Motor water pump fault protection control method and device and vehicle

Abstract

According to the technical scheme, the motor water pump fault protection control method and device and the vehicle are characterized in that the method comprises the following steps that when a water pump is locked, blocking removal work is executed; if the water pump is still locked after the card removing work is executed, the water pump is controlled to rotate reversely; and if the water pump is still locked after the water pump rotates reversely, water pump stalling protection is executed. A fault degradation hierarchical control strategy is carried out, and it is guaranteed that after the water pump is locked, anchoring and power loss of the driving motor are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobiles, and in particular relates to a motor water pump fault protection control method, device and vehicle. Background Art

[0002] In pure electric or hybrid vehicles, water cooling is used to prevent the drive motor and controller from overheating, so different water pump speeds need to be controlled in different scenarios. However, relying on the stable operation of the water pump also brings reliability problems. The stoppage of the water pump can easily lead to insufficient heat dissipation capacity of the motor body and controller, causing damage to the motor and controller.

[0003] When the water pump for cooling the vehicle's drive motor is blocked and stops working, there is no way to effectively dissipate the heat of the drive motor. When the drive motor reaches the temperature limit, it will lose power and break down.

[0004] In the prior art, a backup water pump or a partitioned cooling circuit is usually started to cool the drive motor, but this method will significantly increase the manufacturing and maintenance costs of the vehicle. Alternatively, when the drive motor temperature reaches a limit, the power output of the drive motor is reduced or the vehicle speed is reduced to reduce the load, thereby reducing the heat generated by the motor; however, this method generally uses a single temperature limit value setting, which has a delayed response and is prone to triggering unnecessary protection actions, affecting vehicle performance.

[0005] At the same time, the process for handling water pump stall faults and driving motor over-temperature protection in the prior art is too simple, which can easily lead to the driving motor breaking down and losing power, causing trouble to users. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and to provide a motor water pump fault protection control method, device and vehicle. When the water pump has a performance failure (such as stalling, etc.), a fault degradation and classification control strategy is implemented to ensure that after the water pump stalls, the drive motor is prevented from running aground and losing power.

[0007] The technical solution adopted by the present invention is: a motor water pump fault protection control method, comprising the following steps:

[0008] When the water pump is blocked, remove the jam;

[0009] If the water pump is still blocked after the jam removal is completed, control the water pump to reverse;

[0010] If the water pump is still blocked after the water pump is reversed, the water pump stall protection is executed.

[0011] The above technical solution also includes the following steps: when the water pump is blocked, the output torque of the drive motor is adjusted according to the real-time temperature of the drive motor and its controller to avoid continuous increase in the temperature of the drive motor and its controller.

[0012] In the above technical solution, the card removal action is performed by increasing the rotational torque.

[0013] In the above technical solution, the rotational torque is increased by increasing the working current of the driving motor to a set value within a set time period.

[0014] In the above technical solution, the process of adjusting the output torque of the drive motor according to the real-time temperature of the drive motor and its controller includes: if the temperature of the drive motor and its controller does not exceed the first threshold temperature, the output torque of the drive motor is not adjusted.

[0015] In the above technical solution, if the temperature of the drive motor and its controller exceeds the first threshold temperature but does not exceed the second threshold temperature, the output torque of the drive motor is limited to below the output torque value corresponding to the first threshold temperature.

[0016] In the above technical solution, the motor output torque is reduced and the rate of change of the motor output torque is limited to below a set value, so that the motor output torque reaches below the output torque value corresponding to the first threshold temperature.

[0017] In the above technical solution, the adjustment size of the output torque complies with the following restriction function:

[0018] ΔT=(9.55*P / n)*(t 限 / t 检 )

[0019] T 限 =T 检 -ΔT

[0020] in:

[0021] ΔT: Output torque adjustment, in Newton meters (Nm);

[0022] P: real-time power of the drive motor, in kilowatts (kW);

[0023] n: real-time speed of the drive motor, in revolutions per minute (rpm);

[0024] T 限 : Output torque value corresponding to the first threshold temperature, in Newton meters (Nm);

[0025] T 检 : The limit torque corresponding to the detected temperature of the drive motor and its controller, in Newton meters (Nm);

[0026] t 限 : first threshold temperature, unit Kelvin (k);

[0027] t 检 : The detected temperature of the drive motor and its controller, in Kelvin (K).

[0028] In the above technical solution, if the temperature of the drive motor and its controller exceeds the second threshold temperature, the output torque of the drive motor is reduced to a set proportional value of its peak torque and stops after a set time.

[0029] In the above technical solution, temperature sensors are used to collect the temperature values ​​of the drive motor and the drive motor controller in real time; corresponding limit values ​​are set for the drive motor and the drive motor controller respectively; the temperature value with the smaller difference between the two temperature values ​​and the corresponding limit values ​​is taken as the temperature of the drive motor and its controller, which is used for comparison between the first threshold temperature and the second threshold temperature.

[0030] The present invention also provides a motor water pump fault protection control device, comprising a water pump protection action module and a temperature protection module; wherein:

[0031] The water pump protection working module is used to perform the jam removal work when the water pump is blocked; if the water pump is still blocked after the jam removal work is completed, the water pump is controlled to reverse; if the water pump is still blocked after the water pump is reversed, the water pump stop protection is performed;

[0032] The temperature protection module is used to adjust the output torque of the drive motor according to the real-time temperature of the drive motor and its controller when the water pump is blocked, so as to prevent the temperature of the drive motor and its controller from continuing to rise.

[0033] The present invention also provides a vehicle, wherein the central control unit of the vehicle is used to execute the steps of the motor water pump fault protection control method as described in the above technical solution.

[0034] The beneficial effects of the present invention are: while effectively saving costs, the present invention implements a fault degradation hierarchical control strategy for the drive motor when a performance failure (i.e., stalling) occurs in the water pump, which can prevent the drive motor from being unable to be effectively cooled down after the water pump fails, thereby causing it to stall. After the water pump fails to effectively cool the drive motor, the present invention can execute a hierarchical protection strategy based on the real-time temperature of the drive motor and its controller, adjust the output torque of the drive motor, avoid the temperature of the drive motor and its controller from continuing to rise to cause overheating and damage, and avoid the drive motor from being immediately powered off and breaking down after the water pump fails, causing power loss and causing trouble for customers.

[0035] Furthermore, the present invention adjusts the output torque of the drive motor according to the temperature of the drive motor and its controller, which can avoid the electric drive circuit water pump from stalling due to a malfunction while avoiding overheating and damage to the motor body and the controller.

[0036] Furthermore, the present invention increases the rotational torque to remove the jam, thereby instantly solving the jam problem, gradually changing the operation, reducing physical intervention while protecting the equipment and avoiding shutdown for maintenance.

[0037] Furthermore, the present invention increases the torque by increasing the working current of the driving motor to a set value within a set time period, thereby effectively relieving the stall and achieving rapid response. By increasing the current within the set time, the duration of high torque can be accurately controlled to avoid long-term overload operation of the motor, and the motor can be prevented from running in an overload state for a long time, thereby reducing the risk of overheating and damage.

[0038] Furthermore, the present invention sets a temperature threshold and adopts different control strategies according to the different temperatures of the drive motor and the controller; through effective temperature control and torque limitation, the frequency of frequent maintenance of the equipment due to overheating can be reduced, and maintenance costs and downtime can be reduced. Stable operating conditions make it easier to diagnose and repair equipment faults, reducing complex fault problems caused by equipment overheating. By automatically limiting the torque to adapt to different working conditions, the equipment can operate safely within a wider temperature range. Automatically adjusting the torque when the ambient temperature fluctuates or the load changes can improve the flexibility and adaptability of the system.

[0039] Furthermore, if the temperature of the drive motor and its controller exceeds the first threshold temperature but does not exceed the second threshold temperature, the output torque of the drive motor will be slowly reduced to below the output torque value corresponding to the first threshold temperature. This can effectively protect the equipment, avoid damage caused by overheating and too fast torque reduction operations, improve system stability, and optimize the overall operation effect. This method can not only extend the life of the equipment, but also improve safety, reduce maintenance requirements, and improve the system's adaptability. It is an effective temperature management strategy.

[0040] Furthermore, the present invention proposes a limiting function for the adjustment size of the output torque. By setting the limiting function, the output torque can be accurately controlled and the operating performance and efficiency of the equipment can be optimized; by setting the limiting function, it can be ensured that the equipment operates under specified working conditions and meets industry standards and specifications; at the same time, excessive adjustment of the equipment can be avoided, thereby preventing the equipment from being damaged due to excessive parameter changes. Controlling the adjustment amount helps to reduce the stress and wear of the equipment and extend the service life of the equipment; limiting the adjustment amount can prevent parameter adjustment from causing excessive fluctuations or instability of the system, keep the system running in a stable state, ensure that the adjustment amount is within a reasonable range, and help maintain the optimal performance and operating efficiency of the system; controlling the adjustment amount can avoid energy waste caused by excessive adjustment, optimize the energy efficiency of the system, and make adjustments within a reasonable range, which helps to maintain the economy of the equipment and system and reduce operating costs; setting an adjustment amount limiting function can reduce problems caused by operating errors or improper adjustments and ensure that the system operates as expected.

[0041] Furthermore, if the temperature of the drive motor and its controller exceeds the second threshold temperature, the output torque of the drive motor is reduced to a set proportional value of its peak torque and shuts down after a set time, thereby avoiding automatic shutdown due to overheating and thus avoiding production interruptions. Automatic control of temperature and load reduces the need for manual intervention by operators and improves the convenience and experience of user operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the method flow of the present invention;

[0043] Figure 2 It is a schematic diagram of the device system architecture of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0045] Example 1

[0046] like Figure 1 As shown, the present invention provides a motor water pump fault protection control method, comprising the following steps:

[0047] When the water pump is blocked, remove the jam;

[0048] If the water pump is still blocked after the jam removal is completed, control the water pump to reverse;

[0049] If the water pump is still blocked after the water pump is reversed, the water pump stall protection is executed.

[0050] Specifically, the method further includes the following steps: when the water pump is blocked, the output torque of the drive motor is adjusted according to the real-time temperature of the drive motor and its controller to prevent the temperature of the drive motor and its controller from continuously rising. The drive motor is the drive motor of the vehicle.

[0051] Specifically, the jam removal action is performed by increasing the rotational torque.

[0052] Specifically, the rotational torque is increased by increasing the operating current of the water pump motor to a set value within a set time period.

[0053] Preferably, increasing the torque of the water pump motor by temporarily increasing the current is an emergency treatment method to help solve the problem of the water pump being blocked. The following are the specific steps to perform this process:

[0054] Power-off safety check: Before operation, make sure the pump motor is powered off to avoid accidental start-up. Check whether the pump shaft can be turned manually to ensure there are no other serious mechanical faults.

[0055] Confirm the problem: Make sure that it is foreign matter in the pump that is preventing the impeller from turning, rather than a malfunction of the motor itself or severe damage to the pump.

[0056] Restore Power: Restore power to the motor, but do not start the motor yet.

[0057] Adjust the current setting: If the drive motor is connected to an adjustable controller (such as a frequency converter or soft starter), the motor's current output can be temporarily increased by adjusting the controller. Typically, the current can be set between 120%-150% of the motor's rated current to increase torque.

[0058] Start with a short increase in current: Start the motor with increased current and observe the response of the motor and pump. The increased current will cause the motor to produce more torque, which may help to unblock the pump.

[0059] Observe the rotation: If the impeller starts to rotate and the pump body gradually returns to normal operation, it means that the jam problem has been alleviated.

[0060] Return to normal settings: If the jam is resolved and the pump resumes normal operation, immediately adjust the current back to the rated value of the motor to avoid running the motor at high current for a long time.

[0061] Continue monitoring: After the motor resumes normal current, continue to monitor the motor's temperature, current and pump operation to ensure that the stall problem is completely resolved.

[0062] Preferably, the process of controlling the water pump to reverse includes:

[0063] 1. Prerequisite check

[0064] Power-off safety check: Before operation, make sure the pump motor is powered off. Check the physical condition of the motor and pump body to confirm that reverse operation can be performed safely.

[0065] Reverse feasibility: Confirm that the motor supports reverse operation. Some motor designs do not support reverse operation, and this must be confirmed first to avoid damage to the equipment.

[0066] 2. Adjust the motor controller

[0067] Change wiring (applicable to three-phase motor):

[0068] If a three-phase motor is used, reversal can be achieved by adjusting the order of the motor's power wiring, usually by swapping any two power lines (for example, swapping U and V).

[0069] Make sure this step is performed with the power off and is done by a professional to avoid electric shock or other accidents.

[0070] Controlled by frequency converter (applicable to frequency converter driven motors):

[0071] If the motor is controlled by a frequency converter, the motor reversal can be set directly on the control panel of the frequency converter.

[0072] You can usually find the "Forward / Reverse" option in the parameter settings of the inverter, and select "Reverse" or "Reverse" to start.

[0073] 3. Start the reversal operation

[0074] Short reverse run:

[0075] Start the motor and let it reverse briefly for a few seconds. During the reversal process, observe the condition of the motor and the water pump, especially listen for the sound of any foreign matter coming out.

[0076] Usually, reversing for a few seconds is sufficient. Long-term reverse operation is not recommended to avoid damaging the pump body or motor.

[0077] 4. Observe and evaluate

[0078] Check the impeller rotation:

[0079] After stopping reverse rotation, try to start the motor in the forward direction to check whether the pump resumes normal operation.

[0080] If the impeller can rotate freely and the water output returns to normal, it means that the jam problem has been solved.

[0081] Repeat the attempt:

[0082] If one reversal fails to solve the problem, you can repeat the operation once, but it is not recommended to repeat the operation multiple times to avoid damage to the equipment.

[0083] Specifically, the process of adjusting the output torque of the drive motor according to the real-time temperature of the drive motor and its controller includes: if the temperature of the drive motor and its controller does not exceed a first threshold temperature, the output torque of the drive motor is not adjusted.

[0084] Specifically, if the temperature of the drive motor and its controller exceeds the first threshold temperature but does not exceed the second threshold temperature, the output torque of the drive motor is limited to below the output torque value corresponding to the first threshold temperature. The first threshold temperature is less than the second threshold temperature. Each threshold temperature is set with its corresponding output torque value.

[0085] Specifically, the motor output torque is reduced and the rate of change of the motor output torque is limited to below a set value, so that the motor output torque reaches below the output torque value corresponding to the first threshold temperature. Since the drive motor body and the controller can run for a short period of time in this temperature range, the drive motor output torque is slowly reduced until the drive motor output torque is limited to below the output torque value corresponding to the first set threshold temperature to avoid the body temperature from continuing to rise.

[0086] Specifically, the output torque is sized to comply with the following constraint function:

[0087] ΔT=(9.55*P / n)*(t 限 / t 检 )

[0088] T 限 =T 检 -ΔT

[0089] in:

[0090] ΔT: Output torque adjustment, in Newton meters (Nm);

[0091] P: real-time power of the drive motor, in kilowatts (kW);

[0092] n: real-time speed of the drive motor, in revolutions per minute (rpm);

[0093] T 限 : Output torque value corresponding to the first threshold temperature, in Newton meters (Nm);

[0094] T 检 : The limit torque corresponding to the detected temperature of the drive motor and its controller, in Newton meters (Nm);

[0095] t 限 : first threshold temperature, unit Kelvin (k);

[0096] t 检 : The detected temperature of the drive motor and its controller, in Kelvin (K).

[0097] Specifically, if the temperature of the drive motor and its controller exceeds the second threshold temperature, the output torque of the drive motor is reduced to a set ratio of its peak torque and shuts down after a set time. In this specific implementation, if the temperature exceeds the second set threshold temperature, the output torque is directly reduced to 1 / 5 of the peak torque and shuts down after running for ten minutes to avoid the body temperature from continuing to rise and causing damage.

[0098] Specifically, temperature sensors are used to collect the temperature values ​​of the drive motor and the drive motor controller in real time; corresponding limit values ​​are set for the drive motor and the drive motor controller, respectively; the temperature value with a smaller difference between the two temperature values ​​and the corresponding limit values ​​is taken as the temperature of the drive motor and its controller, which is used for comparison between the first threshold temperature and the second threshold temperature.

[0099] Example 2

[0100] The present invention also provides a motor water pump fault protection control device, comprising a water pump protection action module and a temperature protection module; wherein:

[0101] The water pump protection working module is used to perform the jam removal work when the water pump is blocked; if the water pump is still blocked after the jam removal work is completed, the water pump is controlled to reverse; if the water pump is still blocked after the water pump is reversed, the water pump stop protection is performed;

[0102] The temperature protection module is used to adjust the output torque of the drive motor according to the real-time temperature of the drive motor and its controller when the water pump is blocked, so as to prevent the temperature of the drive motor and its controller from continuing to rise.

[0103] Example 3

[0104] The present invention also provides a vehicle, wherein the central control unit of the vehicle is used to execute the steps of the motor water pump fault protection control method as described in the above technical solution.

[0105] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0106] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0107] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0108] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0109] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

[0110] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A motor water pump fault protection control method, characterized in that: The following steps are involved: When the water pump is stuck, the jam removal work is performed; if the water pump is still stuck after the jam removal work is completed, the water pump is controlled to reverse; if the water pump is still stuck after the water pump is reversed, the water pump stop protection is performed. At the same time, the output torque of the drive motor is adjusted according to the real-time temperature of the drive motor and its controller to avoid continuous increase in the temperature of the drive motor and its controller.

2. A motor water pump fault protection control method according to claim 1, characterized in that: The card removal action is performed by increasing the rotational torque.

3. A motor water pump fault protection control method according to claim 2, characterized in that: The torque is increased by increasing the operating current of the water pump motor to a set value within a set time period.

4. A motor water pump fault protection control method according to claim 3, characterized in that: The process of adjusting the output torque of the drive motor according to the real-time temperature of the drive motor and its controller includes: if the temperature of the drive motor and its controller does not exceed a first threshold temperature, then the output torque of the drive motor is not adjusted.

5. A motor water pump fault protection control method according to claim 3, characterized in that: If the temperature of the drive motor and its controller exceeds the first threshold temperature but does not exceed the second threshold temperature, the output torque of the drive motor is limited to below the output torque value corresponding to the first threshold temperature.

6. A motor water pump fault protection control method according to claim 5, characterized in that: By reducing the output torque of the driving motor and limiting the change rate of the motor output torque to below a set value, the output torque of the driving motor is made to be below the output torque value corresponding to the first threshold temperature.

7. A motor water pump fault protection control method according to claim 6, characterized in that: The output torque is sized according to the following limiting function: ΔT=(9.55*P / n)*(t 限 / t 检 ) T 限 =T 检 -ΔT in: ΔT: Output torque adjustment, in Newton meters (Nm); P: real-time power of the drive motor, in kilowatts (kW); n: real-time speed of the drive motor, in revolutions per minute (rpm); T 限 : Output torque value corresponding to the first threshold temperature, in Newton meters (Nm); T 检 : The limit torque corresponding to the detected temperature of the drive motor and its controller, in Newton meters (Nm); t 限 : first threshold temperature, unit Kelvin (k); t 检 : The detected temperature of the drive motor and its controller, in Kelvin (K).

8. A motor water pump fault protection control method according to claim 6, characterized in that: If the temperature of the drive motor and its controller exceeds a second threshold temperature, the output torque of the drive motor is reduced to a set proportional value of its peak torque and the motor is shut down after a set time.

9. A motor water pump fault protection control method according to claim 6, characterized in that: Temperature sensors are used to collect the temperature values ​​of the drive motor and the drive motor controller in real time; corresponding limit values ​​are set for the drive motor and the drive motor controller respectively; the temperature value with a smaller difference between the two temperature values ​​and the corresponding limit values ​​is taken as the temperature of the drive motor and its controller, which is used for comparison between the first threshold temperature and the second threshold temperature.

10. A motor water pump fault protection control device, characterized in that: It includes a water pump protection action module and a temperature protection module; wherein: The water pump protection working module is used to perform the jam removal work when the water pump is blocked; if the water pump is still blocked after the jam removal work is completed, the water pump is controlled to reverse; if the water pump is still blocked after the water pump is reversed, the water pump stop protection is performed; The temperature protection module is used to adjust the output torque of the drive motor according to the real-time temperature of the drive motor and its controller when the water pump is blocked, so as to prevent the temperature of the drive motor and its controller from continuing to rise.

11. A vehicle, characterized in that: The central control unit of the vehicle is used to execute the steps of the motor water pump fault protection control method as described in any one of claims 1-9.

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