A control method and device of a vehicle cooling water pump, a vehicle and a storage medium

Abstract

Embodiments of the present application disclose a control method and device for a vehicle cooling water pump, a vehicle and a storage medium. The method comprises: if the vehicle switches to a whole vehicle shutdown state, disconnecting a power supply circuit between a power battery and a motor; collecting temperature control data at a preset time interval; if the temperature control data meets a preset power-off monitoring condition, keeping a controller in an awake state; and controlling the cooling water pump to be turned on. It can be understood that when the vehicle switches to the whole vehicle shutdown state, the power supply circuit between the power battery and the motor is disconnected during inertia driving, and the cooling water pump is used to cool the electric drive system. Since the power supply circuit between the power battery and the motor is disconnected in the process, the safety of the vehicle can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooling systems, in particular to a control method and device for a vehicle cooling water pump, a vehicle and a storage medium. BACKGROUND

[0002] New energy vehicles usually include an electric drive system, which usually includes a motor, a motor controller, and a circuit composed of power semiconductor devices. When the vehicle is in a whole-vehicle shutdown state, the new energy vehicle (which may also be referred to as "vehicle" in this paper) usually does not disconnect the connection between the power system and the wheel end (i.e., the wheel) from the physical layer, that is, the wheel and the motor are interlocked. In addition, when the vehicle switches to a whole-vehicle shutdown state, it may continue to travel due to inertia. During this process, since the power system and the wheel end remain in a connected state, as the wheels rotate, the wheels drive the motor in reverse, which in turn causes the motor to generate a back electromotive force. The electrical energy generated by the back electromotive force is released in the electric drive system, thereby generating heat, and the accumulation of heat can cause the electric drive system to overheat and be damaged. Therefore, the temperature of the electric drive system should be controlled within a suitable range.

[0003] In related technologies, when the vehicle continues to travel due to inertia after switching to a whole-vehicle shutdown state, the electrical energy generated by the back electromotive force is recovered to the power battery for storage by energy recovery, thereby avoiding the back electromotive force generated by the high-speed operation of the motor, which causes the problem of heat accumulation. However, in order to recover energy, the power supply line between the power battery and the motor should remain in a connected state (i.e., continuously under high voltage). Keeping the power supply line between the power battery and the motor in a connected state increases the safety risk of the vehicle. For example, if a collision accident occurs during energy recovery, the power supply line between the power battery and the motor may not be able to be cut off, which may cause more serious safety accidents due to electrical leakage.

[0004] It should be noted that the information disclosed in the background section of the present application is only intended to deepen the understanding of the general background of the present application, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. SUMMARY

[0005] Therefore, the present application provides a control method and device for a vehicle cooling water pump, a vehicle and a storage medium, to solve the problem that when the vehicle continues to travel due to inertia in a whole-vehicle shutdown state, the electric drive system is cooled by energy recovery, which causes the power supply line between the power battery and the motor to remain in a connected state at all times, which may pose a safety risk.

[0006] In a first aspect, an embodiment of the present application provides a control method for a vehicle cooling water pump, the method comprising:

[0007] If the vehicle switches to the whole vehicle shutdown state, the power supply circuit between the power battery and the motor is disconnected;

[0008] The temperature control data is collected at a preset time interval, and the temperature control data is used to represent an over-temperature state of the thermal management component;

[0009] If the temperature control data meets a preset power-off monitoring condition, the controller remains in the wake-up state;

[0010] The cooling water pump is controlled to be turned on.

[0011] In a possible implementation, the power-off monitoring condition includes at least one of the following conditions:

[0012] A first power-off monitoring condition is used to represent that the thermal management component is likely to overheat in the future;

[0013] A second power-off monitoring condition is used to represent that the thermal management component has already overheated.

[0014] In a possible implementation, the first power-off monitoring condition includes at least one of the following conditions:

[0015] The time length of disconnecting the power supply circuit between the power battery and the motor is less than or equal to a preset time length threshold;

[0016] The motor speed is greater than or equal to a preset first speed threshold.

[0017] In a possible implementation, the second power-off monitoring condition includes at least one of the following conditions:

[0018] The motor temperature is greater than or equal to a preset first temperature threshold;

[0019] The motor controller temperature is greater than or equal to a preset second temperature threshold;

[0020] The on-board charger temperature is greater than or equal to a preset third temperature threshold;

[0021] The DC-DC converter temperature is greater than or equal to a preset fourth temperature threshold.

[0022] In a possible implementation, the control of the cooling water pump to be turned on includes:

[0023] According to the temperature control data, the opening degree of the cooling water pump to be turned on is controlled.

[0024] In a possible implementation, the temperature control data includes the motor speed, and the control of the opening degree of the cooling water pump to be turned on according to the temperature control data includes:

[0025] If the motor speed is greater than or equal to a preset second speed threshold, the cooling water pump is controlled to be opened to a maximum opening degree.

[0026] In a possible implementation, the temperature control data further includes temperatures of the thermal management components, and the controlling the opening degree of the cooling water pump according to the temperature control data further includes:

[0027] If the motor speed is less than the first speed threshold, an opening degree value of the cooling water pump is determined according to the temperatures of the thermal management components.

[0028] The opening degree of the cooling water pump is controlled according to the opening degree value of the cooling water pump.

[0029] In a possible implementation, the number of the thermal management components is a plurality, and the determining the opening degree value of the cooling water pump according to the temperatures of the thermal management components includes:

[0030] An opening degree value corresponding to each of the thermal management components is determined according to the temperature of each of the thermal management components.

[0031] A maximum value in the opening degree values corresponding to all the thermal management components is determined as the opening degree value of the cooling water pump.

[0032] In a second aspect, an embodiment of the present application provides a control device of a cooling water pump of a vehicle, and the device includes:

[0033] A power-off control module is configured to disconnect a power supply line between the power battery and the motor if the vehicle switches to a whole-vehicle shutdown state.

[0034] A data acquisition module is configured to acquire temperature control data at a preset time interval, and the temperature control data is used to represent an over-temperature state of a thermal management component.

[0035] A keep-awake module is configured to control the controller to keep an awake state if the temperature control data meets a preset power-off monitoring condition.

[0036] A water pump control module is configured to control the cooling water pump to be opened.

[0037] In a third aspect, an embodiment of the present application provides a vehicle, and the vehicle includes:

[0038] A controller is configured to execute the method in any one of the first aspect.

[0039] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program, when executed, controls a device where the computer readable storage medium is located to perform the method in any one of the first aspect.

[0040] In the embodiment of the present application, when the vehicle switches to the whole vehicle shutdown state and continues to run due to inertia, the power supply circuit between the power battery and the motor is disconnected, and the cooling water pump is used to cool the electric drive system. Since the power supply circuit between the power battery and the motor is disconnected in this process, the safety of the vehicle can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0042] Figure 1 An application scenario schematic diagram provided by the embodiment of the present application.

[0043] Figure 2 A flowchart of a control method of a cooling water pump of a vehicle provided by the embodiment of the present application.

[0044] Figure 3 A flowchart of a control method of a cooling water pump opening degree provided by the embodiment of the present application.

[0045] Figure 4 A structural schematic diagram of a control device of a cooling water pump of a vehicle provided by the embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0047] It should be clear that the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0048] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0049] It should be understood that the term "and / or" used herein is only to describe an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0050] For ease of understanding, the specific application scenarios are further exemplarily illustrated below.

[0051] Referring to Figure 1 An application scenario schematic diagram is provided for the embodiments of the present application. As shown in Figure 1 The vehicle 100 includes a controller 101, a cooling water pump 102, and an electric drive system 103. Specifically, the vehicle 100 controls the start and stop of the cooling water pump 102 according to temperature control data of the electric drive system 103 through the controller 101.

[0052] The vehicle 100 is a new energy vehicle, which can be a pure electric vehicle or a hybrid vehicle. The pure electric vehicle has only an electric motor as a power source to provide power for the vehicle; the hybrid vehicle has an engine and an electric motor as two power sources to provide power for the vehicle. The vehicle 100 can control the start and stop of the cooling water pump 102 according to the temperature control data of the electric drive system 103 through the controller 101.

[0053] The controller 101 can be a vehicle control unit (VCU) or a power control unit (PCU). If the vehicle 100 is a pure electric vehicle, the controller 101 adopts a VCU; if the vehicle 100 is a hybrid vehicle, the controller 101 adopts a PCU. The controller 101 can obtain the temperature control data of the electric drive system 103 and control the start and stop of the cooling water pump 102 according to the temperature control data.

[0054] The cooling water pump 102 can receive the control signal of the controller 101 and perform start and stop operation according to the control signal. The cooling water pump 102 can flow the coolant along the pipeline of the cooling circuit by pressurizing the coolant to dissipate heat for the electric drive system 103. The cooling water pump 102 can be a mechanical water pump, an electronic water pump, a centrifugal water pump, etc., which is not specifically limited in the embodiments of the present application.

[0055] The electric drive system 103 includes an electric motor, an electric motor controller, a circuit composed of power semiconductor devices, an on-board charger (OBC), a DC-to-DC converter (DCDC), etc.

[0056] In the embodiments of the present application, the components in the electric drive system 103 that can be damaged due to over-temperature can be cooled and dissipated by the cooling circuit in which the cooling water pump 102 is located. These components are collectively referred to as thermal management components. The temperature control data of each thermal management component, such as motor speed, motor temperature, OBC temperature, etc., can be obtained by the controller 101.

[0057] In addition, Figure 1 The vehicle structure shown in the above embodiments is only an exemplary description and should not be regarded as a limitation on the protection scope of the present application.

[0058] Since the new energy vehicle does not disconnect the connection between the power system and the wheel end from the physical layer, that is, the wheels and the motor are interlocked. Therefore, when the vehicle is in a whole vehicle shutdown state, it can continue to travel due to inertia, and the rolling of the wheels can cause the motor to run at a high speed, generating a counter electromotive force, and then generating electric energy. The electric energy is released in the electric drive system, thereby generating heat, and the accumulation of heat can cause the components of the electric drive system to overheat and be damaged.

[0059] In the related art, when the vehicle is in a whole vehicle shutdown state, the motor can run at a high speed, generating electric energy. Generally, through the energy recovery mode, the electric energy is recovered to the power battery for storage, to avoid the problem that the electric energy is released in the electric drive system, causing the components of the electric drive system to overheat and be damaged. However, when energy recovery is performed, the vehicle is usually under high pressure, that is, the power supply line between the power battery and the motor is not disconnected, which can pose a safety risk. For example, during the energy recovery process, a collision accident (such as a car accident) occurs, and if the controller is damaged, the power supply line can always be unable to be disconnected, and if the power supply line is exposed outside due to the collision accident at this time, more serious safety risks such as electric leakage can occur.

[0060] To solve the above problems, in the embodiments of the present application, first, if the vehicle switches to a whole vehicle shutdown state, the power supply line between the power battery and the motor is controlled to be disconnected; second, temperature control data is collected at a preset time interval; then, it is judged whether the preset power-down monitoring condition is met according to the temperature control data, and if the temperature control data meets the preset power-down monitoring condition, the controller remains in an awake state; then, the cooling water pump is controlled to be turned on. It can be understood that when the vehicle switches to a whole vehicle shutdown state, the power supply line between the power battery and the motor is disconnected when the vehicle continues to travel due to inertia, and the cooling water pump is used to cool the electric drive system. Since the power supply line between the power battery and the motor is disconnected during this process, the safety of the vehicle can be improved.

[0061] Specifically, the following detailed description is made in combination with the accompanying drawings and specific embodiments.

[0062] Referring to Figure 2 A flowchart of a control method of a vehicle cooling water pump is provided for the embodiments of the present application. The method can be applied to Figure 1The controller in the application scenario shown. As Figure 2 as shown, mainly comprising the following steps.

[0063] Step S201: If the vehicle switches to the whole vehicle shutdown state, disconnect the power supply line between the power battery and the motor.

[0064] In one possible implementation, the vehicle is switched to the whole vehicle shutdown state by switching the vehicle key state to the ACC or OFF state.

[0065] In one possible implementation, the central control screen is switched to the whole vehicle shutdown state.

[0066] When the vehicle switches to the whole vehicle shutdown state, the power supply line between the power battery and the motor is disconnected, avoiding the safety risk of high voltage. For example, if the power supply line between the power battery and the motor is not disconnected, if a collision accident such as a car accident occurs, the controller may be damaged, resulting in that the power supply line can always be disconnected, and if the power supply line is exposed due to the collision accident, it may bring more serious safety risks such as electric leakage.

[0067] Step S202: Collect temperature control data according to a preset time interval.

[0068] In the embodiment of the application, the temperature control data is a general term for data needed when controlling the temperature of the thermal management component. For example: motor temperature, motor speed, OBC temperature, DCDC temperature, etc.

[0069] In one possible implementation, the controller actively reads the temperature control data from the thermal management component according to the preset time interval. For example, the preset time interval is 1 second, and the thermal management component is provided with a sensor, and the controller actively reads the temperature control data through the sensor on the thermal management component every second.

[0070] In one possible implementation, the controller sends a temperature control data collection instruction to the thermal management component according to the preset time interval, and the thermal management component acquires the temperature control data from the sensor according to the instruction, and sends the temperature control data to the controller.

[0071] In one possible implementation, the controller sends a temperature control data collection instruction to the thermal management component according to the preset time interval, and the thermal management component acquires the temperature control data from the sensor according to the instruction, and sends the temperature control data to the CAN bus, and the controller acquires the temperature control data from the CAN bus.

[0072] Of course, the controller can also acquire the temperature control data in other ways, which is not limited in the embodiment of the application.

[0073] The controller collects data at preset time intervals, which can ensure the real-time performance of temperature control. The shorter the preset time interval, the stronger the real-time performance, the more sensitive the temperature control, and the better the control effect. In addition, when the vehicle is in the whole vehicle shutdown state, collecting data at preset time intervals can also determine whether the temperature is within the allowable range in time, so as to end the temperature control in time and avoid additional energy waste.

[0074] Step S203: If the temperature control data meets the preset power-off monitoring condition, the controller remains in the wake-up state.

[0075] In the embodiments of the present application, the power-off monitoring condition is a preset condition in which the controller determines that the thermal management component may be overheated or has been overheated in the future according to the temperature control data. The preset power-off monitoring condition includes at least one of a first power-off monitoring condition (a preset condition that the thermal management component may be overheated) and a second power-off monitoring condition (a preset condition that the thermal management component has been overheated).

[0076] The first power-off monitoring condition is a preset condition for determining that the thermal management component may be overheated in a future period of time. For example, when the vehicle switches to the whole vehicle shutdown state, all thermal management components may not be in an overheated state, but the motor may still be running at this time, which may generate enough counter electromotive force to cause the thermal management components to release enough electrical energy and accumulate enough heat, resulting in the thermal management components being overheated in a future period of time. At this time, the motor speed is sufficient to cause the thermal management components to be overheated, so it meets the first power-off monitoring condition, i.e., it meets the power-off monitoring condition.

[0077] In one possible implementation, if the temperature control data meets the preset first power-off monitoring condition, the controller remains in the wake-up state.

[0078] When the vehicle is in the whole vehicle shutdown state, if it is analyzed according to the temperature control data that a certain thermal management component may be in an overheated state in the next period of time, the controller remains in the wake-up state, which can timely monitor the temperature of the thermal management component and its related data, such as the motor speed, and thus perform temperature control in advance to avoid damage to the thermal management component due to overheating in a future period of time.

[0079] The first power-off monitoring condition includes at least one of the following conditions:

[0080] The length of time during which the power supply circuit between the power battery and the motor is disconnected is less than or equal to a preset length threshold;

[0081] The motor speed is greater than or equal to a preset first speed threshold, wherein the first speed threshold is a speed threshold at which the counter electromotive force generated by the running motor can cause the thermal management component to heat up after the vehicle switches to the whole vehicle shutdown state.

[0082] In a possible implementation, the controller keeps the wake-up state if the time length of disconnecting the power supply line between the power battery and the motor is less than or equal to a preset time length threshold.

[0083] When the power supply line between the power battery and the motor is disconnected, the temperature of some thermal management components may rise during a transition process from a working state to a stopped state. For example, the speed of the motor needs to go through a process of sliding speed before stopping due to inertia, and during the process of sliding speed, back electromotive force may be generated, causing heat to accumulate in the thermal management components of the electric drive system, and thus the temperature of some thermal management components rises. Therefore, the controller keeps the wake-up state within the preset time length, so as to timely monitor the temperature of the thermal management components, and thus the thermal management components can be cooled in time, avoiding the problem that the thermal management components may be damaged due to over-temperature in the future.

[0084] In a possible implementation, the controller keeps the wake-up state if the motor speed is greater than or equal to a preset first speed threshold.

[0085] When the vehicle is in the whole-vehicle stopped state, if the motor speed is greater than or equal to the preset first speed threshold, the motor operates at a speed greater than the first speed threshold, and the back electromotive force generated thereby can cause the thermal management components to rise in temperature. Therefore, the controller keeps the wake-up state, so as to timely monitor the temperature change of the thermal management components, and thus temperature control can be performed in time, avoiding the problem that the thermal management components may be damaged due to over-temperature in the future.

[0086] The second power-down monitoring condition is a preset condition for judging that the thermal management components have over-temperature. For example, when the vehicle switches from high-speed driving to the whole-vehicle stopped state, some thermal management components may have over-temperature, that is, when the vehicle switches to the whole-vehicle stopped state, the temperature of the thermal management components has been higher than a temperature threshold that the components can withstand, and thus the temperature of the thermal management components is greater than the temperature threshold, meeting the second power-down monitoring condition, that is, meeting the power-down monitoring condition.

[0087] In a possible implementation, the controller keeps the wake-up state if the temperature control data meets a preset second power-down monitoring condition.

[0088] When the vehicle is in the whole-vehicle stopped state, if it is analyzed according to the temperature control data that some thermal management components have over-temperature, the controller keeps the wake-up state to control the temperature of the thermal management components, avoiding the thermal management components from further rising in temperature and thus being damaged.

[0089] The second power-down monitoring condition includes at least one of the following conditions:

[0090] The motor temperature is greater than or equal to a preset first temperature threshold, wherein the first temperature threshold is an over-temperature preset value of the motor, representing a high-temperature critical value that can be tolerated by the motor in a normal working state, and exceeding the temperature may cause damage to the motor or a safety accident;

[0091] The motor controller temperature is greater than or equal to a preset second temperature threshold, wherein the second temperature threshold is an over-temperature preset value of the motor controller, representing a high-temperature critical value that can be tolerated by the motor controller in a normal working state, and exceeding the temperature may cause damage to the motor controller or a safety accident;

[0092] The OBC temperature is greater than or equal to a preset third temperature threshold, wherein the third temperature threshold is an over-temperature threshold of the vehicle-mounted charger, representing a high-temperature critical value that can be tolerated by the OBC in a normal working state, and exceeding the temperature may cause damage to the OBC or a safety accident;

[0093] The DCDC temperature is greater than or equal to a preset fourth temperature threshold, wherein the fourth temperature threshold is an over-temperature threshold of the DCDC, representing a high-temperature critical value that can be tolerated by the DCDC in a normal working state, and exceeding the temperature may cause damage to the DCDC or a safety accident.

[0094] In a possible implementation, if the motor temperature is greater than or equal to the preset first temperature threshold, the controller remains in the wake-up state.

[0095] In a possible implementation, if the motor controller temperature is greater than or equal to the preset second temperature threshold, the controller remains in the wake-up state.

[0096] In a possible implementation, if the OBC temperature is greater than or equal to the preset third temperature threshold, the controller remains in the wake-up state.

[0097] In a possible implementation, if the DCDC temperature is greater than or equal to the preset fourth temperature threshold, the controller remains in the wake-up state.

[0098] When the vehicle is in a whole-vehicle shutdown state, if an over-temperature state exists in the thermal management component in the electric drive system, that is, the temperature of the thermal management component is higher than a preset temperature threshold, the controller remains in the wake-up state, and the temperature of the thermal management component is controlled to avoid further temperature rise of the thermal management component, thereby causing damage.

[0099] In a possible implementation, if the temperature control data does not satisfy the preset power-down monitoring condition, the controller enters the sleep state.

[0100] When the thermal management component in the electric drive system is neither in the overheating state nor in the possible overheating state in the future, the controller does not need to control the temperature of the thermal management component, and then the controller enters the sleep state to save energy consumption.

[0101] Step S204: Control the cooling water pump to start.

[0102] When the power-off monitoring condition is met, the thermal management component needs to be cooled or needs to be pre-cooled. The controller controls the cooling water pump to start, and the cooling water pump pressurizes the cooling liquid to make the cooling liquid circulate along the cooling circuit to take away the heat of the thermal management component in the electric drive system, thereby achieving the cooling effect.

[0103] In the embodiments of the present application, the controller not only controls the start and stop of the cooling water pump, but also controls the opening degree of the cooling water pump. The greater the opening degree of the cooling water pump, the faster the flow rate and the greater the flow of the cooling liquid in the cooling circuit, and the more heat the thermal management component takes away, thereby the more obvious the cooling effect.

[0104] In one possible implementation, the controller controls the opening degree of the cooling water pump to start according to the temperature control data.

[0105] Although the greater the opening degree of the cooling water pump, the more obvious the cooling effect, but the energy consumption will be greater. Therefore, according to the temperature control data, the opening degree of the cooling water pump is appropriately adjusted, which can not only control the temperature of the thermal management component from rising again, but also not waste energy consumption. For example, when the motor temperature is 180℃, the opening degree of the cooling water pump is 80%, which can effectively cool the motor; when the motor temperature is 130℃, the opening degree of the cooling water pump is 30%, which can effectively cool the motor, but if the opening degree of the cooling water pump is still 80%, although it can effectively cool the motor, but the too large opening degree makes the energy consumption of the cooling water pump too high, causing energy waste.

[0106] Referring to Figure 3 A flowchart of a control method of the opening degree of the cooling water pump is provided for the embodiments of the present application. As shown in Figure 3 , it mainly includes the following steps.

[0107] Step S301: Determine whether the motor speed is greater than or equal to a preset second speed threshold.

[0108] In the embodiments of the present application, the second speed threshold is a preset value of the motor speed for controlling the temperature of the thermal management component, indicating the critical speed value of the motor speed at which the back electromotive force generated by the running of the motor can make the temperature of the thermal management component rise to the overheating state after the vehicle switches to the whole vehicle stop state.

[0109] After step S204, the controller determines whether the motor speed is greater than the preset second speed threshold, and performs the subsequent control operation according to the size of the motor speed and the second speed threshold.

[0110] Step S302: Control the cooling water pump to open to the maximum opening degree.

[0111] In a possible implementation, if the motor speed is greater than or equal to the preset second speed threshold, the controller controls the cooling water pump to open to the maximum opening degree.

[0112] When the vehicle switches from the high-speed driving state to the whole vehicle shutdown state, there may be no heat management component in the electric drive system that is in an over-temperature state, but during the process of the motor sliding from high-speed operation to the stop state, back electromotive force may be generated. The higher the motor speed, the greater the back electromotive force generated. If the motor speed is greater than or equal to the second speed threshold at this time, the back electromotive force generated by the motor is too high in the future, causing the electric energy to be released in the electric drive system, thereby causing enough heat to accumulate, causing some heat management components in the electric drive system to overheat and be damaged.

[0113] Therefore, when the vehicle switches to the whole vehicle shutdown state, although there is no heat management component in the electric drive system that is in an over-temperature state, as long as the motor speed is greater than or equal to the preset second speed threshold at this time, the controller controls the cooling water pump to open to the maximum opening degree, and the heat management components in the electric drive system are pre-cooled in advance, thereby avoiding the problem of rapid temperature rise of the heat management components in the future due to untimely cooling and over-temperature damage.

[0114] In addition, when the motor speed is less than the preset second speed threshold, to avoid energy waste, the opening degree of the cooling water pump does not need to be opened to the maximum opening degree. The opening degree of the cooling water pump can be controlled according to other data in the temperature control data except the motor speed, such as the temperature of the heat management component.

[0115] Step S303: Determine the opening degree value of the cooling water pump according to the temperature of the heat management component.

[0116] If the motor speed is less than the preset second speed threshold, the opening degree value of the cooling water pump is determined according to the temperature of the heat management component.

[0117] In a possible implementation, the controller determines the opening degree value of the cooling water pump by calculation according to the functional correspondence between the temperature of each heat management component and the opening degree value of the cooling water pump.

[0118] Through calculation, the opening degree value of the cooling water pump can be more accurate, and the control of the controller on the cooling water pump can be more accurate. However, the calculation amount of the controller is increased, thereby increasing the response time of the controller and reducing the agility of the response of the controller.

[0119] In a possible implementation, the controller determines the opening degree value of the cooling water pump by table lookup.

[0120] For example, if the thermal management component is the motor controller temperature, Table 1 provides a correspondence table between the motor controller temperature and the opening value of the cooling water pump.

[0121] Table 1:

[0122]

[0123] It should be noted that Table 1 is only an exemplary description of the correspondence between the motor controller temperature and the opening value of the cooling water pump. In actual applications, those skilled in the art can determine the correspondence between the two through calculation or testing according to the actual motor controller temperature and the opening value of the cooling water pump.

[0124] The controller can determine the opening value of the cooling water pump according to the motor controller temperature through the correspondence table between the motor controller temperature and the opening value of the cooling water pump. For example, if the motor controller temperature is 100 degrees Celsius, the controller can determine that the opening value of the cooling water pump is 50.

[0125] According to the correspondence table between the motor controller temperature and the opening value of the cooling water pump, the opening value of the cooling water pump usually increases with the increase of the motor controller temperature, so as to increase the cooling effect of the cooling water pump and make the motor controller cool down quickly.

[0126] The controller determines the opening value of the cooling water pump through table lookup, which reduces the calculation amount of the controller and shortens the response time of the controller, so as to make the controller respond more sensitively.

[0127] In the embodiments of the present application, there are multiple thermal management components in the electric drive system, and each thermal management component has a corresponding opening value of the cooling water pump when the vehicle is in a whole vehicle shutdown state. The controller can also determine the final opening value of the cooling water pump according to the opening values of the cooling water pump corresponding to the multiple thermal management components.

[0128] In a possible implementation, the controller determines the opening value corresponding to each thermal management component according to the temperature of each thermal management component.

[0129] The opening value of the cooling water pump can also be determined through the above method according to the temperature of other thermal management components, which will not be described here.

[0130] In a possible implementation, the controller determines the maximum value of the opening values corresponding to all thermal management components as the opening value of the cooling water pump.

[0131] The maximum value in the opening degree values corresponding to all the heat management components is taken as the opening degree value of the cooling water pump, so that the cooling effect of the cooling water pump can meet the cooling demand of all the heat management components, thereby avoiding damage of the heat management components caused by over-temperature to the greatest extent.

[0132] For example, if the heat management components include a motor, a motor controller, an OBC, and a DCDC, the opening degree value of the cooling water pump corresponding to the temperature of each heat management component can be determined by the above method. If the opening degree values of the cooling water pump corresponding to the motor temperature, the motor controller temperature, the OBC temperature, and the DCDC temperature are 50, 45, 60, and 30 respectively, the controller determines the opening degree value of the cooling water pump as the maximum value among the above four opening degree values, that is, the opening degree value of the cooling water pump is determined as 60.

[0133] Step S304: determining the opening of the cooling water pump according to the opening degree value of the cooling water pump.

[0134] The controller sends the opening degree value of the cooling water pump to the cooling water pump, and the cooling water pump adjusts its opening according to the opening degree value, so as to adjust the flow and flow rate of the cooling liquid, and adjust the rate of heat dissipation and cooling.

[0135] Corresponding to the above method embodiment, the present application also provides a control device of a vehicle cooling water pump. Specifically, referring to Figure 4 , a structural schematic diagram of a control device of a vehicle cooling water pump provided by the present application embodiment is shown. As Figure 4 shown, the control device 400 of the vehicle cooling water pump is shown in the figure. The control device 400 of the vehicle cooling water pump includes a power-off control module 401, a data acquisition module 402, a wake-up keeping module 403, and a water pump control module 404. Specifically, the power-off control module 401 is used to disconnect the power supply circuit between the power battery and the motor if the vehicle switches to the whole vehicle shutdown state; the data acquisition module 402 is used to acquire temperature control data at a preset time interval, the temperature control data being used to represent the over-temperature state of the heat management component; the wake-up keeping module 403 is used to control the controller to keep the wake-up state if the temperature control data meets the preset power-off monitoring condition; and the water pump control module 404 is used to control the cooling water pump to start.

[0136] The specific content involved in the present application embodiment can be referred to the description of the above method embodiment, and will not be described again for brevity.

[0137] Corresponding to the above method embodiment, the present application also provides a vehicle. The vehicle specifically includes a controller for executing part or all of the steps in the above method embodiment, and will not be described again for brevity.

[0138] Corresponding to the method embodiments, the present application further provides a computer storage medium, wherein the computer storage medium can store a program, and the program can include some or all steps in each embodiment of the simulation scene generation method provided by the present application when executed. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM) and the like.

[0139] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. The character " / " generally represents that the associated objects before and after it are in an "or" relationship. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c can be single or multiple.

[0140] Those of ordinary skill in the art can realize that the units and algorithm steps described in the embodiments disclosed herein can be realized by electronic hardware, computer software and a combination of electronic hardware and computer software. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0141] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0142] In several embodiments provided in the present application, any function, if realized in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or in part or parts of the technical solutions that make contributions to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0143] The same or similar parts among the various embodiments in the specification can be referred to each other. Especially, for the device embodiments and the terminal embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A control method for a vehicle cooling water pump, characterized in that, The method includes: If the vehicle is switched to a completely stopped state, the power supply line between the power battery and the motor is disconnected; Temperature control data is collected at preset time intervals, and the temperature control data is used to characterize the over-temperature state of the thermal management component. If the temperature control data meets the preset power-down monitoring conditions, the controller remains in the wake-up state; Control the cooling water pump to start; The power-down monitoring conditions include at least one of the following conditions: The first power-down monitoring condition is used to characterize the thermal management component's potential overheating in the future. The second power-down monitoring condition is used to characterize that the thermal management component has overheated; The first power-down monitoring condition includes at least one of the following conditions: The duration of disconnecting the power supply line between the power battery and the motor is less than or equal to a preset duration threshold. The motor speed is greater than or equal to the preset first speed threshold.

2. The method according to claim 1, characterized in that, The second power-down monitoring condition includes at least one of the following conditions: The motor temperature is greater than or equal to the preset first temperature threshold. The motor controller temperature is greater than or equal to the preset second temperature threshold. The on-board charger temperature is greater than or equal to the preset third temperature threshold. The DC-DC converter temperature is greater than or equal to the preset fourth temperature threshold.

3. The method according to claim 1, characterized in that, The control of the cooling water pump to start includes: Based on the temperature control data, the opening degree of the cooling water pump is controlled.

4. The method according to claim 3, characterized in that, The temperature control data includes the motor speed, and controlling the opening degree of the cooling water pump based on the temperature control data includes: If the motor speed is greater than or equal to the preset second speed threshold, the cooling water pump is controlled to start to the maximum opening degree.

5. The method according to claim 4, characterized in that, The temperature control data also includes the temperature of the thermal management component, and controlling the opening degree of the cooling water pump based on the temperature control data further includes: If the motor speed is less than the first speed threshold, the opening value of the cooling water pump is determined based on the temperature of the thermal management component. The opening degree of the cooling water pump is controlled according to the opening value of the cooling water pump.

6. The method according to claim 5, characterized in that, The number of thermal management components is multiple, and determining the opening value of the cooling water pump based on the temperature of the thermal management components includes: The opening value corresponding to each of the thermal management components is determined based on the temperature of each thermal management component; The maximum value among all the opening values ​​corresponding to the thermal management components is determined as the opening value of the cooling water pump.

7. A control device for a vehicle cooling water pump, characterized in that, The device includes: The power-off control module is used to disconnect the power supply line between the power battery and the motor if the vehicle switches to a vehicle shutdown state. The data acquisition module is used to acquire temperature control data at preset time intervals, and the temperature control data is used to characterize the over-temperature state of the thermal management component. The keep-wake module is used to keep the controller in a wake-up state if the temperature control data meets the preset power-down monitoring conditions. The water pump control module is used to control the start-up of the cooling water pump; The power-down monitoring conditions include at least one of the following conditions: The first power-down monitoring condition is used to characterize the thermal management component's potential overheating in the future. The second power-down monitoring condition is used to characterize that the thermal management component has overheated; The first power-down monitoring condition includes at least one of the following conditions: The duration of disconnecting the power supply line between the power battery and the motor is less than or equal to a preset duration threshold. The motor speed is greater than or equal to the preset first speed threshold.

8. A vehicle, characterized in that, include: A controller configured to perform the method of any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 1 to 6.

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