Motor performance test method and device of new energy vehicle, vehicle-mounted controller, new energy vehicle and computer program product

Abstract

The invention discloses a motor performance testing method and device of a new energy vehicle, a vehicle-mounted controller, the new energy vehicle and a computer program product. The method comprises the steps of determining a rotating speed-standard voltage first mapping relation and a rotating speed-standard voltage second mapping relation of a to-be-tested target motor on the new energy vehicle; a physical battery on the new energy vehicle is adopted to supply power to the vehicle-mounted controller, so that the vehicle-mounted controller controls the to-be-tested target motor to rotate to at least one target rotating speed, and the actually measured target voltage of the to-be-tested target motor at each target rotating speed is tested; substituting each target rotating speed into the first mapping relation and the second mapping relation to obtain a corresponding standard voltage interval; and if the ratio of the number of the actually-measured target voltages falling into the corresponding standard voltage interval to the total number of the actually-measured target voltages under all the target rotating speeds is greater than or equal to a preset ratio, determining that the performance of the to-be-measured target motor is qualified. According to the scheme, the performance of the motor on the new energy vehicle can be conveniently, efficiently and reliably tested on line.

Description

TECHNICAL FIELD

[0001] The embodiment of the application relates to the motor performance testing technical field of a new energy vehicle, in particular to a motor performance testing method and device of a new energy vehicle, a vehicle-mounted controller, a new energy vehicle and a computer program product. BACKGROUND

[0002] The safety and reliability of the life cycle of a driving motor in a new energy vehicle are currently mainly verified by adopting an End-of-Line (EOL) test of the motor on a dynamometer test bench before the motor is installed in the new energy vehicle (usually before mass production). The verification of the endurance life of the motor is mainly achieved by performing a durability test on a small number of sample motors on the dynamometer test bench. However, in actual mass production of the new energy vehicle, the performance parameters of a large number of driving motors will have certain deviations, and the driving motor will also have performance degradation in normal use, which will all lead to a decrease in the reliability of the driving assembly.

[0003] The existing scheme for verifying the performance of the motor on the dynamometer test bench is specifically operated as follows: by means of the dynamometer test bench and a dynamometer, the motor on the dynamometer test bench is set to different rotating speeds, the motor counter-trails the sample motor to be tested to different rotating speeds, and then the counter electromotive force of the sample motor to be tested is measured by the dynamometer. The counter electromotive force of the sample motor to be tested is used to determine whether the motor performance is qualified.

[0004] The above-mentioned testing method has the following disadvantages: (1) the testing process needs to be fixed by additional tooling to install the motor to be tested on the dynamometer test bench, the operation is complex and cumbersome, the investment cost is high, and the testing efficiency is low; (2) the testing is performed on the dynamometer test bench, and it is impossible to directly and conveniently and efficiently perform online performance detection on the motor of the new energy vehicle (for example, during maintenance of the new energy vehicle); (3) the test results of a limited number of sample motors cannot ensure that the performance of the motor in actual use after being installed on the vehicle is normal, the reliability of the test results is insufficient, and the performance degradation of the motor in use on the new energy vehicle cannot be monitored in a timely manner. SUMMARY

[0005] The technical problem solved by the embodiment of the application is how to conveniently, efficiently and reliably perform online testing on the performance of the motor on the new energy vehicle.

[0006] To solve the above technical problems, the embodiment of the present application provides a motor performance testing method of a new energy vehicle, comprising the following steps: determining a first mapping relationship between rotation speed and standard voltage and a second mapping relationship between rotation speed and standard voltage of a target motor to be tested on the new energy vehicle; using a physical battery on the new energy vehicle to supply power to a vehicle-mounted controller on the new energy vehicle, and making the vehicle-mounted controller control the target motor to be tested to rotate to at least one target rotation speed, and then testing a measured target voltage of the target motor to be tested at each target rotation speed, wherein the target motor to be tested rotates while driving a first load assembly to rotate, and the first load assembly comprises a wheel coupled with a rotating shaft of the target motor to be tested and a connecting piece between the rotating shaft and the wheel; for each target rotation speed, the target rotation speed is substituted into the first mapping relationship between rotation speed and standard voltage and the second mapping relationship between rotation speed and standard voltage respectively to obtain a first standard voltage and a second standard voltage corresponding to the target rotation speed, and a standard voltage interval corresponding to the target rotation speed is obtained by taking the first standard voltage and the second standard voltage as interval endpoints; if a ratio between a number of measured target voltages falling into the corresponding standard voltage interval and a total number of measured target voltages at all target rotation speeds is greater than or equal to a preset ratio, the performance of the target motor to be tested is confirmed to be qualified.

[0007] Optionally, the determining of the first mapping relationship between rotation speed and standard voltage and the second mapping relationship between rotation speed and standard voltage of the target motor to be tested on the new energy vehicle comprises: using a battery simulator to supply power to a sample controller, and making the sample controller control a sample motor to rotate to a plurality of different sample rotation speeds, and then testing a first sample voltage of the sample motor at each sample rotation speed, wherein the sample motor rotates while no other load is driven; and / or, installing the sample controller and the sample motor on a sample new energy vehicle, and then using a sample physical battery of the sample new energy vehicle to supply power to the sample controller, and making the sample controller control the sample motor to rotate to the plurality of different sample rotation speeds, and then testing a second sample voltage of the sample motor at each sample rotation speed, wherein the sample motor rotates while driving a second load assembly to rotate, and the second load assembly comprises a wheel coupled with a rotating shaft of the sample motor and a connecting piece between the rotating shaft and the wheel; based on each first sample voltage and / or each second sample voltage, a plurality of first sample standard voltages and a plurality of second sample standard voltages corresponding to the plurality of different sample rotation speeds are determined; the plurality of different sample rotation speeds and the plurality of first sample standard voltages corresponding thereto are used for fitting to obtain the first mapping relationship between rotation speed and standard voltage, and the plurality of different sample rotation speeds and the plurality of second sample standard voltages corresponding thereto are used for fitting to obtain the second mapping relationship between rotation speed and standard voltage.

[0008] Optionally, based on each first sample voltage and / or each second sample voltage, determining the plurality of first sample standard voltages and the plurality of second sample standard voltages corresponding to the plurality of different sample rotation speeds comprises: for each first sample voltage, multiplying the first sample voltage by a preset first percentage and a preset second percentage respectively to obtain the first sample standard voltage and the second sample standard voltage corresponding to the sample rotation speed to which the first sample voltage belongs; wherein the second percentage is greater than the first percentage, and the difference between the two is within a preset percentage interval.

[0009] Optionally, based on each first sample voltage and / or each second sample voltage, determining the plurality of first sample standard voltages and the plurality of second sample standard voltages corresponding to the plurality of different sample rotation speeds comprises: for each second sample voltage, multiplying the second sample voltage by a preset third percentage and a preset fourth percentage respectively to obtain the first sample standard voltage and the second sample standard voltage corresponding to the sample rotation speed to which the second sample voltage belongs; wherein the fourth percentage is greater than the third percentage, and the difference between the two is within a preset percentage interval.

[0010] Optionally, based on each first sample voltage and / or each second sample voltage, determining the plurality of first sample standard voltages and the plurality of second sample standard voltages corresponding to the plurality of different sample rotation speeds comprises: performing a weighted operation on the first sample voltage and the second sample voltage under each sample rotation speed to obtain a weighted sample voltage corresponding to the sample rotation speed; multiplying the weighted sample voltage corresponding to the sample rotation speed by a preset fifth percentage and a preset sixth percentage respectively to obtain the first sample standard voltage and the second sample standard voltage corresponding to the sample rotation speed; wherein the sixth percentage is greater than the fifth percentage, and the difference between the two is within a preset percentage interval.

[0011] Optionally, before causing the vehicle-mounted controller to control the target motor to be tested to rotate to at least one target rotation speed, the method further comprises: switching the working mode of the vehicle-mounted controller to a maintenance mode, the maintenance mode being used to instruct the vehicle-mounted controller to start controlling the target motor to be tested to rotate to the at least one target rotation speed.

[0012] Optionally, before causing the vehicle-mounted controller to control the target motor to be tested to rotate to at least one target rotation speed, the method further comprises: lifting the new energy vehicle frame so that each wheel of the new energy vehicle is in a suspended state.

[0013] Optionally, the method further comprises: if the ratio between the number of measured target voltages falling into the corresponding standard voltage interval and the total number of measured target voltages under all target rotation speeds is less than the preset ratio, confirming that the performance of the target motor to be tested is unqualified.

[0014] Optionally, after confirming that the performance of the target motor under test is unqualified, the method further includes: for each measured target voltage that does not fall into the corresponding standard voltage range, calculating the voltage difference between the measured target voltage and the average value of the corresponding first standard voltage and second standard voltage, and recording it as the calculated voltage difference corresponding to the measured target voltage; for each measured target voltage that does not fall into the corresponding standard voltage range, averaging the calculated voltage differences corresponding to each measured target voltage to obtain the average voltage difference; confirming the voltage sub-range into which the absolute value of the average voltage difference falls, and issuing a warning signal corresponding to the voltage sub-range; wherein, the voltage sub-range is obtained by dividing a preset voltage range into intervals, and each voltage sub-range has its own corresponding warning signal.

[0015] This invention also provides a motor performance testing device for a new energy vehicle, comprising: a mapping relationship determination module, used to determine a first mapping relationship between speed and standard voltage and a second mapping relationship between speed and standard voltage of a target motor under test on the new energy vehicle; and a measured target voltage determination module, used to power the vehicle controller on the new energy vehicle using a physical battery on the new energy vehicle, and to cause the vehicle controller to control the target motor under test to rotate to at least one target speed, and then test the measured target voltage of the target motor under test at each target speed, wherein the target motor under test also drives a first load component to rotate while rotating, the first load component... The load assembly includes a wheel coupled to the shaft of the target motor under test, and a connecting component between the shaft and the wheel; a standard voltage range determination module is used to, for each target speed, substitute the target speed into the first mapping relationship of speed-standard voltage and the second mapping relationship of speed-standard voltage respectively to obtain the first standard voltage and the second standard voltage corresponding to the target speed, and obtain the standard voltage range corresponding to the target speed using the first standard voltage and the second standard voltage as the interval endpoints; a motor performance judgment module is used to confirm that the performance of the target motor under test is qualified if the measured target voltage at a preset proportion of target speeds all fall into the corresponding standard voltage range.

[0016] This invention also provides a storage medium storing a computer program, which, when run by a processor, executes the steps of the above-described method for testing the motor performance of a new energy vehicle.

[0017] This invention also provides an on-board controller, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor runs the computer program, it executes the steps of the above-described method for testing the motor performance of a new energy vehicle.

[0018] This invention also provides a new energy vehicle, including the aforementioned target motor, the aforementioned physical battery, and the aforementioned load component, as well as the aforementioned vehicle controller.

[0019] This invention also provides a computer program product, including a computer program, which, when run by a processor, executes the steps of the above-described method for testing the motor performance of a new energy vehicle.

[0020] Compared with the prior art, the technical solution of the embodiments of the present invention has the following beneficial effects:

[0021] Compared to existing conventional motor performance testing methods that rely on complex and cumbersome testing of motor performance using dynamometers and test benches, and cannot directly perform online performance testing on the motors of new energy vehicles (NEVs), resulting in high complexity, cost, and insufficient accuracy and reliability, this implementation scheme eliminates the need for additional tooling and cumbersome operations. Instead, it directly utilizes pre-calibrated speed-standard voltage mappings (first and second mappings) of the target motor under test. Under on-board conditions, the scheme uses the NEV's onboard battery and controller to drive the target motor and measure its voltage, thus determining whether the measured voltage falls within the standard voltage range. This allows for convenient, efficient, and reliable testing of the target motor's performance. Furthermore, at appropriate times during NEV usage (e.g., during scheduled or unscheduled maintenance), on-board online and timely monitoring of the vehicle's motor performance can be achieved, improving the safety and reliability of motor operation. Attached Figure Description

[0022] Figure 1 This is a flowchart of a method for testing the motor performance of a new energy vehicle according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of an electric drive system for a new energy vehicle according to an embodiment of the present invention;

[0024] Figure 3 yes Figure 1 A flowchart of a specific implementation of step S11;

[0025] Figure 4 This is a schematic diagram of the structure of a motor performance testing device for a new energy vehicle according to an embodiment of the present invention. Detailed Implementation

[0026] To make the above-mentioned objectives, features and beneficial effects of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Reference Figure 1, Figure 1 This is a flowchart of a method for testing the motor performance of a new energy vehicle according to an embodiment of the present invention. The method may include steps S11 to S14:

[0028] Step S11: Determine the first mapping relationship between the rotational speed and the standard voltage and the second mapping relationship between the rotational speed and the standard voltage of the target motor under test on the new energy vehicle;

[0029] Step S12: Power the vehicle controller on the new energy vehicle with the physical battery on the new energy vehicle, and make the vehicle controller control the target motor under test to rotate to at least one target speed. Then, test the actual target voltage of the target motor under test at each target speed. The target motor under test rotates while driving the first load component to rotate. The first load component includes a wheel coupled to the shaft of the target motor under test and a connecting piece between the shaft and the wheel.

[0030] Step S13: For each target rotational speed, substitute the target rotational speed into the first mapping relationship of rotational speed-standard voltage and the second mapping relationship of rotational speed-standard voltage respectively to obtain the first standard voltage and the second standard voltage corresponding to the target rotational speed, and use the first standard voltage and the second standard voltage as the interval endpoints to obtain the standard voltage interval corresponding to the target rotational speed;

[0031] Step S14: If the ratio between the number of measured target voltages falling within the corresponding standard voltage range and the total number of measured target voltages at all target speeds is greater than or equal to a preset ratio, then the performance of the target motor under test is confirmed to be qualified.

[0032] In the specific implementation of step S11, the new energy vehicle can refer to a car that uses unconventional vehicle fuels as a power source (or uses conventional vehicle fuels but adopts new on-board power devices), integrating advanced technologies in vehicle power control and drive, resulting in a vehicle with advanced technical principles and new technologies and structures. New energy vehicles mainly include four types: Hybrid Electric Vehicles (HEVs), Battery Electric Vehicles (BEVs, including solar-powered vehicles), Fuel Cell Electric Vehicles (FCEVs), and other new energy vehicles (such as supercapacitors, flywheels, and other high-efficiency energy storage devices). Unconventional vehicle fuels can refer to fuels other than gasoline and diesel.

[0033] In practice, the first mapping relationship between speed and standard voltage and the second mapping relationship between speed and standard voltage of the target motor under test can be obtained and pre-stored in advance through test experiments with the sample controller and the sample motor, and can be directly retrieved from the memory when needed.

[0034] Combination Figure 2 , Figure 2 This is a schematic diagram of an electric drive system for a new energy vehicle according to an embodiment of the present invention.

[0035] Specifically, the electric drive system of the new energy vehicle mainly includes: a vehicle control unit (VCU), a physical battery, a motor controller (corresponding to the on-board controller described in this application), a motor, and a load assembly. The physical battery may specifically include a high-voltage battery and a low-voltage battery, used to power the motor controller; the load assembly may include wheels coupled to the motor shaft, and a connecting component between the motor shaft and the wheels. The connecting component may include a high-speed drive shaft, a reducer, and the reducer's output shaft, etc.

[0036] In specific implementation, the process of the motor controller (i.e., the vehicle controller) driving the motor and wheels to rotate is mainly as follows: the motor controller controls the motor to rotate, and the motor shaft and the high-speed transmission shaft rotate at the same speed, so as to drive the output shaft of the reducer to rotate through the high-speed transmission shaft, thereby further driving the wheels to rotate.

[0037] For details regarding the interface connections (or couplings) and electrical signal transmission relationships between the various components of the electric drive system, please refer to [link to relevant documentation]. Figure 2 The explanations of the various colored lines and text, as well as the conventional methods used in conjunction with existing new energy vehicle electric drive systems, will not be discussed in detail in this article.

[0038] Reference Figure 3 , Figure 3 yes Figure 1 A flowchart of a specific implementation of step S11 is provided; in this embodiment, step S11 may include steps S31 (and / or S32) to S34. When steps S31 and S32 are included simultaneously, there is no specific order of execution between S31 and S32.

[0039] In step S31, a battery simulator is used to power the sample controller, and the sample controller controls the sample motor to rotate to a number of preset different sample speeds. Then, the first sample voltage of the sample motor at each sample speed is tested. The sample motor does not drive other loads while rotating.

[0040] The battery simulator is a concept corresponding to the physical battery on the new energy vehicle. Specifically, the battery simulator can refer to a power supply device that simulates the charging and discharging characteristics of the physical battery on the new energy vehicle (including the changes in the battery's internal resistance characteristics during the battery discharge process).

[0041] It should be noted that, compared to Figure 1 The steps S12 shown below and S32 below (are performed on the new energy vehicle (or referred to as "installation conditions" or "vehicle conditions")) are performed under "non-installation conditions" ("or non-vehicle conditions"). That is, the sample controller and the sample motor are not installed on the new energy vehicle, but are fixed (for example, by fixing them with a bench). Then, the sample controller is powered by a battery simulator, and the sample controller controls the sample motor to rotate to the multiple different sample speeds.

[0042] In the "non-vehicle loading condition", the shaft of the sample motor is not connected to any other load equipment (that is, the shaft of the sample motor is not connected to any wheels, shaft and connecting parts between wheels, etc.). Therefore, the sample motor does not drive any other load while rotating. In other words, the shaft of the sample motor is spinning idly under the drive of the sample controller.

[0043] In practice, the number and specific values ​​of the preset multiple different sample rotation speeds can be appropriately set according to actual needs. For example, the difference between any two sample rotation speeds with adjacent values ​​can be kept consistent. As a non-limiting example, the multiple different sample rotation speeds can be set to 1000 rpm, 2000 rpm, 3000 rpm, 4000 rpm, etc.

[0044] In step S32, the sample controller and the sample motor are installed on the sample new energy vehicle. Then, the sample controller is powered by the sample physical battery of the sample new energy vehicle, and the sample controller controls the sample motor to rotate to the multiple different sample speeds. Then, the second sample voltage of the sample motor at each sample speed is tested. The sample motor rotates while driving the second load component to rotate. The second load component includes a wheel coupled to the shaft of the sample motor and a connecting piece between the shaft and the wheel.

[0045] As mentioned above, compared to step S31, step S32 is performed under "vehicle installation conditions" (or "on-board conditions"). That is, the sample controller and the sample motor need to be installed on the sample new energy vehicle first, and then the sample physical battery of the sample new energy vehicle (instead of the battery simulator as in step S31) is used to power the sample controller, so that the sample controller controls the sample motor to rotate to the multiple different sample speeds.

[0046] In the "vehicle loading condition," the shaft of the sample motor is not idling but is coupled to other load equipment (i.e., the second load component). Therefore, while the sample motor rotates, it also drives the second load component to rotate. The second load component includes a wheel coupled to the shaft of the sample motor and a connecting member between the shaft and the wheel. For details regarding this connecting member, please refer to [link to relevant documentation]. Figure 2 The description of the connectors in the original text will not be repeated here.

[0047] Based on the above, the main differences between the "non-vehicle installation conditions" in step S31 and the "vehicle installation conditions" in step S32 can be summarized as follows: (1) Different test environments: In step S31, the sample controller and sample motor are not installed in a vehicle, while in step S32, the sample controller and sample motor are installed in a new energy vehicle; (2) Different front-end inputs (i.e., power supply terminals) of the controller: In step S31, a battery simulator is used to power the sample controller, while in step S32, the sample physical battery on the sample new energy vehicle is used to power the sample controller; (3) Different loads driven by the sample controller: In step S31, the shaft of the sample controller is not connected to any load and is idling, while in step S32, the shaft of the sample controller is connected to a wheel and a connecting piece between the shaft and the wheel, etc.

[0048] In step S33, based on each first sample voltage and / or each second sample voltage, a plurality of first sample standard voltages and a plurality of second sample standard voltages corresponding to the plurality of different sample rotation speeds are determined.

[0049] In step S34, the rotational speed of the multiple different samples and their corresponding first sample standard voltages are fitted to obtain the first mapping relationship between rotational speed and standard voltage, and the rotational speed of the multiple different samples and their corresponding second sample standard voltages are fitted to obtain the second mapping relationship between rotational speed and standard voltage.

[0050] In specific implementation, appropriate functions such as linear functions and power functions can be selected for fitting based on the needs of the actual application scenario. This embodiment of the invention does not limit this.

[0051] Furthermore, Figure 3Step S33 described herein can be performed in at least the following three specific implementation methods.

[0052] In a first embodiment, step S33 may include: for each first sample voltage, multiplying the first sample voltage by a preset first percentage and a preset second percentage respectively to obtain the first sample standard voltage and the second sample standard voltage corresponding to the sample rotation speed to which the first sample voltage belongs; wherein, the second percentage is greater than the first percentage, and the difference between the two is within the preset percentage range.

[0053] The preset percentage range can be selected from an appropriate error range. As a non-limiting embodiment, the preset percentage range can be selected from the range [5%, 25%]. Taking a difference of 20% as an example, the first percentage can be set to 110%, and the second percentage can be set to 90%.

[0054] In the second embodiment, step S33 may include: for each second sample voltage, multiplying the second sample voltage by a preset third percentage and a preset fourth percentage respectively to obtain the first sample standard voltage and the second sample standard voltage corresponding to the sample rotation speed to which the second sample voltage belongs; wherein, the fourth percentage is greater than the third percentage, and the difference between the two is within the preset percentage range.

[0055] In the third embodiment, step S33 may include: performing a weighted operation (e.g., weighted summation) on the first sample voltage and the second sample voltage at each sample rotation speed to obtain the weighted sample voltage corresponding to the sample rotation speed; multiplying the weighted sample voltage corresponding to the sample rotation speed by a preset fifth percentage and a preset sixth percentage respectively to obtain the first sample standard voltage and the second sample standard voltage corresponding to the sample rotation speed; wherein the sixth percentage is greater than the fifth percentage, and the difference between the two is within a preset percentage range.

[0056] Furthermore, the weight of the second sample voltage can be greater than the weight of the first sample voltage. This is because the second sample voltage is the voltage test result of the sample motor under "vehicle installation conditions," and compared to the first sample voltage, it better characterizes the performance of the motor in actual use in new energy vehicles, making it more reliable for reference.

[0057] In practice, the third and fifth percentages may be the same as or different from the first percentage, and the fourth and sixth percentages may be the same as or different from the second percentage. The specific settings for each percentage value can be referenced in the examples of setting the first and second percentages mentioned earlier, and will not be repeated here.

[0058] It is understood that in the first specific embodiment described above, only the voltage test results of the sample motor under the "non-vehicle installation conditions" of step S31 are considered (which may be referred to as the "theoretical test results" in this application); in the second specific embodiment described above, only the voltage test results of the sample motor under the "vehicle installation conditions" of step S32 are considered (which may be referred to as the "actual test results" in this application because they are closer to the voltage test results of the motor in the actual use process in new energy vehicles); in the third specific embodiment described above, both the "theoretical test results" and the "actual test results" are considered, and appropriate weights are set for both for weighted calculation.

[0059] Continue to refer to Figure 1 In the specific implementation of step S12, the test operation of the actual target voltage of the target motor under test on the new energy vehicle can be performed during the actual use of the new energy vehicle by the user after it leaves the factory. For example, it can be performed during the user's regular or irregular maintenance of the new energy vehicle.

[0060] It is understood that the test conditions in step S12 can also be referred to as "vehicle conditions," and... Figure 3 The test operation in step S32 is similar. The specific test process and principle can be found in the previous description of step S32, which will not be repeated here.

[0061] In specific implementation, the target rotational speeds in step S12 can be... Figure 3 The rotational speeds of the samples in the illustrated embodiments may be the same or different. The embodiments of the present invention do not impose any particular limitation on the number and value of each target rotational speed.

[0062] Furthermore, before the vehicle controller controls the target motor under test to rotate to at least one target speed, the method may further include: switching the operating mode of the vehicle controller to a maintenance mode, the maintenance mode being used to instruct the vehicle controller to start controlling the target motor under test to rotate to the at least one target speed.

[0063] Furthermore, before the vehicle controller controls the target motor to rotate to at least one target speed, the method may further include: suspending the new energy vehicle so that each wheel of the new energy vehicle is in a suspended state.

[0064] In this embodiment of the invention, before conducting the motor voltage test under vehicle conditions, the new energy vehicle is first suspended in the air, so that the vehicle is stationary and the vehicle controller drives the target motor under test and the first load component to rotate. This can effectively avoid the friction between the wheels and the ground and the resistance caused by gravity during the vehicle's movement, making the measured target voltages more referential and reliable, thereby improving the reliability of the motor performance test.

[0065] In the specific implementation of step S14, the preset ratio can be appropriately set according to the actual test accuracy requirements, etc. Non-limitingly, the preset ratio can be selected from the range [80%, 100%].

[0066] In this embodiment of the invention, no additional tooling or cumbersome tooling operations are required. Instead, the target motor's speed-standard voltage first mapping relationship and second mapping relationship, obtained through pre-calibration, can be directly used. Under vehicle conditions, the target motor is driven to rotate by the vehicle's built-in battery and on-board controller, and the motor's voltage value is measured. This allows for determination of whether the measured voltage is within the standard voltage range. Therefore, convenient, efficient, and reliable testing of the target motor's performance can be achieved. Furthermore, at appropriate times when the user uses the new energy vehicle (e.g., during regular or irregular maintenance), on-board online and timely monitoring of the motor's performance can be achieved, improving the safety and reliability of the motor's use.

[0067] Furthermore, the method may also include: if the ratio between the number of measured target voltages falling within the corresponding standard voltage range and the total number of measured target voltages at all target speeds is less than the preset ratio, then the performance of the target motor under test is confirmed to be unqualified.

[0068] Furthermore, after confirming that the performance of the target motor under test is unqualified, the method further includes: for each measured target voltage that does not fall into the corresponding standard voltage range, calculating the voltage difference between the measured target voltage and the average value of the corresponding first standard voltage and second standard voltage, and recording it as the calculated voltage difference corresponding to the measured target voltage; for each measured target voltage that does not fall into the corresponding standard voltage range, averaging the calculated voltage differences corresponding to each measured target voltage to obtain the average voltage difference; confirming the voltage sub-range into which the absolute value of the average voltage difference falls, and issuing a warning signal corresponding to the voltage sub-range; wherein, the voltage sub-range is obtained by dividing a preset voltage range into intervals, and each voltage sub-range has its own corresponding warning signal.

[0069] Among them, the first standard voltage and the second standard voltage corresponding to each measured target voltage are the two endpoint voltages of the standard voltage range corresponding to the target rotational speed to which the measured target voltage belongs.

[0070] Furthermore, the warning signal is used to indicate the performance level of the target motor under test. The larger the voltage value of the voltage sub-interval (e.g., the voltage value at the left end, the voltage value at the right end, the voltage value at the median, or the average voltage value), the lower the performance level indicated by the warning signal corresponding to the voltage sub-interval. The lower the performance level, the worse the performance of the target motor under test. Conversely, the higher the performance level, the better the performance of the target motor under test.

[0071] It is understood that, in this embodiment of the invention, the calculated voltage difference corresponding to each measured target voltage can characterize the difference between the measured target voltage of the target motor under test and the standard voltage at the target speed. Furthermore, the absolute value of the average voltage difference (i.e., the absolute value of the mean of each calculated voltage difference) can characterize the average difference between the measured target voltage of the target motor under test and the corresponding standard voltage at different target speeds. The larger the absolute value of the average voltage difference, the worse the performance of the target motor under test, and therefore the lower the performance level indicated by the corresponding warning signal.

[0072] Based on the above, the measured voltage results of the target motor can be distinguished to characterize the motor performance level corresponding to different test results and issue appropriate warning signals, thereby enabling corresponding interventions (such as repair, update, replacement, etc.).

[0073] Figure 4 This is a schematic diagram of a motor performance testing device for a new energy vehicle according to an embodiment of the present invention. The motor performance testing device for the new energy vehicle may include:

[0074] The mapping relationship determination module 41 is used to determine the first mapping relationship between the speed and the standard voltage and the second mapping relationship between the speed and the standard voltage of the target motor under test on the new energy vehicle;

[0075] The measured target voltage determination module 42 is used to power the vehicle controller on the new energy vehicle with the physical battery on the new energy vehicle, and to make the vehicle controller control the target motor under test to rotate to at least one target speed, and then test the measured target voltage of the target motor under test at each target speed. The target motor under test rotates while driving the first load component to rotate. The first load component includes a wheel coupled to the shaft of the target motor under test, and a connecting piece between the shaft and the wheel.

[0076] The standard voltage range determination module 43 is used to, for each target speed, substitute the target speed into the first mapping relationship of speed-standard voltage and the second mapping relationship of speed-standard voltage respectively to obtain the first standard voltage and the second standard voltage corresponding to the target speed, and use the first standard voltage and the second standard voltage as the interval endpoints to obtain the standard voltage range corresponding to the target speed.

[0077] The motor performance judgment module 44 is used to confirm that the performance of the target motor under test is qualified if the measured target voltage at a preset proportion of target speeds all fall within the corresponding standard voltage range.

[0078] For the principles, specific implementation, and beneficial effects of the electric motor performance testing device for this new energy vehicle, please refer to the preceding text and... Figures 1 to 3 The description of the test method for the motor performance of new energy vehicles shown in any embodiment will not be repeated here.

[0079] This invention also provides a storage medium, such as a computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor. Figures 1 to 3 The steps of a method for testing the motor performance of a new energy vehicle are illustrated in any embodiment. The computer-readable storage medium may include non-volatile or non-transitory memory, and may also include optical discs, hard disk drives, solid-state drives, etc.

[0080] Specifically, in this embodiment of the invention, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0081] It should also be understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous DRAM (DDR SDRAM), enhanced synchronous DRAM (ESDRAM), synchronous linked DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0082] This invention also provides an in-vehicle controller, including a memory and a processor. The memory stores a computer program that can run on the processor, and when the processor runs the computer program, it performs the above-described... Figures 1 to 3 The steps of the method for testing the motor performance of a new energy vehicle are shown in any embodiment.

[0083] This invention also provides a new energy vehicle, including the above-mentioned... Figures 1 to 3 The target motor under test, the physical battery, and the first load component described in any embodiment also include the aforementioned vehicle controller.

[0084] This invention also provides a computer program product, including a computer program, which is executed by a processor. Figures 1 to 3 Steps of the electric motor performance testing method for new energy vehicles shown in any embodiment

[0085] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article indicates that the preceding and following related objects have an "or" relationship.

[0086] In the embodiments of this application, "multiple" refers to two or more.

[0087] The descriptions of "first," "second," etc., appearing in the embodiments of this application are for illustrative purposes and to distinguish the objects being described. They have no order and do not indicate any special limitation on the number of devices in the embodiments of this application, nor do they constitute any limitation on the embodiments of this application.

[0088] It should be noted that the sequence number of each step in this embodiment does not represent a limitation on the execution order of each step.

[0089] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for testing performance of an electric machine of a new energy vehicle, characterized in that, The application relates to a method for testing the performance of a target motor on a new energy vehicle. The method comprises the following steps: determining a first mapping relationship between the rotation speed and standard voltage of the target motor and a second mapping relationship between the rotation speed and standard voltage of the target motor on the new energy vehicle; using a physical battery on the new energy vehicle to supply power to a vehicle-mounted controller on the new energy vehicle, and enabling the vehicle-mounted controller to control the target motor to rotate to at least one target rotation speed, and then respectively testing the measured target voltage of the target motor at each target rotation speed, wherein the target motor rotates while driving a first load assembly to rotate, and the first load assembly comprises a wheel coupled with the rotation shaft of the target motor and a connecting piece between the rotation shaft and the wheel; for each target rotation speed, the target rotation speed is substituted into the first mapping relationship between the rotation speed and standard voltage and the second mapping relationship between the rotation speed and standard voltage to obtain a first standard voltage and a second standard voltage corresponding to the target rotation speed, and a standard voltage interval corresponding to the target rotation speed is obtained by taking the first standard voltage and the second standard voltage as interval endpoints; 2. The method of claim 1, wherein, if the ratio between the number of measured target voltages falling into the corresponding standard voltage interval and the total number of measured target voltages at all target rotation speeds is greater than or equal to a preset ratio, the performance of the target motor is confirmed to be qualified. The method comprises the following steps: using a battery simulator to supply power to a sample controller, and enabling the sample controller to control a sample motor to rotate to a plurality of different sample rotation speeds, and then respectively testing a first sample voltage of the sample motor at each sample rotation speed, wherein the sample motor rotates without driving other loads; and / or, the sample controller and the sample motor are installed on a sample new energy vehicle, then a sample physical battery of the sample new energy vehicle is used to supply power to the sample controller, and the sample controller is enabled to control the sample motor to rotate to the plurality of different sample rotation speeds, and then a second sample voltage of the sample motor at each sample rotation speed is respectively tested, wherein the sample motor rotates while driving a second load assembly to rotate, and the second load assembly comprises a wheel coupled with the rotation shaft of the sample motor and a connecting piece between the rotation shaft and the wheel; based on each first sample voltage and / or each second sample voltage, a plurality of first sample standard voltages and a plurality of second sample standard voltages corresponding to the plurality of different sample rotation speeds are determined; 3. The method of claim 2, wherein, the plurality of different sample rotation speeds and the plurality of first sample standard voltages corresponding thereto are used for fitting to obtain the first mapping relationship between the rotation speed and standard voltage, and the plurality of different sample rotation speeds and the plurality of second sample standard voltages corresponding thereto are used for fitting to obtain the second mapping relationship between the rotation speed and standard voltage. Based on each first sample voltage and / or each second sample voltage, a plurality of first sample standard voltages and a plurality of second sample standard voltages corresponding to the plurality of different sample rotation speeds are determined, which comprises the following steps: For each first sample voltage, the first sample voltage is respectively multiplied by a preset first percentage and a preset second percentage, to obtain a first sample standard voltage and a second sample standard voltage corresponding to a sample rotating speed to which the first sample voltage belongs; The second percentage is greater than the first percentage, and the difference between the two is within a preset percentage interval.

4. The method of claim 2, wherein, Based on each first sample voltage and / or each second sample voltage, determining a plurality of first sample standard voltages and a plurality of second sample standard voltages corresponding to the plurality of different sample rotating speeds, comprises: For each second sample voltage, the second sample voltage is respectively multiplied by a preset third percentage and a preset fourth percentage, to obtain a first sample standard voltage and a second sample standard voltage corresponding to a sample rotating speed to which the second sample voltage belongs; The fourth percentage is greater than the third percentage, and the difference between the two is within a preset percentage interval.

5. The method of claim 2, wherein, Based on each first sample voltage and / or each second sample voltage, determining a plurality of first sample standard voltages and a plurality of second sample standard voltages corresponding to the plurality of different sample rotating speeds, comprises: For each sample rotating speed, the first sample voltage and the second sample voltage are subjected to a weighted operation to obtain a weighted sample voltage corresponding to the sample rotating speed; The weighted sample voltage corresponding to the sample rotating speed is respectively multiplied by a preset fifth percentage and a preset sixth percentage, to obtain a first sample standard voltage and a second sample standard voltage corresponding to the sample rotating speed; wherein the sixth percentage is greater than the fifth percentage, and the difference between the two is within a preset percentage interval.

6. The method of claim 1, wherein, Before causing the vehicle-mounted controller to control the target motor to rotate to at least one target rotating speed, the method further comprises: Switching the working mode of the vehicle-mounted controller to a maintenance mode, the maintenance mode being used to instruct the vehicle-mounted controller to start controlling the target motor to rotate to the at least one target rotating speed.

7. The method of claim 1, wherein, Before causing the vehicle-mounted controller to control the target motor to rotate to at least one target rotating speed, the method further comprises: Lifting the new energy vehicle frame so that each wheel of the new energy vehicle is in a suspended state.

8. The method according to any one of claims 1 to 7, characterized in that, The method further comprises: if the ratio between the number of measured target voltages falling into the corresponding standard voltage interval and the total number of measured target voltages under all target rotating speeds is less than the preset ratio, it is determined that the performance of the target motor is unqualified.

9. The method of claim 8, wherein, After determining that the performance of the target motor is unqualified, the method further comprises: For each measured target voltage that does not fall into the corresponding standard voltage interval, calculating a voltage difference between the measured target voltage and the average of the corresponding first standard voltage and second standard voltage, denoted as a calculation voltage difference corresponding to the measured target voltage; For each measured target voltage that does not fall into the corresponding standard voltage interval, calculating an average of the calculation voltage differences corresponding to the measured target voltages, to obtain an average voltage difference; Confirming the voltage sub-interval into which the absolute value of the average voltage difference falls, and issuing an alarm signal corresponding to the voltage sub-interval; The voltage sub-interval is obtained by interval division of a preset voltage interval, and each voltage sub-interval has a corresponding warning signal.

10. A motor performance testing device for a new energy vehicle, characterized in that, The method comprises the steps of: The mapping relationship determination module is configured to determine a speed-standard voltage first mapping relationship and a speed-standard voltage second mapping relationship of a target motor to be tested on the new energy vehicle. The actual target voltage determination module is configured to supply power to a vehicle-mounted controller on the new energy vehicle by using a physical battery on the new energy vehicle, and to control the vehicle-mounted controller to control the target motor to be tested to rotate to at least one target speed, and then to test an actual target voltage of the target motor to be tested at each target speed. The standard voltage interval determination module is configured to, for each target speed, substitute the target speed into the speed-standard voltage first mapping relationship and the speed-standard voltage second mapping relationship to obtain a first standard voltage and a second standard voltage corresponding to the target speed, and to obtain a standard voltage interval corresponding to the target speed by taking the first standard voltage and the second standard voltage as interval endpoints. The motor performance judgment module is configured to, if the actual target voltages at the preset proportion of target speeds all fall within the corresponding standard voltage intervals, confirm that the performance of the target motor to be tested is qualified.

11. A storage medium having stored thereon a computer program, characterized in that The computer program is run by the processor to execute the steps of the motor performance test method of the new energy vehicle according to any one of claims 1 to 9.

12. An in-vehicle controller comprising a memory and a processor, the memory having stored thereon a computer program capable of running on the processor, characterized in that, The processor runs the computer program to execute the steps of the motor performance test method of the new energy vehicle according to any one of claims 1 to 9.

13. A new energy vehicle, characterized in that, The computer program is run by the processor to execute the steps of the motor performance test method of the new energy vehicle according to any one of claims 1 to 9.

14. A computer program product comprising a computer program, characterized in that, The computer program is run by the processor to execute the steps of the motor performance test method of the new energy vehicle according to any one of claims 1 to 9.

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