Control method and control system of electronic water pump

Abstract

The invention discloses a control method and system for an electronic water pump, and relates to the technical field of vehicle cooling. The electronic water pump acts on a liquid cooling pipeline, and the control method of the electronic water pump comprises the steps that a control unit obtains the temperature of the liquid cooling pipeline, and operation of an axial motor is controlled based on the comparison result of the temperature of the liquid cooling pipeline and a first temperature threshold value; and if the temperature of the liquid cooling pipeline continuously rises to a second temperature threshold value, a radial motor is controlled to operate, and the axial motor and the radial motor control the electronic water pump to operate at the same time. The temperature of the liquid cooling pipeline is obtained through the control unit, and the operation states of the axial motor and the radial motor are dynamically adjusted according to the temperature change, so that the purposes of energy conservation, high efficiency, flexible adjustment, reliability improvement and performance optimization can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle cooling, and in particular to a control method and a control system for an electronic water pump. Background Art

[0002] At present, the electronic water pumps in vehicles are mostly controlled by a single motor. When the temperature is too high, the electronic water pump works to achieve cooling.

[0003] However, the control effect of a single motor is not good, and there is no fault detection function for the working status of the motor. Summary of the invention

[0004] In order to solve the above problems, the first aspect of the present invention provides a control method for an electronic water pump, wherein the electronic water pump acts on a liquid cooling pipeline, comprising: The control unit acquires the temperature of the liquid cooling pipeline, and controls the operation of the axial motor based on a comparison result between the temperature of the liquid cooling pipeline and a first temperature threshold; If the temperature of the liquid cooling pipeline continues to rise to a second temperature threshold, the radial motor is controlled to operate, and the axial motor and the radial motor simultaneously control the electronic water pump to operate.

[0005] Wherein, before the axial motor is started, the rotor position of the axial motor is obtained, and if the rotor position is not at a preset position, the rotor position is adjusted to the preset position.

[0006] The control unit performs fault diagnosis on the electronic water pump based on a signal diagnosis interface, and sends a signal of a specific frequency to the ECU to feedback the fault based on the fault diagnosis result.

[0007] Among them, the control unit obtains the rotor position of the axial motor based on the signal diagnostic interface to know the working state of the axial motor, and compares the working state of the axial motor with the control signal issued by the control unit to obtain the control deviation of the axial motor. If the control deviation of the axial motor is greater than a first preset threshold, the control unit sends a first fault signal to the ECU.

[0008] Among them, the control unit obtains the rotor position of the radial motor based on the signal diagnostic interface to know the working state of the radial motor, and compares the working state of the radial motor with the control signal issued by the control unit to obtain the control deviation of the radial motor. If the control deviation of the radial motor is greater than a second preset threshold, the control unit sends a second fault signal to the ECU.

[0009] Wherein, the control unit includes a self-checking module, and the self-checking module obtains the working state of the control unit. If the control unit works abnormally, the control unit sends a third fault signal to the ECU.

[0010] The second aspect of the present invention also provides a control system for an electronic water pump, which can apply the control method as described in any of the above items, the control system includes a control unit, an electronic water pump and a liquid cooling pipeline; the control unit sends a control signal to the electronic water pump to control the operation of the electronic water pump; the control unit obtains the temperature of the liquid cooling pipeline and controls the operation of the electronic water pump based on the temperature of the liquid cooling pipeline; the electronic water pump is connected to the liquid cooling pipeline, and the liquid cooling pipeline is cooled based on the operation of the electronic water pump.

[0011] The control unit may obtain the working state of the electronic water pump, and adjust the output control signal based on the working state of the electronic water pump to realize feedback control.

[0012] The third aspect of the present invention further provides an electronic device, comprising: a memory and a processor coupled to each other, wherein the processor is used to execute program instructions stored in the memory to implement any of the control methods described above.

[0013] A fourth aspect of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores program data, and the program data can be executed by a processor to implement any of the control methods described above.

[0014] Beneficial effects of the present invention: Different from the prior art, the present invention discloses a control method and control system for an electronic water pump, which relates to the field of vehicle cooling technology; the electronic water pump acts on a liquid cooling pipeline, and the control method of the electronic water pump includes: a control unit obtains the temperature of the liquid cooling pipeline, and controls the operation of the axial motor based on the comparison result between the temperature of the liquid cooling pipeline and the first temperature threshold; if the temperature of the liquid cooling pipeline continues to rise to the second temperature threshold, the radial motor is controlled to operate, and the axial motor and the radial motor simultaneously control the operation of the electronic water pump. By obtaining the temperature of the liquid cooling pipeline through the control unit, and dynamically adjusting the operating states of the axial motor and the radial motor according to the temperature change, the purposes of energy saving and high efficiency, flexible adjustment, improved reliability and optimized performance can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic flow chart of a control method for an electronic water pump provided in one embodiment of the present invention; Figure 2 A schematic flow chart of a control method for an electronic water pump provided in yet another embodiment of the present invention; Figure 3A schematic diagram of the structure of a control system of an electronic water pump provided in one embodiment of the present invention; Figure 4 It is a structural schematic diagram of an embodiment of an electronic device of the present invention; Figure 5 It is a schematic diagram of the structure of an embodiment of a computer-readable storage medium of the present invention. DETAILED DESCRIPTION

[0016] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0017] In the existing liquid cooling system, the electronic water pump is one of the key components, which is responsible for driving the coolant circulation to remove heat. However, traditional electronic water pumps have problems such as slow response speed and low energy efficiency. With the development of technology, higher requirements are put forward for the control accuracy and response speed of electronic water pumps. Therefore, developing a new electronic water pump control method to improve its performance and reliability has become an urgent problem to be solved.

[0018] like Figure 1 As shown, Figure 1 This is a flow chart of a control method for an electronic water pump provided by an embodiment of the present invention. The control method for an electronic water pump of this embodiment includes the following steps: Step S11: The control unit obtains the temperature of the liquid cooling pipeline, and controls the operation of the axial motor based on the comparison result between the temperature of the liquid cooling pipeline and the first temperature threshold; the control unit obtains the current temperature data through the temperature sensor installed on the liquid cooling pipeline, and the temperature data is transmitted to the control unit through the sensor, and the control unit compares the obtained temperature data with the preset first temperature threshold; if the temperature is lower than or equal to the first temperature threshold, the control unit keeps the current state of the axial motor unchanged; if the temperature exceeds the first temperature threshold, the control unit starts the axial motor to increase the flow of the electronic water pump, thereby improving the heat dissipation efficiency.

[0019] Step S12: The control unit continues to monitor the temperature of the liquid cooling pipeline in real time. If the temperature of the liquid cooling pipeline continues to rise to the second temperature threshold, the radial motor is controlled to operate, and the axial motor and the radial motor simultaneously control the operation of the electronic water pump; the coordinated operation of the dual motors can further increase the flow and pressure of the electronic water pump, improve the heat dissipation effect, and prevent system damage due to excessive temperature.

[0020] By starting the axial motor and radial motor in stages, the working state of the electronic water pump can be dynamically adjusted according to the actual temperature demand, thereby more effectively managing the temperature of the liquid cooling system. When the temperature is low, starting only the axial motor can save energy; when the temperature is high, starting the radial motor can quickly increase the heat dissipation capacity and ensure that the system can still maintain stable operation under high load.

[0021] In summary, the control method of the electronic water pump of the present invention includes: the control unit obtains the temperature of the liquid cooling pipeline, and controls the operation of the axial motor based on the comparison result between the temperature of the liquid cooling pipeline and the first temperature threshold; if the temperature of the liquid cooling pipeline continues to rise to the second temperature threshold, the radial motor is controlled to operate, and the axial motor and the radial motor simultaneously control the operation of the electronic water pump. By obtaining the temperature of the liquid cooling pipeline by the control unit, and dynamically adjusting the operating states of the axial motor and the radial motor according to the temperature change, the purpose of energy saving and high efficiency, flexible adjustment, improved reliability and optimized performance can be achieved.

[0022] In one embodiment, before the axial motor is started, the rotor position of the axial motor is obtained, and the control unit obtains the current position of the axial motor rotor through a position sensor; if the rotor position is not at a preset position, the rotor position is adjusted to the preset position; the preset position refers to a position where a certain angle is maintained between the rotor and the axial stator to ensure that the maximum torque can be generated when the motor is started to avoid piston movement.

[0023] After the rotor is reset to the preset position, the axial motor can generate the maximum initial torque when starting, ensuring that the motor can start smoothly; ensuring that the rotor starts at the preset position can reduce mechanical shock and wear during startup and extend the service life of the axial motor.

[0024] like Figure 2 As shown, Figure 2 A flow chart of a control method for an electronic water pump provided in another embodiment of the present invention includes the following steps: Determine whether the temperature is greater than the first temperature threshold, that is, the control unit obtains the temperature of the liquid cooling pipeline and compares it with the first temperature threshold; if the temperature of the liquid cooling pipeline is greater than the first temperature threshold, the axial motor is controlled to work; if the temperature of the liquid cooling pipeline is not greater than the first temperature threshold, the axial motor is controlled not to work.

[0025] Before the axial motor is started, the rotor needs to be reset to ensure that the rotor position is at a preset position when the axial motor is started to prevent the axial motor from having linear piston motion. After the reset is completed, the stator of the axial motor is energized and the axial motor works.

[0026] The control unit continuously monitors the temperature of the liquid cooling pipeline; if the temperature drops below the first temperature threshold, the axial motor stator is powered off; if the temperature is higher than the first temperature threshold but lower than the second temperature threshold, the axial motor continues to work; if the temperature rises to the second temperature threshold, the radial motor is controlled to work; the radial motor is shut down together with the axial motor only after the temperature of the liquid cooling pipeline drops below the first temperature threshold, to prevent the radial motor from frequently starting and stopping when the temperature fluctuates repeatedly at the second temperature threshold.

[0027] It should be clarified that the present invention does not limit the specific values ​​of the first temperature threshold and the second temperature threshold, as long as the first temperature threshold is lower than the second temperature threshold; for example, the first temperature threshold is 80°C and the second temperature threshold is 100°C.

[0028] In one embodiment, the control unit performs fault diagnosis on the electronic water pump based on the signal diagnostic interface. The control unit sends a signal of a specific frequency to the ECU to feedback the fault based on the fault diagnosis result. The control unit monitors the operating status of the electronic water pump in real time through the signal diagnostic interface, including but not limited to key parameters such as temperature, current, voltage, and rotor position.

[0029] In one embodiment, the control unit obtains the rotor position of the axial motor based on the signal diagnostic interface to know the working state of the axial motor, and compares the working state of the axial motor with the control signal sent by the control unit to obtain the control deviation of the axial motor. If the control deviation of the axial motor is greater than a first preset threshold, the control unit sends a first fault signal to the ECU.

[0030] The control unit records the control signal currently issued, such as the frequency and duty cycle of the PWM signal; the control unit obtains the rotor position information of the axial motor in real time through the signal diagnostic interface; the control unit compares the obtained axial motor rotor position with the expected position, and calculates the deviation between the actual position and the expected position; the control unit compares the calculated control deviation with the first preset threshold value to determine whether the deviation exceeds the threshold; if the control deviation is greater than the first preset threshold value, the control unit sends a first fault signal to the ECU through the signal diagnostic interface to notify the ECU that there is a control deviation in the axial motor; for example, the actual rotor position of the axial motor is P1, the expected position corresponding to the current control signal is P2, and the control deviation is, the control control is compared with the first preset threshold value to determine whether the control unit sends a fault signal to the ECU.

[0031] In one embodiment, the control unit obtains the rotor position of the radial motor based on the signal diagnosis interface to know the working state of the radial motor, compares the working state of the radial motor with the control signal sent by the control unit to obtain the control deviation of the radial motor, and if the control deviation of the radial motor is greater than the second preset threshold, the control unit sends a second fault signal to the ECU. The control deviation of the radial motor is the same as the control deviation of the axial motor in principle, which will not be repeated here; it should be clear that the second preset threshold and the first preset threshold can be the same or different, and no limitation is made here.

[0032] In one embodiment, the control unit includes a self-checking module, which obtains the working state of the control unit. If the control unit works abnormally, the control unit sends a third fault signal to the ECU; the self-checking module can realize regular self-checking, for example, the self-checking module performs self-checking on the control unit every 10 seconds; in other embodiments, the interval time can also be another value, which is not limited here. The self-checking module obtains the working state of the control unit, including but not limited to: obtaining the link state between the control unit and the ECU, whether the voltage and current are within the normal range, and the temperature of the control unit.

[0033] In order to ensure that the ECU can better obtain the link of sending the fault, the first fault signal, the second fault signal and the third fault signal select signals of different frequencies, so that the ECU can locate the source of the fault in time; it improves the reliability and safety of the system, optimizes the overall performance and reduces maintenance costs.

[0034] The present invention also provides a control system for an electronic water pump, which can be applied to the control method of any of the above embodiments, such as Figure 3 As shown, Figure 3 This is a schematic structural diagram of a control system for an electronic water pump provided in one embodiment of the present invention. The control system includes a control unit, an electronic water pump and a liquid cooling pipeline.

[0035] The control unit sends a control signal to the electronic water pump to control the operation of the electronic water pump; the control unit obtains the temperature of the liquid cooling pipeline and controls the operation of the electronic water pump based on the temperature of the liquid cooling pipeline; the electronic water pump is connected to the liquid cooling pipeline, and the liquid cooling pipeline is cooled based on the operation of the electronic water pump. By real-time monitoring of the temperature of the liquid cooling pipeline and dynamically adjusting the working state of the electronic water pump according to temperature changes, precise control of the cooling system can be achieved to ensure that the temperature of the liquid cooling pipeline is always kept within a reasonable range; the reliability and safety of the system are improved, the overall performance is optimized, and the maintenance cost is reduced.

[0036] In one embodiment, the control unit can obtain the working state of the electronic water pump and adjust the output control signal based on the working state of the electronic water pump to realize feedback control. By obtaining the working state of the electronic water pump in real time and analyzing it, the control unit can adjust the control signal more accurately to ensure that the electronic water pump is always in the best working state; the control unit can dynamically adjust the control signal according to the actual working state of the electronic water pump, improve the adaptability and flexibility of the system, and ensure stable operation under various working conditions.

[0037] For the above embodiment, the present invention provides an electronic device, see Figure 4 , Figure 4The electronic device of the present invention comprises a memory and a processor, wherein the memory and the processor are coupled to each other, the memory stores program data, and the processor is used to execute the program data to implement the steps of any embodiment of the above-mentioned electronic water pump control method.

[0038] In this embodiment, the processor may also be referred to as a CPU (Central Processing Unit). The processor may be an integrated circuit chip having signal processing capabilities. The processor may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0039] The method of the above embodiment can be implemented in the form of a computer program, so the present invention provides a computer readable storage medium, see Figure 5 , Figure 5 The structure diagram of an embodiment of a computer-readable storage medium of the present invention is shown in FIG. The computer-readable storage medium stores program data that can be run by a processor, and the program data can be executed by the processor to implement the steps of any embodiment of the above-mentioned electronic water pump control method.

[0040] The computer-readable storage medium in this embodiment may be a medium that can store program data, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or may be a server that stores the program data. The server may send the stored program data to other devices for execution, or may execute the stored program data by itself.

[0041] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for an electronic water pump, wherein the electronic water pump acts on a liquid cooling pipeline, characterized in that: include: The control unit acquires the temperature of the liquid cooling pipeline, and controls the operation of the axial motor based on a comparison result between the temperature of the liquid cooling pipeline and a first temperature threshold; If the temperature of the liquid cooling pipeline continues to rise to a second temperature threshold, the radial motor is controlled to operate, and the axial motor and the radial motor simultaneously control the electronic water pump to operate.

2. The control method according to claim 1, characterized in that: Before the axial motor is started, the rotor position of the axial motor is obtained. If the rotor position is not at a preset position, the rotor position is adjusted to the preset position.

3. The control method according to claim 2, characterized in that: The control unit performs fault diagnosis on the electronic water pump based on a signal diagnosis interface, and sends a signal of a specific frequency to the ECU to feedback the fault based on the fault diagnosis result.

4. The control method according to claim 3, characterized in that: The control unit obtains the rotor position of the axial motor based on the signal diagnostic interface to learn the working state of the axial motor, and compares the working state of the axial motor with the control signal sent by the control unit to obtain the control deviation of the axial motor. If the control deviation of the axial motor is greater than a first preset threshold, the control unit sends a first fault signal to the ECU.

5. The control method according to claim 3, characterized in that: The control unit obtains the rotor position of the radial motor based on the signal diagnostic interface to learn the working state of the radial motor, and compares the working state of the radial motor with the control signal sent by the control unit to obtain the control deviation of the radial motor. If the control deviation of the radial motor is greater than a second preset threshold, the control unit sends a second fault signal to the ECU.

6. The control method according to claim 3, characterized in that: The control unit includes a self-checking module, and the self-checking module obtains the working state of the control unit. If the control unit works abnormally, the control unit sends a third fault signal to the ECU.

7. A control system for an electronic water pump, which can be applied to the control method according to any one of claims 1 to 6, characterized in that: The control system includes a control unit, an electronic water pump and a liquid cooling pipeline; the control unit sends a control signal to the electronic water pump to control the operation of the electronic water pump; the control unit obtains the temperature of the liquid cooling pipeline and controls the operation of the electronic water pump based on the temperature of the liquid cooling pipeline; the electronic water pump is connected to the liquid cooling pipeline, and the liquid cooling pipeline is cooled based on the operation of the electronic water pump.

8. The control system according to claim 7, characterized in that: The control unit can obtain the working state of the electronic water pump and adjust the output control signal based on the working state of the electronic water pump to realize feedback control.

9. An electronic device, characterized in that: The electronic device comprises: a memory and a processor coupled to each other, wherein the processor is used to execute program instructions stored in the memory to implement the control method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program data, and the program data can be executed by a processor to implement the control method according to any one of claims 1 to 6.

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