New energy vehicle cooling control method and device, electronic equipment and storage medium

Abstract

Embodiments of the present application provide a new energy vehicle cooling control method and device, electronic equipment and storage medium, relating to the technical field of new energy vehicles, comprising: when the state of the vehicle is a drivable state, obtaining the motor temperature, motor controller temperature, and cooling fan outlet temperature of the vehicle motor system; determining whether the vehicle has a high temperature fault according to the motor temperature, motor controller temperature, and cooling fan outlet temperature; if it is determined that there is no high temperature fault, determining the target cooling strategy of the vehicle motor system from the cooling strategy set according to the motor temperature and motor controller temperature; and cooling the vehicle motor system using the target cooling strategy. Taking the motor temperature and motor controller temperature as the prerequisite for controlling the vehicle cooling can improve the followability of the motor system temperature and the cooling strategy, thereby reducing the risk of high temperature of the motor system device during vehicle operation.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle technology, and in particular to a cooling control method, device, electronic equipment and storage medium for new energy vehicles. Background Technology

[0002] Currently, in the cooling process of electric motor systems in new energy vehicles, the vehicle's coolant temperature is typically used as a prerequisite for whether cooling is to be implemented. During cooling, the vehicle's controller can activate the water pump and cooling fan of the electric motor system to cool the system, depending on the coolant temperature.

[0003] However, when the vehicle is running in cold conditions, the water pump still runs at a fixed speed, which can easily lead to high power consumption. Also, when high-power heat dissipation is required, the water pump and cooling fan cannot keep up with the heat dissipation capacity quickly, which can easily cause some components of the motor system to overheat. Summary of the Invention

[0004] This application provides a cooling control method, device, electronic equipment, and storage medium for new energy vehicles, which can reduce the probability of high temperature in some components of the motor system during driving.

[0005] In a first aspect, embodiments of this application provide a cooling control method for a new energy vehicle, including:

[0006] When the vehicle is in a drivable state, the vehicle's motor temperature, motor controller temperature, and cooling fan outlet temperature are obtained.

[0007] Based on the motor temperature, the motor controller temperature, and the cooling fan outlet temperature, determine whether the vehicle has a high-temperature fault;

[0008] If it is determined that there is no high-temperature fault, then based on the motor temperature and the motor controller temperature, the target cooling strategy for the vehicle's motor system is determined from the set of cooling strategies; different cooling strategies use different cooling parameters and / or cooling devices.

[0009] The vehicle's motor system is cooled using the target cooling strategy.

[0010] Optionally, determining the target cooling strategy for the vehicle's motor system from a set of cooling strategies based on the motor temperature and the motor controller temperature includes:

[0011] Determine the target motor temperature range in which the motor temperature is located, and the target controller temperature range in which the motor controller temperature is located;

[0012] The target cooling strategy is determined based on the target motor temperature range, the target controller temperature range, and the mapping relationship between the motor temperature range, controller temperature range, and cooling strategy in the cooling strategy set.

[0013] Optionally, the set of cooling strategies includes at least one of the following cooling strategies:

[0014] The water pump of the vehicle's motor system is controlled to operate at a first target speed;

[0015] The water pump is controlled to operate at a second target speed, and a third target speed of the cooling fan of the vehicle's motor system is determined based on a pulse width modulation (PWM) adjustment method, and the cooling fan is controlled to operate at the third target speed, wherein the first target speed is less than the second target speed;

[0016] The fourth target speed of the water pump is determined based on the PWM regulation method, and the water pump is controlled to run at the fourth target speed.

[0017] Optionally, determining the fourth target speed of the water pump based on PWM regulation includes:

[0018] Obtain the first temperature rise slope of the motor temperature and the second temperature rise slope of the motor controller temperature;

[0019] The larger of the first temperature rise slope and the second temperature rise slope is taken as the target temperature rise slope;

[0020] Determine the target slope range in which the target temperature rise slope is located;

[0021] The fourth target rotational speed is determined based on the target slope range and the mapping relationship between the slope range and the rotational speed.

[0022] Optionally, cooling the vehicle's motor system using the target cooling strategy includes:

[0023] A control signal is generated based on the target cooling strategy;

[0024] The control signal is filtered.

[0025] The filtered control signal is sent to the cooling device corresponding to the target cooling strategy.

[0026] Optionally, obtaining the vehicle's motor temperature, motor controller temperature, and the cooling fan outlet temperature of the vehicle's motor system includes:

[0027] The temperature collected by the vehicle's motor temperature sensor is obtained and filtered to obtain the motor temperature;

[0028] The temperature collected by the temperature sensor of the vehicle's motor controller is obtained and filtered to obtain the motor controller temperature;

[0029] The temperature collected by the vehicle's cooling fan outlet temperature sensor is obtained and filtered to obtain the cooling fan outlet temperature.

[0030] Optionally, when the vehicle is started, the liquid level in the vehicle's expansion tank is obtained;

[0031] If the liquid level is lower than the preset height, an early warning message for adding liquid will be output;

[0032] If the liquid level is not lower than the preset height, the water pump and cooling fan of the motor system are controlled to enter standby mode.

[0033] Secondly, embodiments of this application provide a cooling control device for a new energy vehicle, comprising:

[0034] The acquisition module is used to acquire the motor temperature, motor controller temperature, and cooling fan outlet temperature of the vehicle when the vehicle is in a drivable state.

[0035] The determination module is used to determine whether the vehicle has a high-temperature fault based on the motor temperature, the motor controller temperature, and the cooling fan outlet temperature.

[0036] The processing module is used to determine, if it is determined that there is no high-temperature fault, a target cooling strategy for the vehicle's motor system from a set of cooling strategies based on the motor temperature and the motor controller temperature; different cooling strategies use different cooling parameters and / or cooling devices.

[0037] A cooling module for cooling the vehicle's motor system using the target cooling strategy.

[0038] Thirdly, this application provides an electronic device, including: a memory and a processor;

[0039] The memory is used to store computer instructions; the processor is used to execute the computer instructions stored in the memory to implement the method of any one of the first aspects.

[0040] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the method of any of the first aspects.

[0041] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the method of any one of the first aspects.

[0042] This application provides a cooling control method, device, electronic device, and storage medium for new energy vehicles. The method involves acquiring the vehicle's motor temperature, motor controller temperature, and cooling fan outlet temperature while the vehicle is in a drivable state. Based on these temperatures, it determines whether the vehicle has a high-temperature fault. If no high-temperature fault is found, a target cooling strategy for the vehicle's motor system is determined from a set of cooling strategies based on the motor and motor controller temperatures. Different cooling strategies employ different cooling parameters and / or cooling devices. The target cooling strategy is then used to cool the vehicle's motor system. By using the motor and motor controller temperatures as prerequisites for controlling vehicle cooling, the correlation between the motor system temperature and the cooling strategy can be improved, thereby reducing the probability of high-temperature risks in the motor system components during vehicle operation. Attached Figure Description

[0043] Figure 1 A schematic diagram of the motor system provided in the embodiments of this application;

[0044] Figure 2 A schematic flowchart of a new energy vehicle cooling control method provided in an embodiment of this application;

[0045] Figure 3 A schematic diagram illustrating the process of the cooling control method for new energy vehicles provided in this application;

[0046] Figure 4 This is a schematic diagram of the PWM regulation process of the water pump provided in this application;

[0047] Figure 5 A schematic diagram of the PWM adjustment process of the cooling fan provided in this application;

[0048] Figure 6 This is a schematic diagram of the structure of the new vehicle cooling control device provided in the embodiments of this application;

[0049] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] In the embodiments of this application, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect, without limiting their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" do not necessarily imply that they are different.

[0052] It should be noted that, in the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0053] Currently, in the cooling process of electric motor systems in new energy vehicles, the vehicle's coolant temperature is typically used as a prerequisite for whether cooling is to be implemented. During cooling, the vehicle's controller can activate the water pump and cooling fan of the electric motor system to cool the system, depending on the coolant temperature.

[0054] Cooling the motor system based on water temperature is a crude cooling method with poor cooling performance. For example, when the vehicle is running in cold conditions, the water pump still runs at a fixed speed, which can easily lead to high power consumption. Also, when high-power heat dissipation is required, the water pump and cooling fan cannot keep up with the heat dissipation capacity, which can easily cause some components of the motor system to overheat.

[0055] In view of this, this application provides a cooling control method for new energy vehicles. By using the temperature of the motor controller and the temperature of the motor as prerequisites for the cooling strategy, the cooling responsiveness can be improved, thereby reducing the probability of high temperature risks in some components of the motor system.

[0056] It should be understood that the new energy vehicles in this application embodiment include pure electric vehicles, hybrid vehicles, range-extended electric vehicles, and fuel cell electric vehicles, etc. This application embodiment does not limit the type of new energy vehicle.

[0057] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be implemented independently or in combination with each other. The same or similar concepts or processes may not be described again in some embodiments.

[0058] Figure 1 This is a schematic diagram of the motor system according to an embodiment of this application, as shown below. Figure 1 As shown, it includes:

[0059] Pulse Width Modulation (PWM) Controlled Electronic Water Pump 1-1, Water Pump Inlet Pipe 1-2, T-Fit 1-3, Expansion Tank Inlet Pipe 1-4, PWM Controlled Cooling Fan Outlet Pipe 1-5, PWM Controlled Cooling Fan 1-6, PWM Controlled Cooling Fan Temperature Sensor 1-7, PWM Controlled Cooling Fan Inlet Pipe 1-8, PWM Controlled Cooling Fan Low-Voltage Relay 1-9, PWM Controlled Cooling Fan PWM2 Controller Wiring Harness 1-10, PWM Controlled Cooling Fan Temperature Acquisition Wiring Harness 1-11, Expansion Tank 1-12, Liquid Level Sensor 1-13, Vehicle Control Controller Unit (VCU) 1-14, Motor temperature sensor 1-15, Motor 1-16, Motor temperature acquisition harness 1-17, Motor inlet pipe 1-18, Instrument 1-19, Motor controller 1-20, Motor controller temperature sensor 1-21, Motor controller internal temperature acquisition harness 1-22, CAN line 1-23, Expansion tank level alarm harness 1-24, PWM-controlled electronic water pump PWM1 controller harness 1-25, PWM-controlled electronic water pump low-voltage relay 1-26, PWM-controlled electronic water pump outlet circuit 1-27.

[0060] VCU1-14 collects the temperature values ​​from the PWM-controlled cooling fan outlet temperature sensor 1-7 via the PWM-controlled cooling fan temperature acquisition harness 1-11 for internal judgment. The motor controller 1-20 collects the temperature of the motor controller and the motor itself, uploading it to the CAN bus, which VCU1-14 then retrieves. VCU1-14 interacts with the instrument 1-19 and the motor controller 1-20 via the CAN bus, and VCU1-14 controls the power supply to the PWM-controlled electronic water pump 1-1 by outputting the low-side control terminal of the PWM-controlled electronic water pump low-voltage relay. VCU1-14 controls the power supply to PWM-controlled cooling fans 1-6 by outputting the low-side control terminal of the low-voltage relay for the PWM-controlled cooling fan. Based on the temperature value obtained from the Controller Area Network (CAN) bus, VCU1-14 outputs the on / off status and speed requirements of PWM-controlled cooling fans 1-6 via PWM2 controller harness 1-10, and outputs the on / off status and speed requirements of PWM-controlled electronic water pump 1-1 via PWM1 controller harness 1-25. VCU1-14 collects the liquid level of expansion tank 1-12 in real time via expansion tank level alarm harness 1-24. If the liquid level is too low, it sends a signal to the CAN bus, triggering an alarm via instrument 1-19. The motor controller 1-20, motor 1-16, and high water temperature also send signals to the CAN bus, triggering an alarm via instrument 1-19.

[0061] Figure 1 The motor system provided in the embodiments of this application has been described. The following section describes its application in... Figure 1 Taking the VCU in the example, the cooling control method for new energy vehicles provided in this application will be described.

[0062] Figure 2 This is a flowchart illustrating the cooling control method for new energy vehicles provided in an embodiment of this application, as shown below. Figure 2 As shown, it includes:

[0063] S201. When the vehicle is in a drivable state, obtain the vehicle's motor temperature, motor controller temperature, and the cooling fan outlet temperature of the vehicle's motor system.

[0064] In this embodiment, the drivable state can be that the vehicle has been successfully started, the high voltage of the control system has been successfully energized, and it can enter the driving state.

[0065] For example, the vehicle's VCU can obtain vehicle status data uploaded by the instrument panel via the CAN bus. If the vehicle status data indicates that the vehicle is in a ready state, it can be determined that the vehicle is in a drivable state.

[0066] When the vehicle is in a drivable state, the VCU can obtain the motor temperature reported by the motor temperature sensor, the motor controller temperature reported by the motor controller temperature sensor, and the cooling fan outlet temperature reported by the cooling fan temperature sensor via the CAN bus.

[0067] S202. Based on the motor temperature, the motor controller temperature, and the cooling fan outlet temperature, determine whether the vehicle has a high-temperature fault.

[0068] In this embodiment, when the VCU obtains the motor temperature, the motor controller temperature, and the cooling fan outlet temperature, it can compare the three temperatures with their corresponding temperature thresholds. If any temperature is greater than the corresponding temperature threshold, it can be determined that the vehicle has a high-temperature fault.

[0069] If all three temperatures mentioned above are less than or equal to their corresponding temperature thresholds, it can be determined that the vehicle does not have a high-temperature fault. The temperature thresholds corresponding to the motor temperature, motor controller temperature, and radiator fan outlet temperature can be determined based on prior knowledge, and this application does not impose any limitations on this.

[0070] Optionally, if the vehicle experiences a high-temperature fault, the VCU can send a warning signal to the instrument panel via the CAN bus, causing the instrument panel to display a high-temperature warning message. For example, a red warning symbol might be displayed on the vehicle's instrument panel to prompt the user to take action.

[0071] S203. If it is determined that there is no high temperature fault, then based on the motor temperature and the motor controller temperature, determine the target cooling strategy for the vehicle's motor system from the cooling strategy set; different cooling strategies use different cooling parameters and / or cooling devices.

[0072] In this embodiment, the cooling device includes, but is not limited to, the water pump and / or cooling fan of the motor system. Cooling parameters may include the rotational speed of the water pump and / or cooling fan. The water pump may be an electric water pump.

[0073] The cooling strategy set includes multiple different cooling strategies, each corresponding to a specific water pump and / or cooling fan speed. Different cooling strategies may correspond to different, or partially different, water pump and / or cooling fan speeds.

[0074] For example, the VCU can determine the target cooling strategy for the vehicle's motor system from a set of cooling strategies based on the relationship between the motor temperature and a preset motor temperature threshold, and the relationship between the motor controller temperature and a preset motor controller temperature threshold.

[0075] Optionally, there can be one or more preset motor temperature thresholds and preset motor controller temperature thresholds.

[0076] In one possible implementation, the target cooling strategy can also be determined as follows:

[0077] For example, the target motor temperature range in which the motor temperature is located and the target controller temperature range in which the motor controller temperature is located are determined; the target cooling strategy is determined based on the target motor temperature range, the target controller temperature range, and the mapping relationship between the motor temperature range, the controller temperature range and the cooling strategy in the cooling strategy set.

[0078] The motor temperature range and the motor controller temperature range can be multiple. Different motor temperature ranges and motor controller temperature ranges have a mapping relationship with the cooling strategies in the cooling strategy set.

[0079] For example, the motor temperature range can be a1-a2, a2-a3, a3-a4, and the motor controller temperature range can be b1-b2, b2-b3, b3-b4. The cooling strategy set includes cooling strategy A, cooling strategy B, and cooling strategy C. Then the mapping relationship can be: the cooling strategy corresponding to a1-a2 && b1-b2 is A, the cooling strategy corresponding to a2-a3 && b2-b3 is B, and the cooling strategy corresponding to a3-a4 && b3-b4 is C.

[0080] The VCU can determine the target motor temperature range based on the relationship between the acquired motor temperature and the motor temperature range, and determine the target motor controller temperature range based on the relationship between the motor controller temperature and the motor controller temperature range.

[0081] For example, if the motor temperature is m, the motor controller temperature is n, a1≤m<a2, and b1≤n<b2, then the corresponding target cooling strategy is cooling strategy A.

[0082] S204. Cool the vehicle's motor system using the target cooling strategy.

[0083] In this embodiment of the application, when the VCU determines the target cooling strategy, it can obtain the cooling parameters and cooling device corresponding to the target cooling strategy, generate a corresponding control signal based on the cooling parameters and cooling device, and send the control signal to the corresponding cooling device so that the cooling device operates according to the control signal to cool the vehicle's motor system.

[0084] For example, if the cooling parameter in the target cooling strategy is 200 rpm and the cooling device is a water pump, the VCU can generate a control signal to control the water pump to run at 200 rpm and send the control signal to the water pump so that the water pump runs at 200 rpm.

[0085] The new energy vehicle cooling control method provided in this application acquires the vehicle's motor temperature, motor controller temperature, and cooling fan outlet temperature while the vehicle is in a drivable state. Based on these temperatures, it determines whether the vehicle has a high-temperature fault. If no high-temperature fault is found, a target cooling strategy for the vehicle's motor system is determined from a set of cooling strategies based on the motor and motor controller temperatures. Different cooling strategies employ different cooling parameters and / or cooling devices. The target cooling strategy is then used to cool the vehicle's motor system. By using the motor temperature and motor controller temperature as prerequisites for controlling vehicle cooling, the tracking accuracy of the motor system temperature and cooling strategy can be improved, thereby reducing the probability of high-temperature risks in the motor system components during vehicle operation.

[0086] Based on the above embodiments, the cooling strategies that may be included in the cooling strategy set will be described below.

[0087] In some embodiments, the cooling strategy set includes at least one of the following cooling strategies:

[0088] Cooling strategy 1: Control the water pump of the vehicle's motor system to operate at a first target speed.

[0089] Cooling Strategy 2: Control the water pump to run at a second target speed, and determine the third target speed of the cooling fan of the vehicle's motor system based on pulse width modulation (PWM) adjustment, and control the cooling fan to run at the third target speed, wherein the first target speed is less than the second target speed.

[0090] Cooling Strategy 3: Determine the fourth target speed of the water pump based on PWM regulation, and control the water pump to run at the fourth target speed.

[0091] Among them, PWM is a very effective technology for controlling analog circuits based on the digital output of a microprocessor. That is, PWM regulation can be a regulation method based on dynamic changes to adjust the speed.

[0092] It should be understood that the first target speed, the second target speed, the third target speed, and the fourth target speed can all be speeds determined based on prior knowledge, and the specific values ​​of these speeds are not limited in the embodiments of this application.

[0093] The following section uses the determination of the fourth target speed of the water pump based on PWM regulation as an example to introduce the PWM regulation process.

[0094] In some embodiments, the fourth target speed of the water pump can be determined based on the PWM regulation method as follows:

[0095] For example, the first temperature rise slope of the motor temperature and the second temperature rise slope of the motor controller temperature are obtained; the larger value of the first temperature rise slope and the second temperature rise slope is taken as the target temperature rise slope; the target slope range in which the target temperature rise slope is located is determined; and the fourth target speed is determined based on the target slope range and the mapping relationship between the slope range and the speed.

[0096] The temperature rise slope can be used to characterize the temperature change range within a preset time. The larger the temperature rise slope, the greater the temperature change range within the preset time.

[0097] The temperature rise slope can be determined by the ratio of the difference between the current temperature and the previous temperature to time.

[0098] It should be understood that the embodiments of this application do not limit the time point corresponding to the temperature of the previous moment. It can be the temperature of the previous detection cycle or the temperature of other moments.

[0099] When the VCU obtains the first temperature rise slope and the second temperature rise slope, it can use the larger value as the target temperature rise slope. In this way, the tracking performance of the motor system temperature and cooling strategy can be further improved.

[0100] When determining the target temperature rise slope, the target temperature rise slope can be determined according to the relationship between the target temperature rise slope and the target slope range. Then, based on the target slope range and the mapping relationship between the slope range and the rotational speed, the rotational speed corresponding to the target slope range is taken as the fourth target rotational speed.

[0101] It should be understood that there can be multiple target slope ranges, and different target slope ranges correspond to different rotational speeds.

[0102] It should be understood that determining the third target speed of the cooling fan of the vehicle's motor system based on pulse width modulation (PWM) adjustment is similar to determining the fourth target speed of the water pump based on PWM adjustment, and will not be elaborated here.

[0103] In some embodiments, to improve the stability of the cooling device control, the VCU can filter the control signal for controlling the cooling device to reduce the impact of interference signals.

[0104] For example, a control signal is generated according to the target cooling strategy; the control signal is filtered; and the filtered control signal is sent to the cooling device corresponding to the target cooling strategy.

[0105] The control signal can be filtered using methods such as Kalman filtering, amplitude limiting filtering, and weighted recursive average filtering. This application does not limit the specific methods used in this embodiment.

[0106] In some embodiments, to reduce interference from other factors during temperature acquisition and transmission, the VCU can process the temperature when acquiring it to improve the accuracy of the acquired temperature.

[0107] For example, the temperature collected by the vehicle's motor temperature sensor is obtained and filtered to obtain the motor temperature; the temperature collected by the vehicle's motor controller temperature sensor is obtained and filtered to obtain the motor controller temperature; the temperature collected by the vehicle's radiator fan outlet temperature sensor is obtained and filtered to obtain the radiator fan outlet temperature.

[0108] In some embodiments, cooling the vehicle's motor system is performed when the vehicle is in a drivable state, and prior to this, a step of determining the liquid level in the vehicle's expansion tank is included.

[0109] For example, when the vehicle is started, the liquid level of the vehicle's expansion tank is obtained; if the liquid level is lower than a preset height, a warning message to add liquid is output; if the liquid level is not lower than the preset height, the water pump of the motor system and the cooling fan of the motor system are controlled to enter standby mode.

[0110] The VCU can collect the liquid level of the expansion tank in real time through the expansion tank level alarm harness. If the liquid level is lower than the preset height, an early warning message will be generated and sent to the CAN bus for alarm through the instrument.

[0111] If the liquid level is not lower than the preset height, the VCU sends a low-side signal to the water pump at pin 1, requesting the water pump to enter standby mode. The VCU also sends a low-side signal to the cooling fan at pin 6, requesting the cooling fan to enter standby mode.

[0112] Optionally, during vehicle operation, the VCU can also collect the expansion tank level in real time and determine whether to issue a warning based on the corresponding level.

[0113] The following will combine Figure 3 The present application will use a specific example to illustrate the cooling control method for new energy vehicles.

[0114] like Figure 3 As shown, the normal operation of the motor controller is divided into three temperature ranges: T01~T02, T02~T03, and T03~T04. T01~T02 is the lower temperature operating range, T02~T03 is the suitable operating range, and T03~T04 is the higher temperature operating range.

[0115] The normal operating temperature range of the motor is divided into three ranges: T11~T12, T12~T13, and T13~T14. T11~T12 is the lower temperature range, T12~T13 is the suitable operating range, and T13~T14 is the higher temperature range.

[0116] It should be understood that the values ​​of T01, T02, T03, T04, T11, T12, T13, and T14 can all be set according to actual needs, and this application embodiment does not limit them.

[0117] When the vehicle starts, the vehicle control unit (VCU) checks if the expansion tank level is below a preset height. If so, it generates a warning message and sends an alarm through the instrument panel, prompting the user to add fluid to the expansion tank. If not, the VCU instructs the water pump and cooling fan to enter standby mode and proceeds to the next judgment step.

[0118] Determine if the vehicle is in the high-pressure READY state; if not, repeat the step of determining the expansion tank level; if so, proceed to the step of determining if the vehicle has a high-temperature fault.

[0119] Determine if the cooling fan outlet is hot, if the motor controller MCU is hot, and if the motor is hot (whether the vehicle has a high-temperature fault). If any of these temperatures is high, report the fault through the instrument panel. If all of these temperatures are low, the VCU will determine the cooling strategy based on the relationship between the motor controller temperature Tmcu and the motor temperature Tm and the temperature range.

[0120] Exemplarily, if T01 ≤ Tmcu < T02 && T11 ≤ Tm < T12, the water pump is controlled to execute the lowest working speed n01, and the cooling fan stops working. Otherwise, it is judged whether T01 ≤ Tmcu < T02 && T12 ≤ Tm < T13. If so, the water pump PWM adjustment is executed, and the cooling fan stops working; if not, it is judged whether T01 ≤ Tmcu < T02 && T13 ≤ Tm < T14. If so, the PWM speed of the cooling fan is adjusted based on the water pump speed n05; if not, it is judged whether T02 ≤ Tmcu < T03 && T11 ≤ Tm < T12. If so, the water pump PWM adjustment is executed, and the cooling fan stops working; if not, it is judged whether T02 ≤ Tmcu < T03 && T12 ≤ Tm < T13. If so, the water pump PWM adjustment is executed, and the cooling fan stops working; if not, it is judged whether T02 ≤ Tmcu < T03 && T13 ≤ Tm < T14. If so, the PWM speed of the cooling fan is adjusted based on the water pump speed n05; if not, it is judged whether T03 ≤ Tmcu < T04 && T11 ≤ Tm < T12. If so, the PWM speed of the cooling fan is adjusted based on the water pump speed n05; if not, it is judged whether T03 ≤ Tmcu < T04 && T12 ≤ Tm < T13. If so, the PWM speed of the cooling fan is adjusted based on the water pump speed n05; if not, it is judged whether T03 ≤ Tmcu < T04 && T13 ≤ Tm < T14. If so, the PWM speed of the cooling fan is adjusted based on the water pump speed n05. If not, the step of judging whether the vehicle is in the high-voltage READY state is re-executed.

[0121] Based on Figure 3 the embodiment, the processes of PWM adjustment of the cooling fan and the water pump will be introduced below in combination with Figure 4 and Figure 5 respectively.

[0122] When performing the processes of PWM adjustment of the cooling fan and the water pump, the electronically controlled water pump of PWM is set to 5 gears, and the PWM-controlled cooling fan is also divided into 5 gears; for the cooling fan, a highest working temperature is set, and when the temperature exceeds this value, an alarm will also be given to control the water temperature from being too high.

[0123] When entering the water pump PWM adjustment stage and the cooling fan PWM adjustment stage, compare the temperature rise slopes of the motor controller and the motor, and process according to the larger value. The maximum slope is defined as Kmax, and 5 slope intervals of <K1, K1~K2, K2~K3, K3~K4, ≥K4 are set. Different water pump speeds and cooling fan speeds are determined according to the relationship between Kmax and the slope intervals.

[0124] Figure 4 is a schematic diagram of the water pump PWM adjustment process, as shown in Figure 4As shown:

[0125] When entering the water pump PWM adjustment stage, at this time the vehicle control unit (VCU) sends a low-side signal of the water pump, requiring the water pump to work; compare the temperature rise slopes of Kmcu and Km, process them according to the maximum value, and define the maximum slope as Kmax. When Kmax < K1, at this time execute the working speed n01 of the water pump; if not, at this time judge that when K1 ≤ Kmax < K2, at this time execute the working speed n02 of the water pump; if not, at this time judge that when K2 ≤ Kmax < K3, at this time execute the working speed n03 of the water pump; if not, at this time judge that when K3 ≤ Kmax < K4, at this time execute the working speed n04 of the water pump, if not, at this time judge that when Kmax ≥ K4, at this time execute the working speed n05 of the water pump.

[0126] Figure 5 It is a schematic diagram of the PWM adjustment process of the cooling fan, as Figure 5 shown:

[0127] When entering the cooling fan PWM adjustment stage, at this time the vehicle control unit (vcu) sends a low-side signal of the cooling fan, requiring the water pump to work; compare the temperature rise slopes of Kmcu and Km, process them according to the maximum value, and define the maximum slope as Kmax. When Kmax < K1, execute the working speed n11 of the cooling fan; if not, at this time judge that when K1 ≤ Kmax < K2, at this time execute the working speed n12 of the cooling fan; if not, at this time judge that when K2 ≤ Kmax < K3, at this time execute the working speed n13 of the cooling fan; if not, at this time judge that when K3 ≤ Kmax < K4, at this time execute the working speed n14 of the cooling fan, if not, at this time judge that when Kmax ≥ K4, at this time execute the working speed n15 of the cooling fan.

[0128] It should be understood that the values of K1 - K4, T11 - T14, n01 - n05, and n11 - n15 can all be set according to actual needs, and the embodiments of the present application do not limit this.

[0129] The present application also provides a cooling control device for a new energy vehicle.

[0130] Figure 6 It is a schematic diagram of the structure of the new energy vehicle cooling control device 60 provided by the embodiment of the present application, as Figure 6 shown, including:

[0131] An acquisition module 601, configured to obtain the motor temperature, the motor controller temperature of the vehicle, and the outlet temperature of the cooling fan of the vehicle motor system when the state of the vehicle is a drivable state;

[0132] The determination module 602 is used to determine whether the vehicle has a high-temperature fault based on the motor temperature, the motor controller temperature, and the cooling fan outlet temperature.

[0133] The processing module 603 is used to determine, if it is determined that there is no high-temperature fault, a target cooling strategy for the vehicle's motor system from a set of cooling strategies based on the motor temperature and the motor controller temperature; different cooling strategies use different cooling parameters and / or cooling devices.

[0134] Cooling module 604 is used to cool the motor system of the vehicle using the target cooling strategy.

[0135] Optionally, the processing module 603 is further configured to determine the target motor temperature range in which the motor temperature is located, and the target controller temperature range in which the motor controller temperature is located; and to determine the target cooling strategy based on the target motor temperature range, the target controller temperature range, and the mapping relationship between the motor temperature range, the controller temperature range and the cooling strategy in the cooling strategy set.

[0136] The cooling strategy set includes at least one of the following cooling strategies:

[0137] The water pump of the vehicle's motor system is controlled to operate at a first target speed.

[0138] The water pump is controlled to operate at a second target speed, and a third target speed of the cooling fan of the vehicle's motor system is determined based on a pulse width modulation (PWM) adjustment method, and the cooling fan is controlled to operate at the third target speed, wherein the first target speed is less than the second target speed.

[0139] The fourth target speed of the water pump is determined based on the PWM regulation method, and the water pump is controlled to run at the fourth target speed.

[0140] Optionally, the processing module 603 is further configured to obtain a first temperature rise slope of the motor temperature and a second temperature rise slope of the motor controller temperature; take the larger value of the first temperature rise slope and the second temperature rise slope as a target temperature rise slope; determine the target slope range in which the target temperature rise slope is located; and determine the fourth target speed based on the target slope range and the mapping relationship between the slope range and the speed.

[0141] Optionally, the cooling module 604 is used to generate a control signal according to the target cooling strategy; filter the control signal; and send the filtered control signal to the cooling device corresponding to the target cooling strategy.

[0142] Optionally, the acquisition module 601 is further configured to acquire the temperature collected by the vehicle's motor temperature sensor, and filter it to obtain the motor temperature; acquire the temperature collected by the vehicle's motor controller temperature sensor, and filter it to obtain the motor controller temperature; acquire the temperature collected by the vehicle's cooling fan outlet temperature sensor, and filter it to obtain the cooling fan outlet temperature.

[0143] Optionally, the determining module 602 is further configured to obtain the liquid level of the vehicle's expansion tank when the vehicle is started; if the liquid level is lower than a preset height, output a warning message to add liquid; if the liquid level is not lower than the preset height, control the water pump of the motor system and the cooling fan of the motor system to enter a standby state.

[0144] The new energy vehicle cooling control device provided in this application embodiment can execute the new energy vehicle cooling control method provided in any of the above embodiments. Its principle and technical effect are similar, and will not be described again here.

[0145] This application also provides an electronic device.

[0146] Figure 7 This is a schematic diagram of the structure of the electronic device 70 provided in the embodiments of this application, such as... Figure 7 As shown, the electronic device 70 may include at least one processor 701, a memory 702, and a communication interface 703.

[0147] The memory 702 is used to store programs. Specifically, the program may include program code, which includes computer operation instructions.

[0148] The memory 702 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0149] The processor 701 is used to execute computer execution instructions stored in the memory 702 to implement the operation of the new vehicle cooling control method described in the foregoing method embodiments. The processor 701 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0150] In practical implementation, if the communication interface 703, memory 702, and processor 701 are implemented independently, they can be interconnected via a bus to complete communication. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc., but this does not imply that there is only one bus or one type of bus.

[0151] Optionally, in a specific implementation, if the communication interface 703, memory 702, and processor 701 are integrated on a single chip, then the communication interface 703, memory 702, and processor 701 can communicate through an internal interface.

[0152] This application also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the technical solution of the above-described medical data transmission method embodiment. Its implementation principle and technical effect are similar, and will not be repeated here.

[0153] In one possible implementation, a computer-readable medium may include random access memory (RAM), read-only memory (ROM), compact discread-only memory (CD-ROM) or other optical disc storage, disk storage or other magnetic storage devices, or any other medium targeted to carry or to store the required program code in the form of instructions or data structures, and accessible by a computer. Furthermore, any connection is appropriately referred to as a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. As used herein, disks and optical discs include optical discs, laser discs, optical discs, Digital Versatile Discs (DVDs), floppy disks, and Blu-ray discs, where disks typically reproduce data magnetically, while optical discs optically reproduce data using lasers. The above combinations should also be included within the scope of computer-readable media.

[0154] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the technical solution of the above-described medical data transmission method embodiment. Its implementation principle and technical effects are similar, and will not be repeated here.

[0155] In the specific implementation of the aforementioned terminal device or server, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules within the processor.

[0156] Those skilled in the art will understand that all or part of the steps in any of the above method embodiments can be implemented by hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, all or part of the steps in the above method embodiments are performed.

[0157] If the technical solution of this application is implemented in software form and sold or used as a product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the technical solution of this application can be embodied in the form of a software product, which is stored in a storage medium and includes a computer program or several instructions. This computer software product causes a computer device (which may be a personal computer, server, network device, or similar electronic device) to execute all or part of the steps of the method described in the embodiments of this application.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cooling control method for new energy vehicles, characterized in that, include: When the vehicle is in a drivable state, the vehicle's motor temperature, motor controller temperature, and cooling fan outlet temperature are obtained. Based on the motor temperature, the motor controller temperature, and the cooling fan outlet temperature, determine whether the vehicle has a high-temperature fault; If it is determined that there is no high temperature fault, then the target motor temperature range in which the motor temperature is located and the target controller temperature range in which the motor controller temperature is located are determined; based on the target motor temperature range, the target controller temperature range, and the mapping relationship between the motor temperature range, the controller temperature range and the cooling strategy in the cooling strategy set, the target cooling strategy is determined. The cooling strategy set includes at least: controlling the water pump of the vehicle's motor system to operate at a first target speed; obtaining a first temperature rise slope of the motor temperature and a second temperature rise slope of the motor controller temperature; taking the larger of the first and second temperature rise slopes as a target temperature rise slope; determining the target slope range in which the target temperature rise slope is located; determining a fourth target speed based on the target slope range and the mapping relationship between the slope range and the speed, and controlling the water pump to operate at the fourth target speed; controlling the water pump to operate at a second target speed; and determining a third target speed of the cooling fan of the vehicle's motor system based on a pulse width modulation (PWM) adjustment method, and controlling the cooling fan to operate at the third target speed, wherein the first target speed is less than the second target speed; The vehicle's motor system is cooled using the target cooling strategy.

2. The method according to claim 1, characterized in that, The cooling of the vehicle's motor system using the target cooling strategy includes: A control signal is generated based on the target cooling strategy; The control signal is filtered. The filtered control signal is sent to the cooling device corresponding to the target cooling strategy.

3. The method according to claim 1, characterized in that, The acquisition of the vehicle's motor temperature, motor controller temperature, and the cooling fan outlet temperature of the vehicle's motor system includes: The temperature collected by the vehicle's motor temperature sensor is obtained and filtered to obtain the motor temperature; The temperature collected by the temperature sensor of the vehicle's motor controller is obtained and filtered to obtain the motor controller temperature; The temperature collected by the vehicle's cooling fan outlet temperature sensor is obtained and filtered to obtain the cooling fan outlet temperature.

4. The method according to claim 1, characterized in that, The method further includes: When the vehicle is started, the liquid level in the vehicle's expansion tank is obtained; If the liquid level is lower than the preset height, an early warning message for adding liquid will be output; If the liquid level is not lower than the preset height, the water pump and cooling fan of the motor system are controlled to enter standby mode.

5. A cooling control device for new energy vehicles, characterized in that, include: The acquisition module is used to acquire the motor temperature, motor controller temperature, and cooling fan outlet temperature of the vehicle when the vehicle is in a drivable state. The determination module is used to determine whether the vehicle has a high-temperature fault based on the motor temperature, the motor controller temperature, and the cooling fan outlet temperature. The processing module is used to determine the target motor temperature range where the motor temperature is located and the target controller temperature range where the motor controller temperature is located if it is determined that there is no high temperature fault; and to determine the target cooling strategy based on the target motor temperature range, the target controller temperature range, and the mapping relationship between the motor temperature range, the controller temperature range and the cooling strategy in the cooling strategy set. The cooling strategy set includes at least: controlling the water pump of the vehicle's motor system to operate at a first target speed; obtaining a first temperature rise slope of the motor temperature and a second temperature rise slope of the motor controller temperature; taking the larger of the first and second temperature rise slopes as a target temperature rise slope; determining the target slope range in which the target temperature rise slope is located; determining a fourth target speed based on the target slope range and the mapping relationship between the slope range and the speed, and controlling the water pump to operate at the fourth target speed; controlling the water pump to operate at a second target speed; and determining a third target speed of the cooling fan of the vehicle's motor system based on a pulse width modulation (PWM) adjustment method, and controlling the cooling fan to operate at the third target speed, wherein the first target speed is less than the second target speed; A cooling module for cooling the vehicle's motor system using the target cooling strategy.

6. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the method of any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, It stores a computer program, which is executed by a processor to implement the method of any one of claims 1-4.

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