Method and system for preventing compressor frequent start-stop in low load scenario
By controlling the battery circuit EXV and the battery water pump, excess cooling capacity is directed into the battery pack cooling circuit, solving the problem of frequent compressor start-stop under low-load conditions and extending the compressor's service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHERY AUTOMOBILE CO LTD
- Filing Date
- 2025-01-02
- Publication Date
- 2026-08-04
AI Technical Summary
In low-load scenarios, the problem of frequent compressor start-stop, especially in spring and autumn when the ambient temperature is low and there is a need for cooling, cannot be effectively solved by existing methods.
By controlling the battery circuit EXV and the battery water pump, the cooling capacity is adjusted to be introduced into the battery pack cooling circuit, consuming excess cooling capacity and avoiding frequent compressor start-stop.
It effectively prevents the compressor from frequently starting and stopping under low load conditions, thus extending the compressor's service life.
Smart Images
Figure CN119900703B_ABST
Abstract
Description
Technical Field
[0001] This disclosure pertains to the field of automotive control technology, and particularly relates to a method and system for preventing frequent start-stop of a compressor under low-load conditions. Background Technology
[0002] In spring and autumn, when the ambient temperature is low and there is a need for cooling, the compressor operates under low load, causing it to start and stop frequently, which in turn affects its lifespan.
[0003] The commonly used solution is to increase the opening of the internal and external circulation dampers to increase the intake of fresh air from outside, thereby maintaining the compressor at a low speed. However, this solution has certain limitations. When the ambient temperature is low enough, even if the circulation dampers are at their maximum opening, the compressor will still start and stop frequently, which cannot fundamentally solve the problem.
[0004] Therefore, it is necessary to provide a new method and system for preventing frequent compressor start-stop in low-load scenarios to solve the above-mentioned technical problems. Summary of the Invention
[0005] The purpose of this disclosure is to provide a method and system for preventing frequent start-stop of compressors in low-load scenarios in order to solve the above-mentioned problems.
[0006] This disclosure achieves the above objectives through the following technical solutions:
[0007] A method for preventing frequent compressor start-stop under low-load conditions includes 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] The difference between the target evaporation temperature and the actual evaporation temperature of the compressor is calculated in real time; a first temperature threshold and a second temperature threshold are set, 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 of this disclosure, the triggering conditions include:
[0012] The compressor speed remains at 1000 rpm for more than 5 seconds;
[0013] The internal and external circulation dampers remain in the fully external position for more than 5 seconds.
[0014] The battery pack cell temperature is above 5℃;
[0015] The airflow is set to the lowest level and maintained 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, control of the battery circuit EXV and the battery water pump can be triggered.
[0018] As a further optimization of this disclosure, the first temperature threshold is set to 2℃ and the second temperature threshold is set to 0℃.
[0019] As a further optimization of this disclosure, the first preset strategy includes: controlling the battery circuit EXV to open in 50 steps, while controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV every 5 steps / s until the difference is less than 2°C, and maintaining the current opening degree of the battery circuit EXV; the second preset strategy includes: decreasing the opening degree of the battery circuit EXV in 10 steps / s until the battery circuit EXV is closed, at which point the battery water pump is turned off, and the current low-load mode is exited.
[0020] A system for preventing frequent compressor start-stop under low-load conditions includes:
[0021] The condition judgment module is used to determine whether the trigger condition is met. If so, it controls the battery circuit EXV and the battery water pump.
[0022] The calculation module is used to calculate the difference between the target evaporation temperature and the actual evaporation temperature of the compressor in real time; and to set 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 of this disclosure, the triggering conditions specifically include:
[0025] The compressor speed remains at 1000 rpm for more than 5 seconds;
[0026] The internal and external circulation dampers remain in the fully external position for more than 5 seconds.
[0027] The battery pack cell temperature is above 5℃;
[0028] The airflow is set to the lowest level and maintained 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, control of the battery circuit EXV and the battery water pump can be triggered.
[0031] As a further optimization of this disclosure, the first temperature threshold is set to 2℃ and the second temperature threshold is set to 0℃.
[0032] As a further optimization of this disclosure, the first preset strategy includes: controlling the battery circuit EXV to open in 50 steps, while controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV every 5 steps / s until the difference is less than 2°C, and maintaining the current opening degree of the battery circuit EXV; the second preset strategy includes: decreasing the opening degree of the battery circuit EXV in 10 steps / s until the battery circuit EXV is closed, at which point the battery water pump is turned off, and the current low-load mode is exited.
[0033] An electronic device 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 through the communication bus;
[0034] Memory, used to store computer programs;
[0035] The processor is used to execute programs stored in memory to implement methods to prevent frequent compressor start-stop under low-load conditions.
[0036] A computer-readable storage medium storing a computer program that, when executed by a processor, implements a method for preventing frequent start-stop of a compressor under low-load conditions.
[0037] The beneficial effects of this disclosure are as follows:
[0038] This disclosure indirectly introduces excess cooling energy into the battery pack cooling circuit by controlling the operation of the battery circuit EXV and the battery water pump. The cooling circuit then transfers this cooling energy to the battery pack body. Since the battery pack body is large, the excess cooling energy can be consumed without the compressor frequently starting and stopping. Attached Figure Description
[0039] Figure 1 This is a flowchart of a method in an embodiment of this disclosure;
[0040] Figure 2 This is a system structure block diagram of an embodiment of this disclosure;
[0041] Figure 3 This is a block diagram of the device structure in an embodiment of this disclosure. Detailed Implementation
[0042] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art 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 frequent compressor start-stop under low-load conditions includes the following steps:
[0044] When the preset triggering conditions are met, the battery circuit EXV (Electronic Expansion Valve) and battery water pump are controlled as follows:
[0045] The difference between the target evaporation temperature and the actual evaporation temperature of the compressor is calculated in real time; a first temperature threshold and a second temperature threshold are set, 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 triggering conditions include:
[0048] The compressor speed remains at 1000 rpm for more than 5 seconds;
[0049] The internal and external circulation dampers remain in the fully external position for more than 5 seconds.
[0050] The battery pack cell temperature is above 5℃;
[0051] The airflow is set to the lowest level and maintained 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, control of the battery circuit EXV and the battery water pump can be triggered.
[0054] The first temperature threshold is set to 2℃, and the second temperature threshold is set to 0℃.
[0055] The first preset strategy includes: controlling the battery circuit EXV to open in 50 steps, while controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV every 5 steps / s until the difference is less than 2°C, and maintaining the current opening degree of the battery circuit EXV.
[0056] The second preset strategy includes: reducing the opening of the battery circuit EXV by 10 steps / second until the battery circuit EXV is closed, at which point the battery water pump is turned off, and the current low-load mode is exited.
[0057] like Figure 2 As shown, embodiments of this disclosure provide a system for preventing frequent compressor start-stop in low-load scenarios, including:
[0058] The condition judgment module 11 is used to determine whether the trigger condition is met. If so, it controls 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 and the actual evaporation temperature of the compressor in real time; and to 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 roles of each module in the above system is detailed in the implementation process of the corresponding steps in the above method, and will not be repeated here.
[0062] For the system embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The system embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this disclosure according to actual needs. Those skilled in the art can understand and implement this without creative effort.
[0063] In the above embodiments, any number of modules can be combined into one module, or any one module can be split into multiple modules. Alternatively, at least some functionality of one or more modules can be combined with at least some functionality of other modules and implemented in one module. At least one of the modules can be at least partially implemented as hardware circuitry, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a System-on-Chip, a System-on-Substrate, a System-on-Package, an Application-Specific Integrated Circuit (ASIC), or any other reasonable method of integrating or packaging circuitry, or implemented in software, hardware, or firmware, or in any suitable combination of any of these three methods. Alternatively, at least one of the modules can be at least partially implemented as a computer program module that, when run, performs a corresponding function.
[0064] See Figure 3 The electronic device provided in the embodiments of this 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 is used to store computer programs;
[0066] When the processor 1110 executes the program stored in the memory 1130, it implements the following method for preventing frequent start-stop of the compressor in low-load scenarios.
[0067] The aforementioned communication bus 1140 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus 1140 can be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, it is represented by only one thick line in the figure, but this does not indicate that there is only one bus or one type of bus.
[0068] The communication interface 1120 is used for communication between the above-mentioned electronic device and other devices.
[0069] The memory 1130 may include random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Optionally, the memory 1130 may also be at least one storage device located remotely from the aforementioned processor 1110.
[0070] The processor 1110 mentioned above 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 gate or transistor logic devices, or discrete hardware components.
[0071] Embodiments of this disclosure also provide a computer-readable storage medium. The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method for preventing frequent compressor start-stop under low-load conditions as described above.
[0072] The computer-readable storage medium may be included in the device / apparatus described in the above embodiments; or it may exist independently and not assembled into the device / apparatus. The computer-readable storage medium carries one or more programs that, when executed, implement a method for preventing frequent compressor start-stop in low-load scenarios according to embodiments of the present disclosure.
[0073] According to embodiments of this disclosure, the computer-readable storage medium can be a non-volatile computer-readable storage medium, such as including, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.
[0074] The embodiments described above are merely examples of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.
Claims
1. A method for preventing frequent start-stop of a compressor in a low load scenario, characterized in that, Includes the following steps: When the preset trigger conditions are met, the battery circuit EXV and the battery water pump are controlled as follows: The difference between the target evaporation temperature and the actual evaporation temperature of the compressor is calculated in real time; a first temperature threshold and a second temperature threshold are set, 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. The triggering conditions include: The compressor speed remains at 1000 rpm for more than 5 seconds; The internal and external circulation dampers remain in the fully external position for more than 5 seconds. The battery pack cell temperature is above 5℃; The airflow is set to the lowest level and maintained 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, control of the battery circuit EXV and the battery water pump can be triggered. The first preset strategy includes: controlling the battery circuit EXV to open in 50 steps, while controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV every 5 steps / s until the difference is less than the first temperature threshold, and maintaining the current opening degree of the battery circuit EXV; the second preset strategy includes: decreasing the opening degree of the battery circuit EXV every 10 steps / s until the battery circuit EXV is closed, at which point the battery water pump is turned off, and the current low-load mode is exited.
2. The method for preventing frequent start-stop of a compressor in a low-load scenario according to claim 1, characterized in that, The first temperature threshold is set to 2℃, and the second temperature threshold is set to 0℃.
3. A system for preventing frequent start-stop of a compressor under low-load conditions, characterized in that, include: The condition judgment module is used to determine whether the trigger condition is met. If so, it controls the battery circuit EXV and the battery water pump. The calculation module is used to calculate the difference between the target evaporation temperature and the actual evaporation temperature of the compressor in real time; and to set 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. The triggering conditions specifically include: The compressor speed remains at 1000 rpm for more than 5 seconds; The internal and external circulation dampers remain in the fully external position for more than 5 seconds. The battery pack cell temperature is above 5℃; The airflow is set to the lowest level and maintained 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, control of the battery circuit EXV and the battery water pump can be triggered. The first preset strategy includes: controlling the battery circuit EXV to open in 50 steps, while controlling the battery water pump to operate at a 50% duty cycle; continuously increasing the number of steps of the battery circuit EXV every 5 steps / s until the difference is less than the first temperature threshold, and maintaining the current opening degree of the battery circuit EXV; the second preset strategy includes: decreasing the opening degree of the battery circuit EXV every 10 steps / s until the battery circuit EXV is closed, at which point the battery water pump is turned off, and the current low-load mode is exited.
4. A system for preventing frequent compressor start-stop in low-load scenarios according to claim 3, characterized in that, The first temperature threshold is set to 2℃, and the second temperature threshold is set to 0℃.
5. 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 through the communication bus; Memory, used to store computer programs; A processor is used to execute a program stored in a memory to implement the method for preventing frequent start-stop of the compressor in a low-load scenario as described in any one of claims 1-2.
6. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for preventing frequent start-stop of the compressor in a low-load scenario as described in any one of claims 1-2.