Vehicle thermal management method, electronic water pump and vehicle

Abstract

The invention discloses a vehicle thermal management method, an electronic water pump and a vehicle, and relates to the technical field of vehicles. The method is used for an electronic water pump of a vehicle and comprises the steps that vehicle information is obtained, and the vehicle information comprises at least one of the current battery temperature of a power battery, the state of the electronic water pump, the environment temperature of the environment where the vehicle is located, the vehicle state and equipment to be subjected to heat management; the duty ratio of a PWM signal is determined according to the vehicle information, and the PWM signal is a signal that an electronic water pump of the vehicle controls rotation of an impeller of the PWM signal; and working according to the PWM signal so as to realize thermal management of the vehicle.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a vehicle thermal management method, an electronic water pump, and a vehicle. Background Art

[0002] Electronic water pumps are widely used in the automotive field, especially in BEV (Battery Electric Vehicle) models. However, electronic water pumps in related technologies are usually independently controlled and have high energy consumption. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, a first object of the present invention is to provide a vehicle thermal management method to reduce energy consumption.

[0004] A second objective of the present invention is to provide an electronic water pump.

[0005] A third object of the present invention is to provide a vehicle.

[0006] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a vehicle thermal management method, which is used for a vehicle's electronic water pump. The method includes: obtaining vehicle information, wherein the vehicle information includes the current battery temperature of the power battery, the status of the electronic water pump, the ambient temperature of the vehicle's environment, the vehicle status, and at least one of the thermal management equipment; determining the duty cycle of a PWM signal based on the vehicle information, wherein the PWM signal is a signal for the vehicle's electronic water pump to control the rotation of its own impeller; and operating according to the PWM signal to achieve thermal management of the vehicle.

[0007] In addition, the vehicle thermal management method according to the embodiment of the present invention may also have the following additional technical features:

[0008] According to one embodiment of the present invention, when the vehicle information includes the current battery temperature and the device to be thermally managed, determining the duty cycle of the PWM (Pulse Width Modulation) signal based on the vehicle information includes: when the device to be thermally managed is the power battery, obtaining the temperature difference between the current battery temperature and the target battery temperature; when the temperature difference is greater than a first preset threshold, determining the duty cycle to be a first preset duty cycle, wherein the value range of the first preset duty cycle is 89% to 100%; when the temperature difference is less than or equal to the first preset threshold and greater than a second preset threshold, obtaining the duty cycle of the PWM signal according to the temperature difference; when the temperature difference is less than or equal to the second preset threshold, determining the duty cycle to be a second preset duty cycle, wherein the value range of the second preset duty cycle is 50% to 69%.

[0009] According to one embodiment of the present invention, when the temperature difference is less than or equal to the first preset threshold and greater than the second preset threshold, the duty cycle of the PWM signal is obtained according to the following formula:

[0010] PWM1=70%+6%×(ΔT-2),

[0011] Wherein, PWM1 is the duty cycle of the PWM signal, and ΔT is the temperature difference.

[0012] According to one embodiment of the present invention, when the vehicle information includes the device to be thermally managed, determining the duty cycle of the PWM signal based on the vehicle information includes: when the device to be thermally managed is a drive motor of the vehicle, determining the duty cycle of the PWM signal to be a third preset duty cycle.

[0013] According to one embodiment of the present invention, when the vehicle information includes the status of an electronic water pump, determining the duty cycle of the PWM signal based on the vehicle information includes: when the electronic water pump status is a zero-flow standby state, determining that the duty cycle of the PWM signal is a fourth preset duty cycle, wherein when the duty cycle of the PWM signal is the fourth preset duty cycle, the power of the electronic water pump when operating according to the PWM signal is less than or equal to 3W.

[0014] According to one embodiment of the present invention, when the vehicle information includes the ambient temperature, the vehicle status and the device to be thermally managed, determining the duty cycle of the PWM signal based on the vehicle information includes: when the ambient temperature is lower than a preset temperature, the vehicle status is in a startup state and the device to be thermally managed is the power battery, determining the duty cycle of the PWM signal to be a fifth preset duty cycle, wherein the value range of the fifth preset duty cycle is 10% to 30%.

[0015] A second aspect of the present invention provides an electronic water pump, comprising a memory, a processor, and a computer program stored in the memory and running on the processor. When the computer program is executed by the processor, the above-mentioned vehicle thermal management method is implemented.

[0016] In addition, the electronic water pump according to the embodiment of the present invention may also have the following additional technical features:

[0017] According to one embodiment of the present invention, the electronic water pump includes a water pump motor, and a micro heat pipe is embedded in the stator winding of the water pump motor.

[0018] According to one embodiment of the present invention, the electronic water pump also includes an impeller, an outer rotor permanent magnet assembly and an inner rotor magnetic conductive assembly. The water pump motor is mechanically connected to the outer rotor permanent magnet assembly, and the impeller is mechanically connected to the inner rotor magnetic conductive assembly. A non-magnetic isolation cover is provided between the outer rotor permanent magnet assembly and the inner rotor magnetic conductive assembly, and the thickness of the non-magnetic isolation cover is less than or equal to 0.5 mm.

[0019] A third embodiment of the present invention provides a vehicle comprising the above-mentioned electronic water pump.

[0020] According to an embodiment of the present invention, a vehicle thermal management method, an electronic water pump, and a vehicle are provided. The method is used for a vehicle electronic water pump and includes: obtaining vehicle information, wherein the vehicle information includes at least one of the current battery temperature of the power battery, the status of the electronic water pump, the ambient temperature of the vehicle's environment, the vehicle status, and a device to be thermally managed; determining a duty cycle of a PWM signal based on the vehicle information, wherein the PWM signal is a signal used by the vehicle's electronic water pump to control the rotation of its own impeller; and operating according to the PWM signal to achieve thermal management of the vehicle. Thus, by setting up the electronic water pump, vehicle information can be obtained, and the duty cycle of the PWM signal used to control the rotation of the electronic water pump impeller can be determined based on the vehicle information, thereby achieving real-time adjustment of the electronic water pump's power based on the vehicle information. When higher power is not required, the power of the electronic water pump can be reduced, thereby reducing the energy consumption of the electronic water pump.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flow chart of a vehicle thermal management method according to an embodiment of the present invention;

[0023] Figure 2 1 is a schematic structural diagram of an electronic water pump according to an example of the present invention;

[0024] Figure 3is a structural block diagram of an electronic water pump according to an embodiment of the present invention;

[0025] Figure 4 4 is a block diagram of a vehicle thermal structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following describes a vehicle thermal management method, an electronic water pump, and a vehicle according to embodiments of the present invention with reference to the accompanying drawings. Throughout, identical or similar reference numerals represent identical or similar elements or elements having identical or similar functions. The embodiments described with reference to the accompanying drawings are illustrative only and are not to be construed as limiting the present invention.

[0027] Figure 1 4 is a flow chart of a vehicle thermal management method according to an embodiment of the present invention.

[0028] In an embodiment of the present invention, a vehicle thermal management method is used for an electronic water pump of a vehicle.

[0029] like Figure 1 As shown, a vehicle thermal management method includes:

[0030] S11, obtaining vehicle information, wherein the vehicle information includes at least one of a current battery temperature of a power battery, a status of an electronic water pump, an ambient temperature of an environment in which the vehicle is located, a vehicle status, and a device to be thermally managed.

[0031] Specifically, to reduce the energy consumption of the electronic water pump, an interface is set up on the electronic water pump to deeply link the electronic water pump with the vehicle's thermal management system. This allows the electronic water pump to communicate with the vehicle's thermal management system through the interface, obtain information sent by the vehicle's thermal management system, and obtain information sent by the vehicle's BTMS (Battery Thermal Management System) and MCU (Microcontroller Unit). In other words, the vehicle's thermal management system can be set to directly and cross-system obtain the above vehicle information and send the above vehicle information to the electronic water pump.

[0032] Among them, the above-mentioned electronic water pump can be found in Figure 2 In the specific example shown, 1 is the BTMS / MCU signal interface, 2 is the pump body of the electronic water pump, and 3 is the water pump motor of the electronic water pump. The electronic water pump can obtain the above vehicle information based on the information received by the BTMS / MCU signal interface 1.

[0033] S12, determining a duty cycle of a PWM signal according to vehicle information, wherein the PWM signal is a signal for the vehicle's electronic water pump to control the rotation of its own impeller.

[0034] Specifically, when the electronic water pump is working, it needs to send a PWM signal to control the rotation of the impeller to pump out the coolant. That is to say, the electronic water pump can adjust its own impeller speed by adjusting the duty cycle of the PWM signal, thereby adjusting its own operating power.

[0035] Therefore, after obtaining the above-mentioned vehicle information, the electronic water pump can know which device of the vehicle it needs to provide coolant for and the current status of the vehicle based on the vehicle information, and then can determine what power it needs to operate at based on this, and determine the duty cycle of the PWM signal based on the required power.

[0036] S13, operating according to the PWM signal to achieve thermal management of the vehicle.

[0037] Specifically, after determining the duty cycle of the PWM signal, the electronic water pump can generate a PWM signal based on the duty cycle, and drive the impeller to rotate according to the PWM signal, thereby pumping out the coolant to achieve thermal management of the vehicle.

[0038] Therefore, by setting up an electronic water pump, vehicle information can be obtained, and the duty cycle of the PWM signal that controls the rotation of the electronic water pump impeller can be determined according to the vehicle information, thereby realizing real-time adjustment of the power of the electronic water pump based on the vehicle information. When higher power is not required, the power of the electronic water pump can be reduced, thereby reducing the energy consumption of the electronic water pump.

[0039] In some embodiments of the present invention, when the vehicle information includes the current battery temperature and the device to be thermally managed, the duty cycle of the PWM signal is determined according to the vehicle information, including: when the device to be thermally managed is a power battery, obtaining the temperature difference between the current battery temperature and the target battery temperature; when the temperature difference is greater than a first preset threshold, determining the duty cycle to be the first preset duty cycle, wherein the value range of the first preset duty cycle is 89% to 100%; when the temperature difference is less than or equal to the first preset threshold and greater than the second preset threshold, obtaining the duty cycle of the PWM signal according to the temperature difference; when the temperature difference is less than or equal to the second preset threshold, determining the duty cycle to be the second preset duty cycle, wherein the value range of the second preset duty cycle is 50% to 69%.

[0040] Specifically, when the electronic water pump determines that the current device to be thermally managed is the vehicle's power battery based on the received vehicle information, the electronic water pump needs to determine the next required operating power based on the current battery temperature and the target battery temperature.

[0041] When the temperature difference between the current battery temperature and the target battery temperature is greater than the first preset threshold, it is determined that the current battery temperature is much higher than the target battery temperature. At this time, the electronic water pump needs to operate at a higher power, and therefore, the duty cycle of the PWM signal is determined to be the first preset duty cycle.

[0042] When the temperature difference is less than or equal to the first preset threshold and greater than the second preset threshold, it means that the gap between the battery temperature of the power battery and the target battery temperature is small. At this time, the battery performance is more sensitive to temperature. Therefore, it is set to determine the electronic water pump power according to the temperature difference in real time to ensure that the power battery can operate in the best state.

[0043] When the temperature difference is less than or equal to the second preset threshold, it means that the battery temperature of the power battery is very close to the target battery temperature, and the electronic water pump does not need to operate at a higher power. Therefore, the duty cycle of the PWM signal is determined to be the second preset duty cycle, so that the electronic water pump operates at a lower power and reduces energy consumption.

[0044] Among them, the value range of the above-mentioned first preset duty cycle is 89% to 100%, the value range of the above-mentioned second preset duty cycle is 50% to 69%, the value range of the above-mentioned first preset threshold is 4.5℃ to 5℃, and the value range of the above-mentioned second preset threshold is 2℃ to 2.5℃.

[0045] In some embodiments of the present invention, when the temperature difference is less than or equal to the first preset threshold and greater than the second preset threshold, the duty cycle of the PWM signal is obtained according to the following formula:

[0046] PWM1=70%+6%×(ΔT-2),

[0047] Wherein, PWM1 is the duty cycle of the PWM signal, and ΔT is the temperature difference.

[0048] The following describes the process in conjunction with a specific embodiment.

[0049] In this specific embodiment, the first preset duty cycle is 100%, the second preset duty cycle is 50%, the first preset threshold is 5°C, and the second preset threshold is 2°C.

[0050] At this time, first, the target battery temperature is subtracted from the current battery temperature to obtain a temperature difference ΔT.

[0051] If the temperature difference ΔT is greater than 5°C, the duty cycle PWM1 of the PWM signal is 100%. If the temperature difference ΔT is greater than 2°C and less than or equal to 5°C, the duty cycle PWM1 of the PWM signal is 70% + 6% × (ΔT - 2). If the temperature difference ΔT is less than or equal to 2°C, the duty cycle PWM1 of the PWM signal is 50%.

[0052] In some embodiments of the present invention, when the vehicle information includes a device to be thermally managed, the duty cycle of the PWM signal is determined based on the vehicle information, including: when the device to be thermally managed is a drive motor of the vehicle, determining the duty cycle of the PWM signal to be a third preset duty cycle.

[0053] To ensure the electronic water pump can pump coolant to the heat-managed equipment, a three-way valve can be installed. This valve can be installed on the electronic water pump or on the cooling channel. In other words, the cooling channel and the battery liquid cooling plate share coolant, and the three-way valve is used to switch the heat source.

[0054] Taking the above-mentioned three-way valve set on the electronic water pump as an example, when the device to be thermally managed is a power battery, the electronic water pump controls the three-way valve on it so that the passage in the three-way valve from the water outlet of the electronic water pump to the battery liquid cooling plate of the power battery is connected; when the device to be thermally managed is a drive motor, the electronic water pump controls the three-way valve on it so that the passage in the three-way valve from the water outlet of the electronic water pump to the cooling device of the drive motor is connected.

[0055] In some embodiments of the present invention, when the vehicle information includes the status of the electronic water pump, the duty cycle of the PWM signal is determined according to the vehicle information, including: when the electronic water pump status is a zero-flow standby state, determining that the duty cycle of the PWM signal is a fourth preset duty cycle, wherein, when the duty cycle of the PWM signal is the fourth preset duty cycle, the power of the electronic water pump when operating according to the PWM signal is less than or equal to 3W.

[0056] The electronic water pump status may be obtained by an external device such as a thermal management system across systems and then sent to the electronic water pump, or may be obtained by the electronic water pump itself.

[0057] While determining that the duty cycle of the PWM signal is the fourth preset duty cycle, and generating a PWM signal based on the fourth preset duty cycle to control the rotation of the impeller, the back electromotive force of the electronic water pump can also be obtained, and the duty cycle of the PWM signal is adjusted in real time according to the back electromotive force, so that the power of the electronic water pump can be maintained at less than or equal to 3W.

[0058] That is to say, when the electronic water pump is in zero flow standby mode, the impeller is kept in slight rotation by the reverse electromotive force, so that the energy consumption of the electronic water pump is ≤3W.

[0059] In some embodiments of the present invention, when the vehicle information includes ambient temperature, vehicle status and a device to be thermally managed, the duty cycle of the PWM signal is determined based on the vehicle information, including: when the ambient temperature is lower than a preset temperature, the vehicle status is in a start-up state and the device to be thermally managed is a power battery, determining that the duty cycle of the PWM signal is a fifth preset duty cycle, wherein the value range of the fifth preset duty cycle is 10% to 30%.

[0060] Specifically, when the vehicle information obtained includes ambient temperature, vehicle status, and thermal management equipment, if it can be determined based on the ambient temperature and vehicle status that the vehicle is currently in a low-temperature start-up stage, and the thermal management equipment is a power battery, the duty cycle of the PWM signal is determined to be the fifth preset duty cycle, and the value range of the fifth preset duty cycle is 10% to 30%, for example, 20%.

[0061] In this way, it is possible to avoid excessive temperature differences in the power battery.

[0062] In some embodiments of the present invention, the above-mentioned vehicle information also includes navigation road condition information obtained by the thermal management system across systems. The thermal management system sends the navigation road condition information to the electronic water pump. The electronic water pump adjusts the duty cycle of the PWM signal in real time according to the road condition information, thereby preloading the water pump power of the electronic water pump according to the navigation road condition. For example, the high-speed mode is started in advance before entering the fast charging station to achieve high-power cooling of the power battery to avoid excessive temperature of the power battery due to charging.

[0063] In summary, the vehicle thermal management system of an embodiment of the present invention can obtain vehicle information by setting an electronic water pump, and determine the duty cycle of the PWM signal that controls the rotation of the electronic water pump impeller according to the vehicle information, thereby realizing real-time adjustment of the power of the electronic water pump based on the vehicle information. When higher power is not required, the power of the electronic water pump can be reduced, thereby reducing the energy consumption of the electronic water pump.

[0064] Furthermore, the present invention provides an electronic water pump.

[0065] Figure 3 4 is a structural block diagram of an electronic water pump according to an embodiment of the present invention.

[0066] like Figure 3 As shown, electronic water pump 500 includes a processor 501 and a memory 503. Processor 501 and memory 503 are connected, for example, via a bus 502. Optionally, electronic water pump 500 may further include a transceiver 504. It should be noted that in practical applications, the number of transceivers 504 is not limited to one, and the structure of electronic water pump 500 does not constitute a limitation on the embodiments of the present invention.

[0067] The processor 501 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the present disclosure. The processor 501 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0068] The bus 502 may include a path for transmitting information between the above components. The bus 502 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 502 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0069] The memory 503 is used to store a computer program corresponding to the vehicle thermal management method of the above embodiment of the present invention, and the computer program is controlled and executed by the processor 501. The processor 501 is used to execute the computer program stored in the memory 503 to implement the content shown in the above method embodiment.

[0070] in, Figure 3 The electronic water pump 500 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0071] In some embodiments of the present invention, the electronic water pump 500 includes a water pump motor, and a micro heat pipe is embedded in the stator winding of the water pump motor.

[0072] Specifically, the water pump motor generates heat during operation. In order to dissipate the heat, a coolant is required, that is, a cooling device needs to be provided for the water pump motor. By supplying coolant to the cooling device, the heat generated by the water pump motor can be taken away.

[0073] At this time, a micro heat pipe is embedded in the motor stator winding of the water pump motor of the electronic water pump 500 to improve the thermal conductivity, thereby achieving heat dissipation for the water pump motor through the micro heat pipe, reducing the water pump motor's demand for coolant, and further reducing the volume and weight of the cooling device matching the water pump motor, thereby reducing the volume and weight of the electronic water pump 500, and reducing the noise during operation of the cooling device, thereby reducing the noise of the electronic water pump 500.

[0074] In some embodiments of the present invention, the electronic water pump 500 also includes an impeller, an outer rotor permanent magnet assembly and an inner rotor magnetic conductive assembly. The water pump motor is mechanically connected to the outer rotor permanent magnet assembly, the impeller is mechanically connected to the inner rotor magnetic conductive assembly, and a non-magnetic isolation cover is provided between the outer rotor permanent magnet assembly and the inner rotor magnetic conductive assembly. The thickness of the non-magnetic isolation cover is less than or equal to 0.5 mm.

[0075] At this point, the pump motor's rotation drives the outer rotor's permanent magnet assembly, which in turn generates a magnetic field that drives the inner rotor's magnetic conductive assembly, which in turn drives the impeller. In other words, the outer rotor's permanent magnet assembly, inner rotor's magnetic conductive assembly, and non-magnetic isolation cover only need to achieve this function and meet the aforementioned 0.5mm requirement.

[0076] Therefore, by adopting magnetic coupling seal and eliminating the transmission shaft seal, the leakage rate can be reduced. Moreover, since the shaft seal is eliminated, the volume of the water pump motor is further reduced, and the integration capability of the water pump motor in the vehicle is improved.

[0077] In some embodiments of the present invention, the electronic water pump 500 includes a water pump motor and a pump body, and the water pump motor and the pump body adopt a common shell structure.

[0078] Thus, the volume of the electronic water pump 500 can be further reduced.

[0079] In some embodiments of the present invention, the housing of the electronic water pump 500 is made of carbon fiber reinforced PEEK material.

[0080] In some embodiments of the present invention, the power devices in the electronic water pump 500 are GaN power devices, which improve the switching frequency and power conversion efficiency.

[0081] The following describes this with a specific example.

[0082] In this specific example, the electronic water pump 500 is improved as follows.

[0083] Compact integrated design:

[0084] 1. The water pump motor and pump body adopt a common shell structure (size ≤ 120×80×60mm), power density ≥ 0.75W / cm 3 .

[0085] 2. Use carbon fiber reinforced PEEK material (density 1.3g / cm 3 , temperature resistant up to 180°C).

[0086] 3. Magnetic coupling seal: eliminates traditional shaft seal, air gap between inner and outer rotors ≤ 0.5mm, leakage rate < 0.1mL / h (meets IP67 protection).

[0087] Automotive-grade cooling system:

[0088] 1. The cooling channel and the battery liquid cooling plate share the same coolant, and the heat source is switched through a three-way valve.

[0089] 2. The motor stator winding is embedded with micro heat pipes, and the thermal conductivity is increased to 400W / (m·K).

[0090] Vehicle thermal management collaborative strategy:

[0091] 1. Receive BTMS / MCU temperature signal and dynamically calculate cooling requirements. The specific code is as follows:

[0092] ifΔT=T_battery-T_target>5℃:

[0093] PWM=100%

[0094] elif 2℃<ΔT≤5℃:

[0095] PWM=70%+6%*(ΔT-2)

[0096] else:

[0097] PWM=50%

[0098] Wherein, T_battery is the current battery temperature, and T_target is the target battery temperature.

[0099] 2. Predictive speed control: Preload the water pump power according to the navigation road conditions (such as starting the high-speed mode in advance before entering the fast charging station).

[0100] Energy consumption optimization technology:

[0101] 1. Using GaN (Gallium Nitride) power devices, the switching frequency is increased to 2MHz, and the power conversion efficiency is ≥93%.

[0102] 2. When in zero flow standby mode, the impeller is kept in slight rotation by reverse electromotive force (energy consumption ≤ 3W).

[0103] Furthermore, the electronic water pump 500 is configured as follows:

[0104] 1. Hardware configuration.

[0105] Brushless motor: 90W / 12-48V wide voltage, peak efficiency 92%.

[0106] Impeller: 30mm diameter, 7-blade asymmetric design, edge curvature radius R=6mm.

[0107] Main control chip: integrated fault diagnosis ASIL-D (Automotive Safety Integrity Level–D) function.

[0108] 2. Workflow.

[0109] Low temperature start-up phase: The water pump runs at 20% PWM to avoid excessive temperature differences in the battery.

[0110] Fast charging and cooling stage: Receive the charging signal from BTMS and switch to the above-mentioned dynamic calculation of cooling requirements.

[0111] Fault protection: If current fluctuation > 15% is detected, a soft shutdown is triggered immediately and reported to the VCU.

[0112] With the above settings, the following results are achieved:

[0113] Compact integrated design: The heat pipe-coolant coupled heat dissipation structure reduces the overall weight of the electronic water pump 500 by 45% and reduces noise.

[0114] Optimize the above workflow strategy: predictive control algorithm, saving 40% energy compared to traditional products.

[0115] The electronic water pump 500 uses GaN functional devices, with a switching frequency increased to 2MHz. It also supports AutoSAR (AUTomotive Open System Architecture), achieving millisecond-level response with the vehicle controller, shortening system response time by more than 80%.

[0116] Specifically, the following results can be produced:

[0117] 1. Save 40% energy compared to traditional products (the average operating energy consumption is 52W at a rated power of 90W).

[0118] 2. Weight reduction of 45% (total mass ≤ 450g).

[0119] 3. Noise level under all working conditions ≤38dB(A) (tested at 1 meter distance).

[0120] 4. Support AutoSAR architecture to achieve millisecond-level response with the vehicle controller.

[0121] See Table 1 below for details.

[0122] Table 1

[0123] Test items The present invention Other technologies Average energy consumption 52W 78W weight 570g 780g 1m noise (3000rpm) 37dB 45dB System response delay ≤20ms ≥100ms

[0124] In summary, the electronic water pump of the embodiment of the present invention can reduce energy consumption by implementing the above-mentioned vehicle thermal management method. Furthermore, by lightweighting and miniaturizing the electronic water pump, the weight and noise of the electronic water pump can be reduced.

[0125] Furthermore, the present invention provides a vehicle.

[0126] Figure 4 4 is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0127] like Figure 4 As shown, the vehicle 100 includes the electronic water pump 500 described above.

[0128] The vehicle according to the embodiment of the present invention can achieve low energy consumption and low noise driving through the above-mentioned electronic water pump.

[0129] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device), or in conjunction with such an instruction execution system, apparatus, or device. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0130] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0131] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0132] In the description of this specification, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present invention.

[0133] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0134] In the description of this specification, unless otherwise specified, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this invention can be understood according to specific circumstances.

[0135] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0136] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A vehicle thermal management method, characterized in that: The method is used for an electronic water pump of a vehicle, and the method comprises: Acquiring vehicle information, wherein the vehicle information includes at least one of a current battery temperature of a power battery, a status of an electronic water pump, an ambient temperature of an environment in which the vehicle is located, a vehicle status, and a device to be thermally managed; Determining a duty cycle of a PWM signal according to the vehicle information, wherein the PWM signal is a signal for the electronic water pump of the vehicle to control the rotation of its own impeller; The system operates according to the PWM signal to achieve thermal management of the vehicle.

2. The vehicle thermal management method according to claim 1, characterized in that: When the vehicle information includes the current battery temperature and the device to be thermally managed, determining the duty cycle of the PWM signal according to the vehicle information includes: When the device to be thermally managed is the power battery, obtaining a temperature difference between the current battery temperature and a target battery temperature; When the temperature difference is greater than a first preset threshold, determining that the duty cycle is a first preset duty cycle, wherein the value range of the first preset duty cycle is 89% to 100%; When the temperature difference is less than or equal to the first preset threshold and greater than a second preset threshold, obtaining a duty cycle of the PWM signal according to the temperature difference; When the temperature difference is less than or equal to the second preset threshold, the duty cycle is determined to be a second preset duty cycle, wherein the value range of the second preset duty cycle is 50% to 69%.

3. The vehicle thermal management method according to claim 2, characterized in that: When the temperature difference is less than or equal to the first preset threshold and greater than the second preset threshold, the duty cycle of the PWM signal is obtained according to the following formula: PWM1=70%+6%×(ΔT-2), Wherein, PWM1 is the duty cycle of the PWM signal, and ΔT is the temperature difference.

4. The vehicle thermal management method according to claim 1, characterized in that: When the vehicle information includes the device to be thermally managed, determining the duty cycle of the PWM signal according to the vehicle information includes: When the device to be thermally managed is a drive motor of the vehicle, the duty cycle of the PWM signal is determined to be a third preset duty cycle.

5. The vehicle thermal management method according to claim 1, characterized in that: When the vehicle information includes the state of an electronic water pump, determining the duty cycle of the PWM signal according to the vehicle information includes: When the electronic water pump is in a zero-flow standby state, the duty cycle of the PWM signal is determined to be a fourth preset duty cycle, wherein when the duty cycle of the PWM signal is the fourth preset duty cycle, the power of the electronic water pump when operating according to the PWM signal is less than or equal to 3W.

6. The vehicle thermal management method according to claim 1, characterized in that: When the vehicle information includes the ambient temperature, the vehicle state, and the device to be thermally managed, determining the duty cycle of the PWM signal according to the vehicle information includes: When the ambient temperature is lower than a preset temperature, the vehicle is in a startup state, and the device to be thermally managed is the power battery, the duty cycle of the PWM signal is determined to be a fifth preset duty cycle, wherein the value range of the fifth preset duty cycle is 10% to 30%.

7. An electronic water pump, characterized in that: The vehicle thermal management method comprises a memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the computer program is executed by the processor, the vehicle thermal management method according to any one of claims 1 to 6 is implemented.

8. The electronic water pump according to claim 7, characterized in that: The electronic water pump comprises a water pump motor, and a micro heat pipe is embedded in the stator winding of the water pump motor.

9. The electronic water pump according to claim 8, characterized in that: The electronic water pump also includes an impeller, an outer rotor permanent magnet assembly and an inner rotor magnetic conductive assembly. The water pump motor is mechanically connected to the outer rotor permanent magnet assembly, and the impeller is mechanically connected to the inner rotor magnetic conductive assembly. A non-magnetic isolation cover is provided between the outer rotor permanent magnet assembly and the inner rotor magnetic conductive assembly, and the thickness of the non-magnetic isolation cover is less than or equal to 0.5 mm.

10. A vehicle, characterized in that: Comprising the electronic water pump according to any one of claims 7-9.

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