control device for the above-mentioned compressor external control valve provided in an embodiment of the present invention sends a control instruction to the external control valve and provides current to the external control valve through the vehicle current when the vehicle has a cooling demand, so that the external control valve adjusts the valve opening and provides corresponding cooling capacity. When it is monitored that the working status of the external control valve and the compressor reaches the preset conditions, the preset protection strategy is activated to adjust the current value of the external control valve, thereby effectively protecting the durability of the compressor and meeting the cooling demand of the entire vehicle. At the same time, it reduces the power demand for the engine under high-speed conditions, improves the customer's driving experience, and reduces the fuel consumption of the entire vehicle.

[0063] In one embodiment, the protection module 803 is specifically used to: when it is monitored that the current value of the external control valve is the maximum operating current value and the speed of the compressor reaches a preset speed, the preset protection strategy is activated to control the compressor external control valve to adjust the current value.

[0064] In one embodiment, the above-mentioned protection module 803 is specifically used to: obtain a protection current value and a current regulation rate based on a pre-calibrated current protection curve; generate a current regulation instruction based on the protection current value and the current regulation rate; and send the current regulation instruction to the external control valve so that the external control valve adjusts the current value of the external control valve to the protection current value according to the current regulation rate.

[0065] In one embodiment, the above-mentioned current protection curve includes: when the current value of the external control valve is the maximum current value, as the speed of the compressor increases, the current value of the external control valve remains unchanged; when the speed of the compressor reaches a preset speed, as the speed of the compressor increases, the current value of the external control valve decreases to a protection current value according to the current regulation rate; when the current value of the external control valve reaches the protection current value, as the speed of the compressor increases, the current value of the external control valve remains unchanged.

[0066] In one embodiment, the above-mentioned control module 802 is specifically used to: obtain the evaporator temperature, the target evaporator temperature and the pressure of the compressor based on the cooling request; calculate the valve opening of the external control valve based on the evaporator temperature, the target evaporator temperature and the pressure of the compressor; determine the target current value of the external control valve based on the valve opening of the external control valve; generate a control instruction based on the target current value, and send the control instruction to the external control valve and provide the target current value to the external control valve through the vehicle current, so that the external control valve can adjust the valve opening.

[0067] In one embodiment, the control instruction includes a first control instruction and a second control instruction; the above-mentioned control module 802 is specifically used to: collect the current value of the external control valve; when the current value of the external control valve is greater than the target current value, the current decrease rate is obtained, and based on the current decrease rate and the target current value, a first control instruction is generated; when the current value of the external control valve is less than the target current value, the current increase rate is obtained, and based on the current increase rate and the target current value, a second control instruction is generated.

[0068] An embodiment of the present invention provides an air-conditioning controller, which controls a compressor using any one of the methods provided in the above embodiments.

[0069] An embodiment of the present invention provides a vehicle, comprising: an air-conditioning controller and a compressor provided in the above embodiment; the air-conditioning controller controls the compressor using any one of the methods provided in the above embodiment.

[0070] It should be noted that the device, air-conditioning controller, and vehicle provided in the embodiments of the present invention have the same implementation principles and technical effects as those of the aforementioned method embodiments. For the sake of brief description, for matters not mentioned in the device, air-conditioning controller, and vehicle embodiments, reference may be made to the corresponding contents in the aforementioned method embodiments.

[0071] The computer program product of a readable storage medium provided in an embodiment of the present invention includes a computer-readable storage medium storing program code. The program code includes instructions that can be used to execute the methods described in the aforementioned method embodiments. For specific implementations, please refer to the aforementioned method embodiments and will not be described in detail here. The specific numerical values ​​provided in the implementation of the present invention are merely exemplary and are not intended to be limiting.

[0072] If the functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0073] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for controlling a compressor external control valve, characterized in that: Applied to air conditioning controllers, including: Receive the user's cooling request and start the compressor; sending a control instruction to an external control valve of the compressor based on the cooling request and supplying current to the external control valve through the vehicle current, so that the external control valve adjusts the valve opening; When it is monitored that the working states of the external control valve and the compressor reach preset conditions, a preset protection strategy is started to control the external control valve to adjust the current value.

2. The method according to claim 1, characterized in that When it is monitored that the working states of the external control valve and the compressor reach the preset conditions, a preset protection strategy is started to control the compressor external control valve to adjust the current value, including: When it is monitored that the current value of the external control valve is the maximum operating current value and the rotation speed of the compressor reaches a preset rotation speed, a preset protection strategy is started to control the external control valve of the compressor to adjust the current value.

3. The method according to claim 1, characterized in that Starting a preset protection strategy to control the compressor external control valve to adjust the current value, including: Based on the pre-calibrated current protection curve, the protection current value and current regulation rate are obtained; generating a current regulation instruction based on the protection current value and the current regulation rate; The current regulation instruction is sent to the external control valve, so that the external control valve regulates the current value of the external control valve to the protection current value according to the current regulation rate.

4. The method according to claim 3, characterized in that The current protection curve includes: When the current value of the external control valve is the maximum current value, as the speed of the compressor increases, the current value of the external control valve remains unchanged; When the speed of the compressor reaches a preset speed, as the speed of the compressor increases, the current value of the external control valve decreases to the protection current value according to the current regulation rate; When the current value of the external control valve reaches the protection current value, the current value of the external control valve remains unchanged as the rotation speed of the compressor increases.

5. The method according to claim 1, wherein Sending a control instruction to an external control valve of the compressor based on the cooling request and providing current to the external control valve through the vehicle current so that the external control valve adjusts the valve opening includes: Based on the cooling request, obtaining an evaporator temperature, a target evaporator temperature, and a compressor pressure; calculating a valve opening of an external control valve based on the evaporator temperature, the target evaporator temperature, and the pressure of the compressor; determining a target current value of the external control valve based on the valve opening of the external control valve; Based on the target current value, a control instruction is generated, and the control instruction is sent to the external control valve. The target current value is provided to the external control valve through the vehicle current, so that the external control valve adjusts the valve opening size.

6. The method according to claim 5, characterized in that The control instruction includes a first control instruction and a second control instruction; Based on the target current value, generating a control instruction includes: collecting the current value of the external control valve; When the current value of the external control valve is greater than the target current value, a current decrease rate is acquired, and a first control instruction is generated based on the current decrease rate and the target current value; When the current value of the external control valve is less than the target current value, a current rising rate is acquired, and a second control instruction is generated based on the current rising rate and the target current value.

7. A control device for a compressor external control valve, characterized in that: Applied to air conditioning controllers, including: A cooling request receiving module is used to receive a cooling request from a user and start the compressor; a control module, configured to send a control instruction to an external control valve of the compressor based on the cooling request and to provide current to the external control valve through the vehicle current, so that the external control valve adjusts the valve opening; The protection module is used to start a preset protection strategy to control the external control valve to adjust the current value when it is monitored that the working status of the external control valve and the compressor reaches a preset condition.

8. An air conditioning controller, characterized in that: The air conditioning controller controls the compressor using the method described in any one of claims 1 to 6.

9. A vehicle, characterized in that: include: The air conditioning controller and compressor as claimed in claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are executed.

Images