A fault processing method and device of an electronic water pump, a vehicle and a storage medium

Abstract

This application provides a method, apparatus, vehicle, and storage medium for handling faults in an electronic water pump. The method, applied in the vehicle field, includes: upon detecting a fault in the electronic water pump in the vehicle, acquiring the vehicle's current operating parameters; determining a target torque value to which the engine's output torque should be limited based on the operating parameters; wherein different operating parameters correspond to different target torque values; and performing torque limiting control on the engine based on the target torque value. This method, by combining a torque limiting scheme with the operating parameters, can protect the engine while reducing the impact of the electronic water pump fault on driving when a fault occurs in the electronic water pump.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more specifically, to a method, apparatus, vehicle, and storage medium for troubleshooting an electronic water pump in the field of vehicles. Background Technology

[0002] With technological advancements, electrified control components are gradually replacing traditional mechanical control components. An electric water pump is an example of an integrated controller module. The controller drives a brushless motor, which in turn rotates the impeller. The electric water pump can communicate with the vehicle via a communication protocol, adjusting its speed based on the target speed input from the vehicle.

[0003] When an electric water pump malfunctions, it can easily cause the engine coolant temperature to overheat. Therefore, the engine's output torque is usually limited to prevent overheating. However, currently, whenever an electric water pump malfunction is detected, the engine's output torque is typically limited to a fixed value to protect the engine. This torque limiting scheme struggles to simultaneously protect the engine and reduce the impact of electric water pump failure on driving. Summary of the Invention

[0004] This application provides a method, apparatus, vehicle, and storage medium for handling faults in an electronic water pump. The method can reduce the impact of the electronic water pump failure on driving by combining a torque limiting scheme with operating parameters when the electronic water pump fails.

[0005] In a first aspect, a fault handling method for an electronic water pump is provided. The method includes: when a fault is detected in the electronic water pump in the vehicle, acquiring the current operating parameters of the vehicle; determining a target torque value to which the output torque of the engine should be limited based on the operating parameters; wherein different operating parameters correspond to different target torque values; and performing torque limiting control on the engine based on the target torque value.

[0006] The above technical solution, upon detecting a malfunction in the electronic water pump, obtains the vehicle's current operating parameters. Based on these parameters, it determines the target torque value to which the engine's output torque should be limited. Different operating parameters correspond to different target torque values. Based on this target torque value, torque limiting control is applied to the engine. In other words, this technical solution does not directly limit the engine's output torque to a fixed value upon detecting a malfunction in the electronic water pump. Instead, it first determines the vehicle's current operating parameters, then identifies the appropriate target torque value for limiting the engine's output torque under those parameters. This allows for a reasonable limitation of the engine's output torque under the current operating parameters, enabling the engine to operate at its maximum capacity under the current conditions. This protects the engine while reducing the impact of the electronic water pump malfunction on driving.

[0007] In conjunction with the first aspect, in some possible implementations, the aforementioned operating parameters include the rotational speed of the aforementioned electronic water pump. Determining the target torque value to which the engine output torque should be limited based on the aforementioned operating parameters includes: determining, based on the rotational speed of the aforementioned electronic water pump, whether the electronic water pump is currently able to circulate the coolant inside the engine; if the aforementioned electronic water pump is currently unable to circulate the coolant inside the engine, then adjusting the preset torque limit value according to a first adjustment strategy to obtain the target torque value to which the engine output torque should be limited; wherein the aforementioned preset torque limit value is a pre-calibrated limit value for the vehicle's engine output torque when the aforementioned electronic water pump malfunctions; if the aforementioned electronic water pump is currently able to circulate the coolant inside the engine, then adjusting the aforementioned preset torque limit value according to a second adjustment strategy to obtain the target torque value to which the engine output torque should be limited.

[0008] In conjunction with the first aspect, in some possible implementations, the aforementioned operating parameters also include engine coolant temperature. The aforementioned adjustment of the preset torque limit value according to the first adjustment strategy to obtain the target torque value to which the engine output torque should be limited includes: adjusting the preset torque limit value according to the engine coolant temperature and a preset first torque value table to obtain the target torque value to which the engine output torque should be limited; wherein the target torque value is less than the preset torque limit value, and the first torque value table contains target torque values ​​corresponding to different engine coolant temperatures.

[0009] In conjunction with the first aspect, in some possible implementations, the target torque value is greater than or equal to the engine output torque value required to maintain the vehicle's limpness when the engine is in a target state, where the target state is the state where the engine coolant temperature is below a preset temperature threshold.

[0010] In conjunction with the first aspect, in some possible implementations, the aforementioned operating parameters also include engine coolant temperature. The adjustment of the preset torque limit value according to the second adjustment strategy to obtain the target torque value to which the engine output torque should be limited includes: determining whether the engine coolant temperature is greater than a preset safe coolant temperature; if the engine coolant temperature is less than or equal to the preset safe coolant temperature, adjusting the preset torque limit value according to the engine coolant temperature and a preset second torque value table, and using the adjusted torque limit value as the target torque value to which the engine output torque should be limited; wherein the target torque value is greater than the preset torque limit value, and the second torque value table contains target torque values ​​corresponding to different engine coolant temperatures.

[0011] In conjunction with the first aspect, in some possible implementations, the aforementioned operating parameters further include: the current gear and engine speed of the vehicle, and the aforementioned method further includes: if the engine coolant temperature is greater than the preset safe coolant temperature, adjusting the preset torque limit value according to the engine coolant temperature and the second torque value table to obtain the adjusted torque limit value; determining a correction coefficient according to the current gear and engine speed; and correcting the adjusted torque limit value according to the correction coefficient to obtain the target torque value to which the engine output torque should be limited.

[0012] In conjunction with the first aspect, in some possible implementations, determining the correction coefficient based on the current gear and engine speed includes: determining the rate of increase of the engine coolant temperature based on the current gear and engine speed; determining the correction coefficient based on the rate of increase of the engine coolant temperature; wherein the rate of increase is negatively correlated with the correction coefficient.

[0013] Secondly, a fault handling device for an electronic water pump is provided. The device includes: an acquisition module for acquiring the current operating parameters of the vehicle when a fault is detected in the electronic water pump; a determination module for determining a target torque value to which the output torque of the engine should be limited based on the operating parameters; wherein different operating parameters correspond to different target torque values; and a torque limiting module for performing torque limiting control on the engine based on the target torque value.

[0014] In conjunction with the second aspect, in some possible implementations, the aforementioned operating parameters include the rotational speed of the aforementioned electronic water pump, and the determining module includes: a judging unit, used to judge whether the aforementioned electronic water pump can currently circulate the coolant inside the engine based on the rotational speed of the aforementioned electronic water pump; a first adjustment unit, used to adjust a preset torque limit value according to a first adjustment strategy if the aforementioned electronic water pump cannot currently circulate the coolant inside the engine, to obtain a target torque value to which the engine output torque should be limited; wherein the aforementioned preset torque limit value is a limit value for the engine output torque pre-calibrated for the aforementioned vehicle when the aforementioned electronic water pump malfunctions; and a second adjustment unit, used to adjust the aforementioned preset torque limit value according to a second adjustment strategy if the aforementioned electronic water pump can currently circulate the coolant inside the engine, to obtain a target torque value to which the engine output torque should be limited.

[0015] In conjunction with the second aspect, in some possible implementations, the first adjustment unit is specifically used to adjust the preset torque limit value according to the engine coolant temperature and the preset first torque value table to obtain the target torque value to which the engine output torque should be limited; wherein, the target torque value is less than the preset torque limit value, and the first torque value table contains the target torque values ​​corresponding to different engine coolant temperatures.

[0016] In conjunction with the second aspect, in some possible implementations, the target torque value is greater than or equal to the engine output torque value required to maintain the vehicle's limpness when the engine is in a target state, where the target state is the state where the engine coolant temperature is below a preset temperature threshold.

[0017] In conjunction with the second aspect, in some possible implementations, the aforementioned operating parameters also include engine coolant temperature. The second adjustment unit is specifically used to: determine whether the engine coolant temperature is greater than a preset safe coolant temperature; if the engine coolant temperature is less than or equal to the preset safe coolant temperature, then adjust the preset torque limit value according to the engine coolant temperature and a preset second torque value table, and use the adjusted torque limit value as the target torque value to which the engine output torque should be limited; wherein, the target torque value is greater than the preset torque limit value, and the second torque value table contains target torque values ​​corresponding to different engine coolant temperatures.

[0018] In conjunction with the second aspect, in some possible implementations, the aforementioned operating parameters further include: the current gear and engine speed of the vehicle. The second adjustment unit is specifically used to: if the engine coolant temperature is greater than the preset safe coolant temperature, adjust the preset torque limit value according to the engine coolant temperature and the second torque value table to obtain the adjusted torque limit value; determine a correction coefficient according to the current gear and engine speed; and correct the adjusted torque limit value according to the correction coefficient to obtain the target torque value to which the engine output torque should be limited.

[0019] In conjunction with the second aspect, in some possible implementations, the second adjustment unit is specifically used to: determine the rate of increase of the engine coolant temperature based on the current gear and engine speed; and determine the correction coefficient based on the rate of increase of the engine coolant temperature; wherein the rate of increase is negatively correlated with the correction coefficient.

[0020] Thirdly, a vehicle is provided, including a memory for storing executable program code; and a processor for calling and running the executable program code from the memory, causing the vehicle to perform the method described in the first aspect or any possible implementation thereof.

[0021] Fourthly, a computer program product is provided, comprising: computer program code, which, when run on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof.

[0022] Fifthly, a computer-readable storage medium is provided that stores computer program code, which, when executed on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof. Attached Figure Description

[0023] Figure 1 This is a schematic flowchart of a fault handling method for an electronic water pump provided in an embodiment of this application;

[0024] Figure 2 This is a schematic flowchart of another fault handling method for an electronic water pump provided in the embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a fault handling device for an electronic water pump provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application. Detailed Implementation

[0027] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0028] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] With technological advancements, electrified control components are gradually replacing traditional mechanical control components. An electric water pump is an example of an integrated controller module. The controller drives a brushless motor, which in turn rotates the impeller. The electric water pump can communicate with the vehicle via a communication protocol, adjusting its speed based on the target speed input from the vehicle.

[0030] When an electric water pump malfunctions, it can easily cause the engine coolant temperature to overheat. Therefore, the engine's output torque is usually limited to prevent overheating. However, currently, whenever an electric water pump malfunction is detected, the engine's output torque is typically limited to a fixed value to protect the engine. However, because engine friction losses vary at different coolant temperatures, the output torque required to maintain vehicle limp-walking also varies at different engine temperatures. This means that if the fixed value is set too high, it will not protect the engine at high coolant temperatures; if the fixed value is set too low, it will not be able to maintain vehicle limp-walking at low coolant temperatures, or even maintain idle speed. Therefore, this torque limiting scheme is insufficient to both protect the engine and reduce the impact of electric water pump malfunction on driving.

[0031] Based on this, in order to solve the above-mentioned technical problems, this application provides a fault handling method for an electronic water pump, which is applied to a vehicle, specifically to a controller in the vehicle, which can be an engine control module (ECM). The fault handling method in this embodiment can reasonably limit the engine's output torque based on current operating parameters when the electronic water pump malfunctions. This helps to protect the engine while reducing the impact of the electronic water pump malfunction on driving. In other words, while ensuring the engine coolant temperature does not exceed the limit, it minimizes the impact of the electronic water pump malfunction on driving, allowing customers to drive the vehicle to a service station for repair or move it to a safe location.

[0032] Figure 1 This is a schematic flowchart of a fault handling method for an electronic water pump provided in an embodiment of this application.

[0033] For example, such as Figure 1 As shown, the above-mentioned fault handling methods include:

[0034] Step 101: If a malfunction is detected in the electric water pump in the vehicle, obtain the vehicle's current operating parameters.

[0035] Step 102: Based on the above operating parameters, determine the target torque value to which the engine output torque should be limited; different operating parameters correspond to different target torque values.

[0036] Step 103: Based on the above target torque value, control the engine output torque.

[0037] exist Figure 1 In the embodiment shown, when a fault is detected in the electronic water pump, the engine's output torque is not directly limited to a fixed value. Instead, the vehicle's current operating parameters are first determined, and then a target torque value that is suitable for limiting the engine's output torque under the current operating parameters is determined. Based on this target torque value, the engine's output torque can be reasonably limited under the current operating parameters, which helps the engine to perform at its maximum capacity under the current operating conditions. This protects the engine while reducing the impact of the electronic water pump fault on driving.

[0038] The following is about Figure 1 The specific implementation methods of each step in the illustrated embodiment are explained;

[0039] In step 101, the controller can acquire the operating parameters of the electronic water pump and perform fault diagnosis based on these parameters to determine whether the electronic water pump has malfunctioned. For example, the malfunction of the electronic water pump may be a stall fault, dry run fault, overcurrent fault, low pressure fault, overpressure fault, overtemperature fault, etc. This embodiment does not specifically limit the type of fault that the electronic water pump malfunctions to.

[0040] When a malfunction of the electric water pump is detected, the controller acquires the vehicle's current operating parameters, which may include parameters related to engine coolant temperature. These engine coolant temperature-related parameters can include the engine coolant temperature itself and parameters that affect its change, such as the electric water pump's speed, engine speed, and the vehicle's current gear. The vehicle's current operating parameters can also be understood as its current operating conditions.

[0041] In step 102, the controller determines a target torque value that the engine's output torque should be limited to under the current operating parameters of the vehicle. By setting this target torque value appropriately, the rate of increase in engine coolant temperature can be reduced, thus protecting the engine, while also allowing the engine to operate at its maximum capacity under the current operating parameters. This minimizes the impact of the electronic water pump failure on driving, and at the very least, maintains vehicle limp-proof capability. In other words, the principle for setting this target torque value is: to ensure that the engine coolant temperature does not exceed the limit while maximizing the engine's capacity under the current operating parameters.

[0042] For example, the vehicle can pre-store the correspondence between operating parameters and target torque values, allowing the controller to determine, based on this correspondence, the target torque value to which the engine's output torque should be limited under the current operating parameters. For instance, this correspondence can be stored in the vehicle in the form of Table 1 below:

[0043] Table 1

[0044] Operating conditions Target torque value Operating Condition 1 Torque value 1 Operating Condition 2 Torque value 2 Operating Condition 3 Torque value 3 …… ……

[0045] In Table 1 above, the different target torque values ​​corresponding to different operating conditions can be pre-calibrated. For example, a fault in the electronic water pump can be simulated in advance, and the target torque value of the engine can be calibrated under different operating conditions. This ensures that under the action of the target torque value, the rate of increase in engine coolant temperature can be reduced to protect the engine, while also allowing the engine to operate at its maximum capacity under the current operating conditions, minimizing the impact of the electronic water pump fault on driving. For instance, simulating a fault in the electronic water pump under operating condition 1, the torque value 1 can be calibrated under operating condition 1. This ensures that under the action of torque value 1, the rate of increase in engine coolant temperature can be reduced to protect the engine, while also allowing the engine to operate at its maximum capacity under the current operating conditions, minimizing the impact of the electronic water pump fault on driving. The calibration under other operating conditions is similar and will not be elaborated on here.

[0046] In step 103, based on the target torque value corresponding to the current operating parameters, the engine's output torque is limited to the aforementioned target torque value. Torque limitation means that if the requested torque value carried in the engine's actual torque request is greater than the target torque value, the engine's output torque is limited to the target torque value to prevent the engine's output torque from exceeding the target torque value. In other words, the target torque value is the maximum torque value allowed to be output by the engine under the current operating parameters when the electronic water pump malfunctions. If the requested torque value carried in the engine's actual torque request is less than or equal to the target torque value, the engine's output torque can be controlled according to the requested torque value carried in the actual torque request.

[0047] In an exemplary embodiment, the above-mentioned operating parameters include the rotational speed of the electric water pump, and the implementation of step 102 includes the following steps 1021 to 1023:

[0048] Step 1021: Based on the speed of the electric water pump, determine whether the electric water pump is currently able to circulate the coolant inside the engine. If yes, proceed to step 1023; otherwise, proceed to step 1022.

[0049] If the electric water pump can currently circulate the coolant inside the engine, it indicates that although the pump has malfunctioned, it still possesses a certain cooling capacity. This limited cooling capacity prevents the engine coolant temperature from rising too quickly, and the target torque value does not need to be set too low. Conversely, if the electric water pump cannot currently circulate the coolant inside the engine, it indicates a malfunction and a lack of cooling capacity. In this case, the engine coolant temperature will rise rapidly, and the target torque value needs to be set lower.

[0050] Specifically, you can determine if the electric water pump's speed exceeds the rated speed. If it does, it means the electric water pump is currently operating at a certain speed, thus indicating that it can circulate the coolant inside the engine. If the electric water pump's speed does not exceed the rated speed, it means it is not currently operating at a certain speed, thus indicating that it cannot circulate the coolant inside the engine.

[0051] The calibrated speed value can be determined based on the actual heat dissipation capacity of the electric water pump. This calibrated speed value represents the minimum operating speed required for the electric water pump to circulate the coolant inside the engine. Different types of electric water pumps may have different calibrated speed values ​​due to the differences in their actual components. Therefore, this embodiment does not specifically limit the magnitude of the calibrated speed value.

[0052] Step 1022: Adjust the preset torque limit value according to the first adjustment strategy to obtain the target torque value to which the engine output torque should be limited.

[0053] The preset torque limit value is a limit value for the engine output torque that is pre-calibrated for the vehicle when the electronic water pump fails. This preset torque value can be a fixed value in the prior art, that is, a fixed value that limits the engine output torque when the electronic water pump fails.

[0054] Specifically, if the electric water pump is currently unable to circulate the coolant inside the engine, the preset torque limit value can be adjusted according to the first adjustment strategy to obtain the target torque value to which the engine's output torque should be limited.

[0055] For example, the implementation of step 1022 above may include: adjusting a preset torque limit value according to the engine coolant temperature and a preset first torque value table to obtain a target torque value to which the engine output torque should be limited; wherein the target torque value is less than the preset torque limit value, and the first torque value table contains target torque values ​​corresponding to different engine coolant temperatures. That is, in this embodiment, the preset torque limit value is reduced according to the engine coolant temperature to obtain a target torque value to which the engine output torque should be limited, so that the target torque value is less than the preset torque limit value.

[0056] When the electric water pump malfunctions and cannot circulate the coolant inside the engine, the engine temperature will rise rapidly. The controller can adjust the preset torque limit based on the current engine temperature to protect the engine and prevent overheating. There is a negative correlation between engine temperature and the target torque value; that is, the higher the engine temperature, the lower the target torque value. In other words, the higher the engine temperature, the greater the reduction in the preset torque limit, resulting in a smaller final target torque value.

[0057] The aforementioned first torque value table can be pre-calibrated. For example, simulating a scenario where the electric water pump malfunctions and cannot circulate the coolant inside the engine, the target torque values ​​suitable for different engine coolant temperatures are calibrated under this condition, thus obtaining the aforementioned first torque value table. Furthermore, if a malfunction of the electric water pump is detected and it cannot circulate the coolant inside the engine, the first torque value table can be consulted based on the current engine coolant temperature to obtain the suitable target torque value at the current engine coolant temperature.

[0058] For example, the target torque value is greater than or equal to the engine output torque value required to maintain vehicle limpness when the engine is in a target state, where the engine coolant temperature is below a preset temperature threshold. The preset temperature threshold can be pre-set to measure whether the engine coolant temperature is low, i.e., the target torque value is greater than or equal to the torque value required to maintain vehicle limpness at low temperatures. In other words, in this embodiment, although the preset torque limit value is adjusted to be reduced, the minimum target torque value obtained after the reduction adjustment can still allow the vehicle to maintain limpness.

[0059] Specifically, the engine output torque value required to maintain limpness at low temperatures can be obtained by combining the friction loss of the actual vehicle at low temperatures.

[0060] Step 1023: Adjust the preset torque limit value according to the second adjustment strategy to obtain the target torque value to which the engine output torque should be limited.

[0061] Specifically, if the electric water pump is currently able to circulate the coolant inside the engine, the preset torque limit value can be adjusted according to the second adjustment strategy to obtain the target torque value to which the engine's output torque should be limited. In other words, in this embodiment, different adjustment strategies are used to adjust the preset torque limit value based on whether the electric water pump can maintain a certain speed to circulate the coolant inside the engine, in order to adapt to the actual heat dissipation capacity when the electric water pump fails.

[0062] For example, step 1023 above is implemented by: determining whether the engine coolant temperature is greater than a preset safe coolant temperature; if the engine coolant temperature is less than or equal to the preset safe coolant temperature, adjusting the preset torque limit value according to the engine coolant temperature and a preset second torque value table, and using the adjusted torque limit value as the target torque value to which the engine output torque should be limited. That is, in this example, if the engine coolant temperature is less than or equal to the preset safe coolant temperature, the preset torque limit value is increased according to the engine coolant temperature, and the increased torque limit value is used as the target torque value to which the engine output torque should be limited.

[0063] The preset safe coolant temperature can be pre-calibrated. An engine coolant temperature higher than the preset safe coolant temperature indicates that the engine coolant temperature has reached the limit requiring protection. An engine coolant temperature lower than or equal to the preset safe coolant temperature indicates that the engine coolant temperature has not reached the limit requiring protection.

[0064] In this embodiment, when the electronic water pump malfunctions but still allows coolant circulation within the engine, it indicates that although the pump has failed, it still possesses a certain cooling capacity. If the engine coolant temperature has not reached the required protection limit, the preset torque limit can be appropriately increased to allow the vehicle to operate normally as much as possible. Specifically, the engine coolant temperature is negatively correlated with the target torque value obtained by increasing the preset torque limit; that is, the higher the engine coolant temperature, the lower the target torque value. In other words, the higher the engine coolant temperature, the smaller the increase in the preset torque limit, resulting in a smaller target torque value. Conversely, the lower the engine coolant temperature, the larger the increase in the preset torque limit, resulting in a larger target torque value.

[0065] The aforementioned second torque value table can be pre-calibrated. For example, simulating a scenario where the electric water pump malfunctions but is currently able to circulate the coolant inside the engine, the target torque values ​​suitable for different engine coolant temperatures are calibrated under this condition, thus obtaining the aforementioned second torque value table. Furthermore, if a malfunction of the electric water pump is detected but it is currently able to circulate the coolant inside the engine, the second torque value table can be consulted based on the current engine coolant temperature to obtain the suitable target torque value at the current engine coolant temperature.

[0066] In the above situation, although the electronic water pump is faulty, it still has a certain heat dissipation capacity, and the engine water temperature has not reached the water temperature limit that needs protection. At this time, even if the preset torque limit value is appropriately increased, it will not damage the engine. On the contrary, it can enable the vehicle to drive normally as much as possible and reduce the impact of the electronic water pump failure on driving.

[0067] For example, the operating parameters also include: the vehicle's current gear and engine speed. The implementation of step 1023 also includes: if the engine coolant temperature is higher than the preset safe coolant temperature, then adjust the engine output torque limit value according to the engine coolant temperature and the second torque value table mentioned above to obtain the adjusted torque limit value; determine the correction coefficient according to the vehicle's current gear and engine speed; and correct the adjusted torque limit value according to the correction coefficient to obtain the target torque value to which the engine output torque should be limited.

[0068] In this embodiment, when the electronic water pump malfunctions but can still circulate the coolant inside the engine, it indicates that although the electronic water pump has malfunctioned, it still has a certain heat dissipation capacity. At this time, the preset torque limit value can be appropriately increased. At the same time, since the engine water temperature is higher than the preset safe water temperature, that is, it has reached the water temperature limit that needs to be protected, the increased torque limit value needs to be further corrected to avoid the engine water temperature rising too quickly when the engine water temperature has already reached the water temperature limit that needs to be protected, due to directly increasing the preset torque limit value.

[0069] The method to correct the increased torque limit value is as follows: first, determine the correction coefficient based on the vehicle's current gear and engine speed, and then multiply the correction coefficient by the increased torque limit value as the target torque value to which the engine's output torque should be limited.

[0070] For example, the correction factor corresponding to the current gear and engine speed can be determined based on the pre-stored correspondence between gear, engine speed, and correction factor. For instance, the correction factor can be determined by querying a pre-set correction factor table based on the current gear and engine speed; this table contains correction factors corresponding to different engine speeds at multiple gears.

[0071] For example, when the electric water pump malfunctions but can maintain a certain speed to circulate the coolant, and the engine coolant temperature reaches the protection limit, if the vehicle is in a high gear and the engine speed is high, heat will accumulate quickly, and the engine coolant temperature may rise rapidly in the following period. In this case, the increased torque limit value can be adjusted to be smaller using a correction factor to avoid overheating and prevent engine damage. For instance, the increased torque limit value can be multiplied by a correction factor less than 1 so that the product is less than the increased torque limit value, thus achieving a smaller increase in the torque limit value through the correction factor.

[0072] For example, when the electric water pump malfunctions but can maintain a certain speed to circulate the coolant, and the engine coolant temperature reaches the protection limit, if the vehicle is in a low gear and the engine speed is slow, the engine coolant temperature may gradually decrease over time. If a small output torque limit is still applied to the engine at this time, it will affect the user's driving experience. Therefore, this embodiment can further adjust the increased torque limit value by a correction factor to be larger, improving the user experience while ensuring engine safety and avoiding the impact of the electric water pump malfunction on driving. For example, the increased torque limit value can be multiplied by a correction factor greater than 1, so that the product is greater than the increased torque limit value, thereby achieving a further increase in the increased torque limit value through the correction factor.

[0073] For example, determining the correction coefficient based on the current gear and engine speed includes: determining the rate of increase of engine coolant temperature based on the current gear and engine speed; and determining the correction coefficient based on the rate of increase of engine coolant temperature; wherein the rate of increase is negatively correlated with the correction coefficient.

[0074] Specifically, the rate of engine coolant temperature rise under the current gear and engine speed can be determined. Based on this rate of temperature rise, a correction coefficient is determined; the faster the rise, the smaller the correction coefficient. This ensures that even with a rapid temperature rise, the increased torque limit can be adjusted with a smaller correction coefficient, resulting in a smaller target torque value compared to the increased torque limit, thus mitigating the problem of a rapid engine coolant temperature rise. Generally, at the same gear, the higher the engine speed, the faster the engine coolant temperature rises, the smaller the corresponding correction coefficient, and the smaller the resulting target torque value. Similarly, at the same engine speed, the higher the gear, the faster the engine coolant temperature rises, the smaller the corresponding correction coefficient, and the smaller the resulting target torque value.

[0075] For example, a schematic flowchart of a fault handling method for an electronic water pump can be found here. Figure 2 ,include:

[0076] Step 201: Check if the electric water pump is malfunctioning. If so, proceed to step 202; otherwise, proceed to step 208.

[0077] Step 202: Determine if the speed of the electric water pump exceeds the rated speed value. If yes, proceed to step 203; otherwise, proceed to step 204.

[0078] Step 203: Determine if the engine coolant temperature exceeds the preset safe coolant temperature. If yes, proceed to step 205; otherwise, proceed to step 206.

[0079] Step 204: Adjust the preset torque limit value by decreasing it according to the engine coolant temperature to obtain the target torque value.

[0080] Step 205: Based on the engine coolant temperature, increase the preset torque limit value, and use the product of the correction coefficient determined based on the current gear and engine speed and the increased torque limit value as the target torque value.

[0081] Step 206: Based on the engine coolant temperature, increase the preset torque limit value and use the increased torque limit value as the target torque value.

[0082] Step 207: Based on the target torque value, perform torque limiting control on the engine.

[0083] Step 208: Do not apply torque limiting control to the engine output torque.

[0084] This embodiment provides a control strategy whereby, when an electric water pump fails, the controller limits the engine torque according to different operating conditions to protect the engine from overheating. This control strategy may include:

[0085] When the electric water pump malfunctions and its speed does not exceed the rated speed (i.e., the electric water pump cannot maintain a certain speed to circulate the coolant inside the engine), the engine will heat up rapidly. The controller can appropriately reduce the preset torque limit value according to the current engine water temperature to protect the engine from overheating and also allow the vehicle to maintain limp-riding even at low temperatures.

[0086] When the electronic water pump malfunctions, and the speed of the electronic water pump exceeds the rated speed (i.e., the electronic water pump can currently maintain a certain speed to circulate the coolant inside the engine), and the engine water temperature does not exceed the preset safe water temperature (i.e., the engine water temperature has not reached the limit that needs protection), the controller will appropriately increase the preset torque limit value according to the current engine water temperature, so that the vehicle can be driven normally as much as possible.

[0087] When the electric water pump malfunctions, and its speed exceeds the calibrated speed (meaning it can maintain a certain speed to circulate coolant within the engine), and the engine temperature exceeds the preset safe temperature (reaching a protection limit), the controller can, based on the vehicle's current gear and engine speed, multiply the increased preset torque limit by a correction factor to obtain the target torque value. Higher gears and engine speeds cause the engine temperature to rise faster. Therefore, by multiplying the increased torque limit by a correction factor less than 1, the increased torque limit can be appropriately reduced, resulting in a target torque value lower than the increased torque limit.

[0088] In this embodiment, when the electronic water pump malfunctions, different adjustment strategies are adopted based on the current vehicle operating parameters to adjust the preset torque limit value, limiting the engine output torque to a reasonable value. This not only protects the engine but also allows the engine to perform at its maximum capacity under the current operating conditions. Under the premise of ensuring that the engine does not overheat, the impact of the electronic water pump malfunction on driving is minimized, allowing the customer to drive the vehicle to a service station for repair or move it to a safe area.

[0089] Figure 3 This is a schematic diagram of the structure of a fault handling device for an electronic water pump provided in an embodiment of this application.

[0090] For example, such as Figure 3 As shown, the fault handling device 300 includes: an acquisition module 301, used to acquire the current operating parameters of the vehicle when a fault is detected in the electronic water pump in the vehicle; a determination module 302, used to determine the target torque value to which the output torque of the engine should be limited based on the operating parameters; wherein different operating parameters correspond to different target torque values; and a torque limiting module 303, used to perform torque limiting control on the engine based on the target torque value.

[0091] In one possible implementation, the operating parameters include the rotational speed of the electronic water pump. The determining module 302 includes: a judging unit, used to judge whether the electronic water pump can currently circulate the coolant inside the engine based on the rotational speed of the electronic water pump; a first adjusting unit, used to adjust a preset torque limit value according to a first adjusting strategy if the electronic water pump cannot currently circulate the coolant inside the engine, to obtain a target torque value to which the engine output torque should be limited; wherein the preset torque limit value is a limit value for the engine output torque pre-calibrated for the vehicle when the electronic water pump malfunctions; and a second adjusting unit, used to adjust the preset torque limit value according to a second adjusting strategy if the electronic water pump can currently circulate the coolant inside the engine, to obtain a target torque value to which the engine output torque should be limited.

[0092] In one possible implementation, the first adjustment unit is specifically used to adjust the preset torque limit value according to the engine coolant temperature and the preset first torque value table to obtain the target torque value to which the engine output torque should be limited; wherein, the target torque value is less than the preset torque limit value, and the first torque value table contains target torque values ​​corresponding to different engine coolant temperatures.

[0093] In one possible implementation, the target torque value is greater than or equal to the engine output torque value required to maintain the vehicle's limp when the engine is in a target state, where the engine coolant temperature is below a preset temperature threshold.

[0094] In one possible implementation, the aforementioned operating parameters also include engine coolant temperature. The second adjustment unit is specifically used to: determine whether the engine coolant temperature is greater than a preset safe coolant temperature; if the engine coolant temperature is less than or equal to the preset safe coolant temperature, adjust the preset torque limit value according to the engine coolant temperature and a preset second torque value table, and use the adjusted torque limit value as the target torque value to which the engine output torque should be limited; wherein, the target torque value is greater than the preset torque limit value, and the second torque value table contains target torque values ​​corresponding to different engine coolant temperatures.

[0095] In one possible implementation, the above operating parameters further include: the current gear and engine speed of the vehicle. The second adjustment unit is specifically used to: if the engine coolant temperature is higher than the preset safe coolant temperature, adjust the preset torque limit value according to the engine coolant temperature and the second torque value table to obtain the adjusted torque limit value; determine a correction coefficient according to the current gear and engine speed; and correct the adjusted torque limit value according to the correction coefficient to obtain the target torque value to which the engine output torque should be limited.

[0096] In one possible implementation, the second adjustment unit is specifically used to: determine the rate of increase of the engine coolant temperature based on the current gear and engine speed; and determine the correction coefficient based on the rate of increase of the engine coolant temperature; wherein the rate of increase is negatively correlated with the correction coefficient.

[0097] It should be noted that the fault handling device for the electronic water pump provided in the above embodiments is only illustrated by the division of the above functional modules when executing the fault handling method for the electronic water pump. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the fault handling device for the electronic water pump provided in the above embodiments and the fault handling method embodiments for the electronic water pump belong to the same concept. Therefore, for details not disclosed in the device embodiments of this application, please refer to the above-described fault handling method embodiments for the electronic water pump of this application, which will not be repeated here.

[0098] Figure 4 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0099] For example, such as Figure 4As shown, the vehicle includes a memory 401 and a processor 402, wherein the memory 401 stores executable program code, and the processor 402 is used to call and execute the executable program code to perform a fault handling method for an electronic water pump.

[0100] Furthermore, this application also protects an apparatus that may include a memory and a processor, wherein the memory stores executable program code, and the processor is used to call and execute the executable program code to perform a fault handling method for an electronic water pump provided in this application.

[0101] This embodiment can divide the device into functional modules based on the above method example. For example, each module can correspond to a separate function, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0102] When each functional module is divided according to its corresponding function, the device may also include an acquisition module, a determination module, a torque limiting module, etc. It should be noted that all relevant content of each step involved in the above method embodiments can be referenced to the functional description of the corresponding functional module, and will not be repeated here.

[0103] It should be understood that the device provided in this embodiment is used to execute the above-described method for handling faults in an electronic water pump, and therefore can achieve the same effect as the above-described implementation method.

[0104] When using an integrated unit, the device may include a processing module and a storage module. When the device is applied to a vehicle, the processing module can be used to control and manage the vehicle's movements. The storage module can be used to support the vehicle in executing program code, etc.

[0105] The processing module may be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits as disclosed in this application. The processor may also be a combination of computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and microprocessors, etc., and the storage module may be a memory.

[0106] In addition, the device provided in the embodiments of this application may specifically be a chip, component or module. The chip may include a connected processor and a memory. The memory is used to store instructions. When the processor calls and executes the instructions, the chip can execute the fault handling method for an electronic water pump provided in the above embodiments.

[0107] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the above-described related method steps to implement the fault handling method for an electronic water pump provided in the above embodiment.

[0108] This embodiment also provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned related steps to implement the fault handling method for an electronic water pump provided in the above embodiment.

[0109] In this embodiment, the device, computer-readable storage medium, computer program product, or chip are all used to execute the corresponding methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0110] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0111] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0112] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for troubleshooting an electronic water pump, characterized in that, include: If a malfunction is detected in the electric water pump in the vehicle, the current operating parameters of the vehicle are obtained, including the rotational speed of the electric water pump. Based on the rotational speed of the electronic water pump, determine whether the electronic water pump is currently able to circulate the coolant inside the engine; If the electric water pump is currently unable to circulate the coolant inside the engine, the preset torque limit value is adjusted according to the first adjustment strategy to obtain the target torque value to which the engine output torque should be limited; wherein, the preset torque limit value is a limit value for the engine output torque that is pre-calibrated for the vehicle when the electric water pump fails. If the electric water pump can currently circulate the coolant inside the engine, the preset torque limit value is adjusted according to the second adjustment strategy to obtain the target torque value to which the engine's output torque should be limited; wherein, different operating parameters correspond to different target torque values; Based on the target torque value, torque limiting control is applied to the engine.

2. The method according to claim 1, characterized in that, The operating parameters also include engine coolant temperature. The step of adjusting the preset torque limit value according to the first adjustment strategy to obtain the target torque value to which the engine output torque should be limited includes: Based on the engine coolant temperature and a preset first torque value table, the preset torque limit value is adjusted to obtain the target torque value to which the engine output torque should be limited; wherein, the target torque value is less than the preset torque limit value, and the first torque value table contains target torque values ​​corresponding to different engine coolant temperatures.

3. The method according to claim 2, characterized in that, The target torque value is greater than or equal to the engine output torque value required to maintain the vehicle's limpness when the engine is in a target state, where the engine coolant temperature is below a preset temperature threshold.

4. The method according to claim 1, characterized in that, The operating parameters also include engine coolant temperature. The step of adjusting the preset torque limit value according to the second adjustment strategy to obtain the target torque value to which the engine's output torque should be limited includes: Determine whether the engine coolant temperature is higher than the preset safe coolant temperature; If the engine coolant temperature is less than or equal to the preset safe coolant temperature, the preset torque limit value is adjusted according to the engine coolant temperature and the preset second torque value table, and the adjusted torque limit value is used as the target torque value to which the engine output torque should be limited; wherein, the target torque value is greater than the preset torque limit value, and the second torque value table contains target torque values ​​corresponding to different engine coolant temperatures.

5. The method according to claim 4, characterized in that, The operating parameters also include: the vehicle's current gear and engine speed; the method further includes: If the engine coolant temperature is greater than the preset safe coolant temperature, the preset torque limit value is adjusted according to the engine coolant temperature and the second torque value table to obtain the adjusted torque limit value. Determine the correction factor based on the current gear and engine speed; The adjusted torque limit value is corrected according to the correction factor to obtain the target torque value to which the engine output torque should be limited.

6. The method according to claim 5, characterized in that, The step of determining the correction coefficient based on the current gear and engine speed includes: The rate of increase of engine coolant temperature is determined based on the current gear and engine speed. The correction coefficient is determined based on the rate of increase of the engine coolant temperature; wherein the rate of increase is negatively correlated with the correction coefficient.

7. A fault handling device for an electronic water pump, characterized in that, include: The acquisition module is used to acquire the current operating parameters of the vehicle when a malfunction of the electric water pump in the vehicle is detected. The determining module is used to determine whether the electronic water pump is currently able to circulate the coolant inside the engine based on the rotational speed of the electronic water pump. If the electric water pump is currently unable to circulate the coolant inside the engine, then the preset torque limit value is adjusted according to the first adjustment strategy to obtain the target torque value to which the engine output torque should be limited; wherein, the preset torque limit value is a limit value for the engine output torque pre-calibrated for the vehicle when the electric water pump fails; if the electric water pump is currently able to circulate the coolant inside the engine, then the preset torque limit value is adjusted according to the second adjustment strategy to obtain the target torque value to which the engine output torque should be limited; wherein, different operating parameters correspond to different target torque values; The torque limiting module is used to limit the torque of the engine based on the target torque value.

8. A vehicle, characterized in that, The vehicles include: Memory, used to store executable program code; A processor for calling and running the executable program code from the memory, causing the vehicle to perform the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed, implements the method as described in any one of claims 1 to 6.

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