Control system, vehicle domain controller, vehicle and control method thereof

Abstract

The invention provides a control system, a whole vehicle domain controller, a vehicle and a control method thereof, the control system is applied to the vehicle, the vehicle comprises a temperature control loop, the temperature control loop comprises a temperature controlled component and an electronic water pump, and the control system comprises a temperature acquisition unit used for acquiring temperature information of a heat-conducting medium in the temperature control loop; the whole vehicle domain controller comprises a signal input end and a power output end, the signal input end is connected with the temperature acquisition unit so as to receive the temperature information of the heat-conducting medium, and the power output end is used for being connected with the electronic water pump so as to output a driving signal to the electronic water pump; the whole vehicle domain controller is used for determining a target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium; and according to the target rotating speed ratio, the driving signal is adjusted so that the rotating speed of the electronic water pump can be matched with the target rotating speed ratio.

Description

Technical Field

[0001] The present application relates to the field of automotive thermal management technology, and in particular to a control system, a vehicle domain controller, a vehicle and a control method thereof. Background Art

[0002] With the continuous development of the automobile industry, the demand for temperature control in vehicle components, controllers and passenger compartments is increasing, which plays an important role in the safety and comfort of the vehicle. A vehicle usually contains multiple temperature control loops, each of which is equipped with an electronic water pump and a temperature-controlled component. By controlling the speed of the electronic water pump, the entire temperature control loop is controlled, thereby achieving temperature regulation of the temperature-controlled component.

[0003] In the related art, the control method of the electronic water pump includes the following two forms: one is to set a water pump CAN controller between the electronic water pump and the vehicle controller, the water pump CAN controller can receive the control signal of the vehicle controller through the CAN bus, and control the operation of the electronic water pump according to the control signal; at the same time, the water pump CAN controller also feeds back the state of the electronic water pump to the vehicle controller through the CAN bus, and the control system realizes the control of the electronic water pump through the CAN bus. Another control method of the electronic water pump is to set a thermal management domain controller in the vehicle specifically for thermal management of the vehicle, which can realize direct drive of the electronic water pump without different configurations for different electronic water pumps.

[0004] However, the above two methods still have some problems: the method based on the water pump CAN controller requires the installation of wiring harnesses between the water pump CAN controller and the vehicle controller and between the water pump CAN controller and the electronic water pump, and also requires the reservation of space for the water pump CAN controller in the front cabin of the vehicle. The method of using the thermal management domain controller to control the water pump requires a customized design based on the configuration of the vehicle model, and can only be reused on vehicles with similar thermal management system circuit requirements.

[0005] Therefore, how to improve the integration and reusability of the water pump control solution in the thermal management system has become an urgent problem to be solved. Summary of the invention

[0006] The embodiments of the present application provide a control system, a vehicle domain controller, a vehicle and a control method thereof. Various aspects of the design of the embodiments of the present application are introduced below.

[0007] In a first aspect, a control system is provided, which is applied to a vehicle, wherein the vehicle includes a temperature control loop, the temperature control loop includes a temperature-controlled component and an electronic water pump, and the control system includes: a temperature acquisition unit, which is used to acquire temperature information of a heat-conducting medium in the temperature control loop; a whole vehicle domain controller, which includes a signal input terminal and a power output terminal, the signal input terminal is connected to the temperature acquisition unit to receive the temperature information of the heat-conducting medium, and the power output terminal is used to connect to the electronic water pump to output a drive signal to the electronic water pump; the whole vehicle domain controller is used to: determine a target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium; and, according to the target speed ratio, adjust the drive signal so that the speed of the electronic water pump matches the target speed ratio.

[0008] According to the above technical means, by integrating the input interface of the temperature acquisition unit and the control interface of the direct-drive electronic water pump on the vehicle domain controller of the control system, the vehicle domain controller directly controls the output of the water pump, further improving the integration of the vehicle thermal management system and realizing direct-drive control of the water pump. The direct-drive water pump control of the vehicle domain controller optimizes the loop control of thermal management from the system level, and moves the control capability of components to a controller with higher integration, thereby opening up the state and interface capabilities to more functional domains, and the integrated thermal management system can adapt to the needs of more thermal management systems.

[0009] In some embodiments, the vehicle domain controller is also used to: obtain status information of the temperature-controlled component through a CAN bus, the status information including the internal temperature, required target temperature and cooling flow requirement of the temperature-controlled component; determine the target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium, including: querying a preset mapping relationship table according to the temperature information of the heat-conducting medium and the status information of the temperature-controlled component to determine the target speed ratio of the electronic water pump.

[0010] According to the above means, the vehicle domain controller obtains the status information of the temperature-controlled component through the CAN bus, and judges the status of the temperature control loop based on the status information and the temperature information of the heat-conducting medium in the temperature control loop using the thermal management software integrated in the vehicle domain controller, determines the target speed ratio of the electronic water pump, and drives the electronic water pump according to the set logic, so that the status of the temperature control loop matches the needs of the temperature-controlled component.

[0011] In some embodiments, the vehicle domain controller is also used to: obtain a working status request of the temperature control loop; determine a target speed ratio of the electronic water pump in response to the working status request; and adjust the drive signal according to the target speed ratio so that the working status of the temperature control loop matches the working status request.

[0012] According to the above means, the vehicle domain controller can respond to different working status requests, determine the target speed ratio of the electronic water pump, and then adjust the drive signal according to the target speed ratio so that the working state of the temperature control loop matches the obtained working status request, thereby meeting the thermal management requirements under different working conditions.

[0013] In some embodiments, the target speed ratio of the electronic water pump is determined in response to the working status request, including: when the working status request is a power-on exhaust request, the target speed ratio is set to the maximum, so that the electronic water pump continues to run at the maximum speed to exhaust the air in the temperature control loop; when the working status request is a circulation request, the target speed ratio is set to the first speed ratio, so that the electronic water pump runs at the first speed; when the working status request is a heat transfer medium filling request, the target speed ratio is set to the maximum, so that the electronic water pump continues to operate at the maximum speed until the filling of the heat transfer medium is completed.

[0014] According to the above technical means, in the control system, the vehicle domain controller can flexibly control the temperature control loop according to different working state requests of the temperature control loop, so that the operating state of the temperature control loop matches the current working state request, thereby improving the temperature control efficiency.

[0015] In some embodiments, the vehicle domain controller is also used to: determine the speed, bus current, phase current and voltage of the electronic water pump based on the drive signal; determine whether the electronic water pump fails based on the speed and / or the bus current and / or the phase current and / or the voltage; in the event of a failure of the electronic water pump, execute a corresponding protection strategy according to the failure type of the electronic water pump; the vehicle domain controller also includes a storage unit for recording fault information of the fault state in the event of a failure of the electronic water pump.

[0016] According to the above technical means, the vehicle domain controller is used to diagnose the fault of the electronic water pump based on the state of the driving signal of the electronic water pump, and the corresponding response strategy is determined for different fault states, which can avoid damage to components caused by various faults; at the same time, a storage unit is set in the vehicle domain controller to record the fault conditions of the system, which can facilitate troubleshooting.

[0017] In some embodiments, the determining whether the electronic water pump has a fault based on the bus current and / or the phase line current and / or the voltage includes: determining that the electronic water pump has an idling fault when the speed of the electronic water pump is greater than the idling speed threshold for a duration greater than a first time threshold and the bus current is less than a first idling current threshold; determining that the electronic water pump has a stalled fault when the speed of the electronic water pump is less than the stalled speed threshold for a duration greater than a second time threshold and the bus current is greater than a stalled current threshold; determining that the electronic water pump has a stalled fault when the phase line current is greater than a first overcurrent threshold and the bus current is greater than a first overcurrent threshold. When the time when the voltage is greater than the second overcurrent threshold is greater than the third time threshold, or when the electronic water pump is short-circuited, it is determined that the electronic water pump has an overcurrent fault; when the time when the voltage is greater than the overvoltage threshold or less than the undervoltage threshold is greater than the fourth time threshold, it is determined that the electronic water pump has an overvoltage fault; according to the fault type of the electronic water pump, a corresponding protection strategy is executed, including: when the fault type is an idling fault, a jammed fault or an overcurrent fault, the electronic water pump is controlled to shut down and restart after a preset time; when the fault type is an overload fault, the electronic water pump is controlled to perform shutdown protection.

[0018] According to the above technical means, the vehicle domain controller executes corresponding protection strategies under different fault conditions based on the results of fault diagnosis, protects and restarts the electronic water pump, and prevents the electronic water pump from being damaged when running in a faulty state.

[0019] In a second aspect, a whole vehicle domain controller is provided, which is applied to a control system of a vehicle, wherein the vehicle includes a temperature control loop, the temperature control loop includes a temperature-controlled component and an electronic water pump, the control system also includes a temperature acquisition unit, which is used to acquire temperature information of a heat-conducting medium in the temperature control loop, and the whole vehicle domain controller includes: a signal input end, which is used to connect to the temperature acquisition unit to receive the temperature information of the heat-conducting medium; a power output end, which is used to connect to the electronic water pump to output a drive signal to the electronic water pump; the whole vehicle domain controller is also used to: determine a target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium; and, according to the target speed ratio, adjust the drive signal so that the speed of the electronic water pump matches the target speed ratio.

[0020] In some embodiments, the vehicle domain controller is also used to: obtain status information of the temperature-controlled component through a CAN bus, the status information including the internal temperature, required target temperature and cooling flow requirement of the temperature-controlled component; determine the target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium, including: querying a preset mapping relationship table according to the temperature information of the heat-conducting medium and the status information of the temperature-controlled component to determine the target speed ratio of the electronic water pump.

[0021] In a third aspect, a vehicle is provided, comprising a temperature control circuit, the temperature control circuit comprising a temperature-controlled component and an electronic water pump, and a control system as described in the first aspect; or, a vehicle domain controller as described in the second aspect.

[0022] In a fourth aspect, a vehicle control method is provided, wherein the vehicle includes a temperature control loop and a control system, the temperature control loop includes a temperature-controlled component and an electronic water pump, the control system includes a temperature acquisition unit and a vehicle domain controller, the signal input end of the vehicle domain controller is connected to the temperature acquisition unit, and the power output end of the vehicle domain controller is connected to the electronic water pump to output a drive signal to the electronic water pump, the control method includes: using the temperature acquisition unit to collect and send temperature information of the heat-conducting medium in the temperature control loop to the vehicle domain controller; using the vehicle domain controller to determine a target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium; and, according to the target speed ratio, adjusting the drive signal so that the speed of the electronic water pump matches the target speed ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of a temperature control loop in the related art;

[0024] Figure 2 It is a schematic diagram of a control system of an electronic water pump in the related art;

[0025] Figure 3 A schematic diagram of another control system of an electronic water pump in the related art;

[0026] Figure 4 A schematic diagram of a control system provided in an embodiment of the present application;

[0027] Figure 5 A schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0028] Figure 6 A schematic flowchart of a vehicle control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application are further elaborated in detail below in conjunction with the drawings and embodiments. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0030] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict. The terms "first / second / third" involved are merely used to distinguish similar objects and do not represent a specific order for the objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing this application and are not intended to limit this application. Before introducing the technical solution of the embodiment of this application, a detailed example is given of the thermal management system and thermal management method of a vehicle and the problems existing therein in the related art.

[0032] With the continuous development of the automobile industry, the demand for temperature control of vehicle components, controllers and passenger compartments is increasing. Taking electric vehicles as an example, they are equipped with various electrical components such as power batteries, power management units, drive motors, motor controllers, etc. In order to ensure their working performance, their temperatures need to be precisely controlled. In addition, the vehicle is also equipped with an air-conditioning system, which relies on refrigerant to exchange heat with the internal environment of the passenger compartment to adjust the temperature of the passenger compartment and improve comfort. Whether the temperature of the above-mentioned components, controllers and passenger compartment can be reasonably controlled plays a decisive role in the safety and comfort of the vehicle.

[0033] Take the power battery as an example. If its temperature is too high, it may cause safety hazards to the vehicle. If the temperature is too low, its charging and discharging performance will decrease, resulting in increased charging time and reduced vehicle endurance. Therefore, in order to ensure the working performance and safety of the power battery, its temperature needs to be precisely controlled.

[0034] The temperature control of power batteries is usually carried out by relying on a temperature control circuit. For example, a heat exchange device is set near the power battery. By controlling the temperature of the heat-conducting medium flowing through the heat exchange device, heat is exchanged with the power battery, thereby adjusting the temperature of the power battery.

[0035] Figure 1 FIG. 1 is a schematic diagram of a temperature control circuit in the related art. Figure 1As shown, the temperature control loop 100 includes an electronic water pump 110, a temperature-controlled component 120, a kettle 130 and a radiator 140 connected in sequence. The above-mentioned components are connected through pipelines, and the heat-conducting medium in the pipeline can flow under the drive of the electronic water pump 110. Taking the temperature reduction of the temperature of the temperature-controlled component as an example, the low-temperature heat-conducting medium exchanges heat with the temperature-controlled component 120 when flowing through the temperature-controlled component 120, the temperature of the temperature-controlled component 120 is reduced, and the temperature of the heat-conducting medium increases; when flowing through the radiator 140, the heat-conducting medium exchanges heat with the external environment through the radiator 140, and the heat of the heat-conducting medium is dissipated to the external environment through the fins on the radiator 140, so that its temperature is reduced again, and enters the input end of the electronic water pump 110 through the pipeline for the next cycle. The kettle 130 can be set at any position of the pipeline of the temperature control loop 100. When the heat-conducting medium in the temperature control loop 100 is reduced, the heat-conducting medium can be added through the filling port of the kettle 130.

[0036] In the above-mentioned temperature control loop 100, its temperature control efficiency is closely related to the precise control of the flow rate of the heat transfer medium in the temperature control loop, that is, the control of the electronic water pump 110 in the temperature control loop 100 plays a decisive role in the temperature control efficiency and accuracy. The electronic water pump in the temperature control loop is mostly connected to the vehicle controller in a manner based on CAN bus technology. CAN bus is a serial communication bus based on a message broadcast mode, which has the characteristics of reliable use and has been widely used in current vehicles.

[0037] Figure 2 Shown is a schematic diagram of a control system of an electronic water pump in the related art. Figure 2 The control system 200 shown in the figure includes a vehicle controller 210, a water pump CAN controller 220 and an electronic water pump 230. The vehicle controller 210 is connected to the water pump CAN controller 220 via a CAN bus, and the water pump CAN controller 220 is also connected to the electronic water pump 230. When the control system is working, the water pump CAN controller 220 can receive a control signal sent by the vehicle controller 210 via the CAN bus, and control the operation of the electronic water pump 230 according to the control signal; at the same time, the water pump CAN controller 220 is also used to feedback the status of the electronic water pump 230 to the vehicle controller 210 via the CAN bus. Figure 2 The control system in the system realizes the control of the electronic water pump through the CAN bus; however, in this way, it is necessary to set up a wiring harness between the water pump CAN controller and the vehicle controller and between the water pump CAN controller and the electronic water pump; at the same time, it is also necessary to reserve space for the water pump CAN controller in the front cabin of the vehicle; secondly, the above-mentioned water pump CAN controller is usually developed for a single model of electronic water pump, and the device reuse rate is low, and it cannot adapt to the needs of different temperature control circuits.

[0038] Figure 3Shown is a schematic diagram of another control system of an electronic water pump in the related art. Figure 3 The control system 300 in the embodiment includes a vehicle controller 310, a thermal management domain controller 320 and an electronic water pump 330. The thermal management domain controller is arranged between the vehicle controller 310 and the electronic water pump 330. Figure 3 The thermal management domain controller 320 in the embodiment includes: a microprocessor circuit, a power supply circuit, a signal acquisition circuit, a communication circuit, a drive and diagnostic circuit. The microprocessor circuit is connected to the CAN communication circuit and the LIN communication circuit to realize communication with other components, including the drive and diagnosis of the water pump. Figure 2 In the manner shown, the thermal management domain controller 320 can directly drive the electronic water pump without having to configure different electronic water pumps. However, from the perspective of the entire vehicle, this approach requires customized design of the configuration of the installed vehicle model and can only be reused on vehicles with similar thermal management system circuit requirements.

[0039] Therefore, how to improve the integration and reusability of the water pump control solution in the thermal management system has become an urgent problem to be solved.

[0040] In view of the above problems, an embodiment of the present application provides a control system, a vehicle domain controller, a vehicle and a control method thereof. The technical solution of the embodiment of the present application will be described in detail below in conjunction with the accompanying drawings.

[0041] Figure 4 is a schematic diagram of a control system provided in an embodiment of the present application, Figure 4 The control system 400 is applied to a vehicle. For ease of description, Figure 4 Also shown is a vehicle 10 and parts thereof associated with a control system 400. The vehicle 10 includes a temperature control loop 11, which may be, for example, Figure 1 The temperature control circuit 100 shown in FIG. 1 includes a temperature-controlled component 12 and an electronic water pump 13 .

[0042] The temperature-controlled component 12 may be any type of component with temperature control requirements in the vehicle 10, and the present embodiment does not specifically limit this. For example, the temperature-controlled component 12 may be a battery in the vehicle, or a motor or a motor driver.

[0043] The electronic water pump 13 is an electronic water pump without a controller, and its main structure is composed of a three-phase motor, an impeller, a pump body and a volute. It can rotate under the drive of an external drive signal. The speed control and fault diagnosis functions of the electronic water pump 13 are realized by a control system.

[0044] Figure 4The control system 400 includes a temperature acquisition unit 410 and a vehicle domain controller 420.

[0045] The temperature acquisition unit 410 is used to collect temperature information of the heat-conducting medium in the temperature control loop. The heat-conducting medium is used to flow in the temperature control loop and perform heat exchange with the temperature-controlled component 12, thereby increasing or decreasing the temperature of the temperature-controlled component 12. The heat-conducting medium can be, for example, water, heat-conducting oil, or refrigerant, etc., which is not specifically limited in the present embodiment of the application.

[0046] As an implementation method, the temperature acquisition unit 410 can be a contact temperature sensor, and its temperature measuring probe can be inserted into the pipeline of the temperature control loop 11 to accurately measure the temperature of the heat-conducting medium in the pipeline. The above-mentioned contact temperature sensor can be a thermocouple temperature sensor or a thermal resistance temperature sensor, and the embodiment of the present application does not limit its specific type.

[0047] As another implementation, the temperature acquisition unit 410 may also be a non-contact temperature sensor. For example, the temperature acquisition unit 410 may be an infrared temperature sensor, which may acquire the temperature of the outer wall of the pipeline outside the temperature control loop 11, and determine the temperature of the heat transfer medium in the pipeline according to the temperature of the outer wall of the pipeline and relevant parameters of the pipeline.

[0048] The vehicle domain controller 420 includes a signal input terminal 421 and a power output terminal 422. The signal input terminal 421 is connected to the temperature acquisition unit 410 to receive the temperature information of the heat-conducting medium. The power output terminal 422 is used to connect to the electronic water pump 13 (also known as a hard-wire connection) to output a driving signal to the electronic water pump 13.

[0049] It should be noted that, according to the previous description, the electronic water pump 13 is a three-phase DC water pump having three input terminals, and correspondingly, the above-mentioned power supply output terminal 422 may include a first phase output terminal, a second phase output terminal, a third phase output terminal and a ground terminal, wherein the first phase output terminal, the second phase output terminal and the third phase output terminal are respectively connected to the three input terminals of the three-phase DC water pump, and the ground terminal is connected to the ground wire of the electronic water pump 13.

[0050] The vehicle domain controller 420 can control the magnitude, frequency and phase of the output current of the first phase output terminal, the second phase output terminal and the third phase output terminal, thereby realizing the speed control of the electronic water pump 13.

[0051] The vehicle domain controller 420 is also used to: determine a target speed ratio of the electronic water pump 13 based on the temperature information of the heat-conducting medium; and adjust the drive signal according to the target speed ratio so that the speed of the electronic water pump 13 matches the target speed ratio.

[0052] It is understandable that the above process of determining the target speed ratio and adjusting the drive according to the target speed ratio can be performed by the thermal management application layer software integrated in the vehicle domain controller 420.

[0053] In the embodiment of the present application, the target speed ratio of the electronic water pump 13 is determined based on the temperature information of the heat-conducting medium. The target speed ratio of the electronic water pump 13 can be adjusted according to the relationship between the real-time temperature of the heat-conducting medium and the preset temperature to increase or decrease the temperature of the heat-conducting medium; or, the target speed ratio of the electronic water pump 13 can be adjusted according to the change of the real-time temperature of the heat-conducting medium to keep the temperature of the heat-conducting medium constant.

[0054] In the embodiment of the present application, the target speed ratio of the electronic water pump 13 is determined based on the temperature information of the heat-conducting medium. The electronic water pump 13 can be adjusted based on only the single-dimensional information of the temperature information of the heat-conducting medium. Alternatively, the temperature information of the heat-conducting medium and information of the control system or vehicle and other dimensions can be considered simultaneously to more accurately control the electronic water pump 13.

[0055] In the embodiment of the present application, the target speed ratio of the electronic water pump 13 can be understood as the proportional relationship between the required speed and the maximum speed of the electronic water pump 13. For example, when the target speed ratio is 0%, it means that the required speed is 0, and the electronic water pump 13 stops rotating at this time; when the target speed ratio is 100%, it means that the current required speed is the maximum speed of the electronic water pump 13. When the target speed ratio is greater than 100%, it means that the current required speed is greater than the maximum speed of the electronic water pump 13. In order to avoid the influence of the overload of the electronic water pump 13 on its operating safety and performance, in this case, the target speed ratio is 100%, that is, the electronic water pump 13 runs at the maximum speed.

[0056] The following is an example of determining the target speed ratio based on the temperature of the heat-conducting medium. Take the temperature-controlled component 12 as an example, which is the electronic control unit of the vehicle. In the initial stage of vehicle startup, the temperature of the electronic control unit is low, and the temperature of the heat-conducting medium is also relatively low. In this case, there is no need to dissipate heat for the electronic control unit. At this time, the target speed ratio can be set to a low level, and only the heat-conducting medium needs to flow in the temperature control loop; after the vehicle has been running for a period of time, the temperature of the electronic control unit rises, which causes the temperature of the heat-conducting medium in the temperature control loop to rise. At this time, the value of the target speed ratio can be determined based on the relationship between the temperature of the heat-conducting medium and one or more preset temperature thresholds; the higher the temperature of the heat-conducting medium, the larger the corresponding target speed ratio, that is, the higher the temperature, the greater the heat dissipation demand, and the higher the speed of the electronic water pump 13 required.

[0057] In the embodiment of the present application, the above-mentioned adjustment of the driving signal according to the target speed ratio can be: according to the value of the target speed ratio, the current magnitude / phase / duty cycle parameters of the driving signal are adjusted to match the speed of the electronic water pump with the target speed ratio. For example, when the target speed ratio is 0%, the current magnitude is set to 0; when the target speed ratio changes, the current magnitude is adjusted, the larger the target speed ratio, the larger the corresponding current, and the smaller the target speed ratio, the smaller the corresponding current.

[0058] According to the above technical means, by integrating the input interface of the temperature acquisition unit and the control interface of the direct-drive electronic water pump on the vehicle domain controller of the control system, the vehicle domain controller directly controls the output of the water pump, further improving the integration of the vehicle thermal management system and realizing direct-drive control of the water pump. The direct-drive water pump control of the vehicle domain controller optimizes the loop control of thermal management from the system level, and moves the control capability of components to a controller with higher integration, thereby opening up the state and interface capabilities to more functional domains, and the integrated thermal management system can adapt to the needs of more thermal management systems.

[0059] In some embodiments, the vehicle domain controller 420 is also used to obtain status information of the temperature-controlled component 12 through the CAN bus. The status information may include the internal temperature of the temperature-controlled component 12, the required target temperature, and the cooling flow requirement.

[0060] Taking the temperature-controlled component 12 as an example, which is a power battery of a vehicle, the status information of the temperature-controlled component 12 may be the internal temperature of the battery and the required target temperature of the battery. The internal temperature of the battery is the current temperature of the power battery, and the required target temperature may be a target temperature determined according to the working state of the battery. When the internal temperature of the battery is the same as the target temperature, the power battery can have better charging and discharging performance and higher safety. The required target temperature may be greater than or less than the current temperature. For example, in the early stage of battery charging, in order to improve the charging efficiency, the battery needs to be heated. At this time, the required target temperature will be greater than the internal temperature of the battery. At this time, the temperature control circuit needs to increase the temperature of the battery. During the continuous discharge of the battery, its internal temperature rises. In order to avoid thermal runaway, the temperature control circuit needs to be used to reduce the temperature inside the battery. At this time, the required target temperature is less than the internal temperature.

[0061] It can also be understood that the collection of relevant status information of the vehicle power battery and the management of the battery status are usually performed by the power management system (battery management system, BMS). The BMS is usually connected to the vehicle domain controller 420 through the CAN bus. Therefore, in the embodiment of the present application, the vehicle domain controller 420 can obtain the battery status information from the BMS through the CAN bus.

[0062] The vehicle domain controller may obtain the status information of the temperature-controlled component 12 by actively obtaining the above status information through a communication method such as a CAN bus, or the temperature-controlled component 12 or other components associated with the temperature-controlled component 12 may report the above status information to the vehicle domain controller 420 through a communication method such as a CAN bus.

[0063] It should be noted that the temperature-controlled component 12 is a power battery for example only, and the temperature-controlled component 12 can be any component in the vehicle that has a temperature control requirement. The vehicle domain controller 420 can obtain the status information of the temperature-controlled component 12 from the controllers of each subsystem in the vehicle through the CAN bus; or, the vehicle domain controller 420 can also receive the parameters input by the user through the communication connection with the central control unit of the vehicle, and use them as the status information of the temperature-controlled component 12.

[0064] The above-mentioned determination of the target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium includes: querying a preset mapping relationship table according to the temperature information of the heat-conducting medium and the state information of the temperature-controlled component 12 to determine the target speed ratio of the electronic water pump 13 .

[0065] The above-mentioned preset mapping relationship table can be a mapping table established by pre-calibration based on the relationship between parameters such as the temperature of the heat-conducting medium, the temperature of the temperature-controlled component 12, the required target temperature, and the cooling flow requirement, and the speed or speed ratio of the electronic water pump 13. In actual applications, the target speed ratio matching the above information can be determined by looking up the table.

[0066] In an embodiment of the present application, the above-mentioned process of querying the mapping relationship table is usually performed by a thermal management software system deployed in the vehicle domain controller 420, which determines the target speed ratio by calling the mapping table based on the obtained multiple parameters, outputs it to the bottom layer, and then the bottom layer drives the electronic water pump 13 through a hard line.

[0067] According to the above means, the vehicle domain controller obtains the status information of the temperature-controlled component through the CAN bus, and judges the status of the temperature control loop based on the status information and the temperature information of the heat-conducting medium in the temperature control loop using the thermal management software integrated in the vehicle domain controller, determines the target speed ratio of the electronic water pump, and drives the electronic water pump according to the set logic, so that the status of the temperature control loop matches the needs of the temperature-controlled component.

[0068] In some embodiments, the vehicle domain controller 420 is also used to: obtain a working status request for the temperature control loop; determine a target speed ratio of the electronic water pump 13 in response to the working status request; and adjust the drive signal according to the target speed ratio so that the working status of the temperature control loop matches the working status request.

[0069] The working state request of the temperature control loop may include, for example, a power-on exhaust request, a circulation request, and a heat transfer medium filling request.

[0070] There are many ways for the vehicle domain controller 420 to obtain the above working status request. As a possible implementation method, the vehicle domain controller 420 can determine the working status request of the current temperature control loop based on various status information of the vehicle, working parameters of each component in the temperature control loop, and working parameters of the temperature-controlled component 12; as another possible implementation method, the user can input the working status request of the temperature control loop through human-computer interaction with the central control unit, and the vehicle domain controller 420 obtains the working status request through the communication connection between the central control unit.

[0071] According to the above technical solution provided in the embodiment of the present application, the vehicle domain controller can respond to different working status requests, determine the target speed ratio of the electronic water pump, and then adjust the drive signal according to the target speed ratio, so that the working state of the temperature control loop matches the obtained working status request, thereby meeting the thermal management requirements under different working conditions.

[0072] In some embodiments, in response to the working state request, determining the target speed ratio of the electronic water pump includes:

[0073] When the working state request is a power-on exhaust request, the target speed ratio is set to the maximum, so that the electronic water pump 13 can continue to work at the maximum speed to exhaust the air in the heat transfer medium in the temperature control loop.

[0074] It is understandable that the power-on exhaust request usually occurs in the initial startup stage of the vehicle. The vehicle domain controller 420 is also used to: after controlling the electronic water pump 13 to run at the maximum speed to exhaust the air, redetermine the current target speed ratio according to the temperature of the heat transfer medium and / or other working status requests of the temperature control circuit and / or the status information of the temperature-controlled component 12.

[0075] When the working state request is a circulation request, the target speed ratio is set to the first speed ratio so that the electronic water pump 13 runs at the first speed. The first speed ratio can be set to a smaller value, such as 10% or 20%, and the specific value is not limited in the embodiment of the present application. The electronic water pump 13 runs at the first speed according to the first speed ratio to ensure that the heat transfer medium in the temperature control loop remains in a circulating flow state.

[0076] When the working status request is a request for filling a heat-conducting medium, the target speed ratio is set to the maximum, so that the electronic water pump 13 can continue to run at the maximum speed, and the heat-conducting medium is added through the kettle in the temperature control loop. The heat-conducting medium can flow in the pipeline of the temperature control loop under the drive of the electronic water pump 13 until the filling amount of the heat-conducting medium reaches a preset value.

[0077] According to the above technical means, in the control system, the vehicle domain controller can flexibly control the temperature control loop according to different working state requests of the temperature control loop, so that the operating state of the temperature control loop matches the current working state request, thereby improving the temperature control efficiency.

[0078] In some embodiments, the vehicle domain controller 420 is also used to: determine the speed, bus current, phase current and voltage of the electronic water pump 13 based on the drive signal; determine whether the electronic water pump 13 fails based on the speed and / or bus current and / or phase current and / or voltage; in the event of a failure of the electronic water pump 13, execute a corresponding protection strategy according to the failure type of the electronic water pump 13; the vehicle domain controller 420 also includes a storage unit for recording fault information of the fault state in the event of a failure of the electronic water pump 13.

[0079] The fault types of the electronic water pump 13 may include idling, stalling, overcurrent, and overvoltage. When different types of faults occur in the electronic water pump 13, its speed, voltage, current and other parameters will change differently. The vehicle domain controller 420 can determine the fault state of the electronic water pump 13 according to the changes in the above parameters, and execute corresponding protection strategies for different fault types.

[0080] At the same time, in the technical solution of the embodiment of the present application, a storage unit is also provided in the vehicle domain controller 420. When the vehicle domain controller 420 determines that the current electronic water pump 13 fails, the current fault information can be saved in the storage unit to facilitate troubleshooting.

[0081] The embodiments of the present application do not limit the specific type of the above-mentioned storage unit. For example, the storage unit can be a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a magnetic random access memory (FRAM), a flash memory, and other types of memory.

[0082] According to the above technical means, the vehicle domain controller is used to diagnose the fault of the electronic water pump based on the state of the driving signal of the electronic water pump, and the corresponding response strategy is determined for different fault states, which can avoid damage to components caused by various faults; at the same time, a storage unit is set in the vehicle domain controller to record the fault conditions of the system, which can facilitate troubleshooting.

[0083] In some embodiments, the above-mentioned determining whether the electronic water pump fails based on the bus circuit and / or phase line current and / or voltage includes:

[0084] When the rotation speed of the electronic water pump 13 is greater than the idling rotation speed threshold for a duration greater than the first time threshold, and the bus current is less than the first idling current threshold, it is determined that the electronic water pump 13 has an idling fault. In this case, when the electronic water pump 13 continues to run at a higher speed for a period of time and the bus current is small, its load is small and it may be in an idling state. If it continues to run in this state, it may cause wear of the rotating parts.

[0085] When the speed of the electronic water pump 13 is less than the stall speed threshold for a time greater than the second time threshold, and the bus current is greater than the stall current threshold, it is determined that the electronic water pump 13 has a stall fault; when the electronic water pump 13 continues to run at a lower speed and the bus current is large, the electronic water pump 13 may be in a stall state. If it is started in a stall state, it will cause damage to the rotating parts and the stator.

[0086] When the time during which the phase line current is greater than the first overcurrent threshold and the bus current is greater than the second overcurrent threshold is greater than the third time threshold, or when the electronic water pump 13 is short-circuited, it is determined that an overcurrent fault occurs in the electronic water pump 13 .

[0087] When the time during which the voltage is greater than the overvoltage threshold or less than the undervoltage threshold is greater than the fourth time threshold, it is determined that an overvoltage fault occurs in the electronic water pump 13 .

[0088] The vehicle domain controller 420 executes corresponding protection strategies according to the fault type of the electronic water pump 13, including: when the fault type is an idling fault, a jammed fault or an overcurrent fault, controlling the electronic water pump 13 to shut down and restart after a preset time; when the fault type is an overload fault, controlling the electronic water pump 13 to execute shutdown protection.

[0089] According to the above technical means, the vehicle domain controller executes corresponding protection strategies under different fault conditions based on the results of fault diagnosis, protects and restarts the electronic water pump, and prevents the electronic water pump from being damaged when running in a faulty state.

[0090] The embodiment of the present application also provides a vehicle domain controller, the vehicle control system of the vehicle domain controller, the control system can be, for example Figure 4 In the control system 400, the vehicle may be Figure 4 The vehicle 10 shown in FIG. 1 includes a temperature control loop, which may be, for example, Figure 1The temperature control loop 100 shown in FIG. 1 includes a temperature-controlled component and an electronic water pump. The control system 400 also includes a temperature acquisition unit for acquiring temperature information of the heat-conducting medium in the temperature control loop. The vehicle domain controller may be, for example, Figure 4 The vehicle domain controller 420 in the vehicle.

[0091] The vehicle domain controller in the embodiment of the present application includes: a signal input end, which is used to connect to the temperature acquisition unit to receive temperature information of the heat-conducting medium; and a power output end, which is used to connect to the electronic water pump to output a driving signal to the electronic water pump.

[0092] The vehicle domain controller is also used to: determine a target speed ratio of the electronic water pump based on temperature information of the heat transfer medium; and adjust the drive signal according to the target speed ratio so that the speed of the electronic water pump matches the target speed ratio.

[0093] In some embodiments, the vehicle domain controller is also used to: obtain status information of the temperature-controlled component through the CAN bus, the status information including the internal temperature of the temperature-controlled component, the required target temperature and the cooling flow requirement; determine the target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium, including: querying a preset mapping relationship table according to the temperature information of the heat-conducting medium and the status information of the temperature-controlled component, and determining the target speed ratio of the electronic water pump.

[0094] In some embodiments, the vehicle domain controller is also used to: obtain a working status request for the temperature control loop; determine a target speed ratio of the electronic water pump in response to the working status request; and adjust the drive signal according to the target speed ratio so that the working status of the temperature control loop matches the working status request.

[0095] In some embodiments, in response to a working status request, a target speed ratio of the electronic water pump is determined, including: when the working status request is a power-on exhaust request, the target speed ratio is set to a maximum so that the electronic water pump continues to run at the maximum speed to exhaust the air in the temperature control loop; when the working status request is a circulation request, the target speed ratio is set to a first speed ratio so that the electronic water pump runs at a first speed; when the working status request is a heat transfer medium filling request, the target speed ratio is set to a maximum so that the electronic water pump continues to run at the maximum speed until the filling of the heat transfer medium is completed.

[0096] In some embodiments, the vehicle domain controller is also used to: determine the speed, bus current, phase current and voltage of the electronic water pump based on the drive signal; determine whether the electronic water pump fails based on the speed and / or bus current and / or phase current and / or voltage; in the event of a failure of the electronic water pump, execute a corresponding protection strategy according to the failure type of the electronic water pump; the vehicle domain controller also includes a storage unit for recording fault information of the fault state in the event of a failure of the electronic water pump.

[0097] In some embodiments, determining whether an electronic water pump has a fault is based on bus current and / or phase current and / or voltage, including: determining that an idling fault has occurred in the electronic water pump when the duration of the speed of the electronic water pump being greater than the idling speed threshold is greater than a first time threshold and the bus current is less than a first idling current threshold; determining that a stalled fault has occurred in the electronic water pump when the speed of the electronic water pump is less than the stalled speed threshold for a period of time greater than a second time threshold and the bus current is greater than the stalled current threshold; determining that an overcurrent fault has occurred in the electronic water pump when the phase current is greater than a first overcurrent threshold and the bus current is greater than a second overcurrent threshold for a period of time greater than a third time threshold, or when the electronic water pump is short-circuited; determining that an overvoltage fault has occurred in the electronic water pump when the voltage is greater than an overvoltage threshold or less than an undervoltage threshold for a period of time greater than a fourth time threshold; executing a corresponding protection strategy according to the fault type of the electronic water pump, including: controlling the electronic water pump to shut down and restart after a preset time when the fault type is an idling fault, a stalled fault or an overcurrent fault; and controlling the electronic water pump to perform shutdown protection when the fault type is an overload fault.

[0098] Figure 5 is a schematic structural diagram of a vehicle provided in an embodiment of the present application, Figure 5 The vehicle 500 in the embodiment includes a temperature control circuit, which includes a temperature-controlled component and an electronic water pump. The temperature control circuit may be Figure 1 The temperature control circuit 100 is shown in FIG. Figure 5 The vehicle 500 also includes the control system 400 as described in the above embodiments or the vehicle domain controller 420 as described in the above embodiments.

[0099] Combination of the above Figure 1-Figure 5 , describes in detail the device embodiment of the present application. Figure 6 , the method embodiment of the present application is described in detail, and it should be understood that the description of the method embodiment corresponds to the device embodiment. Therefore, the part not described in detail can refer to the device embodiment above.

[0100] Figure 6 is a schematic flow chart of a vehicle control method provided in an embodiment of the present application. The vehicle to which the method is applied includes a temperature control loop and a control system. The temperature control loop includes a temperature-controlled component and an electronic water pump. The control system includes a temperature acquisition unit and a vehicle domain controller. The signal input end of the vehicle domain controller is connected to the temperature acquisition unit. The power output end of the vehicle domain controller is connected to the electronic water pump for outputting a drive signal to the electronic water pump. The control system may be Figure 4 The control system 400 is shown in FIG. Figure 6 The method includes steps S610-S620.

[0101] In step S610, the temperature information of the heat transfer medium in the temperature control loop is collected by the temperature collection unit and sent to the vehicle domain controller.

[0102] In step S620, the vehicle domain controller is used to determine the target speed ratio of the electronic water pump based on the temperature information of the heat transfer medium; and, according to the target speed ratio, the drive signal is adjusted to match the speed of the electronic water pump with the target speed ratio.

[0103] In some embodiments, the vehicle control method further includes: using the vehicle domain controller to obtain status information of the temperature-controlled component through the CAN bus, the status information including the internal temperature of the temperature-controlled component, the required target temperature, and the cooling flow requirement.

[0104] The above-mentioned determining the target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium includes: querying a preset mapping relationship table according to the temperature information of the heat-conducting medium and the state information of the temperature-controlled component to determine the target speed ratio of the electronic water pump.

[0105] In some embodiments, the vehicle control method also includes: using the vehicle domain controller to obtain a working status request of the temperature control loop; determining a target speed ratio of the electronic water pump in response to the working status request; and adjusting the drive signal according to the target speed ratio so that the working status of the temperature control loop matches the working status request.

[0106] In some embodiments, in response to a working status request, a target speed ratio of the electronic water pump is determined, including: when the working status request is a power-on exhaust request, the target speed ratio is set to a maximum so that the electronic water pump continues to run at the maximum speed to exhaust the air in the temperature control loop; when the working status request is a circulation request, the target speed ratio is set to a first speed ratio so that the electronic water pump runs at a first speed; when the working status request is a heat transfer medium filling request, the target speed ratio is set to a maximum so that the electronic water pump continues to run at the maximum speed until the filling of the heat transfer medium is completed.

[0107] In some embodiments, the vehicle control method also includes: using the vehicle domain controller to determine the speed, bus current, phase current and voltage of the electronic water pump based on the drive signal; determining whether the electronic water pump is faulty based on the speed and / or bus current and / or phase current and / or voltage; in the event of a fault in the electronic water pump, executing a corresponding protection strategy based on the fault type of the electronic water pump.

[0108] The vehicle domain controller also includes a storage unit, and the method further includes: using the storage unit to record fault information of the fault state when the electronic water pump fails.

[0109] In some embodiments, determining whether an electronic water pump has a fault is determined based on the bus current and / or phase line current and / or voltage, including: determining that the electronic water pump has an idling fault when the duration that the speed of the electronic water pump is greater than the idling speed threshold is greater than a first time threshold, and the bus current is less than a first idling current threshold; determining that the electronic water pump has a stalled fault when the speed of the electronic water pump is less than the stalled speed threshold for a time greater than a second time threshold, and the bus current is greater than the stalled current threshold; determining that the electronic water pump has an overcurrent fault when the phase line current is greater than a first overcurrent threshold and the bus current is greater than a second overcurrent threshold for a time greater than a third time threshold, or when the electronic water pump is short-circuited; determining that the electronic water pump has an overvoltage fault when the voltage is greater than an overvoltage threshold or less than an undervoltage threshold for a time greater than a fourth time threshold.

[0110] The above-mentioned protection strategy is executed according to the fault type of the electronic water pump, including: when the fault type is an idling fault, a jammed fault or an overcurrent fault, the electronic water pump is controlled to shut down and restart after a preset time; when the fault type is an overload fault, the electronic water pump is controlled to perform shutdown protection.

[0111] The embodiment of the present application provides a storage medium, which stores one or more computer programs, and the one or more computer programs can be executed by one or more processors to implement some or all of the steps in the above control method. The storage medium can be transient or non-transient.

[0112] An embodiment of the present application provides a computer program, including a computer-readable code. When the computer-readable code is run in a computer device, a processor in the computer device executes some or all of the steps for implementing the above control method.

[0113] The embodiment of the present application provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and when the computer program is read and executed by a computer, some or all of the steps in the above method are implemented. The computer program product can be implemented specifically by hardware, software or a combination thereof. In some embodiments, the computer program product is specifically embodied as a computer storage medium, and in other embodiments, the computer program product is specifically embodied as a software product, such as a software development kit (SDK) and the like.

[0114] It should be noted here that the description of the various embodiments above tends to emphasize the differences between the various embodiments, and the same or similar aspects can be referenced to each other. The description of the above device, storage medium, computer program and computer program product embodiments is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the embodiments of the device, storage medium, computer program and computer program product of this application, please refer to the description of the method embodiment of this application for understanding.

[0115] It should be noted here that the description of the above storage medium and device embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details not disclosed in the storage medium and device embodiments of this application, please refer to the description of the method embodiments of this application for understanding.

[0116] The above-mentioned computer storage medium / memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory (Flash Memory), a magnetic surface memory, an optical disk, or a compact disc read-only memory (CD-ROM) and the like; it can also be various terminals including one or any combination of the above-mentioned memories, such as mobile phones, computers, tablet devices, personal digital assistants, etc.

[0117] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the serial number of each step / process mentioned above does not mean the order of execution, and the execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. The serial numbers of the embodiments of the present application mentioned above are for description only and do not represent the advantages and disadvantages of the embodiments.

[0118] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0119] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0120] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0121] In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0122] A person skilled in the art can understand that all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM), magnetic disks or optical disks, etc., various media that can store program codes.

[0123] Alternatively, if the above-mentioned integrated unit of the present application is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can essentially or in other words, the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a vehicle-mounted terminal (which can be a personal computer, server, or network device, etc.) to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0124] The above is only an implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A control system, applied to a vehicle, the vehicle comprising a temperature control circuit, the temperature control circuit comprising a temperature-controlled component and an electronic water pump, characterized in that: The control system comprises: A temperature collection unit, used to collect temperature information of the heat-conducting medium in the temperature control loop; A vehicle domain controller, comprising a signal input terminal and a power output terminal, wherein the signal input terminal is connected to the temperature acquisition unit to receive the temperature information of the heat-conducting medium, and the power output terminal is used to connect to the electronic water pump to output a driving signal to the electronic water pump; The vehicle domain controller is used for: determining a target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium; and According to the target speed ratio, the drive signal is adjusted so that the speed of the electronic water pump matches the target speed ratio.

2. The control system according to claim 1, characterized in that: The vehicle domain controller is also used to: obtain the status information of the temperature-controlled component through the CAN bus, wherein the status information includes the internal temperature, the required target temperature and the cooling flow requirement of the temperature-controlled component; Determining the target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium includes: querying a preset mapping relationship table according to the temperature information of the heat-conducting medium and the state information of the temperature-controlled component to determine the target speed ratio of the electronic water pump.

3. The control system according to claim 1 or 2, characterized in that: The vehicle domain controller is also used for: Obtaining a working status request of the temperature control loop; In response to the working state request, determining a target speed ratio of the electronic water pump; According to the target speed ratio, the drive signal is adjusted so that the working state of the temperature control loop matches the working state request.

4. The control system according to claim 3, characterized in that: The step of determining a target speed ratio of the electronic water pump in response to the working state request includes: When the working state request is a power-on exhaust request, setting the target speed ratio to a maximum, so that the electronic water pump continuously runs at a maximum speed to exhaust air in the temperature control loop; When the working state request is a cycle request, setting the target speed ratio to a first speed ratio so that the electronic water pump operates at a first speed; When the working state request is a request for filling the heat transfer medium, the target speed ratio is set to a maximum, so that the electronic water pump continues to operate at the maximum speed until the filling of the heat transfer medium is completed.

5. The control system according to claim 1 or 2, characterized in that: The vehicle domain controller is also used for: Determine the speed, bus current, phase current and voltage of the electronic water pump based on the drive signal; Determining whether the electronic water pump fails based on the rotation speed and / or the bus current and / or the phase current and / or the voltage; In the event of a failure of the electronic water pump, executing a corresponding protection strategy according to the failure type of the electronic water pump; The vehicle domain controller also includes a storage unit for recording fault information of the fault state when a fault occurs in the electronic water pump.

6. The control system according to claim 5, characterized in that: The determining whether the electronic water pump fails based on the bus current and / or the phase line current and / or the voltage includes: When the duration that the speed of the electronic water pump is greater than the idling speed threshold is greater than the first time threshold, and the bus current is less than the first idling current threshold, it is determined that the electronic water pump has an idling fault; When the speed of the electronic water pump is less than the stall speed threshold for a period greater than a second time threshold, and the bus current is greater than the stall current threshold, it is determined that a stall fault occurs in the electronic water pump; When the time during which the phase line current is greater than the first overcurrent threshold and the bus current is greater than the second overcurrent threshold is greater than a third time threshold, or when the electronic water pump is short-circuited, it is determined that an overcurrent fault occurs in the electronic water pump; When the time during which the voltage is greater than the overvoltage threshold or less than the undervoltage threshold is greater than a fourth time threshold, determining that an overvoltage fault occurs in the electronic water pump; The executing a corresponding protection strategy according to the fault type of the electronic water pump includes: When the fault type is an idling fault, a stall fault or an overcurrent fault, the electronic water pump is controlled to stop and restart after a preset time; When the fault type is an overload fault, the electronic water pump is controlled to perform shutdown protection.

7. A vehicle domain controller, applied to a vehicle control system, the vehicle comprising a temperature control loop, the temperature control loop comprising a temperature-controlled component and an electronic water pump, the control system further comprising a temperature acquisition unit for acquiring temperature information of a heat-conducting medium in the temperature control loop, characterized in that: The vehicle domain controller includes: A signal input terminal, used to connect to the temperature acquisition unit to receive temperature information of the heat-conducting medium; A power output terminal, used to be connected to the electronic water pump to output a driving signal to the electronic water pump; The vehicle domain controller is also used to: determine a target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium; and, according to the target speed ratio, adjust the drive signal so that the speed of the electronic water pump matches the target speed ratio.

8. The vehicle domain controller according to claim 7, characterized in that: The vehicle domain controller is also used to: obtain the status information of the temperature-controlled component through the CAN bus, wherein the status information includes the internal temperature, the required target temperature and the cooling flow requirement of the temperature-controlled component; Determining the target speed ratio of the electronic water pump based on the temperature information of the heat-conducting medium includes: querying a preset mapping relationship table according to the temperature information of the heat-conducting medium and the state information of the temperature-controlled component to determine the target speed ratio of the electronic water pump.

9. A vehicle, characterized in that: The vehicle comprises a temperature control circuit, the temperature control circuit comprises a temperature-controlled component and an electronic water pump; and, A control system as claimed in any one of claims 1 to 6; or The vehicle domain controller as described in claim 7 or 8.

10. A method for controlling a vehicle, the vehicle comprising a temperature control loop and a control system, the temperature control loop comprising a temperature-controlled component and an electronic water pump, the control system comprising a temperature acquisition unit and a vehicle domain controller, the signal input end of the vehicle domain controller being connected to the temperature acquisition unit, the power output end of the vehicle domain controller being connected to the electronic water pump to output a drive signal to the electronic water pump, characterized in that: The control method comprises: Using the temperature acquisition unit to collect and send the temperature information of the heat-conducting medium in the temperature control loop to the vehicle domain controller; The vehicle domain controller is used to determine a target speed ratio of the electronic water pump based on the temperature information of the heat transfer medium; and, according to the target speed ratio, the drive signal is adjusted so that the speed of the electronic water pump matches the target speed ratio.

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