An electronic water pump control method, device, equipment, medium and vehicle

Abstract

This invention provides an electronic water pump control method, device, equipment, medium, and vehicle, relating to the field of vehicle assembly technology. The method includes: before adding coolant, determining whether a working request command for the electronic water pump has been received; if no working request command is received, controlling the electronic water pump to run at a first speed; if a working request command is received and the electronic water pump is detected to be idling, controlling the electronic water pump to run at a second speed, thereby avoiding wear, jamming, or even damage caused by dry friction when the electronic water pump is idling without coolant.

Description

Technical Field

[0001] This invention relates to the field of vehicle assembly technology, and more specifically, to an electronic water pump control method, device, equipment, medium, and vehicle. Background Technology

[0002] The electric water pump is an important component of the cooling system of new energy vehicles, used to drive the circulation of coolant to dissipate heat from high-voltage components such as the power battery, drive motor, and charger. When the electric water pump leaves the factory, a small amount of coolant is sprayed between the motor shaft and bearings. Over time, this small amount of coolant evaporates, resulting in a semi-dry or completely dry environment inside the electric water pump.

[0003] During vehicle production and assembly, before adding coolant, the electric water pump may operate in a semi-dry or completely dry environment due to the heat dissipation requirements of high-pressure components or external interference and accidental triggering. This can lead to problems such as overheating, abnormal wear, jamming, or even damage to the electric water pump, reducing its service life and affecting the reliability of the cooling system after the vehicle rolls off the production line. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an electronic water pump control method, device, equipment, medium and vehicle to improve the service life of the electronic water pump.

[0005] In a first aspect, this application provides an electronic water pump control method, comprising: During the vehicle assembly phase, before adding coolant, the electronic water pump is controlled to be in assembly protection mode. In assembly protection mode, the electronic water pump is controlled to run at a first speed; where the first speed is a pre-calibrated safe speed that ensures stable operation of the electronic water pump before adding coolant.

[0006] Optionally, during the operation of the electric water pump at the first rotational speed, the following is also included: If a work request is received for the electric water pump, the required speed is not responded to, and the electric water pump is kept running at the first speed.

[0007] Optionally, during the operation of the electric water pump at the first rotational speed, the following is also included: If the electronic water pump is detected to be running idle, the electronic water pump will be switched to the idle protection mode. In the idling protection mode, the electronic water pump is controlled to run at a second speed; the second speed is a pre-calibrated safe speed that allows the electronic water pump to run stably in the idling state; the second speed is not higher than the first speed.

[0008] Optionally, the electronic water pump control method provided in this application further includes: In idling protection mode, if a work request for the electronic water pump is received, the required speed of the work request will not be responded to, and the electronic water pump will continue to run at the second speed.

[0009] Optionally, if it is detected that the electric water pump is running idle, the method further includes: Obtain the number of times the electronic water pump runs dry; When the number of idle cycles reaches the first threshold, the electronic water pump is controlled to stop running.

[0010] Optionally, after obtaining the number of idling cycles of the electric water pump, the method also includes: When the number of idle cycles reaches the second threshold, an idle fault is reported to the vehicle controller, so that the vehicle controller outputs an idle fault prompt; wherein, the second threshold is less than the first threshold.

[0011] Optionally, the electronic water pump control method provided in this application further includes: During the operation of the electronic water pump at the second speed, the electronic water pump is periodically restarted; If the electronic water pump is detected to be still idling after each restart and the number of restarts reaches the third threshold, the electronic water pump will be stopped.

[0012] Optionally, the electronic water pump control method provided in this application further includes: After each restart of the electronic water pump, if it is detected that the electronic water pump has exited the idling state, the electronic water pump will be controlled to return to the assembly protection mode.

[0013] Optionally, the electronic water pump control method provided in this application further includes: During the operation of the electronic water pump at the second speed, monitor the idling time of the electronic water pump; If the idling time is detected to reach the fourth threshold, the electronic water pump will be stopped.

[0014] Optionally, after the electronic water pump stops operating, the following steps are also included: In response to a command to recharge the vehicle battery or clear a fault code, the electronic water pump is controlled to return to the assembly protection mode.

[0015] Secondly, this application provides an electronic water pump control device, comprising: The mode control module is used to control the electronic water pump to be in assembly protection mode before adding coolant during the vehicle assembly stage. The speed control module is used to control the electric water pump to operate at a first speed in the assembly protection mode; wherein the first speed is a pre-calibrated safe speed that allows the electric water pump to operate stably before adding coolant.

[0016] Thirdly, this application provides a vehicle including the aforementioned electronic water pump control device.

[0017] Fourthly, this application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described electronic water pump control method.

[0018] Fifthly, this application provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the above-described electronic water pump control method.

[0019] The present invention provides an electronic water pump control method, device, equipment, medium, and vehicle. Before adding coolant, it determines whether a working request command for the electronic water pump has been received. If no working request command is received, the electronic water pump is controlled to run at a first speed. If a working request command is received and the electronic water pump is detected to be idling, the electronic water pump is controlled to run at a second speed. This avoids wear, jamming, or even damage caused by dry friction when the electronic water pump is idling without coolant.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram showing the arrangement of the electronic water pump provided in an embodiment of the present invention in a vehicle is shown; Figure 2 A flowchart of the vehicle assembly line provided in an embodiment of the present invention is shown; Figure 3 A flowchart of an electronic water pump control method provided by an embodiment of the present invention is shown; Figure 4 A schematic diagram of the structure of an electronic water pump control device provided in an embodiment of the present invention is shown; Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present invention is shown. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] To facilitate a better understanding of this application by those skilled in the art, the application scenarios and design concepts of the embodiments of this application are briefly introduced.

[0025] In the vehicle assembly line, before the vehicle is fully assembled and before coolant is added, when the vehicle undergoes a high-voltage operation (i.e., the high-voltage system is connected and the power battery supplies power to the high-voltage components), the three-electric system (battery, motor, and electronic control) generates a heat dissipation demand. The vehicle controller sends a working request to the electric water pump based on this demand. Because the electric water pump has no coolant inside (especially after long-term storage where the trace amount of coolant has evaporated, leaving it in a completely dry state), prolonged idling can cause the motor shaft to overheat and wear on the bearings, leading to a stall fault. After reporting a fault code, the pump will malfunction.

[0026] Under normal operating conditions with coolant already added, such as Figure 1 The diagram shows the layout of the electric water pump in the vehicle. The electric water pump is located in the cryogenic cooling system circuit, providing power to the entire cryogenic cooling system. The electric water pump delivers coolant to the motor controller, the combined charging and DC / DC unit (CDU), and the rear drive motor, among other heat dissipation components. After passing through the heat dissipation components, the coolant is heated and then flows through the cryogenic radiator assembly, where it exchanges heat with the outside air under the blowing of the cooling fan assembly, achieving cooling. This closed-loop system maintains critical components in a comfortable operating environment, extending their service life. The expansion tank is responsible for timely replenishment of coolant and venting air from the system, improving heat exchange efficiency.

[0027] However, during the assembly process before coolant is added, the specific vehicle assembly line, such as... Figure 2 As shown, taking a certain production plant as an example, there is no need for high voltage before the battery installation station (defined as n) after the vehicle is put on the production line. Afterwards, multiple stations require high voltage and request the electric water pump to operate: Workstation 1: n+3 chair installation workstations, apply high pressure for 1.5 minutes; Workstation 2: n+4 steering wheel installation workstation, apply high pressure for 1 minute; Station 3: n+7 Vehicle brake fluid filling station, apply high pressure for 2 minutes; Workstation 4: n+16 Vehicle function inspection workstation (such as air conditioning, lights), apply high pressure for 2 minutes; Station 5: n+27 Vehicle ECU flashing station, apply high voltage for 3 minutes; Workstation 6: n+30 Vehicle coolant filling station.

[0028] The total high-pressure time during the entire assembly process is 9.5 minutes. During this period, the CDU starts working and generates a cooling request. The vehicle controller sends a working command to the electric water pump according to the CDU's temperature requirements. The electric water pump generally operates at four levels: 25%, 45%, 75%, and 95%.

[0029] For electric water pumps, the time from supplier production to final assembly should be controlled within 3 months (especially during the hot summer). If the storage time is too long, the trace amount of coolant remaining inside the electric water pump will completely evaporate, leaving it in a completely dry state. Driving the electric water pump in this state will cause irreversible dry friction wear on the pump's bearings within 5 minutes, leading to serious problems such as weak acceleration, limited torque, and instrument malfunction lights illuminating during dynamic road tests after the vehicle rolls off the production line.

[0030] Therefore, in this embodiment, before adding coolant, it is determined whether a working request command for the electronic water pump has been received; if no working request command is received, the electronic water pump is controlled to run at the lowest speed; if a working request command is received and the electronic water pump is detected to be idling, the electronic water pump is controlled to run at a safe speed, thereby avoiding wear, jamming or even damage caused by dry friction when the electronic water pump is idling without coolant, and improving the reliability of the electronic water pump and the vehicle assembly.

[0031] After introducing the application scenarios and design concepts of the embodiments of this application, the technical solutions provided by the embodiments of this application will be described in detail below.

[0032] To prevent wear, jamming, or even damage caused by dry friction when an electronic water pump runs dry without coolant, this application provides an electronic water pump control method, see below. Figure 3 The electronic water pump control method provided in this application includes at least the following steps: Step 110: During the vehicle assembly stage, before adding coolant, control the electronic water pump to be in assembly protection mode.

[0033] In this embodiment, the assembly protection mode refers to a special operating state that the control unit (MCU) inside the electric water pump enters during the assembly stage before the vehicle has completed the coolant filling. The assembly protection mode can be activated by the vehicle control unit (VCU) sending a mode switching command to the electric water pump via the communication bus when it detects that the vehicle is still in the assembly stage and has not been filled with coolant. Alternatively, the electric water pump itself can be actively triggered based on a preset assembly stage indicator.

[0034] Step 120: In assembly protection mode, control the electronic water pump to run at a first speed; wherein, the first speed is a pre-calibrated safe speed that allows the electronic water pump to run stably before adding coolant.

[0035] In this embodiment, the first rotational speed is a safe rotational speed value calibrated through extensive bench durability tests and thermal balance simulation analysis. The calibration process is as follows: The electric water pump is placed in an environment completely free of coolant and with its interior in a dry state. The electric water pump is run continuously, while parameters such as the temperature of the contact surface between the motor shaft and the bearing, the drive current of the motor, and the vibration and noise of the water pump are monitored. By gradually changing the operating speed of the electric water pump, the temperature rise rate and final equilibrium temperature of key components at different speeds are recorded. When the speed is high, the heat generated by friction is significantly greater than the heat dissipation through the water pump housing and internal air, and the temperature continues to rise until it exceeds the tolerance limit of the bearing lubricating material or the motor winding insulation material. When the speed is too low, although the heat generated is small, it may not be able to maintain the stable operation of the motor or meet the basic requirements for subsequent identification of the idling state. Therefore, within the rotational speed range where heat generation and dissipation reach a dynamic balance and the temperature of each component is always below the safe upper limit, a rotational speed value that can both ensure the continuous and stable operation of the electric water pump and minimize mechanical wear is selected as the first rotational speed.

[0036] The initial rotational speed is pre-written into the non-volatile memory of the control unit inside the electric water pump. When the electric water pump is in assembly protection mode, the control unit reads the initial rotational speed and generates a corresponding drive signal, which controls the motor of the electric water pump to rotate at the initial rotational speed through the drive circuit.

[0037] By operating at its initial speed, the electric water pump maintains a low and stable operation throughout the entire assembly phase without coolant, preventing cold welding or adhesion of the lubricating coating between the bearings and motor shaft due to prolonged compression while stationary. Furthermore, in the event of accidental minor heat generation, slow rotation ensures uniform heat dissipation, minimizing frictional heat generated per unit time. This heat is rapidly conducted to the surrounding air through the pump's metal casing, preventing heat accumulation within the motor shaft or bearings. The critical friction pairs within the electric water pump remain in a controllable thermal equilibrium, completely avoiding irreversible damage such as bearing wear, journal burning, or lubrication failure caused by high temperatures. Because the electric water pump operates at its initial speed in assembly protection mode, after coolant is added, it can smoothly transition from low speed to normal liquid-loaded operation in a short time, without the shock of starting from complete stillness, further improving the pump's start-up smoothness and long-term reliability.

[0038] By controlling the operation at the first speed in assembly protection mode, the electric water pump is provided with a minimum self-protection capability in the harsh environment without coolant, while ensuring the mechanical integrity of the water pump throughout the entire assembly line process. This significantly reduces the scrap rate of parts and the vehicle rework rate caused by idling damage during the assembly stage.

[0039] In one alternative embodiment, while the electronic water pump is operating at a first speed, the method further includes: if a work request for the electronic water pump is received, then not responding to the required speed of the work request, so that the electronic water pump continues to operate at the first speed.

[0040] In this embodiment, on the vehicle assembly line, after the vehicle is powered on at high voltage, the vehicle controller determines whether heat dissipation is needed for the relevant components based on the real-time temperature detection results of each high-voltage component. If the temperature of components such as fast / slow charging and voltage regulator transformers, motor controllers, or drive motors exceeds a preset heat dissipation activation threshold, the vehicle controller generates a working request for the electric water pump and sends the working request to the electric water pump via the vehicle's communication bus. The working request typically includes a target speed value, i.e., the required speed, which is dynamically calculated based on the intensity of the current heat dissipation demand. The value of the required speed is often much higher than the first speed used by the electric water pump in assembly protection mode.

[0041] The control unit inside the electric water pump continuously monitors messages on the vehicle's communication bus via a communication interface. When the control unit receives a work request from the vehicle controller, it does not directly parse and execute the required speed command in the work request. Instead, the control unit first identifies the current operating mode of the electric water pump. When the operating mode is in assembly protection mode, the control unit continues to maintain the original speed control command, that is, maintains the drive circuit outputting the drive voltage and drive frequency corresponding to the first speed, so that the electric water pump motor rotates continuously and stably at the first speed. Throughout the entire process, regardless of whether the required speed in the work request issued by the vehicle controller is high or low, and regardless of the duration of the work request, the actual operating speed of the electric water pump is always at the first speed, without any instantaneous acceleration or speed fluctuations.

[0042] By employing a control method that ignores the required rotational speed of work requests and maintains operation at a primary rotational speed, effective isolation between the vehicle control layer and the water pump execution layer is achieved during the assembly phase. The vehicle controller continues to issue work requests according to normal heat dissipation logic, requiring no modification to the vehicle controller software, thus maintaining the universality of the vehicle control software and the stability of the original production line process. In this embodiment, the electronic water pump, acting as an actuator, actively shields the work request through its internal assembly protection mode when it receives a high-speed operation request that could potentially damage itself, avoiding dry-running damage caused by responding to high-speed commands under incorrect operating conditions. Simultaneously, since the electronic water pump always operates at the primary rotational speed, which is pre-calibrated to ensure long-term operation in a dry environment without overheating or wear, the safety of the electronic water pump is fully guaranteed even if the vehicle controller continuously issues requests. Furthermore, maintaining a stable initial speed is beneficial for the electric water pump to quickly respond to normal operating requests after subsequent coolant addition. Since the pump motor is constantly rotating, there is no need to experience the delay from standstill to startup, thereby improving the response speed of the cooling system to enter normal operating conditions. This protects the electric water pump from damage caused by external requests during the assembly phase without requiring changes to the overall vehicle control strategy and production line process, achieving a balance between system compatibility and component safety.

[0043] In one optional embodiment, during the operation of the electronic water pump at the first speed, the method further includes: if it is detected that the electronic water pump is in an idling state, controlling the electronic water pump to switch to an idling protection mode; in the idling protection mode, controlling the electronic water pump to operate at a second speed; wherein the second speed is a pre-calibrated safe speed that allows the electronic water pump to operate stably in an idling state; the second speed is not higher than the first speed.

[0044] In this embodiment, the control unit inside the electronic water pump continuously monitors operating parameters reflecting the pump's load status while the drive motor operates at a first speed. Idle state refers to a state where the pump chamber lacks coolant, the impeller rotates in the air, and the fluid resistance is much lower than in the normal liquid-filled state. The control unit can determine whether the electronic water pump is in an idle state by collecting parameters such as the motor's drive current or power. For example, when the pump is full of coolant, the impeller needs to overcome significant liquid resistance to rotate, resulting in a larger motor output torque and a correspondingly higher drive current; conversely, when there is no coolant in the pump chamber, the resistance on the impeller is significantly reduced, the motor load is lighter, and the drive current decreases significantly. The control unit pre-stores an idle current threshold or an idle power threshold, which is determined through bench testing. Specifically, this threshold is determined by measuring the drive current or power of the electronic water pump when it is completely dry and running stably at the first speed, taking into account a certain error margin. The control unit acquires the current drive current value in real time and compares it with the idling current threshold. If the current drive current value is continuously lower than the idling current threshold and the duration exceeds the preset anti-false judgment time window, the electronic water pump is determined to be in an idling state.

[0045] Once the electric water pump is determined to be idling, the control unit performs a mode switching operation, switching the electric water pump from the current assembly protection mode to the idling protection mode. The idling protection mode is a special operating mode designed for the electric water pump to operate in an environment without coolant. Its core purpose is to further reduce the operating speed after confirming that the electric water pump is idling, so as to minimize frictional heat generation and mechanical wear.

[0046] In the idling protection mode, the control unit controls the electric water pump to operate at a second speed. This second speed is a pre-calibrated safe speed value, calibrated similarly to the first speed, but under the extreme condition of the electric water pump being completely dry and continuously idling, a minimum reliable speed is determined through testing to ensure long-term stable operation without thermal or mechanical damage. The second speed is typically lower than the first speed because the first speed is a preventative safe speed before idling is confirmed, while the second speed is a reactive limit safe speed after idling is confirmed. The second speed is pre-written into the control unit's non-volatile memory. After switching to the idling protection mode, the control unit reads the second speed and generates a corresponding drive signal, gradually reducing the electric water pump motor's current speed from the first speed to the second speed via the drive circuit. Since the second speed is not higher than the first speed and is usually lower, the motor speed decreases further, and the relative sliding speed between the motor shaft and bearings also decreases further. In idling protection mode, the electric water pump continuously operates at the second speed. At this time, the impeller rotates in the air, the motor load is extremely light, and the drive current is lower than when operating at the first speed. As the rotational speed decreases, the heat generated by the friction pair per unit time is further reduced, while the heat can still be effectively dissipated through the pump housing, ensuring that the internal temperature of the electronic water pump remains within a safe range. By identifying the idling state and switching to the idling protection mode to operate at the second rotational speed, the control method achieves refined management and hierarchical protection of the electronic water pump's operating status. During the first speed operation, the electric water pump operates in a preventative low-speed state. While it can handle general external requests, it hasn't yet confirmed whether there is a coolant shortage. Accurately identifying the idling state through current monitoring triggers a higher level of protection: switching to idling protection mode and reducing the speed to a lower second speed. This avoids prematurely limiting the speed before idling occurs, which could affect normal heat dissipation response, and quickly brings the pump into the safest operating range after idling is confirmed. This allows the electric water pump to operate for extended periods in a completely dry environment with extremely low mechanical wear. The contact pressure and sliding speed between the motor shaft and bearings are controlled close to the critical level of static friction, minimizing dry friction damage. Furthermore, since the second speed is a strictly calibrated stable operating speed, the electric water pump will not vibrate, lose synchronization, or stop due to excessively low speed, ensuring the pump remains in a controllable operating state throughout the assembly process. In addition, the operation of the electronic water pump in the idling protection mode provides a clear logical premise for subsequent fault reporting or shutdown protection. That is, only when the electronic water pump is already in the idling protection mode and continues to receive external requests or the idling time is too long, it is necessary to perform more severe protection actions such as shutdown. This achieves a good balance between protecting the electronic water pump and maintaining the continuity of the assembly process.

[0047] In this way, even if the electric water pump enters an idling state due to various reasons during the assembly process without coolant, it can automatically switch to the idling protection mode and run at the second speed. This effectively avoids bearing dry friction, jamming and damage caused by high-speed idling or long-term idling, and significantly improves the survivability of the electric water pump under harsh working conditions and the reliability of the vehicle assembly.

[0048] In an alternative embodiment, in the idling protection mode, if a working request for the electric water pump is received, the required speed of the working request is not responded to, and the electric water pump is kept running at a second speed.

[0049] In this embodiment, when the electronic water pump is in the idling protection mode and is running stably at the second speed, the control unit inside the electronic water pump continuously listens for the work request messages sent by the vehicle controller on the vehicle communication bus through the communication interface.

[0050] During the vehicle assembly line process, the vehicle controller periodically sends operating requests to the electric water pump, either directly or based on temperature detection results. Upon receiving a working request, the control unit actively discards or ignores the required speed data within the request, preventing it from being sent to the motor drive control circuit. Simultaneously, the control unit maintains the original speed control command, ensuring the drive circuit outputs the drive voltage and frequency corresponding to the second speed, thus ensuring the electric water pump motor rotates strictly according to the second speed. Throughout this process, regardless of the frequency at which the vehicle controller sends operating requests or the magnitude of the required speed value in the requests, the actual operating speed of the electric water pump remains consistently at the second speed, without any acceleration response or speed fluctuations.

[0051] By employing the aforementioned control method of not responding to work requests at the required speed and maintaining operation at the second speed, inappropriate speed requests from the vehicle controller are completely isolated even under harsh conditions where the electronic water pump is confirmed to be idling. The vehicle controller does not need to be aware of the internal state of the electronic water pump; its cooling request logic can remain universal and independent, without affecting the normal execution of other vehicle functions. As an actuator, the electronic water pump actively shields itself from all high-speed operation commands that could potentially damage it in the idling protection mode, ensuring that the pump always operates within the safest speed range. This avoids serious consequences such as increased bearing dry friction, rapid temperature rise, or even pump jamming and failure caused by externally requested forced speed increases. Meanwhile, since the electronic water pump maintains a stable second speed, it will not generate additional current surges or mechanical shocks due to sudden acceleration or frequent speed adjustments. This further extends the continuous operating time of the electronic water pump in a coolant-free environment. Even when faced with continuous and high-intensity external work requests during the assembly stage, the electronic water pump can adhere to its own safety protection logic, thus providing sufficient buffer time for production line operators or subsequent testing processes. Necessary inspections or waiting for coolant to be added can be completed without damaging the water pump.

[0052] In summary, by refusing to respond to external work requests at the required speed and insisting on operating at the second speed in the idling protection mode, the core mechanical components of the electronic water pump are protected from fatal damage, while maintaining the normal communication and working order of the vehicle control system. This achieves a balance between active safety protection and system compatibility under extreme conditions during the assembly stage.

[0053] In one optional embodiment, if the electronic water pump is detected to be in an idling state, the method further includes: acquiring the number of times the electronic water pump has run idling; and controlling the electronic water pump to stop running when the number of idling times reaches a first threshold.

[0054] In this embodiment, the control unit inside the electronic water pump records the number of idling events after detecting that the electronic water pump is in an idling state. The number of idling events refers to the cumulative number of events since the electronic water pump entered the assembly protection mode, when it was identified as being in an idling state and entered the idling protection mode.

[0055] The control unit has an internal non-volatile counter to record the number of idling events. Each time the control unit determines that the electric water pump has entered an idling state and performs a tooling mode switch and speed adjustment, the counter automatically increments by one. It should be noted that if the electric water pump is in a continuous idling state for an extended period, as long as it does not exit and re-enter the idling protection mode, it is usually counted as only one idling event. If the electric water pump is identified as idling again after exiting the idling protection mode, a new idling count is accumulated.

[0056] The counter continuously records the number of idle cycles. A first threshold is pre-stored in the control unit. This first threshold is a safety limit determined through durability testing and statistical analysis, characterizing the maximum permissible number of intermittent idle events the electric water pump can withstand without irreversible mechanical damage. The first threshold is calibrated based on the following considerations: each idle event causes a certain degree of wear to the lubrication coating or friction pair surface between the motor shaft and bearings inside the electric water pump. Although the dry wear rate is low at the second speed, the accumulated wear will gradually approach the critical value. The specific value of the first threshold is determined comprehensively based on the design life of the electric water pump, the wear resistance of the lubricating material, and the expected idle risk during the assembly stage; for example, it can be set to three or five times.

[0057] After identifying and counting each idling event, the control unit compares the current cumulative number of idling cycles with a first threshold. If the cumulative number of idling cycles has not yet reached the first threshold, the electric water pump continues to operate at a second speed in idling protection mode and can respond to subsequent exit conditions or recovery commands. When the control unit detects that the cumulative number of idling cycles has reached the first threshold, it determines that the electric water pump has endured a sufficient number of dry-running cycles, and the accumulated wear of its internal friction pairs is approaching or has reached the safety limit. Continuing operation may result in permanent damage such as bearing jamming, severe journal wear, or rotor seizure. At this point, the control unit executes a shutdown protection operation, i.e., cutting off the drive current of the electric water pump motor, causing the motor to stop rotating. The control unit can achieve shutdown by turning off the power switch of the drive circuit, disconnecting the motor coil from the power supply, or applying a braking signal. After the electric water pump stops running, the impeller stops rotating, and the relative movement between the motor shaft and the bearing completely stops, thus completely avoiding further mechanical wear and heat generation. At the same time, the control unit stores the shutdown fault information and reports it to the vehicle controller via the communication bus so that the production line testing equipment can read the fault code and remind the operator that the electric water pump needs to be repaired or replaced because the number of idling cycles has exceeded the limit.

[0058] By acquiring the number of idle cycles and controlling the electronic water pump to stop operating when a first threshold is reached, a quantitative protection mechanism based on cumulative damage life is provided for the electronic water pump during the assembly stage. This effectively addresses the multiple, intermittent idle events that the electronic water pump may experience during assembly, ensuring that the total idle damage of the electronic water pump during the entire assembly stage is strictly controlled within the design allowable range. Once it exceeds this range, the pump is immediately shut down, thus completely avoiding the risk of premature failure of the water pump shortly after the vehicle rolls off the production line due to excessive cumulative wear. This significantly improves the survivability and reliability of the electronic water pump in complex assembly environments, effectively extends the total service life of the electronic water pump, and reduces the risk of hidden and cumulative damage to the vehicle assembly line caused by repeated idle cycles of the water pump.

[0059] In one optional embodiment, after obtaining the number of idling cycles of the electronic water pump, the method further includes: when the number of idling cycles reaches a second threshold, reporting an idling fault to the vehicle controller so that the vehicle controller outputs an idling fault prompt; wherein the second threshold is less than the first threshold.

[0060] In this embodiment, the control unit inside the electronic water pump, while recording the number of idle cycles using a counter, compares the accumulated number of idle cycles not only with a first threshold used to trigger shutdown protection, but also with a second threshold. The second threshold is pre-stored in the non-volatile memory of the control unit, and its value is less than the first threshold. The second threshold is set to issue an early warning to the vehicle control system before the electronic water pump reaches its wear limit, allowing production line operators or testing equipment to obtain the pump's status information in a timely manner and take preventative measures. For example, if the first threshold is set to three idle cycles, the second threshold can be set to one or two.

[0061] After each idling event, the control unit updates the counter value and compares it with a second threshold. When the accumulated number of idling events reaches the second threshold but not the first threshold, the control unit determines that the electric water pump has undergone initial idling wear. Although it has not yet reached the dangerous level requiring immediate shutdown, it has exceeded the expected safety range during normal assembly. At this time, the control unit sends an idling fault report to the vehicle controller via the vehicle's communication bus, such as the controller area network bus. The idling fault report may include a fault code, the number of idling events, and other relevant diagnostic information. When the vehicle controller receives the idling fault report, it parses the fault content and outputs an idling fault prompt according to a preset prompt strategy. The idling fault prompt may take the form of displaying alarm information on the production line's inspection screen, illuminating a specific fault indicator light on the instrument panel, emitting an audible alarm via a buzzer, or recording the fault information in the production management system for later retrieval.

[0062] It should be noted that when the number of idling cycles reaches the second threshold, the control unit only reports the idling fault and does not perform a shutdown operation. The electronic water pump continues to operate at the second speed in idling protection mode, or decides whether to continue operating based on other conditions, so as not to affect the continuation of the vehicle assembly process while issuing a warning, such as allowing operators to complete the current inspection process or add coolant without stopping the water pump.

[0063] By implementing the control method described above, which reports idling faults when the number of idling cycles reaches the second threshold, graded early warning and progressive protection against idling wear of the electronic water pump are achieved. The second threshold serves as a pre-warning line for the first threshold, issuing a clear fault indication to the vehicle controller before the electronic water pump suffers serious damage. This allows the quality control system on the production line to monitor the health status of each electronic water pump in real time, marking and tracking pumps that frequently idle, and arranging re-inspection, lubricant replenishment, or replacement before the electronic water pump is completely damaged. At the same time, the advance fault reporting method provides production personnel with a buffer time, reducing production line stoppages and workstation waiting caused by sudden shutdowns, and effectively preventing damaged water pumps from being installed in finished vehicles. By using graded thresholds, the electronic water pump is not overly interfered with when it is only slightly worn, and an alarm is issued in time when the wear accumulates to the warning value. This achieves a reasonable balance between ensuring the service life of the water pump and maintaining assembly efficiency. It makes the risk of idling during the assembly process visible, traceable and manageable, effectively reducing the probability of the electronic water pump being damaged due to the accumulation of wear from idling and improving the quality control level of the vehicle assembly line.

[0064] In an optional embodiment, the electronic water pump control method provided in this application further includes: periodically restarting the electronic water pump while it is running at a second speed; and after each restart, if it is detected that the electronic water pump is still in an idling state and the number of restarts of the electronic water pump reaches a third threshold, then controlling the electronic water pump to stop running.

[0065] In this embodiment, when the electronic water pump is in idling protection mode and running at the second speed, the control unit inside the electronic water pump also executes a periodic restart logic. Periodic restart refers to the control unit actively performing a short pause and then restarting of the electronic water pump motor at preset time intervals; where the preset time interval is a fixed duration, such as restarting every thirty seconds or one minute; the control unit pre-stores a third threshold, which is the maximum number of consecutive idling restarts that the electronic water pump can safely withstand under the periodic restart strategy, determined through experiments. The third threshold is set based on the fact that although each restart briefly interrupts the continuous wear of the friction pair, during the instant the motor accelerates from rest to the second speed, the shaft and bearing undergo a transition from static friction to dynamic friction. The wear generated by this transient process is slightly greater than the wear during stable operation. Therefore, the cumulative damage from multiple restarts and continued idling should be limited to a safe range.

[0066] After each restart and confirmation that the pump is still in an idling state, the control unit compares the current cumulative number of restarts with a third threshold. If the number of restarts has not yet reached the third threshold, the control unit continues to allow the electric water pump to run at the second speed and waits for the next periodic restart. When the control unit detects that the number of restarts has reached the third threshold, it determines that the electric water pump has undergone a sufficient number of restart attempts and has failed to exit the idling state after each restart, indicating that the coolant shortage still exists and the electric water pump has withstood multiple start-up shocks and continuous dry running. At this point, the control unit executes a shutdown protection operation, cutting off the drive current to the electric water pump motor, causing the motor to stop completely and preventing any further restart attempts.

[0067] By periodically restarting the electric water pump and stopping operation when the number of restarts reaches a third threshold, a dynamic self-checking and final protection mechanism is provided for the electric water pump in idling protection mode, helping to delay the aging and wear of the lubricating coating. Simultaneously, re-identifying the idling state after a restart verifies whether the idling condition still exists. If, after a restart, the idling state disappears due to coolant addition or other reasons, the control unit can exit the idling protection mode and return to normal mode or assembly protection mode, thus avoiding unnecessary downtime. Limiting the number of restarts by the third threshold prevents the electric water pump from repeatedly restarting and idling indefinitely, avoiding cumulative damage exceeding the safety limit. Once the third threshold is reached, a permanent shutdown is decisively executed, completely preventing the electric water pump from continuing to operate, thereby protecting the pump's critical mechanical components from irreversible serious damage in the worst-case scenario. In summary, by introducing periodic restarts during the operation of the electronic water pump at the second speed and stopping operation when the number of restarts reaches the third threshold, the electronic water pump is given multiple opportunities for automatic recovery while ensuring safety. At the same time, the limited number of shutdowns avoids indefinite cumulative damage, realizing intelligent and adaptive management in the idling protection mode, and further improving the survivability and reliability of the electronic water pump in harsh assembly environments.

[0068] It should be noted that, through extensive testing, the rated operating speed for the embodiments of this application is determined to be... For an electronic water pump (e.g., 6000 rpm), the first speed is calibrated between 3% and 8% of the rated speed, such as 200-500 rpm; the second speed is calibrated between 1% and 5% of the rated speed, but never exceeds the first speed, such as 50-300 rpm. Specifically, when the first speed is 300 rpm, the second speed can be calibrated to 100 rpm to ensure that, in the absence of coolant drying, frictional heat generation and heat dissipation from the casing achieve a dynamic balance, and the motor can operate stably.

[0069] In one optional embodiment, the electronic water pump control method provided in this application further includes: after each restart of the electronic water pump, if it is detected that the electronic water pump has exited the idling state, then controlling the electronic water pump to return to the assembly protection mode.

[0070] In this embodiment of the application, during the process of the electric water pump running at the second speed and performing periodic restarts, after each restart operation is completed and the motor is restarted, the control unit, in addition to identifying the idling state, also determines whether the electric water pump has exited the idling state. Exiting the idling state means that the pump chamber of the electric water pump changes from a state with no coolant or a severe shortage of coolant to a state with sufficient coolant, or the impeller load returns to the normal level due to other reasons.

[0071] The control unit collects parameters such as the motor's drive current or power in real time and compares the collected parameters with the preset idling exit threshold. If the detected drive current value is greater than or equal to the idling exit threshold and continues for a preset anti-false judgment time window, it determines that the electronic water pump has exited the idling state and immediately performs a mode recovery operation, that is, switches the current working mode from the idling protection mode back to the assembly protection mode.

[0072] By identifying the exit from the idling state and controlling the electronic water pump to return to the assembly protection mode after each restart, dynamic adaptive adjustment of the electronic water pump's operating mode is achieved. When the electronic water pump detects that coolant has been added or the idling condition has disappeared after a periodic restart, it can automatically switch from the higher protection level of the idling protection mode back to the relatively lower assembly protection mode. This allows the electronic water pump to operate at a speed closer to normal operating conditions while ensuring safety, thus preventing the electronic water pump from running at an extremely low second speed for an extended period after coolant has been added. After automatically returning to the assembly protection mode, the electronic water pump continues to execute the logic under the assembly protection mode, i.e., it does not respond to the speed requirements of external work requests, while still conforming to the overall safety strategy of the assembly stage. This prevents the electronic water pump, which has been added coolant, from entering unexpected high-speed operation before assembly is completed due to a sudden high-speed request from the vehicle controller, thus achieving operation without manual intervention. The entire process is automatically completed by the control unit of the electric water pump itself based on real-time monitoring of operating parameters, which improves the automation level and operating efficiency of the assembly line. By setting the hysteresis range between the idling entry threshold and the exit threshold, the frequent switching of modes by the electric water pump when the coolant has just been added but has not yet stabilized can be effectively avoided, ensuring the stability and reliability of the working mode. This allows the electric water pump to intelligently adjust the working mode according to the actual coolant status, providing maximum protection in the idling state and promptly restoring to the control strategy adapted to the current assembly stage after the idling is stopped. This achieves a smooth transition from harsh working conditions to normal working conditions, maximizes the service life of the electric water pump, and ensures the function of the cooling system during the vehicle assembly process.

[0073] In one optional embodiment, the electronic water pump control method provided in this application further includes: monitoring the idling time of the electronic water pump during operation at a second speed; if the idling time reaches a fourth threshold, controlling the electronic water pump to stop running.

[0074] In this embodiment, when the electronic water pump enters the idling protection mode and runs at the second speed, the duration of continuous idling by the electronic water pump is continuously monitored, i.e., the idling time. The idling time monitoring begins from the moment the electronic water pump is identified as being in an idling state, switches to the idling protection mode, and begins running at the second speed. A timer is installed inside the control unit. The timer starts the instant the control unit determines that the electronic water pump has entered the idling protection mode and continuously accumulates the time as the electronic water pump continues to run in the idling protection mode. The timer can use the control unit's internal crystal oscillator or system clock as the timing reference to ensure the accuracy of the time measurement.

[0075] During the operation of the electric water pump at the second speed, as long as the control unit does not detect a signal to exit the idling state (i.e., the electric water pump remains in idling protection mode), the timer continuously accumulates the idling time. If the electric water pump experiences a short stop due to periodic restarts, but is still identified as idling after restarting, the timer should deduct the idle time during the stop, or exclude the stop time from the idling time, only accumulating the actual time the motor is rotating. The control unit pre-stores a fourth threshold, which is a safe time limit determined through durability testing and thermal balance analysis. This threshold characterizes the maximum permissible time for the electric water pump to operate safely without irreversible mechanical or thermal damage under completely dry conditions and continuous idling at the second speed. The calibration process for the fourth threshold is as follows: In bench testing, the electric water pump is placed in a completely dry environment without coolant and continuously operated at the second speed, while continuously monitoring parameters such as the temperature of the motor shaft and bearing contact surface, the motor drive current, vibration noise, and the pump's sealing performance. Record the time elapsed from the start of operation until the bearing wear reaches the design limit, the motor temperature exceeds the maximum allowable temperature for the insulation class, or the water pump shows signs of impending jamming. Considering a certain safety margin, a percentage of this time is determined as the fourth threshold. For example, if tests show that the bearing wear approaches the critical value after the electric water pump runs continuously at the second speed in a dry state for thirty minutes, the fourth threshold can be set to twenty minutes or fifteen minutes.

[0076] During the accumulation of idling time by the timer, the control unit compares the current accumulated idling time with the fourth threshold in real time. When the accumulated idling time is less than the fourth threshold, the electric water pump continues to operate at the second speed, and the control unit does not perform a shutdown operation, while continuing to monitor the idling time and idling status. When the control unit detects that the accumulated idling time has reached or exceeded the fourth threshold, it determines that the electric water pump has been idling continuously in a dry environment for a sufficiently long time, and the accumulated wear of its internal friction pairs has approached or reached the safety limit. Even if it operates at a lower second speed, the heat and wear generated by prolonged continuous friction may cause the bearing lubrication coating to completely fail, scratches or pitting to appear on the motor shaft surface, or even permanent damage such as bearing seizure. At this time, the control unit performs a shutdown protection operation, that is, cuts off the drive current of the electric water pump motor, causing the motor to stop rotating completely.

[0077] By monitoring the idling time during the second speed operation and stopping operation when the fourth threshold is reached, the above-described control method provides a quantitative protection mechanism for the electronic water pump based on continuous operation time. This effectively identifies and prevents the risks associated with prolonged continuous idling. By monitoring the idling time during the second speed operation and stopping operation when the fourth threshold is reached, the electronic water pump achieves active protection based on time accumulation under harsh conditions without coolant. This effectively avoids bearing damage, motor overheating, and functional failure caused by prolonged continuous dry running, significantly improving the electronic water pump's resilience on the final assembly line and the reliability of vehicle assembly.

[0078] It should be noted that the shutdown protection mechanisms based on the number of idle cycles, the duration of idle cycles, and the number of periodic restarts are independent and parallel to each other. In this embodiment, the wear status of the electronic water pump is evaluated from three different dimensions: the cumulative number of damages, the duration of continuous damage, and the impact of dynamic restarts. When any condition reaches a preset safety threshold (i.e., the first, fourth, and third thresholds), it indicates that the electronic water pump is in an unacceptable risk of damage, and the control unit will unconditionally execute a shutdown operation, thereby forming a multi-dimensional and complementary electronic water pump safety protection system.

[0079] In one alternative embodiment, after the electronic water pump stops operating, the method further includes: in response to a vehicle battery power-on or fault code clearing command, controlling the electronic water pump to return to assembly protection mode.

[0080] In this embodiment, when the electronic water pump is triggered by protection conditions such as the number of idle cycles reaching a first threshold, the idle duration reaching a fourth threshold, or the number of restarts reaching a third threshold, and a shutdown operation is performed, the control unit inside the electronic water pump enters a locked state. In the locked state, the control unit cuts off the motor's drive current, keeping the motor stationary and no longer responding to any work requests from the vehicle controller. At the same time, it stores relevant fault data such as the shutdown reason, the accumulated number of idle cycles, and the idle duration in the non-volatile memory inside the control unit for subsequent diagnosis and tracing.

[0081] To protect the electric water pump while avoiding resource waste caused by permanent pump failure due to a single malfunction requiring assembly replacement, this application provides two recovery mechanisms: The first recovery mechanism responds to the vehicle battery being re-energized. During vehicle assembly, the vehicle's 12-volt or 24-volt low-voltage battery provides power to controllers such as the electric water pump. When the electric water pump enters a locked state due to a protection condition, if the operator disconnects the power supply line of the vehicle's low-voltage battery, waits a short time, and then reconnects it, the electric water pump control unit will undergo a complete hardware reset process the moment the battery is re-energized. During the reset process, the processor inside the control unit restarts, temporary data in the random access memory is cleared, the program counter is reset to zero, and all registers are restored to their initial default state. The control unit reads preset configuration parameters from non-volatile memory, including the first speed, the second speed, and various thresholds, but clears previously accumulated temporary diagnostic data such as idling counts, idling durations, and restart counts. After the reset is complete, the control unit exits the locked state and, based on the current assembly stage of the vehicle, actively sets the operating mode of the electronic water pump to assembly protection mode. In assembly protection mode, the control unit controls the electronic water pump to start running at the first speed according to preset logic. The battery re-energization recovery method requires no special tools or external equipment; it can be completed simply through a common power-off operation on the production line. It is suitable for rapid recovery scenarios where the water pump stops due to accidental protection triggering during assembly. The second recovery mechanism responds to a fault code clearing command. This command is sent by an external diagnostic device through the vehicle's standard diagnostic interface, which typically follows Controller Area Network (CAN) protocols or other vehicle communication protocols. After the electric water pump enters a locked state and stores fault codes, the operator can connect a diagnostic device to the vehicle's diagnostic interface. The diagnostic device sends a fault code clearing command conforming to the communication protocol, which is transmitted to the electric water pump's control unit via the vehicle's communication bus. Upon receiving the command, the control unit's communication interface first parses and verifies its validity, confirming that the command's source is reliable and its format is correct. After successful verification, the control unit executes the fault code clearing operation, resetting or marking all fault data recorded in the non-volatile memory, such as the cause of shutdown, number of idle cycles, and idle duration, as invalid. Simultaneously, the control unit unlocks, clears all internal accumulated counts and timing data, and restores the operating state to the default initial state. Subsequently, based on the vehicle's current assembly status, the control unit automatically switches to assembly protection mode and begins driving the electric water pump at the first speed. The fault code clearing command recovery method does not require disconnecting the vehicle's power supply. It can restore the electronic water pump independently without interrupting the operation of other controllers. It is especially suitable for scenarios in production line off-line testing processes or after-sales service stations where historical fault records need to be quickly cleared and the water pump function needs to be re-verified.

[0082] Whether the electric water pump is restored by re-energizing the vehicle battery or by clearing fault codes, all temporary data used to trigger shutdown protection, such as the cumulative number of idle runs, idle duration, and number of restarts, are cleared after it is restored to the assembly protection mode.

[0083] It's important to note that restoring the pump will not repair existing mechanical wear. If the electric water pump has suffered substantial physical damage during previous idling, there is still a risk of performance degradation or premature failure after restoration. Therefore, in practice, it is generally recommended to ensure that coolant has been added and the cause of idling has been eliminated before performing any restoration operations.

[0084] By responding to the vehicle battery power-on or fault code clearing command and controlling the electronic water pump to return to assembly protection mode, the above-mentioned control method achieves a recoverable design after the electronic water pump's protective shutdown. This avoids the complete scrapping of the electronic water pump due to abnormal triggering during a single assembly process, significantly reducing component replacement costs and resource waste. Simultaneously, the recovery mechanism provides production line operators with flexible handling methods: in emergencies, production can be quickly restored by power-off restart; in quality control scenarios, fault codes can be accurately cleared and re-inspected using diagnostic equipment. Furthermore, the recovery operation clears all accumulated temporary data, ensuring that the electronic water pump has a complete protection range each time it re-enters assembly protection mode, preventing premature shutdown due to residual historical data. This ensures both mandatory protection of the electronic water pump under abnormal operating conditions and balances production efficiency and maintenance convenience, achieving a good balance between component safety, production costs, and assembly continuity. In summary, through the above recovery mechanism, the electronic water pump can be put back into use after the cause of the malfunction has been eliminated, effectively extending its effective service life in the actual production environment, while providing a more robust and flexible quality control means for the vehicle assembly line.

[0085] In some optional embodiments, before executing the electronic water pump control method, the method further includes: obtaining the production dates of all electronic water pumps; if the date difference between the current electronic water pump's production date and the current assembly date is less than a date threshold, and the production date is earlier than the current assembly date, then assembling the current electronic water pump into the vehicle; and obtaining the production lubricating coating thickness of the electronic water pump; if the production lubricating coating thickness is less than a thickness threshold, then controlling the spraying equipment to add lubricant to the electronic water pump.

[0086] In this embodiment, before executing the electronic water pump control method, an entry screening and pre-processing operation for the electronic water pumps is also performed. Specifically, before assembling the electronic water pumps into the vehicle, the production date of each electronic water pump is obtained. The production date is recorded on the outer packaging or its own electronic tag. At the same time, the current production line assembly date is obtained, and the time difference between the production date and the current assembly date is calculated. If the time difference is less than a preset date threshold, and the production date is earlier than the current assembly date, then the current electronic water pump is determined to be a qualified part and allowed to be assembled into the vehicle. In this embodiment, the date threshold is a safety period preset based on the natural evaporation rate of the residual coolant inside the electronic water pump and the aging characteristics of the bearing lubricating material, such as three months. By screening with the date threshold, it is ensured that only electronic water pumps with a short interval between production line exit and assembly line entry are used, and electronic water pumps with a larger time difference are used first. This prevents the complete evaporation of the trace amount of internal coolant or hardening of the lubricating grease due to long-term storage, reducing the initial wear risk of the water pump running idling without coolant. Simultaneously, the thickness of the production lubricating coating of the electronic water pump is measured before assembly. This production lubricating coating is a layer of solid lubricating material pre-applied to key friction areas such as the motor shaft surface, bearing inner ring, and rotor journal during the electronic water pump manufacturing process. Its function is to provide temporary lubrication protection when coolant is temporarily unavailable. The actual thickness of this coating is measured using a thickness measuring instrument. If the measured coating thickness is less than a preset thickness threshold, it indicates that the electronic water pump's dry-run lubrication capability is insufficient. In this case, the spraying equipment on the assembly line automatically adds lubricant to the corresponding friction areas of the electronic water pump. The lubricant can be a solid lubricating material or liquid lubricating grease compatible with the original coating, added until the coating thickness recovers to above the threshold. After lubricant replenishment, the electronic water pump can proceed to the subsequent assembly process.

[0087] Through the aforementioned pre-assembly processing, this embodiment controls the quality status of the electronic water pump from the source. The production date screening mechanism eliminates old stock that has been stored for too long and whose internal coolant has evaporated, preventing the water pump from being in a completely dry state without lubrication due to a dry storage environment. The lubrication coating thickness detection and replenishment mechanism ensures that each water pump put into use has a sufficiently thick dry-running protective layer. Even if it accidentally runs dry without coolant during assembly, this coating can play a friction-reducing role in a short time, delaying the occurrence of dry-running damage. By pre-processing the electronic water pump before assembly, the failure risk of the electronic water pump itself entering the assembly line is reduced, and more reliable initial conditions are provided for subsequent assembly control methods, thereby improving the overall durability of the electronic water pump on the final assembly line and the stability of the vehicle assembly.

[0088] In one optional embodiment, before the electronic water pump control method, the method further includes: acquiring first operating parameters of the electronic water pump before adding coolant; determining that the electronic water pump is in normal operation based on the first operating parameters and a first operating threshold; and acquiring second operating parameters of the electronic water pump after adding coolant; determining that the electronic water pump is in normal operation based on the second operating parameters and a second operating threshold.

[0089] In this embodiment, the electronic water pump is functionally verified before and after adding coolant, respectively, before vehicle assembly. Specifically, before adding coolant, the first operating parameters of the electronic water pump are acquired and compared with a preset first operating threshold to determine whether the electronic water pump is in normal working condition. The first operating parameters can be no-load test data of the electronic water pump under no-coolant conditions, such as start-up response time, initial current peak value, or vibration amplitude. If the first operating parameters are within the first operating threshold range, it is determined that the electronic water pump can start normally and output basic performance without coolant, thus passing the pre-assembly inspection. After adding coolant, the second operating parameters of the electric water pump are obtained and compared with the preset second operating threshold to determine whether the electric water pump is in normal working condition under liquid conditions. The second operating parameters may be the stable current, flow output value or speed stability of the electric water pump under rated load. If the second operating parameters are within the second operating threshold range, it is determined that the electric water pump can meet the flow and pressure requirements of the vehicle's cooling system in a coolant-filled environment, thus passing the final assembly acceptance.

[0090] Further, after the functional verification of the electric water pump, a special no-load durability test is also carried out on the electric water pump. Specifically, during the test, the electric water pump is in a waterless state, the ambient temperature is controlled within the standard room temperature range, and the rated test voltage is applied; during the test process, the running noise of the electric water pump is obtained to ensure that the running noise is within an acceptable range. Among them, for an electric water pump that is not completely dry, that is, in a state where there is still a small amount of residual moisture inside, it runs continuously for one hour or continues to run until the electric water pump enters the no-load protection state. During this process, the running state of the water pump is obtained regularly; for a completely dry electric water pump, that is, in a pure dry state where there is no visible residual liquid inside, it runs continuously for fifteen minutes. During the entire test period, the electric water pump shall not show obvious jamming or accidental stoppage. After the test, a sealing test and a flow performance test are also required for the electric water pump. Only when the results of both the sealing test and the flow performance test meet the preset performance index requirements, it is determined that the electric water pump assembly is qualified, so as to ensure that the electric water pump has passed a strict no-load tolerance assessment before entering the vehicle assembly line, thereby reducing the risk of premature failure due to individual differences after mass loading. At the same time, the two running parameter detections before and after adding the coolant not only verify the basic function of the electric water pump in the liquid-free state but also verify its heat dissipation performance in the state with coolant, forming a complete quality closed-loop control to improve the qualification rate of the electric water pump on the vehicle final assembly line and the long-term reliability of the vehicle.

[0091] The embodiment of the present application also provides an electric water pump control device. Refer to Figure 4 As shown, the electric water pump control device provided by the embodiment of the present application includes: A mode control module 410, configured to control the electric water pump to be in an assembly protection mode before adding coolant during the vehicle assembly stage; A speed control module 420, configured to control the electric water pump to run at a first speed in the assembly protection mode; wherein, the first speed is a pre-calibrated safe speed for the stable operation of the electric water pump before adding coolant.

[0092] It should be noted that the principle of the electric water pump control device provided by the embodiment of the present application to solve technical problems is similar to that of the electric water pump control method provided by the embodiment of the present application. Therefore, for the implementation of the electric water pump control device provided by the embodiment of the present application, reference can be made to the implementation of the electric water pump control method provided by the embodiment of the present application, and the repeated parts will not be elaborated.

[0093] After introducing the electric water pump control method and device provided by the embodiment of the present application, next, a brief introduction to the electronic device provided by the embodiment of the present application will be given.

[0094] Refer to Figure 5As shown, the electronic device 500 provided in this application embodiment includes at least a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the processor 501 executes the computer program, it implements the electronic water pump control method provided in this application embodiment; wherein, the electronic device provided in this application embodiment is an electronic water pump controller.

[0095] The electronic device 500 provided in this application embodiment may further include a bus 503 connecting different components (including processor 501 and memory 502). The bus 503 represents one or more types of bus structures, including memory bus, peripheral bus, local area bus, etc.

[0096] Memory 502 may include a readable storage medium in the form of volatile memory, such as random access memory (RAM) 5021 and / or cache memory 5022, and may further include read-only memory (ROM) 5023. Memory 502 may also include a program tool 5025 having a set (at least one) of program modules 5024, including but not limited to an operating subsystem, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0097] Processor 501 can be a single processing element or a collective term for multiple processing elements. For example, processor 501 can be a central processing unit (CPU) or one or more integrated circuits configured to implement the electronic water pump control method provided in the embodiments of this application. Specifically, processor 501 can be a general-purpose processor, including but not limited to CPUs, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0098] Electronic device 500 can communicate with one or more external devices 504 (e.g., keyboard, remote control, etc.), and also with one or more devices that enable a user to interact with electronic device 500 (e.g., mobile phone, computer, etc.), and / or with devices that enable electronic device 500 to communicate with one or more other electronic devices 500 (e.g., router, modem, etc.). This communication can be performed through input / output (I / O) interface 505. Furthermore, electronic device 500 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) through network adapter 506. Figure 5 As shown, network adapter 506 communicates with other modules of electronic device 500 via bus 503. It should be understood that, although... Figure 5 As not shown, other hardware and / or software modules may be used in conjunction with the electronic device 500, including but not limited to microcode, device drivers, redundant processors, external disk drive arrays, Redundant Arrays of Independent Disks (RAID) subsystems, tape drives, and data backup storage subsystems.

[0099] It should be noted that, Figure 5 The electronic device 500 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0100] The computer-readable storage medium provided in the embodiments of this application is described below. The computer-readable storage medium provided in the embodiments of this application stores computer instructions, which, when executed by a processor, implement the electronic water pump control method provided in the embodiments of this application. Specifically, the computer instructions can be built into or installed in the processor, so that the processor can implement the electronic water pump control method provided in the embodiments of this application by executing the built-in or installed computer instructions.

[0101] In addition, the electronic water pump control method provided in this application embodiment can also be implemented as a computer program product, which includes program code. The program code implements the electronic water pump control method provided in this application embodiment when it is run on a processor.

[0102] The computer program product provided in this application embodiment may employ one or more computer-readable storage media, which may be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. Specifically, more specific examples (a non-exhaustive list) of computer-readable storage media include electrical connections with one or more wires, portable disks, hard disks, RAM, ROM, erasable programmable read-only memory (EPROM), optical fibers, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0103] The computer program product provided in this application embodiment can be a CD-ROM and include program code, and can also run on electronic devices such as computers. However, the computer program product provided in this application embodiment is not limited thereto. In this application embodiment, the computer-readable storage medium can be any tangible medium that contains or stores program code, which can be used by or in conjunction with an instruction execution system, device, or apparatus.

[0104] It should be noted that although several units or sub-units of the device have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of this application, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided and embodied by multiple units.

[0105] Furthermore, although the operations of the method of this application are described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0106] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0107] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of the embodiments of this application. Therefore, if these modifications and variations to the embodiments of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. An electronic water pump control method, characterized in that, include: During the vehicle assembly phase, before adding coolant, the electronic water pump is controlled to be in assembly protection mode. In the assembly protection mode, the electronic water pump is controlled to operate at a first speed; wherein, the first speed is a pre-calibrated safe speed that allows the electronic water pump to operate stably before adding coolant.

2. The electronic water pump control method according to claim 1, characterized in that, During the operation of the electric water pump at its first rotational speed, the following also applies: If a working request for the electronic water pump is received, the required speed of the working request is not responded to, and the electronic water pump is kept running at the first speed.

3. The electronic water pump control method according to claim 2, characterized in that, During the operation of the electric water pump at its first rotational speed, the following also applies: If the electronic water pump is detected to be running idle, the electronic water pump is controlled to switch to the idle protection mode. In the idling protection mode, the electronic water pump is controlled to operate at a second speed; wherein, the second speed is a pre-calibrated safe speed that allows the electronic water pump to operate stably in an idling state; the second speed is not higher than the first speed.

4. The electronic water pump control method according to claim 3, characterized in that, Also includes: In the idling protection mode, if a working request for the electronic water pump is received, the required speed of the working request is not responded to, and the electronic water pump is kept running at the second speed.

5. The electronic water pump control method according to claim 3, characterized in that, If the electronic water pump is detected to be running idle, the following steps are also included: Obtain the number of times the electronic water pump idles; When the number of idle cycles reaches a first threshold, the electronic water pump is controlled to stop running.

6. The electronic water pump control method according to claim 5, characterized in that, After obtaining the number of idle cycles of the electronic water pump, the method further includes: When the number of idle cycles reaches the second threshold, an idle fault is reported to the vehicle controller, so that the vehicle controller outputs an idle fault prompt; wherein, the second threshold is less than the first threshold.

7. The electronic water pump control method according to claim 3, characterized in that, Also includes: During the operation of the electronic water pump at the second speed, the electronic water pump is periodically restarted; If, after each restart of the electronic water pump, it is detected that the electronic water pump is still idling and the number of restarts of the electronic water pump reaches the third threshold, then the electronic water pump is controlled to stop running.

8. The electronic water pump control method according to claim 7, characterized in that, Also includes: After each restart of the electronic water pump, if it is detected that the electronic water pump has exited the idling state, the electronic water pump is controlled to return to the assembly protection mode.

9. The electronic water pump control method according to claim 3, characterized in that, Also includes: During the operation of the electronic water pump at the second speed, the idling time of the electronic water pump is monitored; If the idling time is detected to reach the fourth threshold, the electronic water pump will be controlled to stop running.

10. The electronic water pump control method according to any one of claims 5-9, characterized in that, After controlling the electronic water pump to stop operating, the system also includes: In response to a command to power up the vehicle battery or clear a fault code, the electronic water pump is controlled to return to the assembly protection mode.

11. An electronic water pump control device, characterized in that, include: The mode control module is used to control the electronic water pump to be in assembly protection mode before adding coolant during the vehicle assembly stage. A speed control module is used to control the electronic water pump to operate at a first speed in the assembly protection mode; wherein the first speed is a pre-calibrated safe speed that allows the electronic water pump to operate stably before adding coolant.

12. A vehicle, characterized in that, Includes the electronic water pump control device as described in claim 11.

13. An electronic device, characterized in that, The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the electronic water pump control method as described in any one of claims 1 to 10.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the electronic water pump control method as described in any one of claims 1 to 10.

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