A water pump control method, computer equipment, readable storage medium and motor vehicle

Abstract

The application discloses a water pump control method, computer equipment, readable storage medium and motor vehicle, relates to the automobile technical field, and a heat management system controls the water pump of coolant through the water pump control method, and the method comprises the following steps: obtaining VCU request torque, power module junction temperature, power module NTC temperature, motor temperature and water inlet temperature and the required water pump gear of each, taking the maximum value; determining the demand torque of the driver, determining the adjustment value of the water pump gear of the coolant according to the demand torque; the sum of the maximum value and the adjustment value is used as the output water pump gear. The water pump control method provided by the application dynamically adjusts the water pump gear and the coolant flow according to the whole vehicle condition.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, specifically to a water pump control method, a computer device, a readable storage medium, and a motor vehicle. Background Technology

[0002] The Vehicle Control Unit (VCU) collects the position signal from the driver's accelerator pedal, analyzes it, and sends torque commands to the Microcontroller Unit (MCU). The battery pack provides DC power to the MCU, and the output voltage varies with the State of Charge (SOC). Therefore, various parameters such as driving parameters and power parameters change in real time during vehicle operation. As is well known, heat dissipation is crucial for the entire vehicle, especially for electronic components such as the VCU and MCU. Since various parameters change in real time during vehicle operation, the required heat dissipation level varies. If only a few fixed conditions are used to control heat dissipation, the heat dissipation level will remain at the current level when increased heat dissipation is needed, while the cooling system will operate under high load when no significant heat dissipation is required. This not only poses a risk of overheating but also increases unnecessary energy consumption. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a water pump control method that dynamically adjusts the water pump gear and coolant flow rate according to the real-time conditions of the vehicle.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A water pump control method is provided, in which a thermal management system controls a coolant water pump. The water pump control method includes the following steps:

[0006] Obtain the VCU requested torque, power module junction temperature, power module NTC temperature, motor temperature, and inlet water temperature, as well as the required pump speed for each, and take the maximum value among them;

[0007] The driver's required torque is determined based on the current motor speed and the current accelerator pedal opening, and the coolant pump gear adjustment value is determined based on the required torque.

[0008] The sum of the maximum value and the adjustment value is used as the output pump speed.

[0009] The technical solution provided by this invention dynamically evaluates the current required water pump level based on the operating parameters of the three electric components, such as VCU requested torque, motor temperature, inlet water temperature, power module NTC temperature, power module junction temperature, etc., as well as the required water pump level for each component. This achieves autonomous control of the water pump level, improves the response speed of cooling flow, and is more refined than the overall vehicle thermal management evaluation. Under the premise of meeting heat dissipation requirements, it achieves low-power operation of the water pump as much as possible, thus saving energy.

[0010] Optionally, the VCU requested torque, power module junction temperature, power module NTC temperature, motor temperature and inlet temperature are each provided with a gear threshold value, and the gear threshold value is provided with a first hysteresis coefficient.

[0011] The first hysteresis coefficient is used to prevent fluctuations in the motor controller when the aforementioned physical quantities drop.

[0012] Optionally, the driver's required torque is the product of the accelerator pedal opening and the maximum torque limit, which is obtained from the motor speed.

[0013] Optionally, if the driver's required torque is greater than or equal to the current torque limit, the water pump gear adjustment value is 1, and the timer is started simultaneously; otherwise, the water pump gear adjustment value is 0. If the timer duration is greater than the preset time, the water pump gear adjustment value is 2.

[0014] Optionally, the current torque limiter has a second hysteresis coefficient.

[0015] By comparing the driver's required torque with the junction temperature torque limit, the system assesses whether insufficient coolant flow is causing the motor controller to limit torque. It then increases the water pump speed to reduce the torque limit, achieving automatic adjustment. Simultaneously, the setting of a second hysteresis coefficient prevents fluctuations in the motor controller when the accelerator pedal opening decreases.

[0016] Optionally, after the sum of the maximum value and the adjustment value is used as the output water pump gear, it is determined whether the opening of the accelerator pedal is greater than the preset opening. If it is greater, the lower limit of the water pump gear is set to 3; otherwise, the water pump gear remains unchanged.

[0017] Optionally, the preset opening degree is provided with a third hysteresis coefficient.

[0018] The accelerator pedal opening is a crucial indicator of the driver's intentions, and there is a certain delay between the driver pressing the accelerator pedal and the VCU outputting the requested torque. The technical solution provided by this invention can pre-control the water pump's rating, avoiding the risk of overheating due to insufficient cooling, and also preventing the water pump from operating at high power when high-power cooling is not required, thus saving energy.

[0019] In addition, the present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the water pump control method described in any of the above claims.

[0020] In addition, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the water pump control method described in any of the above claims.

[0021] Furthermore, the present invention also provides a motor vehicle having a thermal management system, wherein the thermal management system controls the coolant pump by the water pump control method described in any one of the foregoing claims.

[0022] Or the motor vehicle has the aforementioned computer equipment;

[0023] Alternatively, the motor vehicle may have the aforementioned computer-readable storage medium, and the computer program, when executed by a processor, implements the water pump control method described in any of the preceding claims.

[0024] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of the present invention will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of the present invention. In addition, each of these features, elements and components appearing in the following text and drawings is a plurality of, and different symbols or numbers are used for convenience of representation, but all represent parts with the same or similar construction or function. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the process in an embodiment of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0028] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this patent. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0029] Example:

[0030] like Figure 1 As shown, this embodiment provides a water pump control method for hybrid electric vehicles, plug-in hybrid electric vehicles, range-extended electric vehicles, and pure electric vehicles. All of these types of vehicles are equipped with an electric motor, a battery pack that provides power to the motor, and a motor controller that controls the motor. They are also equipped with a water pump and cooling water channels for cooling the battery, motor, and motor controller. The cooling water pump is controlled by a thermal management system using the water pump control method provided in this embodiment, including the following steps:

[0031] Obtain the VCU requested torque, power module junction temperature, power module NTC temperature, motor temperature, and inlet water temperature, as well as the required pump speed for each.

[0032] Specifically, in this embodiment, when the VCU requests torque ≠ 0 Nm, the water pump is set to L2, i.e., the flow rate is 8 L / min. When the VCU requests torque equal to 0 Nm, the water pump is set to L2 for the first 10 seconds, i.e., the flow rate is 8 L / min; after 10 seconds, the water pump is set to L1, i.e., the flow rate is 3 L / min, as shown in the table below:

[0033]

[0034] The relationship between the junction temperature range of the power module and the water pump speed is shown in the table below:

[0035]

[0036] The relationship between the NTC temperature range of the power module and the water pump setting is shown in the table below:

[0037]

[0038] The relationship between the motor temperature range and the water pump speed is shown in the table below:

[0039]

[0040] The relationship between the inlet water temperature range and the water pump speed is shown in the table below:

[0041]

[0042]

[0043] It should be noted that this embodiment targets compact vehicles, including compact sedans and compact SUVs. When dealing with other vehicle types such as mid-size cars and large-size cars, the relationship between the above-mentioned physical quantity ranges and water pump gears can be adaptively adjusted by those skilled in the art during calibration and adjustment according to the actual vehicle type. This adjustment method is well-known prior art and is not limited here. Those skilled in the art should understand that the relationship between the physical quantity ranges and water pump gears in this table is merely a preferred embodiment and not a limitation on the technical solution.

[0044] As can be seen, the VCU requested torque, power module junction temperature, power module NTC temperature, motor temperature, and inlet water temperature each have their own gear thresholds. Therefore, each gear threshold for each physical quantity has a first hysteresis coefficient. When the vehicle is running, each operating parameter rises and reaches its corresponding gear threshold before shifting to the next gear. Since each operating parameter changes in real time, the VCU requested torque, power module junction temperature, power module NTC temperature, motor temperature, and inlet water temperature may all decrease. Once they drop to the gear threshold, they shift back to the previous gear. If the operating parameters fluctuate around the gear threshold, it will cause gear shifting. This will result in the water pump gears constantly shifting. In this embodiment, a first hysteresis coefficient is set for the gear threshold values ​​of VCU requested torque, power module junction temperature, power module NTC temperature, motor temperature, and inlet temperature. This causes a difference between the arrival of each gear threshold value during the upward and downward movements. Only when the actual value of the gear threshold value reached during the downward movement is less than the actual value of the gear threshold value reached during the upward movement can the pump return to the previous gear. This avoids gear jumps caused by fluctuations in physical quantities near the gear threshold values, keeping the pump gear stable and preventing gear jumps.

[0045] After obtaining the required water pump settings, take the maximum value among them.

[0046] The driver's required torque is determined based on the current motor speed and the current accelerator pedal opening. The driver's required torque is the product of the accelerator pedal opening and the maximum torque limit, which is obtained from the motor speed through a lookup table. Specifically, in this embodiment, the relationship between the motor speed and the maximum torque limit is shown in the following table:

[0047] motor speed 1000r / min 2000r / min 3000r / min 4000r / min 5000r / min ……… 16000r / min Maximum torque limit 360Nm 360Nm 360Nm 360Nm 360Nm ……… 40Nm

[0048] It should also be noted that this embodiment targets compact vehicles, including compact sedans and compact SUVs. When dealing with other vehicle types such as mid-size cars and large-size cars, the maximum torque limit can be adaptively adjusted by those skilled in the art during calibration and adjustment based on the actual vehicle type. The specific adjustment methods are existing technologies known in the art and are not limited here. Those skilled in the art should understand that the maximum torque limit in this table is only a preferred embodiment and not a limitation on the technical solution.

[0049] If the driver's required torque is greater than or equal to the current torque limit, the water pump gear adjustment value is 1, and a timer is started; otherwise, the water pump gear adjustment value is 0. If the timer duration exceeds a preset time, the water pump gear adjustment value is 2. In this embodiment, the preset time is 20 seconds. In other embodiments, the preset time can be flexibly selected by those skilled in the art during calibration and adjustment according to requirements. No limitation is made here. Similarly, to avoid water pump gear fluctuations, a second hysteresis coefficient is also set for the torque limit.

[0050] By comparing the driver's required torque with the junction temperature torque limit, the system assesses whether insufficient coolant flow is causing the motor controller to limit torque. It then increases the water pump speed to reduce the torque limit, achieving automatic adjustment. Simultaneously, the setting of a second hysteresis coefficient prevents fluctuations in the motor controller when the accelerator pedal opening decreases.

[0051] The setting of the first hysteresis coefficient and the second hysteresis coefficient can also be flexibly set by those skilled in the art based on conditions such as vehicle model, motor model, and battery capacity.

[0052] The sum of the maximum value and the adjustment value is used as the output pump speed. In this embodiment, the maximum limit of the pump speed is L4, which is 16L / min.

[0053] After the sum of the maximum value and the adjustment value is used as the output water pump gear, it is determined whether the accelerator pedal opening is greater than the preset opening. The accelerator pedal opening is an important basis for judging the driver's intention. Specifically, in this embodiment, the preset opening is 80% of the maximum accelerator pedal opening. In other embodiments, the preset opening can be flexibly set by those skilled in the art during calibration and adjustment, and is not limited here. If the opening is greater than the preset opening, the lower limit of the water pump gear is set to 3; otherwise, the water pump gear remains unchanged. There is a certain delay between the driver pressing the accelerator pedal and the VCU outputting the requested torque. The technical solution provided in this embodiment can control the water pump level in advance, avoiding the risk of overheating caused by untimely cooling, and also avoiding high-power operation of the water pump when high-power cooling is not required, thus saving energy.

[0054] Similarly, to prevent the water pump speed from fluctuating, a third hysteresis coefficient is set for the preset opening degree. The setting of the third hysteresis coefficient can also be flexibly set by those skilled in the art based on conditions such as vehicle model, motor model, and battery capacity.

[0055] The technical solution provided in this embodiment dynamically evaluates the current required water pump level based on the operating parameters of the three electric components, such as the VCU requested torque, motor temperature, inlet water temperature, power module NTC temperature, power module junction temperature, etc., as well as the required water pump level for each. This achieves autonomous control of the water pump level, improves the response speed of cooling flow, and is more refined than the whole vehicle thermal management evaluation. Under the premise of meeting the heat dissipation requirements, it can achieve the lowest power consumption operation of the water pump as much as possible, thus saving energy.

[0056] Meanwhile, this embodiment also provides a computer device, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the point cloud semantic segmentation method described above.

[0057] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. Accordingly, the computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can implement the methods of any of the above embodiments. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0058] Furthermore, this embodiment also provides a motor vehicle having a thermal management system, which controls the coolant pump using the aforementioned water pump control method.

[0059] Or the motor vehicle has the aforementioned computer equipment;

[0060] The vehicle or motor vehicle has the aforementioned computer-readable storage medium, and the computer program, when executed by a processor, implements the aforementioned water pump control method.

[0061] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A water pump control method, characterized in that, The thermal management system controls the coolant pump through the aforementioned pump control method, which includes the following steps: Obtain the VCU requested torque, power module junction temperature, power module NTC temperature, motor temperature, and inlet water temperature, as well as the required pump speed for each, and take the maximum value among them; The driver's required torque is determined based on the current motor speed and the current accelerator pedal opening, and the coolant pump gear adjustment value is determined based on the required torque. The sum of the maximum value and the adjustment value is used as the output pump speed. Specifically, if the driver's required torque is greater than or equal to the current torque limit, the water pump gear adjustment value is 1, and the timing is started simultaneously; otherwise, the water pump gear adjustment value is 0. If the timing time is greater than the preset time, the water pump gear adjustment value is 2.

2. The water pump control method according to claim 1, characterized in that, The VCU requested torque, power module junction temperature, power module NTC temperature, motor temperature, and inlet temperature are each provided with a gear threshold value, and the gear threshold value is provided with a first hysteresis coefficient.

3. The water pump control method according to claim 1, characterized in that, The driver's required torque is the product of the accelerator pedal opening and the maximum torque limit, which is obtained from the motor speed.

4. The water pump control method according to claim 1, characterized in that, The current torque limiter has a second hysteresis coefficient.

5. The water pump control method according to any one of claims 1 to 4, characterized in that, After the sum of the maximum value and the adjustment value is used as the output water pump gear, it is determined whether the opening of the accelerator pedal is greater than the preset opening. If it is greater, the lower limit of the water pump gear is set to 3; otherwise, the water pump gear remains unchanged.

6. The water pump control method according to claim 5, characterized in that, The preset opening degree is equipped with a third hysteresis coefficient.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the water pump control method according to any one of claims 1 to 6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the water pump control method according to any one of claims 1 to 6.

9. A motor vehicle, characterized in that, The motor vehicle has a thermal management system, which controls the coolant pump using the water pump control method according to any one of claims 1 to 6.

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