Cooling loop adjusting method and system based on pressure protection and readable storage medium

Abstract

The invention discloses a cooling loop adjusting method and system based on pressure protection and a readable storage medium, and belongs to the field of new energy automobile heat management.The method comprises the steps that the maximum allowable pressure value of a cooling pipeline is obtained through the target flow of a preset cooling loop; according to the maximum allowable pressure value, the maximum cooling allowable flow of the cooling loop is determined; the cooling demand flow of each to-be-cooled component is obtained; based on the cooling demand flow of the multiple to-be-cooled components, the ideal water pump output flow meeting the cooling demand of each to-be-cooled component in the multiple to-be-cooled components is determined; and determining the actual output flow of the water pump according to the maximum cooling allowable flow and the ideal output flow of the water pump. According to the method, the influence of the temperature on the cooling loop is considered, the pressure change is also considered, the flow or the flow change rate of the water pump of the cooling loop can be corrected in time, and the problem of pipeline breakage caused by too high pressure of the cooling loop is solved.

Description

Technical Field

[0001] The present application belongs to the field of thermal management of new energy vehicles, and specifically relates to a cooling circuit adjustment method, system and readable storage medium based on pressure protection. Background Art

[0002] New energy vehicles have high requirements for the sealing and stability of the liquid cooling system. Once the cooling system pipeline ruptures, falls off, or leaks, the vehicle will be unable to supply high voltage, high-voltage components will short-circuit and cause components to burn out, and the vehicle will directly supply high voltage, insulation / short-circuit (internal pipeline rupture of high-voltage components), pipeline rupture without cooling function, components will quickly overheat and stop working, etc. These faults may affect the normal use of the vehicle functions at the least and endanger driving safety at the worst.

[0003] At present, when designing a thermal management system for new energy vehicles, the main principle is to control the cooling system water pump and fan according to the target temperature. When the loop coolant temperature is too high, the system controls the fan and water pump to run at a higher speed. When the loop coolant temperature is lower than the target temperature, the system controls the fan and water pump to run at a medium or low speed or only maintains the water pump to run at a certain speed. In the process of implementing this application, the inventor found that the prior art has at least the following problems: it only considers the adjustment of the coolant target temperature, and does not consider the impact of the cooling circuit pressure change caused by the change in the cooling flow on the cooling circuit function. This single cooling control method may cause the cooling circuit to rupture due to excessive pressure, coolant leakage and other problems. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a cooling circuit regulation method, system and readable storage medium based on pressure protection, which can solve the problem of cooling circuit rupture caused by excessive cooling circuit pressure during cooling regulation of the cooling system through a water pump.

[0005] In order to solve the above technical problems, this application is implemented as follows: In a first aspect, an embodiment of the present application provides a cooling circuit adjustment method based on pressure protection, the method comprising: The maximum allowable pressure value of the cooling pipeline is obtained by presetting the target flow of the cooling circuit; According to the maximum allowable pressure value, determine the maximum allowable cooling flow rate of the cooling circuit; Obtaining the cooling demand flow of each component to be cooled; Determining an ideal output flow rate of a water pump that meets the cooling demand of each of the multiple components to be cooled based on the cooling demand flow rates of the multiple components to be cooled; Determine the actual output flow of the water pump based on the maximum cooling allowable flow and the ideal output flow of the water pump.

[0006] Optionally, the step of obtaining the maximum allowable pressure value of the cooling pipeline by presetting the target flow of the cooling circuit specifically includes: Based on the initial flow, multiple target flows are obtained according to the preset flow increment rule; Controlling the cooling circuit to operate at multiple target flow rates respectively, and obtaining pressure values ​​of multiple cooling pipes corresponding to the multiple target flow rates one by one; Formulate a first calibration table according to the target flow rate and pressure value, wherein the pressure value is the maximum value of the pressure value at each point of the cooling pipeline; Based on the first calibration table, a maximum allowable pressure value of the cooling pipeline is determined.

[0007] Optionally, the step of determining the maximum cooling allowable flow rate of the cooling circuit according to the maximum allowable pressure value specifically includes: Collect the real-time maximum pressure value of the cooling pipeline, wherein the real-time maximum pressure value is the maximum value of the real-time pressure values ​​of multiple points in the cooling pipeline; If the real-time maximum pressure value is less than the maximum allowable pressure value, the target flow corresponding to the maximum allowable pressure value is set as the maximum cooling demand flow of the cooling circuit according to the first calibration table.

[0008] Optionally, the step of obtaining the cooling demand flow of each component to be cooled specifically includes: Based on the calibrated temperature of each component to be cooled and the change in the preset flow rate, the cooling flow rate corresponding to each calibrated temperature is determined, and the cooling flow rate is the minimum flow rate required for the initial temperature of the component to be cooled to no longer rise and to have a downward trend; Establishing a second calibration table according to the calibration temperatures of the plurality of components to be cooled and the plurality of cooling flow rates corresponding thereto; Collect the real-time temperature of each component to be cooled; Based on the second calibration table, the cooling flow corresponding to the real-time temperature is set as the cooling demand flow.

[0009] Optionally, based on the cooling demand flows of the multiple components to be cooled, the step of determining an ideal output flow rate of a water pump that meets the cooling demand of each of the multiple components to be cooled specifically includes: Determine the ideal output flow of the pump according to the following relationship: S T =max{S T1 , S T2 , S T3 , …, S Tn} Among them, S T is the ideal output flow of the pump, S Tn The cooling demand flow corresponding to the real-time temperature of each component to be cooled.

[0010] Optionally, the step of determining the actual output flow rate of the water pump according to the maximum cooling allowable flow rate and the ideal output flow rate of the water pump specifically includes: Determine whether the ideal output flow of the water pump is greater than the maximum cooling allowable flow of the cooling circuit; If yes, the actual output flow of the pump is determined according to the following relationship: S=min{S P0 , S T} If not, determine the actual output flow of the pump according to the following relationship: S=S T <S P0 Among them, S is the actual output flow of the pump, S P0 is the maximum cooling flow rate allowed by the cooling circuit, S T It is the ideal output flow of the pump.

[0011] Optionally, the cooling circuit adjustment method based on pressure protection may further include: Based on the initial flow rate change rate, according to a preset flow rate change rate increasing rule, target flow rate change rates of the plurality of cooling circuits are obtained; Controlling the cooling circuit to operate at a plurality of target flow rate change rates respectively, and obtaining transient pressure values ​​of a plurality of cooling pipes corresponding to the plurality of target flow rate change rates one by one; A third calibration table is formulated according to the target flow rate change rate and the transient pressure value, wherein the transient pressure value is the maximum value of the transient pressure value at each point of the cooling pipeline; Based on the third calibration table, determining a maximum transient allowable pressure value of the cooling circuit; Collect the instantaneous real-time maximum pressure value of the cooling pipeline; If the instantaneous real-time maximum pressure value is less than the maximum instantaneous allowable pressure value, the absolute value of the target flow rate change rate corresponding to the maximum instantaneous allowable pressure value is set as the maximum allowable flow rate change rate according to the third calibration table; The absolute value of the actual output flow rate change rate of the control water pump is not greater than the maximum allowable flow rate change rate.

[0012] In a second aspect, an embodiment of the present application provides a cooling circuit regulation system based on pressure protection, the system comprising: Signal acquisition and processing module: used to detect and collect data on temperature, pressure, flow rate and flow rate change rate, and transmit the data to the control decision module after processing; Control decision module: used to receive the data from the signal acquisition and processing module to generate corresponding control instructions and pass them to the control output module; Control output module: used to receive the control instructions transmitted by the control decision module, and send PWM signals according to the control instructions to drive the processor to complete the corresponding control instructions for the water pump.

[0013] In a third aspect, an embodiment of the present application provides a computer device, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in the first aspect.

[0014] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented.

[0015] In an embodiment of the present application, the pressure of the cooling circuit and the temperature of the components to be cooled in the cooling circuit are monitored in real time, so as to control the flow rate or flow rate change rate of the cooling circuit to adjust the pressure of the cooling circuit so that the pressure of the cooling circuit is within the maximum allowable pressure range that the cooling circuit can withstand; the maximum allowable pressure value of the cooling pipeline is obtained by presetting the target flow rate of the cooling circuit, and this maximum allowable pressure value is the boundary value of the cooling circuit pressure, and the flow rate of the cooling circuit can be controlled according to the maximum allowable pressure value; the maximum cooling allowable flow rate of the cooling circuit is determined according to the maximum allowable pressure value, and the actual output flow rate of the water pump is controlled based on this maximum cooling allowable flow rate as one of the bases; each component to be cooled is obtained. The cooling demand flow of the components is obtained by monitoring the temperature of the components to be cooled in real time, and the flow to be output by the water pump under the ideal state can be obtained; based on the cooling demand flow of multiple components to be cooled, the ideal output flow of the water pump that meets the cooling demand of each component to be cooled is determined, and the actual output flow of the water pump is controlled based on this ideal output flow of the water pump as another basis; according to the maximum cooling allowable flow and the ideal output flow of the water pump, the actual output flow of the water pump is determined, and the water pump outputs this flow value based on the actual output flow of the water pump; and the flow change rate is adjusted so that the absolute value of the actual output flow change rate of the water pump is not greater than the maximum allowable flow change rate. Therefore, the adjustment method can effectively and timely control the water pump flow or flow change rate, thereby adjusting the pressure of the cooling circuit so that it does not exceed the maximum allowable pressure value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of a cooling circuit adjustment method based on pressure protection provided by some embodiments of the present application; Figure 2 is a schematic diagram of a cooling circuit provided by some embodiments of the present application; Figure 3 is a communication principle diagram of a cooling control system provided by some embodiments of the present application; Figure 4 is a flow chart of controlling flow rate change rate based on pressure provided by some embodiments of the present application; Figure 5 It is a structural schematic diagram of a cooling circuit regulation system based on pressure protection provided in some embodiments of the present application. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here. In addition, the "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0019] The following, in conjunction with the accompanying drawings, describes in detail the cooling circuit regulation method, system and readable storage medium based on pressure protection provided by the embodiments of the present application through specific embodiments and their application scenarios.

[0020] In one possible embodiment, see Figure 1 , which is a flow chart of a cooling circuit regulation method based on pressure protection proposed in a possible embodiment of the present application, wherein the proposed method comprises: S101: obtaining a maximum allowable pressure value of the cooling pipeline by presetting a target flow rate of the cooling circuit; S102: Determine the maximum cooling allowable flow rate of the cooling circuit according to the maximum allowable pressure value; S103: Obtaining the cooling demand flow of each component to be cooled; S104: determining an ideal output flow rate of a water pump that satisfies a cooling demand of each of the multiple components to be cooled based on the cooling demand flows of the multiple components to be cooled; S105: Determine the actual output flow rate of the water pump according to the maximum cooling allowable flow rate and the ideal output flow rate of the water pump.

[0021] In this embodiment, the maximum allowable pressure value in step S101 can be obtained by experiments, simulations or optimization algorithms to obtain the correspondence between the target flow of the cooling circuit and the maximum allowable pressure value of the cooling pipe. The correspondence can be made into a first calibration table and stored in a lookup table of the vehicle control unit.

[0022] Optionally, step S101 specifically includes selecting a target vehicle, including selecting a thermal management system, a layout scheme, selecting pipe materials, and the viscosity of the coolant. The pipe materials and the viscosity of the coolant of different vehicles are different, and they are selected according to the actual situation. Pressure gauges are arranged at multiple points in the cooling pipeline, and flow meters are arranged to measure the flow at the output of the water pump, and the test is carried out under different ambient temperature conditions. The test process can be based on the initial flow, according to the preset flow increment rule, to obtain multiple target flow rates; control the cooling circuit to run at multiple target flow rates respectively, and obtain the pressure values ​​of multiple cooling pipelines corresponding to the multiple target flow rates; formulate a first calibration table according to the target flow rate and the pressure value, wherein the pressure value is the maximum value of the pressure value at each point of the cooling pipeline; based on the first calibration table, determine the maximum allowable pressure value of the cooling pipeline.

[0023] It should be noted that the traffic increase rule needs to be analyzed according to the specific actual situation to obtain a reasonable increment and obtain multiple target flows.

[0024] It should be noted that this maximum allowable pressure value is the maximum pressure value that the system can withstand. In order to prevent the maximum pressure corresponding to the target flow from having a tendency and risk of coolant leakage, the maximum allowable pressure value must satisfy the relationship: P0=Pa-△P, where △P is the pressure redundancy value to ensure the safe operation of the system. The redundancy value must be determined according to the specific situation. Pa is the maximum pressure value corresponding to a certain flow rate, and P0 is the maximum allowable pressure value. This maximum allowable pressure value is the maximum pressure value that the system can withstand.

[0025] Table 1 The first calibration table of the target flow rate of the cooling circuit and the maximum allowable pressure value of the cooling pipeline In this embodiment, in step S102, the maximum cooling allowable flow rate of the cooling circuit is determined according to the maximum allowable pressure value. Specifically, the real-time maximum pressure value of the cooling pipeline is collected in real time by a pressure sensor, wherein the real-time maximum pressure value is the maximum value of the real-time pressure values ​​collected by pressure sensors arranged at multiple points in the cooling pipeline; if this real-time maximum pressure value satisfies the condition of being less than the maximum allowable pressure value, then the target flow rate corresponding to the maximum allowable pressure value is set as the maximum cooling demand flow rate of the cooling circuit according to the first calibration table, and the table lookup method can adopt the existing linear interpolation method.

[0026] In this example, see Figure 2 Cooling circuit schematic, Figure 3 The communication schematic diagram of the cooling control system, in which the cooling circuit includes cooling pipelines, water pumps, multiple components to be cooled, low-temperature radiators (fans), auxiliary water tanks, temperature sensors, pressure sensors, etc., in which multiple components to be cooled include DC inverter controllers (DCDC / OBC two-in-one), motor controllers, motor bodies, etc. The principle is to collect data from temperature sensors and pressure sensors, and control the coolant stored in the auxiliary water tank to circulate through each component to be cooled in the cooling pipeline according to the data, and take away the heat generated by it through heat exchange to reduce the temperature, and assist the heat to be dissipated to the external environment through the low-temperature radiator (fan). The greater the flow rate, the more heat is taken away, and the pressure of the cooling pipeline will also increase. The communication principle of the cooling control system is that the cooling controller collects electrical signals from pressure sensors and temperature sensors to obtain temperature and pressure data, in which the cooling controller, high-voltage inverter controller and motor controller are connected through the CAN bus, and the cooling controller is integrated in the vehicle controller.

[0027] In this embodiment, step S103 can obtain the correspondence between the temperatures of multiple components to be cooled and the cooling demand flow rates through experiments, simulations or optimization algorithms. The correspondence can be made into a second calibration table and stored in a lookup table of the vehicle control unit.

[0028] Optionally, the cooling demand flow of each component to be cooled in step S103 can be obtained by determining the cooling flow corresponding to each calibrated temperature based on the calibrated temperature of each component to be cooled and the change in the preset flow, the cooling flow being the minimum flow required when the initial temperature of the component to be cooled no longer rises and has a downward trend, and can ensure that the temperature of the component to be cooled drops back to its reasonable range; a second calibration table is established according to the calibrated temperatures of multiple components to be cooled and the multiple corresponding cooling flows; the real-time temperature of each component to be cooled in the cooling circuit is obtained through communication interaction between the cooler and the components to be cooled in the cooling circuit, the second calibration table is looked up based on the real-time temperature, and the flow corresponding to the real-time temperature is set as the cooling demand flow of the component to be cooled, wherein the table lookup method can adopt an existing linear interpolation method.

[0029] It should be noted that the change in the preset flow rate needs to be analyzed according to the specific actual situation and taken within a reasonable range. The falling back of the component to be cooled to a reasonable temperature range means that the component to be cooled can work normally and ensure its performance in this reasonable temperature range. For example, under normal working conditions, the recommended temperature of the motor controller is not more than 80°C, the motor body (stator) temperature is not more than 135°C, and the IGBT junction temperature of the motor controller is not more than 145°C. Ensuring that the components are in a reasonable temperature range is conducive to improving their operating performance and service life and reducing the occurrence of failures. Different components to be cooled have different reasonable temperature ranges, which need to be determined according to actual conditions.

[0030] It should be noted that the second calibration table includes calibration tables of multiple components to be cooled, such as a calibration table of the correspondence between the calibration temperature of the motor body and the cooling flow rate, a calibration table of the correspondence between the calibration temperature of the motor controller and the cooling flow rate, etc.

[0031] Table 2 Calibration table of motor body temperature and cooling flow in the second calibration table Table 3 Calibration table of motor controller temperature and cooling flow in the second calibration table Table 4 Calibration table of temperature and cooling flow of DC inverter controller (DCDC / OBC two-in-one) in the second calibration table From the above, the other components to be cooled S can be obtained by the same logic Tn Calibration table of temperature and cooling flow.

[0032] In this embodiment, the specific steps of determining the ideal output flow rate of the water pump that meets the cooling demand of each of the multiple components to be cooled based on the cooling demand flow rates of the multiple components to be cooled in step S104 are: The ideal output flow of the pump is calculated according to the following relationship: S T =max{S T1 , S T2 , S T3 , …, S Tn} Among them, S T is the ideal output flow of the pump, S Tn The cooling demand flow rate corresponding to the real-time temperature of each component to be cooled. The maximum value is taken as the ideal output flow rate of the water pump, which can ensure that the ideal output flow rate of the water pump can meet the cooling demand of all components to be cooled.

[0033] In this embodiment, the specific steps of determining the actual output flow rate of the water pump according to the maximum cooling allowable flow rate and the ideal output flow rate of the water pump in step S105 are: Determine whether the ideal output flow of the water pump is greater than the maximum cooling allowable flow of the cooling circuit; If yes, the actual output flow of the pump is determined according to the following relationship: S=min{S P0 , S T} If not, determine the actual output flow of the pump according to the following relationship: S=S T <S P0 Among them, S is the actual output flow of the pump, S P0 is the maximum cooling flow rate allowed by the cooling circuit, S T It is the ideal output flow of the pump.

[0034] It should be noted that if the ideal output flow rate of the water pump is greater than the maximum cooling allowable flow rate of the cooling circuit, it means that the pressure of the cooling circuit caused by the ideal output flow rate of the water pump will exceed the maximum cooling allowable pressure of the cooling circuit, causing the cooling pipeline to burst, thereby making the components in the cooling circuit unable to function. The purpose of taking the maximum cooling allowable flow rate of the cooling circuit as the ideal output flow rate of the water pump is to ensure the safety of the cooling circuit and prevent excessive pressure in the cooling pipeline.

[0035] It should be noted that if the ideal output flow of the water pump is less than the maximum cooling allowable flow of the cooling circuit, the actual output flow of the water pump is equal to the ideal output flow of the water pump and less than the maximum cooling allowable flow of the cooling circuit, ensuring that the pressure caused by the actual output flow of the water pump is not higher than the maximum cooling allowable pressure of the cooling circuit while enabling the components to be cooled to be fully cooled.

[0036] In summary, by real-time monitoring of the pressure of the cooling circuit and the temperature of the components to be cooled in the cooling circuit, the flow rate or flow rate change rate of the cooling circuit is controlled to adjust the pressure of the cooling circuit so that the pressure of the cooling circuit is within the maximum allowable pressure range that the cooling circuit can withstand; by presetting the target flow rate of the cooling circuit, the maximum allowable pressure value of the cooling pipeline is obtained, and this maximum allowable pressure value is the boundary value of the cooling circuit pressure, and the flow rate of the cooling circuit can be controlled according to the maximum allowable pressure value; according to the maximum allowable pressure value, the maximum cooling allowable flow rate of the cooling circuit is determined, and the actual output flow rate of the water pump is controlled based on this maximum cooling allowable flow rate as one of the bases; the cooling demand flow rate of each component to be cooled is obtained, and the cooling demand flow rate of all components to be cooled is obtained by real-time monitoring of the temperature of the components to be cooled, so that the flow rate to be output by the water pump under the ideal state can be obtained; based on the cooling demand flow rates of multiple components to be cooled, the ideal output flow rate of the water pump that meets the cooling demand of each component to be cooled in the multiple components to be cooled is determined, and the actual output flow rate of the water pump is controlled based on this ideal output flow rate of the water pump as another basis; according to the maximum cooling allowable flow rate and the ideal output flow rate of the water pump, the actual output flow rate of the water pump is determined, and the water pump outputs this flow value based on this actual output flow rate of the water pump. Therefore, the regulation method can effectively and timely control the water pump flow rate and thus regulate the pressure of the cooling circuit so that it does not exceed the maximum allowable pressure value.

[0037] In one possible embodiment, see Figure 4The cooling circuit regulation method based on pressure protection may also include the step of regulating the cooling circuit pressure by controlling the flow rate change rate: S401: based on the initial flow rate change rate, according to the preset flow rate change rate increasing rule, obtaining the target flow rate change rate of multiple cooling circuits; S402: controlling the cooling circuit to operate at multiple target flow rate change rates respectively, and obtaining the transient pressure values ​​of multiple cooling pipes corresponding to the multiple target flow rate change rates; S403: formulating a third calibration table according to the target flow rate change rate and the transient pressure value, wherein the transient pressure value is the maximum value of the transient pressure value at each point of the cooling pipe ; S404: Based on the third calibration table, determine the maximum transient allowable pressure value of the cooling circuit; S405: Collect the transient real-time maximum pressure value of the cooling pipe through the pressure sensor; S406: Where the transient real-time maximum pressure value meets the condition of being less than the maximum transient allowable pressure value, then according to the third calibration table, the absolute value of the target flow change rate corresponding to the maximum transient allowable pressure value is set as the maximum allowable flow change rate, and the table lookup method can adopt the existing linear interpolation method; S407: Under all working conditions, the absolute value of the actual output flow change rate of the water pump is controlled to be no greater than the maximum allowable flow change rate.

[0038] It should be noted that the increasing rule of the flow rate change rate in S401 needs to be analyzed according to the specific actual situation to obtain a reasonable increasing amount and obtain multiple target flow rates. Optionally, the maximum allowable flow change rate in S406 can be obtained by experiments, simulations or optimization algorithms to obtain the correspondence between the target flow rate of the cooling circuit and the maximum transient allowable pressure value of the cooling pipeline. The third calibration table made from the correspondence can be stored in the lookup table of the vehicle control unit.

[0039] Table 5 The third calibration table of the target flow rate change rate of the cooling circuit and the transient pressure value of the cooling pipeline Optionally, in S407, the actual output flow rate change rate of the water pump is controlled to be not greater than the maximum allowable flow rate change rate under all working conditions. Specifically, when identifying the need to stop the water pump, the on-off state of the water pump relay, the duty cycle value of the water pump, etc. can be used for judgment; when identifying the need to power off the entire vehicle, the vehicle starting switch state can be used for judgment. Currently, most cooling water pumps on the entire vehicle are controlled by voltage duty cycle. For example, the duty cycle and flow characteristics of a certain water pump are as follows: when PWM is 0, the water pump stops; when PWM is in the (0, 7%) range, it runs at maximum speed; when PWM is When the PWM is in the interval of (7%, 12%), the water pump stops; when the PWM is in the interval of (12%, 17%), the water pump runs at the minimum speed; when the PWM is in the interval of (17%, 93%), the water pump speed runs linearly (the duty cycle is positively correlated with the water pump speed); when the PWM is in the interval of (93%, 100%), the water pump runs at the maximum speed. The operating speed of the water pump is linearly corresponding to the water pump flow rate (the faster the water pump speed, the greater the output water flow rate). Therefore, the flow change rate of the water pump can be controlled by changing the duty cycle sent to the water pump.

[0040] The above-mentioned step of regulating the cooling circuit pressure by controlling the flow change rate can avoid the problem of damage to the cooling circuit due to excessive transient pressure caused by water hammer effect caused by too fast instantaneous change of water pump flow or shutdown by controlling the flow change rate.

[0041] In one possible embodiment, see Figure 5 , shown is a schematic diagram of the structure of a cooling circuit regulation system based on pressure protection, the system includes: Signal acquisition and processing module 501: used to detect and acquire data on temperature, pressure, flow rate and flow rate change rate, and transmit the data to the control decision module after processing; Control decision module 502: used to receive the data from the signal acquisition and processing module to generate corresponding control instructions and pass them to the control output module; The control output module 503 is used to receive the control instruction transmitted by the control decision module, and send a PWM signal according to the control instruction to control the flow change or flow change rate of the water pump, and control the speed of the low-temperature radiator (fan).

[0042] Optionally, an embodiment of the present application also provides a computer device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, each process of the above-mentioned cooling circuit adjustment method embodiment based on pressure protection is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0043] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned cooling circuit adjustment method embodiment based on pressure protection are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0044] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0045] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0046] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0047] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A cooling circuit adjustment method based on pressure protection, applied to new energy vehicles, wherein the cooling circuit includes a cooling pipe, a water pump and a plurality of components to be cooled, characterized in that: The method comprises: Obtaining a maximum allowable pressure value of the cooling pipeline by presetting a target flow rate of the cooling circuit; Determining a maximum cooling allowable flow rate of the cooling circuit according to the maximum allowable pressure value; Obtaining the cooling demand flow of each component to be cooled; Determining an ideal output flow rate of a water pump that satisfies the cooling demand of each of the plurality of components to be cooled based on the cooling demand flow rates of the plurality of components to be cooled; The actual output flow rate of the water pump is determined according to the maximum cooling allowable flow rate and the ideal output flow rate of the water pump.

2. The cooling circuit adjustment method based on pressure protection according to claim 1, characterized in that: The step of obtaining the maximum allowable pressure value of the cooling pipeline by presetting the target flow of the cooling circuit specifically includes: Based on the initial flow, according to a preset flow increment rule, a plurality of target flows are obtained; Controlling the cooling circuit to operate at a plurality of the target flow rates respectively, and obtaining pressure values ​​of a plurality of the cooling pipes corresponding to the plurality of the target flow rates one by one; Formulate a first calibration table according to the target flow rate and the pressure value, wherein the pressure value is the maximum value of the pressure value at each point of the cooling pipeline; Based on the first calibration table, a maximum allowable pressure value of the cooling pipeline is determined.

3. The cooling circuit adjustment method based on pressure protection according to claim 2, characterized in that: The step of determining the maximum cooling allowable flow rate of the cooling circuit according to the maximum allowable pressure value specifically includes: Collecting the real-time maximum pressure value of the cooling pipeline, wherein the real-time maximum pressure value is the maximum value of the real-time pressure values ​​of multiple points of the cooling pipeline; If the real-time maximum pressure value is less than the maximum allowable pressure value, the target flow corresponding to the maximum allowable pressure value is set as the maximum cooling demand flow of the cooling circuit according to the first calibration table.

4. The cooling circuit adjustment method based on pressure protection according to claim 1, characterized in that: The step of obtaining the cooling demand flow of each component to be cooled specifically includes: Based on the calibrated temperature of each component to be cooled and the change in the preset flow rate, determining the cooling flow rate corresponding to each calibrated temperature, the cooling flow rate being the minimum flow rate required for the initial temperature of the component to be cooled to no longer rise and to have a downward trend; Establishing a second calibration table according to the calibration temperatures of the plurality of components to be cooled and the plurality of cooling flow rates corresponding thereto; Collecting the real-time temperature of each component to be cooled; Based on the second calibration table, the cooling flow corresponding to the real-time temperature is set as the cooling demand flow.

5. The cooling circuit adjustment method based on pressure protection according to claim 4, characterized in that: The step of determining the ideal output flow rate of the water pump that meets the cooling demand of each of the plurality of components to be cooled based on the cooling demand flow rates of the plurality of components to be cooled specifically includes: The ideal output flow of the water pump is determined according to the following relationship: S T =max{S T1 ,S T2 ,S T3 ,…,S Tn } Among them, S T is the ideal output flow of the water pump, S Tn The cooling demand flow rate corresponding to the real-time temperature of each component to be cooled.

6. The cooling circuit adjustment method based on pressure protection according to claim 5, characterized in that: The step of determining the actual output flow rate of the water pump according to the maximum cooling allowable flow rate and the ideal output flow rate of the water pump specifically includes: Determining whether the ideal output flow of the water pump is greater than the maximum cooling allowable flow of the cooling circuit; If yes, the actual output flow of the water pump is determined according to the following relationship: S=min{S P0 ,S T } If not, the actual output flow of the water pump is determined according to the following relationship: S=S T <S P0 Where S is the actual output flow of the water pump, S P0 is the maximum cooling flow rate allowed by the cooling circuit, S T is the ideal output flow of the water pump.

7. The cooling circuit adjustment method based on pressure protection according to claim 1, characterized in that: The method further comprises: Based on the initial flow rate change rate, according to a preset flow rate change rate increasing rule, a target flow rate change rate of the plurality of cooling circuits is obtained; Controlling the cooling circuit to operate at a plurality of target flow rate change rates respectively, and obtaining a plurality of transient pressure values ​​of the cooling pipes corresponding to the plurality of target flow rate change rates one by one; A third calibration table is formulated according to the target flow rate change rate and the transient pressure value, wherein the transient pressure value is the maximum value of the transient pressure value at each point of the cooling pipeline; Based on the third calibration table, determining a maximum transient allowable pressure value of the cooling circuit; Collecting the instantaneous real-time maximum pressure value of the cooling pipeline; If the instantaneous real-time maximum pressure value is less than the maximum instantaneous allowable pressure value, then according to the third calibration table, the absolute value of the target flow rate change rate corresponding to the maximum instantaneous allowable pressure value is set as the maximum allowable flow rate change rate; The absolute value of the actual output flow rate change rate of the water pump is controlled to be no greater than the maximum allowable flow rate change rate.

8. A cooling circuit regulation system based on pressure protection, characterized in that: The system comprises: Signal acquisition and processing module: used to detect and collect data on temperature, pressure, flow rate and flow rate change rate, and transmit the data to the control decision module after processing; Control decision module: used to receive the data from the signal acquisition and processing module to generate corresponding control instructions and pass them to the control output module; Control output module: used to receive the control instructions transmitted by the control decision module, and send PWM signals according to the control instructions to drive the processor to complete the corresponding control instructions.

9. A computer device, characterized in that: The computer device includes a memory, a processor, and a processing program stored in the memory and executable on the processor. When the processing program is executed by the processor, the cooling circuit regulation method based on pressure protection according to any one of claims 1 to 7 is implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by the processor, the steps of the cooling circuit regulation method based on pressure protection as described in claims 1-7 are implemented.

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