Method and system for preventing compressor from frequently starting and stopping in low-load scene

Abstract

The invention relates to a method and system for preventing frequent start and stop of a compressor in a low-load scene, and belongs to the technical field of automobile control, and the method comprises the following steps: when a preset triggering condition is met, controlling a battery loop EXV and a battery water pump as follows: calculating a difference value between a target evaporation temperature and an actual evaporation temperature of the compressor in real time; setting a first temperature threshold value and a second temperature threshold value, wherein the first temperature threshold value is greater than the second temperature threshold value; when the difference value is larger than or equal to the first temperature threshold value, a battery loop EXV and a battery water pump are controlled according to a first preset strategy; and when the difference value is smaller than or equal to the second temperature threshold value, the battery loop EXV and the battery water pump are controlled according to a second preset strategy. By controlling the battery loop EXV and the battery water pump to operate, redundant cooling capacity is indirectly guided into the battery pack cooling loop, the cooling capacity is transmitted to the battery pack body through the cooling loop, and the situation that a compressor is started and stopped frequently is avoided.

Description

Technical Field

[0001] The present disclosure belongs to the field of automobile control technology, and in particular, relates to a method and system for preventing a compressor from frequently starting and stopping under a low-load scenario. Background Art

[0002] In spring and autumn, when the external temperature is low and there is a demand for cooling, the compressor is always in a low-load operation state, causing the compressor to start and stop frequently, which in turn affects the service life of the compressor.

[0003] The commonly used solution at present is to increase the opening of the internal and external circulation dampers to increase the intake of external fresh air, thereby maintaining the low speed operation of the compressor. This solution has certain limitations. When the ambient temperature is low enough, even if the circulation damper reaches the maximum opening, the compressor will still start and stop frequently, and the problem cannot be fundamentally solved.

[0004] Therefore, it is necessary to provide a new method and system for preventing the compressor from frequently starting and stopping in low-load scenarios to solve the above technical problems. Summary of the invention

[0005] The purpose of the present disclosure is to provide a method and system for preventing the compressor from frequently starting and stopping in a low-load scenario in order to solve the above-mentioned problem.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A method for preventing a compressor from frequently starting and stopping under a low load scenario comprises the following steps:

[0008] When the preset trigger conditions are met, the battery circuit EXV and the battery water pump are controlled as follows:

[0009] Calculate in real time the difference between the target evaporation temperature of the compressor and the actual evaporation temperature; set a first temperature threshold and a second temperature threshold, wherein the first temperature threshold is greater than the second temperature threshold;

[0010] When the difference is greater than or equal to the first temperature threshold, the battery circuit EXV and the battery water pump are controlled according to the first preset strategy; when the difference is less than or equal to the second temperature threshold, the battery circuit EXV and the battery water pump are controlled according to the second preset strategy.

[0011] As a further optimization solution of the present disclosure, the triggering conditions include:

[0012] The compressor speed is continuously 1000 rpm for more than 5 seconds;

[0013] The internal and external circulation dampers are kept in the full external position for more than 5 seconds;

[0014] The battery pack cell temperature is above 5°C;

[0015] The air volume is at the minimum level and lasts for more than 5 seconds;

[0016] The actual evaporation temperature of the compressor has reached the target evaporation temperature and continues to decrease at a rate of not less than 0.5℃ / s;

[0017] If all the above conditions are met, the battery circuit EXV and the battery water pump can be triggered to be controlled.

[0018] As a further optimization solution of the present disclosure, the first temperature threshold is set to 2°C and the second temperature threshold is set to 0°C.

[0019] As a further optimization scheme of the present disclosure, the first preset strategy includes: controlling the battery circuit EXV to open at 50 steps, and controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV at 5 steps / s until the difference is less than 2°C, and maintaining the current opening of the battery circuit EXV; the second preset strategy includes: reducing the opening of the battery circuit EXV at 10 steps / s until the battery circuit EXV is closed, at which time the battery water pump is turned off to exit the current low load mode.

[0020] A system for preventing a compressor from frequently starting and stopping under low load conditions, comprising:

[0021] The condition judgment module is used to judge whether the trigger condition is met. If so, the battery circuit EXV and the battery water pump are controlled;

[0022] A calculation module, used for calculating the difference between the target evaporation temperature of the compressor and the actual evaporation temperature in real time; setting a first temperature threshold and a second temperature threshold, wherein the first temperature threshold is greater than the second temperature threshold;

[0023] The control module controls the battery circuit EXV and the battery water pump according to a first preset strategy when the difference is greater than or equal to the first temperature threshold; and controls the battery circuit EXV and the battery water pump according to a second preset strategy when the difference is less than or equal to the second temperature threshold.

[0024] As a further optimization solution of the present disclosure, the triggering conditions specifically include:

[0025] The compressor speed is continuously 1000 rpm for more than 5 seconds;

[0026] The internal and external circulation dampers are kept in the full external position for more than 5 seconds;

[0027] The battery pack cell temperature is above 5°C;

[0028] The air volume is at the minimum level and lasts for more than 5 seconds;

[0029] The actual evaporation temperature of the compressor has reached the target evaporation temperature and continues to decrease at a rate of not less than 0.5℃ / s;

[0030] If all the above conditions are met, the battery circuit EXV and the battery water pump can be triggered to be controlled.

[0031] As a further optimization solution of the present disclosure, the first temperature threshold is set to 2°C and the second temperature threshold is set to 0°C.

[0032] As a further optimization scheme of the present disclosure, the first preset strategy includes: controlling the battery circuit EXV to open at 50 steps, and controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV at 5 steps / s until the difference is less than 2°C, and maintaining the current opening of the battery circuit EXV; the second preset strategy includes: reducing the opening of the battery circuit EXV at 10 steps / s until the battery circuit EXV is closed, at which time the battery water pump is turned off to exit the current low load mode.

[0033] An electronic device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0034] Memory, for storing computer programs;

[0035] The processor is used to execute the program stored in the memory to implement a method for preventing the compressor from frequently starting and stopping under low-load scenarios.

[0036] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements a method for preventing a compressor from frequently starting and stopping in a low-load scenario.

[0037] The beneficial effects of the present disclosure are:

[0038] The present invention indirectly introduces excess cold into the battery pack cooling circuit by controlling the battery circuit EXV and the battery water pump operation, and transfers this part of cold to the battery pack body through the cooling circuit. Since the battery pack body is large, the excess cold can be consumed without the frequent start and stop of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a method flow chart in an embodiment of the present disclosure;

[0040] Figure 2 is a system structure block diagram in an embodiment of the present disclosure;

[0041] Figure 3 It is a block diagram of the device structure in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0043] like Figure 1 As shown, a method for preventing the compressor from frequently starting and stopping in a low-load scenario includes the following steps:

[0044] When the preset trigger conditions are met, the battery circuit EXV (Electronic Expansion Valve) and the battery water pump are controlled as follows:

[0045] Calculate in real time the difference between the target evaporation temperature of the compressor and the actual evaporation temperature; set a first temperature threshold and a second temperature threshold, wherein the first temperature threshold is greater than the second temperature threshold;

[0046] When the difference is greater than or equal to the first temperature threshold, the battery circuit EXV and the battery water pump are controlled according to the first preset strategy; when the difference is less than or equal to the second temperature threshold, the battery circuit EXV and the battery water pump are controlled according to the second preset strategy.

[0047] The trigger conditions include:

[0048] The compressor speed is continuously 1000 rpm for more than 5 seconds;

[0049] The internal and external circulation dampers are kept in the full external position for more than 5 seconds;

[0050] The battery pack cell temperature is above 5°C;

[0051] The air volume is at the minimum level and lasts for more than 5 seconds;

[0052] The actual evaporation temperature of the compressor has reached the target evaporation temperature and continues to decrease at a rate of not less than 0.5℃ / s;

[0053] If all the above conditions are met, the battery circuit EXV and the battery water pump can be triggered to be controlled.

[0054] The first temperature threshold is set to 2°C and the second temperature threshold is set to 0°C.

[0055] The first preset strategy includes: controlling the battery circuit EXV to open at 50 steps, and controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV at 5 steps / s until the difference is less than 2°C, and maintaining the current opening of the battery circuit EXV;

[0056] The second preset strategy includes: reducing the opening of the battery circuit EXV at 10 steps / s until the battery circuit EXV is closed, at which time the battery water pump is turned off to exit the current low load mode.

[0057] like Figure 2 As shown, an embodiment of the present disclosure provides a system for preventing a compressor from frequently starting and stopping in a low-load scenario, comprising:

[0058] The condition judgment module 11 is used to judge whether the trigger condition is met, and if so, control the battery circuit EXV and the battery water pump;

[0059] The calculation module 12 is used to calculate the difference between the target evaporation temperature of the compressor and the actual evaporation temperature in real time; set a first temperature threshold and a second temperature threshold, wherein the first temperature threshold is greater than the second temperature threshold;

[0060] The control module 13 controls the battery circuit EXV and the battery water pump according to a first preset strategy when the difference is greater than or equal to the first temperature threshold; and controls the battery circuit EXV and the battery water pump according to a second preset strategy when the difference is less than or equal to the second temperature threshold.

[0061] The implementation process of the functions and effects of each module in the above system is specifically described in the implementation process of the corresponding steps in the above method, which will not be repeated here.

[0062] For the system embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The system embodiment described above is only schematic, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the disclosed solution. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0063] In the above-mentioned embodiment, any multiple of all modules can be combined in one module for implementation, or any one of the modules can be split into multiple modules. Alternatively, at least some functions of one or more of these modules can be combined with at least some functions of other modules and implemented in one module. At least one of all modules can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, a system on a substrate, a system on a package, an application specific integrated circuit (ASIC), or can be implemented by hardware or firmware such as any other reasonable way of integrating or packaging the circuit, or implemented in any one of the three implementation modes of software, hardware and firmware or in a suitable combination of any of them. Alternatively, at least one of all modules can be at least partially implemented as a computer program module, and when the computer program module is run, the corresponding function can be executed.

[0064] See also Figure 3 , an electronic device provided by an embodiment of the present disclosure includes a processor 1110, a communication interface 1120, a memory 1130 and a communication bus 1140, wherein the processor 1110, the communication interface 1120, and the memory 1130 communicate with each other through the communication bus 1140;

[0065] Memory 1130, for storing computer programs;

[0066] The processor 1110 is used to implement the method for preventing the compressor from starting and stopping frequently in a low-load scenario as shown below when executing the program stored in the memory 1130.

[0067] The communication bus 1140 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus 1140 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0068] The communication interface 1120 is used for communication between the above electronic device and other devices.

[0069] The memory 1130 may include a random access memory (RAM) or a non-volatile memory, such as at least one disk memory. Optionally, the memory 1130 may also be at least one storage device located away from the processor 1110.

[0070] The above-mentioned processor 1110 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0071] The embodiment of the present disclosure further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for preventing the compressor from frequently starting and stopping in a low-load scenario as described above is implemented.

[0072] The computer-readable storage medium may be included in the device / apparatus described in the above embodiment; or it may exist independently without being assembled into the device / apparatus. The above computer-readable storage medium carries one or more programs. When the above one or more programs are executed, the method for preventing the compressor from starting and stopping frequently in a low-load scenario according to the embodiment of the present disclosure is implemented.

[0073] According to an embodiment of the present disclosure, a computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0074] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present disclosure. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure.

Claims

1. A method for preventing a compressor from frequently starting and stopping under low load conditions, characterized in that: The following steps are involved: When the preset trigger conditions are met, the battery circuit EXV and the battery water pump are controlled as follows: Calculate in real time the difference between the target evaporation temperature of the compressor and the actual evaporation temperature; set a first temperature threshold and a second temperature threshold, wherein the first temperature threshold is greater than the second temperature threshold; When the difference is greater than or equal to the first temperature threshold, the battery circuit EXV and the battery water pump are controlled according to the first preset strategy; when the difference is less than or equal to the second temperature threshold, the battery circuit EXV and the battery water pump are controlled according to the second preset strategy.

2. A method for preventing the compressor from frequently starting and stopping in a low-load scenario according to claim 1, characterized in that: The trigger conditions include: The compressor speed is continuously 1000 rpm for more than 5 seconds; The internal and external circulation dampers are kept in the full external position for more than 5 seconds; The battery pack cell temperature is above 5°C; The air volume is at the minimum level and lasts for more than 5 seconds; The actual evaporation temperature of the compressor has reached the target evaporation temperature and continues to decrease at a rate of not less than 0.5℃ / s; If all the above conditions are met, the battery circuit EXV and the battery water pump can be triggered to be controlled.

3. A method for preventing the compressor from frequently starting and stopping in a low-load scenario according to claim 1, characterized in that: The first temperature threshold is set to 2°C and the second temperature threshold is set to 0°C.

4. A method for preventing the compressor from frequently starting and stopping in a low-load scenario according to claim 3, characterized in that: The first preset strategy includes: controlling the battery circuit EXV to open at 50 steps, and controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV at 5 steps / s until the difference is less than 2°C, and maintaining the current opening of the battery circuit EXV; the second preset strategy includes: reducing the opening of the battery circuit EXV at 10 steps / s until the battery circuit EXV is closed, at which time the battery water pump is turned off to exit the current low load mode.

5. A system for preventing the compressor from frequently starting and stopping under low load conditions, characterized in that: include: The condition judgment module is used to judge whether the trigger condition is met. If so, the battery circuit EXV and the battery water pump are controlled; A calculation module, used for calculating the difference between the target evaporation temperature of the compressor and the actual evaporation temperature in real time; setting a first temperature threshold and a second temperature threshold, wherein the first temperature threshold is greater than the second temperature threshold; The control module controls the battery circuit EXV and the battery water pump according to a first preset strategy when the difference is greater than or equal to the first temperature threshold; and controls the battery circuit EXV and the battery water pump according to a second preset strategy when the difference is less than or equal to the second temperature threshold.

6. A system for preventing the compressor from starting and stopping frequently in a low-load scenario according to claim 5, characterized in that: The trigger conditions specifically include: The compressor speed is continuously 1000 rpm for more than 5 seconds; The internal and external circulation dampers are kept in the full external position for more than 5 seconds; The battery pack cell temperature is above 5°C; The air volume is at the minimum level and lasts for more than 5 seconds; The actual evaporation temperature of the compressor has reached the target evaporation temperature and continues to decrease at a rate of not less than 0.5℃ / s; If all the above conditions are met, the battery circuit EXV and the battery water pump can be triggered to be controlled.

7. A system for preventing the compressor from starting and stopping frequently in a low-load scenario according to claim 5, characterized in that: The first temperature threshold is set to 2°C and the second temperature threshold is set to 0°C.

8. A system for preventing the compressor from starting and stopping frequently in a low-load scenario according to claim 7, characterized in that: The first preset strategy includes: controlling the battery circuit EXV to open at 50 steps, and controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV at 5 steps / s until the difference is less than 2°C, and maintaining the current opening of the battery circuit EXV; the second preset strategy includes: reducing the opening of the battery circuit EXV at 10 steps / s until the battery circuit EXV is closed, at which time the battery water pump is turned off to exit the current low load mode.

9. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; Memory, for storing computer programs; A processor is used to execute a program stored in a memory to implement a method for preventing the compressor from frequently starting and stopping in a low-load scenario according to any one of claims 1 to 4.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for preventing the compressor from frequently starting and stopping in a low-load scenario according to any one of claims 1 to 4 is implemented.

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