Rotating speed diagnosis method and equipment for electronic water pump of extended-range engine and storage medium

Abstract

The invention discloses a rotating speed diagnosis method and device for an electronic water pump of an extended-range engine and a storage medium, and the method comprises the steps that when an engine controller judges that a reference value at the (Y + t) th moment is located in a preset threshold value interval, the engine controller also judges whether the reference value at the (Y-1) th moment is not located in the preset threshold value interval or not; the reference value from the Yth moment to the (Y + t) th moment is in a preset threshold interval; and if yes, the engine controller reports fault information to the whole vehicle controller according to the reference value at the Yth moment. By judging that the reference values from the Yth moment to the (Y + t) th moment are all located in the preset threshold interval, it is determined that the electronic water pump always breaks down within the time period from the Yth moment to the (Y + t) th moment, so that the reliability of reporting the fault information to the vehicle control unit is higher, and the situation that the fault of the electronic water pump is misjudged is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of extended-range vehicles, and more specifically, to a rotation speed diagnosis method, device and storage medium for an electronic water pump of an extended-range engine. Background Art

[0002] In the extended-range hybrid models currently on the market, the electronic water pump has been used as a common engine thermal management technology solution. The speed control method of the electronic water pump is open-loop. The engine controller (Electronic Control Unit, ECU) sends a target speed request or a duty cycle request with target speed information to the electronic water pump. The electronic water pump executes the request response and outputs the speed of the electronic water pump. However, there is a deviation between the actual operating speed of the electronic water pump and the target speed sent by the engine controller, so it is very necessary to add a diagnostic method for the speed of the electronic water pump.

[0003] In the prior art, an invention patent with application publication number CN116906168A discloses a hybrid power system based on a P1 configuration and an electronic water pump control method, including: step 2: calculating the target speed of the electronic water pump under different vehicle states; step 3: sending the calculated target speed to the water pump controller of the electronic water pump; step 4: the water pump controller controls the electronic water pump to switch states according to the received target speed; step 5: obtaining the actual speed of the electronic water pump; step 6: comparing the actual speed of the electronic water pump with the set target speed; step 7: defining the fault level of the electronic water pump according to the comparison result.

[0004] Although the prior art discloses a method for comparing the actual speed of an electronic water pump with a set target speed to diagnose the speed of the electronic water pump, if there is an error in the actual speed of the electronic water pump obtained, it may cause the electronic water pump to be judged as faulty when it is not faulty. Therefore, it is necessary to provide a more reliable method for diagnosing the speed of an electronic water pump.

[0005] In view of this, the present invention provides a rotation speed diagnosis method, device and storage medium for an electronic water pump of an extended-range engine. Summary of the invention

[0006] In view of this, the present invention provides a rotation speed diagnosis method, device and storage medium for an electronic water pump of an extended-range engine.

[0007] In one aspect, the present invention provides a method for diagnosing the rotation speed of an electronic water pump of a range-extended engine, comprising:

[0008] The engine controller calculates the target speed at the Tth moment according to the engine's operating water temperature at the Tth moment, the speed at the Tth moment, and the load at the Tth moment, and transmits the result to the electronic water pump, where T is a positive number; the engine controller obtains the actual speed at the Tth moment when the electronic water pump executes the target speed at the Tth moment, calculates the absolute value of the difference between the target speed at the Tth moment and the actual speed at the Tth moment as the reference value at the Tth moment, determines whether the reference value at the Tth moment is within a preset threshold interval, and records the difference;

[0009] When the engine controller determines that the reference value at the Y+tth moment is within the preset threshold interval, the engine controller further determines whether the reference value at the Y-1th moment is not within the preset threshold interval, and the reference value from the Yth moment to the Y+tth moment are all within the preset threshold interval, Y is a positive number, t is the delay time and t is a positive number, and Y+t is less than or equal to the maximum value of the T value range;

[0010] If it is satisfied, the engine controller reports the fault information to the vehicle controller according to the reference value at the Yth moment.

[0011] Optionally, the engine controller reports fault information to the vehicle controller according to the reference value at the Yth moment, including:

[0012] The preset threshold interval includes an alarm threshold interval and a shutdown threshold interval, and the alarm threshold interval does not overlap with the shutdown threshold interval;

[0013] If the engine controller determines that the reference value at the Yth moment is within the warning threshold range, reporting the warning fault information to the vehicle controller;

[0014] If the engine controller determines that the reference value at the Yth moment is within the shutdown threshold range, the shutdown fault information is reported to the vehicle controller.

[0015] Optionally, the engine controller calculates the target speed at time T according to the engine's operating water temperature at time T, the speed at time T, and the load at time T, including:

[0016] The engine controller stores a database; the operating water temperature, speed, load and calibration values ​​of the engine in the database are stored in association with each other;

[0017] The engine controller acquires the associated target calibration value from the database according to the operating water temperature of the engine at the Tth moment, the speed at the Tth moment, and the load at the Tth moment;

[0018] The target speed at the time T is calculated according to the parameter information of the electronic water pump and the target calibration value.

[0019] Optionally, the calculating the target speed at the Tth moment according to the parameter information of the electronic water pump and the target calibration value includes:

[0020] The parameter information includes a maximum rotational speed, and the maximum rotational speed is multiplied by the target calibration value and then divided by 100 to obtain the target rotational speed at the Tth moment.

[0021] Optionally, the delay duration is determined according to the target speed at the Y+tth moment, and the delay duration is negatively correlated with the target speed at the Y+tth moment;

[0022] Alternatively, the delay duration is determined according to the speed of the engine at the Y+tth moment, and the delay duration is negatively correlated with the speed at the Y+tth moment.

[0023] Optionally, the engine controller obtains the real speed at the Tth moment when the electronic water pump executes the target speed at the Tth moment, including:

[0024] When the electronic water pump executes the target speed at the Tth moment, a back electromotive force at the Tth moment is generated;

[0025] The engine controller obtains the back electromotive force at the Tth moment, and calculates the real speed at the Tth moment according to the back electromotive force at the Tth moment and the back electromotive force constant.

[0026] Optionally, after reporting the warning fault information to the vehicle controller, the method further comprises:

[0027] The vehicle controller receives the warning fault information, reduces the power generation power of the range extender and sends a warning prompt to the display screen, and the display screen receives the warning prompt for display;

[0028] The reporting of shutdown fault information to the vehicle controller includes:

[0029] The vehicle controller receives the shutdown fault information, controls the range extender to shut down and sends a fault prompt to the display screen, and the display screen receives the fault prompt for display.

[0030] Optionally, the alarm threshold interval is 500 rpm to 1000 rpm;

[0031] The shutdown threshold interval is greater than 1000 revolutions per minute.

[0032] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the electronic device implements any of the above-mentioned methods for diagnosing the speed of an electronic water pump of an extended-range engine.

[0033] In yet another aspect, the present invention further provides a storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the speed diagnosis method for the electronic water pump of a range-extended engine as described in any one of the above items is implemented.

[0034] Compared with the prior art, the speed diagnosis method, device and storage medium of the range-extended engine electronic water pump provided by the present invention achieve at least the following beneficial effects:

[0035] The speed diagnosis method, device and storage medium of the electronic water pump of the extended-range engine provided by the present invention include: when the engine controller determines that the reference value at the Y+t moment is within the preset threshold interval, the engine controller also determines whether the reference value at the Y-1 moment is not within the preset threshold interval, and the reference value at the Y moment to the Y+t moment are all within the preset threshold interval; if satisfied, the engine controller reports fault information to the vehicle controller according to the reference value at the Y moment. By determining that the reference values ​​from the Y moment to the Y+t moment are all within the preset threshold interval, it is determined that the electronic water pump has always been faulty during the time period from the Y moment to the Y+t moment, and based on this, the reliability of reporting fault information to the vehicle controller is higher, avoiding the situation of misjudgment of the electronic water pump fault.

[0036] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0037] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0039] Figure 1 It is a flow chart of a method for diagnosing the rotation speed of an electronic water pump of a range-extended engine provided by the present invention;

[0040] Figure 2 It is another flow chart of the rotation speed diagnosis method of the electronic water pump of the range-extended engine provided by the present invention. DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0042] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0043] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0044] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0045] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] Example 1

[0047] Reference Figure 1 , Figure 1 The figure is a flow chart of a method for diagnosing the rotation speed of an electronic water pump of a range-extended engine provided by the present invention, and is used to illustrate a specific embodiment of the method for diagnosing the rotation speed of an electronic water pump of a range-extended engine provided by the present invention, including:

[0048] S101: The engine controller calculates the target speed at time T according to the engine's operating water temperature at time T, the speed at time T, and the load at time T, and transmits the result to the electronic water pump, where T is a positive number; the engine controller obtains the actual speed at time T when the electronic water pump executes the target speed at time T, calculates the absolute value of the difference between the target speed at time T and the actual speed at time T as a reference value at time T, determines whether the reference value at time T is within a preset threshold range, and records the difference;

[0049] S102: When the engine controller determines that the reference value at time Y+t is within the preset threshold interval, the engine controller further determines whether the reference value at time Y-1 is not within the preset threshold interval, and the reference value from time Y to time Y+t are all within the preset threshold interval, Y is a positive number, t is the delay time and t is a positive number, and Y+t is less than or equal to the maximum value of the T value range;

[0050] S1021: If satisfied, the engine controller reports the fault information to the vehicle control unit (VCU) according to the reference value at the Yth moment.

[0051] It should be noted that step S101 indicates that the engine controller obtains the reference value in real time and determines in real time whether the current moment is within the preset threshold interval. In step S101, after the engine controller calculates the target speed at the Tth moment, the target speed at the Tth moment is directly transmitted to the control chip of the electronic water pump, and the control chip of the electronic water pump receives and executes the target speed at the Tth moment. Of course, the target speed at the Tth moment can also be converted into a duty cycle carrying the target speed information at the Tth moment and sent to the control chip of the electronic water pump, and the control chip of the electronic water pump receives and executes the duty cycle. This embodiment does not impose specific restrictions on the type of data transmitted by the engine controller to the control chip of the electronic water pump, and can enable the control chip of the electronic water pump to operate with the target speed at the Tth moment as the target. Step S102 also includes step S1022: if not satisfied, determine whether the reference value at the Y+t+1th moment is within the preset threshold interval and record it. When the engine controller determines that the reference value at the Y+t+1th moment is within the preset threshold interval, the engine controller also determines whether the reference value at the Yth moment is not within the preset threshold interval, and the reference value from the Y+1th moment to the Y+t+1th moment are all within the preset threshold interval, and Y+t+1 is less than or equal to the maximum value of the T value range, that is, each time the engine controller determines that it is not satisfied, it performs a reference value judgment at the next moment. When the reference value at the next moment is within the preset threshold interval, it determines whether each reference value obtained within the t time period before the next moment is within the preset threshold interval.

[0052] It is understandable that when the engine controller determines that the reference value at time Y+t is within the preset threshold interval, the engine controller also determines whether the reference value at time Y-1 is not within the preset threshold interval, and the reference value from time Y to time Y+t are all within the preset threshold interval; if so, the engine controller reports the fault information to the vehicle controller according to the reference value at time Y. By determining that the reference values ​​from time Y to time Y+t are all within the preset threshold interval, it is determined that within the t time period from the time when the reference value is within the preset threshold interval, each reference value obtained is within the preset threshold interval, reflecting that the electronic water pump has been faulty within the t time period, ensuring the continuity of the fault, and based on this, the reliability of reporting the fault information to the vehicle controller is higher, avoiding the misjudgment of the electronic water pump fault.

[0053] Example 2

[0054] Reference Figure 1 and Figure 2 , Figure 2 1 is another flow chart of the speed diagnosis method of the electronic water pump of the range-extended engine provided by the present invention, to illustrate a specific embodiment of the speed diagnosis method of the electronic water pump of the range-extended engine provided by the present invention, including:

[0055] S101: The engine controller calculates the target speed at time T according to the engine's operating water temperature at time T, the speed at time T, and the load at time T, and transmits the result to the electronic water pump, where T is a positive number; the engine controller obtains the actual speed at time T when the electronic water pump executes the target speed at time T, calculates the absolute value of the difference between the target speed at time T and the actual speed at time T as a reference value at time T, determines whether the reference value at time T is within a preset threshold range, and records the difference;

[0056] S102: When the engine controller determines that the reference value at time Y+t is within the preset threshold interval, the engine controller further determines whether the reference value at time Y-1 is not within the preset threshold interval, and the reference value from time Y to time Y+t are all within the preset threshold interval, Y is a positive number, t is the delay time and t is a positive number, and Y+t is less than or equal to the maximum value of the T value range;

[0057] S1021: If satisfied, the engine controller reports the fault information to the vehicle controller according to the reference value at time Y.

[0058] Specifically, in step S101, the engine controller calculates the target speed at time T according to the engine's operating water temperature at time T, the speed at time T, and the load at time T, including:

[0059] The engine controller stores a database; the operating water temperature, speed, load and calibration values ​​of the engine are stored in the database in association with each other;

[0060] The engine controller obtains the associated target calibration value from the database according to the engine's operating water temperature at time T, the engine's speed at time T, and the engine's load at time T;

[0061] The target speed at time T is calculated based on the parameter information of the electronic water pump and the target calibration value, including:

[0062] The parameter information includes the maximum speed. The maximum speed is multiplied by the target calibration value and then divided by 100 to obtain the target speed at the Tth moment.

[0063] In step S101, the engine controller obtains the real speed at the Tth moment when the electronic water pump executes the target speed at the Tth moment, including:

[0064] When the electronic water pump executes the target speed at the Tth moment, a back electromotive force at the Tth moment is generated;

[0065] The engine controller obtains the back electromotive force at the Tth moment, and calculates the real speed at the Tth moment according to the back electromotive force at the Tth moment and the back electromotive force constant.

[0066] In step S102, the delay time is determined according to the target speed at the Y+t time, and the delay time is negatively correlated with the target speed at the Y+t time;

[0067] Alternatively, the delay duration is determined according to the engine speed at the Y+tth moment, and the delay duration is negatively correlated with the engine speed at the Y+tth moment.

[0068] It should be noted that the delay time can be determined according to the target speed of the electronic water pump. When a fault occurs, if the speed of the electronic water pump is faster, the probability of damage is greater, so the delay time can be a shorter time period; conversely, when a fault occurs, if the speed of the electronic water pump is slower, the delay time can be set to a longer time period. The delay time can also be determined according to the working conditions of the engine. Different working conditions of the engine have different requirements for the adjustment accuracy of the electronic water pump. For example, if the speed of the engine is faster, the heat is faster, and the speed accuracy of the electronic water pump must be improved. Then the delay time needs to be set relatively short to avoid engine failure; if the speed of the engine is slower, the heat generated by the engine rotation is relatively low, and the speed accuracy requirement of the electronic water pump is not so high, so the delay time can also be set relatively long. Of course, it is not limited to this. The delay time can be set according to actual needs and other operating parameters. This embodiment does not make specific restrictions on this.

[0069] In step S1021, the engine controller reports fault information to the vehicle controller according to the reference value at the Yth moment, including:

[0070] The preset threshold interval includes an alarm threshold interval and a shutdown threshold interval, and the alarm threshold interval and the shutdown threshold interval do not overlap;

[0071] If the engine controller determines that the reference value at time Y is within the warning threshold range, it reports the warning fault information to the vehicle controller, the vehicle controller receives the warning fault information, reduces the power generation power of the range extender and sends a warning prompt to the display screen, and the display screen receives the warning prompt and displays it;

[0072] If the engine controller determines that the reference value at time Y is within the shutdown threshold range, it reports the shutdown fault information to the vehicle controller. The vehicle controller receives the shutdown fault information, controls the range extender to shut down and sends a fault prompt to the display screen. The display screen receives the fault prompt and displays it.

[0073] It should be noted that the back electromotive force constant multiplied by the speed is equal to the back electromotive force. By obtaining the back electromotive force and the back electromotive force constant at the Tth moment, the real speed at the Tth moment can be calculated.

[0074] It is understandable that the higher the power generation of the range extender, the higher the temperature of the engine. The vehicle controller receives the alarm fault information, indicating that the stator water pump has a certain speed deviation at this time. By reducing the power generation of the range extender, the temperature of the engine is reduced, thereby avoiding the danger of insufficient cooling of the engine caused by the stator water pump failure. The alarm prompt displayed on the display may be "The electronic water pump has a minor fault, and the power generation of the range extender has been limited. Please contact after-sales personnel for processing." Of course, it is not limited to this. The vehicle controller receives the shutdown fault information, indicating that the speed deviation of the stator water pump is huge at this time, and there is a great safety hazard, so it is necessary to control the range extender to shut down. The fault prompt displayed on the display may be "The electronic water pump has a serious fault, and the range extender has stopped working. Please contact after-sales personnel immediately for processing." Of course, it is not limited to this.

[0075] By judging that the reference values ​​from the Yth moment to the Y+tth moment are all within the preset threshold range, it is determined that the electronic water pump has been faulty during the time period from the Yth moment to the Y+tth moment, that is, the continuity of the fault existence for the t-time period is ensured. Based on this, the reliability of reporting fault information to the vehicle controller is higher, and the misjudgment of the electronic water pump fault is avoided. The speed of the electronic water pump is monitored and diagnosed in real time, and the working status of the electronic water pump is fed back in time. When the speed of the electronic water pump deviates, corresponding measures are taken and a reminder is given that the electronic water pump needs to be repaired, thereby improving the thermal management requirements of the engine cooling water circuit and improving the purpose of accurately controlling the engine water temperature.

[0076] Example 3

[0077] In this embodiment, the alarm threshold interval is 500 to 1000 rpm, the shutdown threshold interval is greater than 1000 rpm, the value range of t is 5-10, t may be an integer or not, t may be 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10, which can be selected according to actual needs. The maximum speed of the electronic water pump is 2000 rpm. The database includes 3 query tables, and the query tables correspond to water temperature intervals. The water temperature intervals of any two query tables do not overlap. In each query table, the engine's operating water temperature, speed, load and calibration value are interrelated. The alarm threshold interval, the shutdown threshold interval and the value range of t can be divided according to actual needs. The query table can also be obtained by calibration experiments according to actual needs. This embodiment does not impose specific restrictions on this.

[0078] The three query tables in this embodiment are respectively a low water temperature query table, a medium water temperature query table and a high water temperature query table, wherein the water temperature interval of the low water temperature query table is less than 60°C, the water temperature interval of the medium water temperature query table is 60°C to 90°C, and the water temperature interval of the high water temperature query table is greater than 90°C. Specifically, the low water temperature query table, the medium water temperature query table and the high water temperature query table can be seen in Tables 1 to 3:

[0079] Table 1. Low water temperature query table

[0080]

[0081] Table 1. Low water temperature query table

[0082]

[0083] Table 2. Water temperature query table

[0084]

[0085] Table 3. High water temperature query table

[0086]

[0087] In Tables 1 to 3, the unit of rotation speed is revolutions per minute, and the unit of load is %.

[0088] The engine controller obtains the engine's operating water temperature at the Y+tth moment, the speed at the Y+tth moment, and the load at the Y+tth moment. If the operating water temperature at the Y+tth moment is less than 60°C, the speed at the Y+tth moment is 2000 rpm, and the load at the Y+tth moment is 60%, the engine controller searches Table 1 for the target calibration values ​​corresponding to the speed at the Y+tth moment and the load at the Y+tth moment according to the operating water temperature at the Y+tth moment, and obtains a target calibration value of 60, 2000×60÷100=1200 rpm, that is, the target speed at the Y+tth moment is 1200 rpm.

[0089] The engine controller transmits the target speed at time Y+t to the electronic water pump, and the electronic water pump executes the target speed at time Y+t.

[0090] The engine controller obtains the actual speed of the electronic water pump at the Y+t moment when it executes the target speed at the Y+t moment as 1800 rpm, and the engine controller determines that the reference value at the Y+t moment is greater than 500 rpm, that is, the engine controller determines that the reference value at the Y+t moment is within the alarm threshold interval and records it.

[0091] The engine controller continues to determine that the reference value at moment Y-1 is less than 500 rpm, while the reference value at moment Y, the reference value at moment Y+1, ..., the reference value at moment Y+t are all greater than 500 rpm. The engine controller retrieves the reference value at moment Y as 1700 rpm, determines that the reference value at moment Y is within the alarm threshold range, and reports the alarm fault information to the vehicle controller.

[0092] The vehicle controller receives the alarm fault information, reduces the power generation power of the range extender to 50%, and sends an alarm prompt to the display screen "The electronic water pump has a minor fault, the power generation power of the range extender has been limited, please contact after-sales personnel for processing", and the display screen receives the alarm prompt and displays it.

[0093] By acquiring the real speed and target speed of the electronic water pump in real time, the speed deviation of the electronic water pump can be reliably monitored and diagnosed, and safety measures can be taken in time when the speed deviation of the electronic water pump occurs.

[0094] Example 4

[0095] Based on the same inventive concept, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the electronic device implements a speed diagnosis method for an electronic water pump of an extended-range engine as described in any one of the above-mentioned embodiments.

[0096] Example 5

[0097] Based on the same inventive concept, the present invention also provides a storage medium on which a computer program is stored. When the computer program is executed by a processor, a speed diagnosis method for an electronic water pump of an extended-range engine is implemented as in any one of the above embodiments.

[0098] It can be seen from the above embodiments that the speed diagnosis method, device and storage medium of the electronic water pump of the range-extended engine provided by the present invention achieve at least the following beneficial effects:

[0099] The speed diagnosis method, device and storage medium of the electronic water pump of the extended-range engine provided by the present invention include: when the engine controller determines that the reference value at the Y+t moment is within the preset threshold interval, the engine controller also determines whether the reference value at the Y-1 moment is not within the preset threshold interval, and the reference value at the Y moment to the Y+t moment are all within the preset threshold interval; if satisfied, the engine controller reports fault information to the vehicle controller according to the reference value at the Y moment. By determining that the reference values ​​from the Y moment to the Y+t moment are all within the preset threshold interval, it is determined that the electronic water pump has always been faulty during the time period from the Y moment to the Y+t moment, and based on this, the reliability of reporting fault information to the vehicle controller is higher, avoiding the situation of misjudgment of the electronic water pump fault.

[0100] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for diagnosing the rotation speed of an electronic water pump of a range-extended engine, characterized in that: include: The engine controller calculates the target speed at the Tth moment according to the engine's operating water temperature at the Tth moment, the speed at the Tth moment, and the load at the Tth moment, and transmits the result to the electronic water pump, where T is a positive number; the engine controller obtains the actual speed at the Tth moment when the electronic water pump executes the target speed at the Tth moment, calculates the absolute value of the difference between the target speed at the Tth moment and the actual speed at the Tth moment as the reference value at the Tth moment, determines whether the reference value at the Tth moment is within a preset threshold interval, and records the difference; When the engine controller determines that the reference value at the Y+tth moment is within the preset threshold interval, the engine controller further determines whether the reference value at the Y-1th moment is not within the preset threshold interval, and the reference value from the Yth moment to the Y+tth moment are all within the preset threshold interval, Y is a positive number, t is the delay time and t is a positive number, and Y+t is less than or equal to the maximum value of the T value range; If it is satisfied, the engine controller reports the fault information to the vehicle controller according to the reference value at the Yth moment.

2. The method for diagnosing the speed of an electronic water pump of a range-extended engine according to claim 1, characterized in that: The engine controller reports fault information to the vehicle controller according to the reference value at the Yth moment, including: The preset threshold interval includes an alarm threshold interval and a shutdown threshold interval, and the alarm threshold interval does not overlap with the shutdown threshold interval; If the engine controller determines that the reference value at the Yth moment is within the warning threshold range, reporting the warning fault information to the vehicle controller; If the engine controller determines that the reference value at the Yth moment is within the shutdown threshold range, the shutdown fault information is reported to the vehicle controller.

3. The method for diagnosing the speed of an electronic water pump of a range-extended engine according to claim 1, characterized in that: The engine controller calculates the target speed at time T according to the engine's operating water temperature at time T, the speed at time T, and the load at time T, including: The engine controller stores a database; the operating water temperature, speed, load and calibration values ​​of the engine in the database are stored in association with each other; The engine controller acquires the associated target calibration value from the database according to the operating water temperature of the engine at the Tth moment, the speed at the Tth moment, and the load at the Tth moment; The target speed at the time T is calculated according to the parameter information of the electronic water pump and the target calibration value.

4. The method for diagnosing the speed of an electronic water pump of a range-extended engine according to claim 3, characterized in that: The step of calculating the target speed at time T according to the parameter information of the electronic water pump and the target calibration value includes: The parameter information includes a maximum rotational speed, and the maximum rotational speed is multiplied by the target calibration value and then divided by 100 to obtain the target rotational speed at the Tth moment.

5. The method for diagnosing the rotation speed of an electronic water pump of a range-extended engine according to claim 1, characterized in that: The delay time is determined according to the target speed at the Y+t moment, and the delay time is negatively correlated with the target speed at the Y+t moment; Alternatively, the delay duration is determined according to the speed of the engine at the Y+tth moment, and the delay duration is negatively correlated with the speed at the Y+tth moment.

6. The method for diagnosing the rotation speed of an electronic water pump of a range-extended engine according to claim 1, characterized in that: The engine controller obtains the real speed at the Tth moment when the electronic water pump executes the target speed at the Tth moment, including: When the electronic water pump executes the target speed at the Tth moment, a back electromotive force at the Tth moment is generated; The engine controller obtains the back electromotive force at the Tth moment, and calculates the real speed at the Tth moment according to the back electromotive force at the Tth moment and the back electromotive force constant.

7. The method for diagnosing the speed of an electronic water pump of a range-extended engine according to claim 2, characterized in that: After reporting the alarm fault information to the vehicle controller, the method includes: The vehicle controller receives the warning fault information, reduces the power generation power of the range extender and sends a warning prompt to the display screen, and the display screen receives the warning prompt for display; The reporting of shutdown fault information to the vehicle controller includes: The vehicle controller receives the shutdown fault information, controls the range extender to shut down and sends a fault prompt to the display screen, and the display screen receives the fault prompt for display.

8. The method for diagnosing the speed of an electronic water pump of a range-extended engine according to claim 2, characterized in that: The alarm threshold range is 500 rpm to 1000 rpm; The shutdown threshold interval is greater than 1000 revolutions per minute.

9. An electronic device, characterized in that: The electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the electronic device implements the speed diagnosis method for the electronic water pump of the range-extended engine as described in any one of claims 1 to 8.

10. A storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the speed diagnosis method of the electronic water pump of the range-extended engine as claimed in any one of claims 1 to 8 is implemented.

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