Troubleshooting method, electronic device, and vehicle

Abstract

The application provides a troubleshooting method, an electronic device and a vehicle. The method comprises obtaining engine operation information and electronic water pump operation information, determining whether the electronic water pump has a locked-rotor fault according to the engine operation information and / or the electronic water pump operation information. In response to determining that there is a locked-rotor fault, the electronic water pump speed is increased to a preset speed, and the electronic water pump is controlled to operate at the preset speed. After the current speed of the electronic water pump is increased to the preset speed, the electronic water pump flow is correspondingly increased. By increasing the electronic water pump flow, the electronic water pump can be self-recovered by being flushed open, the locked-rotor problem occurring at low speed can be eliminated, and the problems of electronic water pump ablation and engine water temperature rising occurring when the electronic water pump operates at low speed can be avoided. At the same time, by increasing the electronic water pump speed to realize self-recovery of the electronic water pump by being flushed open, the frequency of electronic water pump alarms can be reduced, thereby effectively reducing the number of manual maintenance times and improving user satisfaction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic water pumps, and in particular to a fault elimination method, an electronic device, and a vehicle. BACKGROUND

[0002] Under the background of energy conservation and emission reduction and rapid development of new energy, electronic water pumps are increasingly widely used on engines. The speed and power of the electronic water pump are dynamically changed according to the cooling demand of the engine. When the engine speed and heat dissipation demand are relatively low, the speed of the electronic water pump is also relatively low. However, during low-speed operation of the electronic water pump, the phenomenon of locked rotor may occur. Since the driving torque of the electronic water pump is low during low-speed operation, it cannot self-clear and recover, resulting in problems such as electronic water pump ablation and engine water temperature rising. SUMMARY

[0003] Therefore, the present application aims to provide a fault elimination method, an electronic device, and a vehicle to solve the problem that the electronic water pump cannot self-clear and recover when locked rotor occurs during low-speed operation.

[0004] To achieve the above purpose, the first aspect of the present application provides a fault elimination method, comprising:

[0005] obtaining engine operation information and electronic water pump operation information;

[0006] determining whether the electronic water pump has a locked rotor fault according to the engine operation information and / or the electronic water pump operation information;

[0007] in response to determining that there is a locked rotor fault, increasing the speed of the electronic water pump to a preset speed and controlling the electronic water pump to operate at the preset speed.

[0008] By increasing the flow of the electronic water pump, the electronic water pump can self-clear and recover, eliminating the problem of locked rotor, and avoiding the problems of electronic water pump ablation or engine water temperature rising during low-speed operation of the electronic water pump. At the same time, the frequency of electronic water pump alarms is reduced, thereby effectively reducing the number of manual maintenance and improving user satisfaction.

[0009] Optionally, the engine operation information includes engine water temperature, and the electronic water pump operation information includes actual speed of the electronic water pump; the determination of whether the electronic water pump has a locked rotor fault according to the engine operation information and / or the electronic water pump operation information comprises:

[0010] in response to determining that the actual speed of the electronic water pump meets a preset speed abnormality condition and the engine water temperature exceeds a preset upper water temperature threshold, it is determined that the electronic water pump has a locked rotor fault.

[0011] In the embodiment, after the rotation speed of the electronic water pump is abnormal and the engine water temperature exceeds the preset upper water temperature threshold, it is determined that the electronic water pump has a stall fault, which can accurately determine the stall fault and avoid misjudgment of the stall fault.

[0012] In the embodiment, after the rotation speed of the electronic water pump is abnormal and the engine water temperature exceeds the preset upper water temperature threshold, it is determined that the electronic water pump has a stall fault, which can accurately determine the stall fault and avoid misjudgment of the stall fault.

[0013] Optionally, the electronic water pump operation information includes an electronic water pump target rotation speed.

[0014] The determination that the actual rotation speed of the electronic water pump meets a preset rotation speed abnormality condition includes:

[0015] In response to a difference between the electronic water pump target rotation speed and the actual rotation speed of the electronic water pump being greater than a first preset difference threshold, it is determined that the actual rotation speed of the electronic water pump meets a preset rotation speed abnormality condition; wherein the electronic water pump target rotation speed is determined according to an engine rotation speed, an engine load, and a first preset relationship; in the first preset relationship, when the engine rotation speed is constant, the electronic water pump target rotation speed is positively correlated with the engine load; when the engine load is constant, the electronic water pump target rotation speed is positively correlated with the engine rotation speed.

[0016] Through the method of the embodiment, a quick determination method of the target rotation speed is given, and then whether the electronic water pump has a rotation speed abnormality problem can be quickly determined according to the target rotation speed and the actual rotation speed of the electronic water pump, which is beneficial to timely discovery of the electronic water pump abnormality and quick exclusion of the subsequent stall fault.

[0017] Optionally, the method further includes:

[0018] Within a preset time length during which the electronic water pump operates at the preset rotation speed, in response to a change rate of the engine water temperature being greater than a preset change rate threshold, the engine load is reduced.

[0019] By reducing the engine load, the problem of the engine water temperature rising is solved, the engine water temperature is quickly reduced, and the safety hazard caused by overheating of the engine is avoided.

[0020] Optionally, the reduction of the engine load includes:

[0021] A target limit load percentage of the engine is determined based on the engine water temperature and a second preset relationship, and the engine is controlled to operate according to the target limit load percentage; in the second preset relationship, the engine water temperature is positively correlated with the target limit load percentage.

[0022] In the embodiment, according to the engine water temperature, the engine load is controlled to decrease in a gradient, the engine load is dynamically adjusted according to the engine water temperature, the purpose of reducing the engine water temperature is achieved, the engine is ensured to maintain operation in a safe range, and the vehicle cannot normally run due to excessively reducing the engine load is avoided.

[0023] Optionally, after the electronic water pump is controlled to operate at the preset rotating speed, the method further comprises:

[0024] In response to the real-time acquired engine water temperature being less than a preset lower water temperature threshold, the electronic water pump is controlled to operate at the electronic water pump target rotating speed.

[0025] Through the method of the embodiment, after the engine water temperature is determined to decrease to the preset lower water temperature threshold, the electronic water pump operation is restored to normal, the rotating speed of the electronic water pump is adjusted to the target rotating speed, the power consumption of the electronic water pump can be reduced, and the engine water temperature is prevented from being too low.

[0026] Optionally, the engine operation information comprises an engine water temperature; and the method further comprises:

[0027] In response to the engine water temperature being located in a preset water temperature range, a stall impact frequency corresponding to the preset water temperature range is determined;

[0028] The electronic water pump is controlled to operate at the preset rotating speed according to the stall impact frequency.

[0029] The embodiment provides a method for preventing or reducing the rotating speed abnormality of the electronic water pump, the stall impact strategy can be adopted before the rotating speed abnormality of the electronic water pump occurs, the probability of the rotating speed abnormality of the electronic water pump occurring subsequently is effectively reduced, and user satisfaction is improved.

[0030] Optionally, the electronic water pump operation information comprises an electronic water pump target rotating speed and an electronic water pump actual current;

[0031] The method of determining whether the electronic water pump has a stall fault according to the engine operation information and / or the electronic water pump operation information comprises:

[0032] The electronic water pump target current is determined according to the electronic water pump target rotating speed and a third preset relationship;

[0033] In response to a difference between the electronic water pump actual current and the electronic water pump target current being greater than a second preset difference threshold, it is determined that the electronic water pump has a stall fault.

[0034] The embodiment provides a method for determining whether the electronic water pump has a stall fault according to an electronic water pump current, provides an additional judgment method for the determination of the stall fault, and enriches the judgment basis of the stall fault. In addition, when determining whether the electronic water pump has a stall fault, different judgment methods can be used to verify each other, so that the probability of misjudgment is further reduced.

[0035] Based on the same inventive concept, the second aspect of the present application further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable by the processor, wherein the processor implements the method according to the first aspect when executing the computer program.

[0036] Based on the same inventive concept, the third aspect of the present application further provides a vehicle, comprising the electronic device according to the second aspect.

[0037] As can be seen from the above, the present application provides a fault elimination method, an electronic device and a vehicle, the method comprising obtaining engine operation information and electronic water pump operation information, and determining whether the electronic water pump has a stall fault according to the engine operation information and / or the electronic water pump operation information. If the electronic water pump has a stall fault, it indicates that the electronic water pump is abnormal, and then the running state of the electronic water pump and the running state of the engine will change. Therefore, according to the electronic water pump operation information and the engine operation information, whether the electronic water pump has a stall fault can be accurately determined. In response to determining that there is a stall fault, the electronic water pump speed is increased to a preset speed, and the electronic water pump is controlled to operate at the preset speed. After the current speed of the electronic water pump is increased to the preset speed, the electronic water pump flow is correspondingly increased. If the stall fault is caused by the initial part tolerance of the electronic water pump or the reduction of waterway cleanliness, etc., the electronic water pump flow is increased to realize self-clearing recovery of the electronic water pump, to eliminate the stall problem at low speed, and to avoid the problems of electronic water pump ablation and engine water temperature rising when the electronic water pump operates at low speed. At the same time, increasing the speed of the electronic water pump to realize self-clearing recovery of the electronic water pump can also reduce the frequency of electronic water pump alarm, thereby effectively reducing the number of manual maintenance and improving user satisfaction. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present application or related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0039] Figure 1 The flowchart of the fault elimination method of the embodiment of the present application;

[0040] Figure 2 A structural schematic diagram of a troubleshooting device of an embodiment of the present application;

[0041] Figure 3 An electronic device hardware structural schematic diagram of an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the embodiments and the accompanying drawings.

[0043] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those with ordinary skills in the art to which the present application belongs. The terms "first", "second", and similar terms used in the embodiments of the present application do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like only represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0044] In the related art, the power for rotating the mechanical water pump comes from the front-end belt or chain. Even if the mechanical water pump appears to be slightly blocked, the belt or chain will increase the torque to pull the water pump to rotate, in order to overcome the blocking problem. The rotating speed of the mechanical water pump is affected by the rotating speed of the engine, and cannot be adjusted according to the cooling demand. The power for rotating the electronic water pump comes from the electromagnetic force, which relies on the excitation current control. The electronic water pump can realize accurate control of the coolant flow and temperature. When the engine rotating speed and heat dissipation demand are relatively low, the electronic water pump rotating speed is low for rapid warming and reducing heat dissipation of the engine. Due to the initial part tolerance and waterway cleanliness, the electronic water pump may occasionally block. However, due to the low rotating speed of the electronic water pump and the low driving torque of the electronic water pump, the electronic water pump cannot self-clear and recover after blocking, resulting in problems such as 0 rotating speed, ablation, fault code reporting, or engine water temperature rising, which affects normal driving of the vehicle.

[0045] Therefore, the application provides a troubleshooting method.

[0046] The embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0047] The application provides a troubleshooting method, which is applied to an electronic water pump controller and refers to Figure 1 , and comprises the following steps.

[0048] Step 102: obtaining engine operation information and electronic water pump operation information.

[0049] Specifically, the engine operation information is data generated by the engine in the running state. The engine operation information can include engine water temperature, engine speed and engine load, etc. The electronic water pump operation information is data generated by the electronic water pump in the running state. The electronic water pump operation information can include electronic water pump speed, electronic water pump voltage, electronic water pump current, electronic water pump temperature and electronic water pump water level, etc. The electronic water pump is usually equipped with a water level or pressure sensor for detecting the state of the water source. The sensor transmits the detected signal to the controller. The controller determines the current working state of the electronic water pump according to the signal returned by the sensor, such as whether the water level reaches the preset value, whether the pressure is too high, etc. The controller sends corresponding control signals to the electronic water pump according to the determination result, including starting or stopping the electronic water pump, adjusting the flow, pressure or speed of the electronic water pump, etc.

[0050] Step 104: determining whether the electronic water pump has a stall fault according to the engine operation information and / or the electronic water pump operation information.

[0051] Specifically, if the electronic water pump has a stall fault, the running state of the electronic water pump or the running state of the engine will change. The electronic water pump may have 0 speed or speed drop phenomenon, and may also cause the electronic water pump to be ablated when the stall is serious. Since the running state of the electronic water pump is abnormal, it will directly cause the engine cooling effect to decrease and the engine water temperature to rise. Therefore, the engine operation information and the electronic water pump operation information obtained in real time can accurately reflect whether the electronic water pump has a stall fault.

[0052] Step 106: in response to determining that there is a stall fault, increasing the electronic water pump speed to a preset speed and controlling the electronic water pump to run at the preset speed.

[0053] Specifically, in the case of determining that there is a stall fault, it is necessary to repair the stall fault to avoid affecting the normal operation of the subsequent electronic water pump. If the speed of the electronic water pump is low at this time, in order to improve the self-recovery ability of the water pump, the speed of the electronic water pump can be correspondingly increased to a preset speed. The preset speed is the lowest speed when the electronic water pump occurs stall due to initial part tolerance or waterway cleanliness, and the electronic water pump is recovered by increasing the flow rate. For example, the preset speed can be the highest speed of the electronic water pump. When the electronic water pump operates at the preset speed, the driving torque and flow rate of the electronic water pump increase correspondingly, the self-impact ability of the electronic water pump on the stall is improved, the stall fault can be effectively eliminated, manual maintenance is not required, and the probability of electronic water pump fault alarm is reduced.

[0054] Based on the above steps 102 to 106, the embodiment provides a fault elimination method, which comprises obtaining engine operation information and electronic water pump operation information, and determining whether the electronic water pump has a stall fault according to the engine operation information and / or the electronic water pump operation information. If the electronic water pump has a stall fault, indicating that the electronic water pump is abnormal, the operating state of the electronic water pump and the operating state of the engine will change, so the electronic water pump can be accurately determined whether the stall fault occurs according to the electronic water pump operation information and the engine operation information. In response to determining that there is a stall fault, the speed of the electronic water pump is increased to a preset speed, and the electronic water pump is controlled to operate at the preset speed. After the current speed of the electronic water pump is increased to the preset speed, the flow rate of the electronic water pump increases correspondingly. If the stall fault is caused by the initial part tolerance of the electronic water pump or the decrease of the waterway cleanliness, the electronic water pump can be recovered by increasing the flow rate, the stall problem at low speed can be eliminated, and the problems of electronic water pump ablation and engine water temperature rise during low-speed operation of the electronic water pump can be avoided. At the same time, increasing the speed of the electronic water pump to realize self-recovery of the electronic water pump can also reduce the frequency of electronic water pump alarm, thereby effectively reducing the number of manual maintenance and improving user satisfaction.

[0055] The method for determining whether the electronic water pump has a stall fault is described below through specific embodiments.

[0056] In some embodiments, the engine operation information comprises an engine water temperature, and the electronic water pump operation information comprises an actual speed of the electronic water pump; and the method for determining whether the electronic water pump has a stall fault according to the engine operation information and / or the electronic water pump operation information comprises:

[0057] In response to determining that the actual speed of the electronic water pump meets a preset speed abnormality condition and the engine water temperature exceeds a preset upper water temperature threshold, it is determined that the electronic water pump has a stall fault.

[0058] Specifically, if the electronic water pump has a stall failure, the rotation speed of the electronic water pump will be abnormal. In order to avoid misjudgment of the rotation speed abnormality caused by the fluctuation of the detection signal, the rotation speed abnormality condition is set in advance in the embodiment, and the rotation speed abnormality condition can accurately determine whether the rotation speed of the electronic water pump is abnormal. If it is determined that the rotation speed is abnormal, and at the same time the engine water temperature rises and exceeds the upper limit threshold of the water temperature, it is determined that the electronic water pump abnormality causes the engine heat dissipation efficiency to be poor, and it is determined that the electronic water pump has a stall failure. The upper limit threshold of the water temperature is slightly lower than the highest balanced water temperature of the engine. For example, the highest balanced water temperature of the engine is 115℃, and the upper limit threshold of the water temperature can be 102℃. The reasonable setting of the upper limit threshold of the water temperature can take fault elimination measures before the engine water temperature reaches the highest balanced water temperature, so as to clear the electronic water pump stall and restore the heat dissipation capacity of the electronic water pump to the engine, avoiding damage to the electronic water pump and the engine. In the embodiment, after the rotation speed of the electronic water pump is abnormal and the engine water temperature exceeds the preset upper limit threshold of the water temperature, it is determined that the electronic water pump has a stall failure, which can not only accurately determine the stall failure, but also avoid the problem of misjudgment of the stall failure.

[0059] It should be noted that if the electronic water pump is not equipped with a rotation speed sensor and cannot detect the actual rotation speed of the electronic water pump, the electronic water pump can be determined to have a stall failure only according to the engine water temperature. The specific determination method is: if the engine water temperature exceeds the preset upper limit threshold of the water temperature, it is determined that the electronic water pump has a stall failure. However, since there are many factors that cause the engine water temperature to rise, it may not be accurate to determine whether the electronic water pump has a stall failure only according to the engine water temperature. Therefore, in the case where the actual rotation speed of the electronic water pump can be detected, it is preferred to determine whether the electronic water pump has a stall failure by combining the actual rotation speed of the electronic water pump and the engine water temperature. This can effectively avoid the problem of misjudgment of the engine stall failure.

[0060] On the basis of the foregoing embodiments, the method for determining whether the actual rotation speed of the electronic water pump meets the preset rotation speed abnormality condition is described in the following specific embodiments.

[0061] In some embodiments, the electronic water pump operation information includes an electronic water pump target rotation speed;

[0062] The determination that the actual rotation speed of the electronic water pump meets the preset rotation speed abnormality condition includes:

[0063] In response to the difference between the electronic water pump target rotating speed and the electronic water pump actual rotating speed being greater than a first preset difference threshold, it is determined that the electronic water pump actual rotating speed meets a preset rotating speed abnormality condition; wherein the electronic water pump target rotating speed is determined according to the engine rotating speed, the engine load and a first preset relationship; in the first preset relationship, when the engine rotating speed is constant, the electronic water pump target rotating speed is positively correlated with the engine load; when the engine load is constant, the electronic water pump target rotating speed is positively correlated with the engine rotating speed.

[0064] Specifically, the engine controller sends the target rotating speed to the electronic water pump controller, and the electronic water pump controller controls the electronic water pump to operate at the target rotating speed, but due to some external factors, the actual rotating speed of the electronic water pump is not equal to the target rotating speed, but some fluctuations occur. Within the normal fluctuation range of the rotating speed, the difference between the target rotating speed and the actual rotating speed of the electronic water pump is small, and it can be regarded as normal operation of the electronic water pump. However, when the difference between the target rotating speed and the actual rotating speed of the electronic water pump is greater than the first preset difference threshold, it indicates that the difference between the actual rotating speed of the electronic water pump and the target rotating speed is large, which is not within the normal rotating speed fluctuation range, and the electronic water pump operation is abnormal, at this time it is determined that the actual rotating speed of the electronic water pump meets the preset rotating speed abnormality condition. For example, the actual rotating speed of the electronic water pump is denoted as n2, the target rotating speed is denoted as n1, and if n1-n2>10rpm, it is determined that the actual rotating speed of the electronic water pump meets the preset rotating speed abnormality condition, wherein the first preset difference threshold is 10rpm.

[0065] Since the rotating speed of the electronic water pump is dynamically changed according to the heat dissipation demand of the engine, the target rotating speed of the electronic water pump is also dynamically changed. The controller of the engine determines the target rotating speed according to the engine rotating speed, the engine load and the first preset relationship, and then sends the target rotating speed to the controller of the electronic water pump. In specific implementation, in the first preset relationship, the corresponding relationship among the engine rotating speed, the engine load and the target rotating speed of the electronic water pump is calibrated. After the engine rotating speed and the engine load are determined, a unique target rotating speed can be matched in the first preset relationship. The target rotating speed is the demand rotating speed of the electronic water pump in the normal operating state.

[0066] When the engine rotating speed is constant, the target rotating speed is positively correlated with the engine load, that is, the greater the engine load, the greater the target rotating speed. The greater the engine load, the greater the heat dissipation demand of the engine, and therefore the greater the target rotating speed. When the engine load is constant, the target rotating speed is positively correlated with the engine rotating speed, that is, the greater the engine rotating speed, the greater the target rotating speed. The greater the engine rotating speed, the greater the heat dissipation demand of the engine, and therefore the greater the target rotating speed.

[0067] In addition, in the first preset relationship, a corresponding relationship among the engine speed, the engine load and the target duty cycle of the electronic water pump can be calibrated. After the engine speed and the engine load are determined, a unique target duty cycle can be matched in the first preset relationship. The target duty cycle is the duty cycle of the electronic water pump in a normal operating state. When the engine speed is constant, the target duty cycle is positively correlated with the engine load, that is, the greater the engine load, the greater the target duty cycle. The greater the engine load, the greater the heat dissipation demand of the engine, and therefore, the greater the target duty cycle, the faster the speed of the electronic water pump. When the engine load is constant, the target duty cycle is positively correlated with the engine speed, that is, the greater the engine speed, the greater the target duty cycle. The greater the engine speed, the greater the heat dissipation demand of the engine, and therefore, the greater the target duty cycle, the faster the speed of the electronic water pump. After the target duty cycle is queried, the product of the maximum speed of the electronic water pump and the target duty cycle is the target speed of the electronic water pump.

[0068] For example, the engine load can be a relative charge amount rl in the engine cylinder, and the relative charge amount rl is calculated as follows:

[0069]

[0070] wherein m_luft_br represents the gas mass in the combustion chamber, m_norm represents the gas mass in the combustion chamber under standard conditions, p_luft_dr represents the gas pressure in the combustion chamber, P0 represents the gas pressure under standard conditions, P0 = 1013 hPa, T0 represents the air temperature under standard conditions, T0 = 273 K, T br represents the air temperature before the combustion chamber.

[0071] By the method of the embodiment, a rapid determination method of the target speed is given, and then the electronic water pump can be rapidly determined whether there is a speed abnormality problem according to the target speed and the actual speed of the electronic water pump, which is beneficial to the timely discovery of the electronic water pump abnormality and the rapid elimination of the subsequent locked-rotor failure.

[0072] In addition to determining whether the electronic water pump has a locked-rotor failure through the actual speed of the electronic water pump and the engine temperature, whether the electronic water pump has a locked-rotor failure can also be determined through the current of the electronic water pump, which will be described below through specific embodiments.

[0073] In some embodiments, the electronic water pump operating information includes an electronic water pump target speed and an electronic water pump actual current;

[0074] The determination of whether the electronic water pump has a locked-rotor failure according to the engine operating information and / or the electronic water pump operating information includes:

[0075] determining an electronic water pump target current according to the electronic water pump target speed and a third preset relationship;

[0076] In response to a difference between the actual current of the electric water pump and the target current of the electric water pump being greater than a second preset difference threshold, it is determined that the electric water pump has a stall fault.

[0077] Specifically, the electric water pump generates a corresponding current when it operates at a certain speed. If the current of the electric water pump is abnormal, it can reflect that the speed of the electric water pump is abnormal to a certain extent. When the electric water pump stalls, the current will rise to a certain extent. In order to facilitate the query of the target current corresponding to the target speed, the correspondence between the target speed of the electric water pump and the target current of the electric water pump can be pre-calibrated in the third preset relationship. Generally, when the load of the electric water pump is constant, the target current increases with the increase of the target speed.

[0078] The target speed of the electric water pump and the actual current of the electric water pump are determined, and the target current is queried based on the target speed in the third preset relationship. The actual current of the electric water pump is compared with the target current. If the difference between the actual current of the electric water pump and the target current is greater than the second preset difference threshold, it indicates that the difference between the actual current of the electric water pump and the target current is large, the current of the electric water pump appears abnormal rising trend, and it is determined that the electric water pump has a stall fault. The second preset difference threshold can be determined according to the rated power and actual demand of the electric water pump, which is not limited in the embodiment. The embodiment gives a method for determining whether the electric water pump has a stall fault according to the current of the electric water pump. The embodiment provides an additional judgment method for determining the stall fault, and enriches the judgment basis of the stall fault. In addition, when determining whether the electric water pump has a stall fault, different judgment methods can be used to verify each other to further reduce the probability of misjudgment.

[0079] After the electric water pump is controlled to operate at a preset speed, it is still necessary to continue to monitor whether the heat dissipation effect of the engine is improved. If it is not improved, further cooling measures need to be taken to ensure that the engine will not be damaged. The following will be illustrated by specific embodiments.

[0080] In some embodiments, the method further comprises:

[0081] Within a preset time length during which the electric water pump operates at the preset speed, in response to a change rate of the engine water temperature being greater than a preset change rate threshold, the engine load is reduced.

[0082] Specifically, after the speed of the electronic water pump is increased from the current speed to the preset speed, the electronic water pump operates for a preset time. Within the preset time, if the engine water temperature change rate is greater than the preset change rate threshold, it indicates that the engine water temperature is in a gradually rising state. Among them, the preset change rate threshold is a value greater than zero, such as the preset change rate threshold is 0.5. The preset time can be 5s. If the engine water temperature gradually rises, it means that the heat dissipation effect of the electronic water pump has not been improved, and the problem of engine water temperature overheating cannot be improved by simply increasing the speed of the electronic water pump. At this time, in order to protect the engine, it is necessary to further reduce the engine load to solve the problem of rising engine water temperature, achieve a rapid drop in engine water temperature, and avoid safety hazards caused by engine overheating.

[0083] Further, reduce engine load, including:

[0084] A target load percentage limit of the engine is determined based on the engine water temperature and a second preset relationship, and the engine is controlled to operate according to the target load percentage limit; in the second preset relationship, the engine water temperature and the target load percentage limit are positively correlated.

[0085] Specifically, when reducing engine load, the engine load is adjusted based on the real-time engine water temperature. In the second preset relationship, a correspondence is calibrated between the engine water temperature and the target load limit percentage. The target load limit percentage represents the engine load limit. For example, if the target load limit percentage is 20%, the engine load is limited to 20% of the maximum load, and the upper limit of the engine load is adjusted to 80% of the maximum load, which means that the upper limit of the engine output torque is 80% of the maximum output torque. Higher engine water temperature indicates greater engine cooling requirements, and thus a higher target load limit percentage. Table 1 below shows the calibrated values ​​in the second preset relationship. When the engine water temperature is 114°C, the target load limit percentage is 0%. As the engine water temperature gradually increases, the target load limit percentage gradually increases. When the engine water temperature reaches 120°C, the target load limit percentage increases to 70%. In this embodiment, the engine load limit is controlled to decrease in a gradient based on the engine water temperature. This achieves dynamic adjustment of the engine load limit based on the engine water temperature, thereby lowering the engine water temperature, maintaining engine operation within a safe range, and avoiding excessive reduction of the engine load limit, which could cause the vehicle to become unable to operate normally.

[0086] Table 1 Second preset relationship

[0087]

[0088] It should be noted that when the target limit load percentage is adjusted, the user can also be prompted that the electronic water pump operation is abnormal through the instrument fault light, and timely maintenance is required to avoid causing vehicle driving safety problems.

[0089] After the electronic water pump operates at the preset speed, if the engine water temperature decreases, the speed of the electronic water pump in the normal state can be restored. The following will be described through specific embodiments.

[0090] In some embodiments, after controlling the electronic water pump to operate at the preset speed, the method further comprises: in response to the real-time acquired engine water temperature being less than a preset lower water temperature threshold, controlling the electronic water pump to operate at the target speed of the electronic water pump.

[0091] Specifically, after the electronic water pump operates at the preset speed, if the engine water temperature decreases and decreases to below the preset lower water temperature threshold, it indicates that the heat dissipation effect of the electronic water pump is improved, and the stall fault is effectively ruled out. In order to control the engine water temperature within a reasonable range and avoid the phenomenon of too low engine water temperature, the speed of the electronic water pump needs to be adjusted at this time, and the speed of the electronic water pump is adjusted from the preset speed to the target speed.

[0092] The target speed is the required speed of the electronic water pump in the normal operating state. The target speed is determined by the engine controller according to the engine speed, the engine load, and a first preset relationship. In the first preset relationship, the corresponding relationship among the engine speed, the engine load, and the target speed of the electronic water pump is calibrated. In the first preset relationship, when the engine speed is constant, the target speed of the electronic water pump is positively correlated with the engine load. When the engine load is constant, the target speed of the electronic water pump is positively correlated with the engine speed.

[0093] Through the method of the embodiment, after it is determined that the engine water temperature decreases to the preset lower water temperature threshold, the electronic water pump operates normally, and the speed of the electronic water pump is adjusted to the target speed, the power consumption of the electronic water pump can be reduced, and the engine water temperature can be prevented from being too low.

[0094] The foregoing embodiments are all corresponding measures taken in the case where the speed of the electronic water pump is abnormal. The present application also proposes a method for taking a stall impact strategy in advance in the case where the speed of the electronic water pump is not abnormal, so as to avoid or reduce the probability of the speed of the electronic water pump being abnormal. The following will be described through specific embodiments.

[0095] In some embodiments, the engine operation information includes the engine water temperature; and the method further comprises:

[0096] In response to the engine water temperature being within a preset water temperature range, determining a stall impact frequency corresponding to the preset water temperature range;

[0097] The electronic water pump is controlled to operate at the preset rotating speed according to the preset stall impact frequency.

[0098] Specifically, in order to prevent the electronic water pump from causing abnormal rotating speed due to initial component tolerance or circuit cleanliness reduction, the engine water temperature can be monitored in real time. If the engine water temperature is within a preset water temperature range, the electronic water pump can be controlled to operate at a preset rotating speed according to a certain stall impact frequency, so as to reduce the probability of gradual increase of the engine water temperature. In specific implementation, the corresponding relationship between the water temperature range and the stall impact frequency can be calibrated in advance. For example, when the water temperature range is 100℃-102℃, the corresponding stall impact frequency is 1 time / 30min, and the stall impact duration can be 60s. That is, when the engine water temperature is monitored to be within 100℃-102℃, the rotating speed of the electronic water pump is increased to the preset rotating speed once every 30min, and the operation is maintained for 60s, so as to eliminate the risk of electronic water pump stall. Then, the rotating speed of the electronic water pump is adjusted to the target rotating speed. With the increase of the water temperature range, the corresponding stall impact frequency gradually increases. For example, when the water temperature range is 105℃-107℃, the corresponding stall impact frequency is adjusted to 1 time / 20min.

[0099] In another specific embodiment, in view of the fact that the electronic water pump is prone to stall at low speed, the stall impact frequency can also be determined according to the rotating speed of the electronic water pump. In response to the actual rotating speed of the electronic water pump being within a preset rotating speed range, the stall impact frequency corresponding to the preset rotating speed range is determined, and the electronic water pump is controlled to operate at the preset rotating speed according to the stall impact frequency, so as to reduce the probability of gradual increase of the engine water temperature.

[0100] In specific implementation, the corresponding relationship between the rotating speed range and the stall impact frequency can be calibrated in advance. For example, when the rotating speed range is 500rpm-1000rpm, the corresponding stall impact frequency is 1 time / 20min, and the stall impact duration can be 60s. That is, when the rotating speed of the electronic water pump is monitored to be within 500rpm-1000rpm, the rotating speed of the electronic water pump is increased to the preset rotating speed once every 20min, and the operation is maintained for 60s, so as to eliminate the risk of electronic water pump stall. Then, the rotating speed of the electronic water pump is restored to the target rotating speed. With the increase of the rotating speed of the electronic water pump, the corresponding stall impact frequency gradually decreases. For example, when the rotating speed range is 1001rpm-1500rpm, the corresponding stall impact frequency is adjusted to 1 time / 30min. That is, when the rotating speed of the electronic water pump is monitored to be within 1001rpm-1500rpm, the rotating speed of the electronic water pump is increased to the preset rotating speed once every 30min, and the operation is maintained for 60s, so as to eliminate the risk of electronic water pump stall. Then, the rotating speed of the electronic water pump is restored to the target rotating speed.

[0101] The embodiment provides a method for preventing or reducing the abnormal rotation speed of the electronic water pump, so that the stall impact strategy can be taken before the electronic water pump has the abnormal rotation speed, the probability of the subsequent electronic water pump having the abnormal rotation speed is effectively reduced, and user satisfaction is improved.

[0102] It should be noted that the method of the embodiments of the present application can be executed by a single device, such as a computer or a server. The method of the embodiments of the present application can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In this distributed scenario, one of the multiple devices can only execute one or more steps in the method of the embodiments of the present application, and the multiple devices can interact with each other to complete the method.

[0103] It should be noted that some embodiments of the present application have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than the order described above and still achieve the desired results. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0104] Based on the same inventive concept, the present application also provides a troubleshooting device corresponding to any of the above-mentioned embodiment methods.

[0105] Reference Figure 2 , the troubleshooting device comprises:

[0106] The acquisition module 202 is configured to acquire engine operation information and electronic water pump operation information;

[0107] The determination module 204 is configured to determine whether the electronic water pump has a stall fault according to the engine operation information and / or the electronic water pump operation information.

[0108] The control module 206 is configured to, in response to determining that there is a stall fault, increase the rotation speed of the electronic water pump to a preset rotation speed, and control the electronic water pump to operate at the preset rotation speed.

[0109] In some embodiments, the engine operation information includes engine water temperature, and the electronic water pump operation information includes actual rotation speed of the electronic water pump; the determination module 204 is configured to, in response to determining that the actual rotation speed of the electronic water pump meets a preset rotation speed abnormality condition and the engine water temperature exceeds a preset upper water temperature threshold, determine that the electronic water pump has a stall fault.

[0110] In some embodiments, the electronic water pump operating information comprises an electronic water pump target rotating speed; the determining module 204 is configured to determine that the electronic water pump actual rotating speed satisfies a preset rotating speed abnormality condition in response to a difference between the electronic water pump target rotating speed and the electronic water pump actual rotating speed being greater than a first preset difference threshold; wherein the electronic water pump target rotating speed is determined according to an engine rotating speed, an engine load and a first preset relationship; in the first preset relationship, when the engine rotating speed is constant, the electronic water pump target rotating speed is positively correlated with the engine load; when the engine load is constant, the electronic water pump target rotating speed is positively correlated with the engine rotating speed.

[0111] In some embodiments, the control module 206 is further configured to, within a preset time length during which the electronic water pump operates at the preset rotating speed, reduce the engine load in response to a variation rate of the engine water temperature being greater than a preset variation rate threshold.

[0112] In some embodiments, the control module 206 is further configured to determine a target limit load percentage of the engine based on the engine water temperature and a second preset relationship, and control the engine to operate according to the target limit load percentage; in the second preset relationship, the engine water temperature is positively correlated with the target limit load percentage.

[0113] In some embodiments, after controlling the electronic water pump to operate at the preset rotating speed, the control module 206 is further configured to control the electronic water pump to operate at the electronic water pump target rotating speed in response to the engine water temperature acquired in real time being less than a preset water temperature lower threshold.

[0114] In some embodiments, the engine operating information comprises an engine water temperature; the control module 206 is further configured to determine a stall impact frequency corresponding to a preset water temperature range in response to the engine water temperature being located in the preset water temperature range, and control the electronic water pump to operate at the preset rotating speed at the stall impact frequency.

[0115] In some embodiments, the electronic water pump operating information comprises an electronic water pump target rotating speed and an electronic water pump actual current; the determining module 204 is further configured to determine an electronic water pump target current according to the electronic water pump target rotating speed and a third preset relationship, and determine that the electronic water pump has a stall fault in response to a difference between the electronic water pump actual current and the electronic water pump target current being greater than a second preset difference threshold.

[0116] For the convenience of description, the above apparatus is described in various modules in terms of functions. Of course, the functions of the modules can be implemented in one or more software and / or hardware in the implementation of the present application.

[0117] The device of the above embodiment is used to implement the corresponding troubleshooting method in any of the preceding embodiments, and has the beneficial effects of the corresponding method embodiments, which are not repeated here.

[0118] Based on the same inventive concept, the present application also provides an electronic device corresponding to the method of any of the above embodiments, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the troubleshooting method of any of the above embodiments when executing the program.

[0119] Figure 3 A more specific hardware structure of an electronic device is shown in the embodiment, which can include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040 are connected to each other through the bus 1050 for communication within the device.

[0120] The processor 1010 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits, etc., for executing related programs to implement the technical solutions provided by the embodiments of the present application.

[0121] The memory 1020 can be implemented by a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 1020 can store an operating system and other application programs, and when the technical solutions provided by the embodiments of the present application are implemented by software or firmware, the related program codes are stored in the memory 1020 and executed by the processor 1010.

[0122] The input / output interface 1030 is used to connect input / output modules to realize information input and output. The input / output modules can be configured as components in the device (not shown in the figure) or externally connected to the device to provide corresponding functions. The input device can include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device can include a display, a speaker, a vibrator, an indicator light, etc.

[0123] The communication interface 1040 is configured to connect a communication module (not shown in the figure) to realize the communication interaction between the device and other devices. The communication module can realize communication through wired mode (such as USB, network cable, etc.), or can realize communication through wireless mode (such as mobile network, WIFI, Bluetooth, etc.).

[0124] The bus 1050 includes a path for transmitting information between various components (such as the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040) of the device.

[0125] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in the specific implementation process, the device can also include other components necessary for normal operation. In addition, those skilled in the art can understand that the above device can also only contain the components necessary for the implementation of the embodiments of the present application, and does not have to contain all the components shown in the figure.

[0126] The electronic device of the above embodiment is used to implement the corresponding troubleshooting method in any of the preceding embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described here.

[0127] Based on the same inventive concept, corresponding to any of the above embodiment methods, the present application also provides a non-transitory computer readable storage medium, which stores computer instructions for causing the computer to execute the troubleshooting method according to any of the above embodiments.

[0128] The computer readable medium of the present embodiment includes permanent and non-permanent, removable and non-removable media, which can be realized by any method or technology to store information. The information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0129] The storage medium of the above embodiments stores computer instructions for causing the computer to execute the troubleshooting method as described in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which are not repeated here.

[0130] Based on the same concept, corresponding to the method of any of the above embodiments, the present application also provides a computer program product, comprising computer program instructions, when the computer program instructions run on a computer, causing the computer to execute the method as described in any of the above embodiments, having the beneficial effects of the corresponding method embodiments, which are not repeated here.

[0131] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope of the present application is limited to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0132] In addition, in order to simplify the description and discussion, and so as not to make the embodiments of the present application difficult to understand, the known power / ground connections of integrated circuit (IC) chips and other components can or can not be shown in the provided drawings. In addition, devices can be shown in the form of block diagrams in order to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (i.e. these details should be fully within the understanding of those skilled in the art). Where specific details (e.g. circuits) are set forth in order to describe an exemplary embodiment of the present application, it will be apparent to those skilled in the art that the present application can be practiced without these specific details or with variations of these specific details. Therefore, these descriptions should be considered as illustrative rather than limiting.

[0133] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g. dynamic RAM (DRAM)) can use the embodiments discussed.

[0134] The embodiments of the present application are intended to cover all such alternatives, modifications and variations as falling within the broad scope of the present application. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A troubleshooting method, characterized in that: include: Acquiring engine operating information and electronic water pump operating information; the engine operating information includes engine water temperature; determining whether the electronic water pump has a stall fault according to the engine operating information and / or the electronic water pump operating information; In response to determining that a stall fault exists, increasing the speed of the electronic water pump to a preset speed, and controlling the electronic water pump to operate at the preset speed; In response to the engine water temperature being within a preset water temperature range, determining a stall impact frequency corresponding to the preset water temperature range; The electronic water pump is controlled to operate at the preset speed according to the stall impact frequency.

2. The method according to claim 1, characterized in that The engine operation information includes the engine water temperature, and the electronic water pump operation information includes the actual speed of the electronic water pump; and determining whether the electronic water pump has a stall fault based on the engine operation information and / or the electronic water pump operation information includes: In response to determining that the actual speed of the electronic water pump meets a preset speed abnormality condition and the engine water temperature exceeds a preset water temperature upper limit threshold, it is determined that the electronic water pump has a stall fault.

3. The method according to claim 2, characterized in that The electronic water pump operation information includes the electronic water pump target speed; The determining whether the actual speed of the electronic water pump meets a preset speed abnormality condition includes: In response to the difference between the electronic water pump target speed and the actual speed of the electronic water pump being greater than a first preset difference threshold, it is determined that the actual speed of the electronic water pump meets the preset speed abnormality condition; wherein, the electronic water pump target speed is determined based on the engine speed, the engine load and a first preset relationship; in the first preset relationship, when the engine speed is constant, the electronic water pump target speed is positively correlated with the engine load; when the engine load is constant, the electronic water pump target speed is positively correlated with the engine speed.

4. The method according to claim 2, characterized in that The method further comprises: During the preset time period when the electronic water pump operates at the preset speed, in response to the change rate of the engine water temperature being greater than a preset change rate threshold, the engine load is reduced.

5. The method according to claim 4, characterized in that The reducing the engine load includes: A target load percentage limit of the engine is determined based on the engine water temperature and a second preset relationship, and the engine is controlled to operate according to the target load percentage limit; in the second preset relationship, the engine water temperature and the target load percentage limit are positively correlated.

6. The method according to claim 3, characterized in that After controlling the electronic water pump to operate at the preset speed, the method further includes: In response to the engine water temperature acquired in real time being less than a preset water temperature lower limit threshold, the electronic water pump is controlled to operate according to the electronic water pump target speed.

7. The method according to claim 1, characterized in that The electronic water pump operation information includes the electronic water pump target speed and the electronic water pump actual current; The determining whether the electronic water pump has a stall fault according to the engine operating information and / or the electronic water pump operating information includes: determining a target current of the electronic water pump according to the target speed of the electronic water pump and a third preset relationship; In response to a difference between the actual current of the electronic water pump and the target current of the electronic water pump being greater than a second preset difference threshold, it is determined that a stall fault occurs in the electronic water pump.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 7 is implemented.

9. A vehicle, characterized in that: The vehicle includes the electronic device according to claim 8.

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