Electric drive transmission performance testing methods, apparatus, computer equipment, readable storage media, and program products

Abstract

This application relates to a method, apparatus, computer device, computer-readable storage medium, and computer program product for testing the performance of an electric drive transmission. The method includes: sending a gear shifting command to the electric drive transmission; sending a performance test command to a test system when the motor of the electric drive transmission shifts to a target gear based on the gear shifting command; controlling the drive axle to rotate at a target speed based on the performance test command to drive the motor to rotate accordingly; sending a torque output request to the electric drive transmission while the motor is rotating to cause the motor to rotate at a target torque; and acquiring operating parameters of the motor, the electric drive transmission, and the drive axle while the motor is rotating based on the target torque; and determining the performance of the electric drive transmission based on the operating parameters. The method provided in this application can effectively improve the performance of electric drive transmissions.

Description

Technical Field

[0001] This application relates to the field of electric vehicle testing technology, and in particular to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for testing the performance of an electric drive transmission. Background Technology

[0002] Electric drive transmissions, characterized by high power and fuel economy, are one of the core power components of new energy commercial vehicles, and their performance is a key factor in the overall vehicle quality competitiveness. To improve the performance of electric drive transmissions, bench testing is necessary before they are put into service.

[0003] Currently, tests on electric drive transmissions only focus on the transmission itself and cannot test its performance in the transmission system, thus failing to simulate its operation during vehicle operation. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for testing the performance of an electric drive transmission that can simulate the working conditions of an electric drive transmission during vehicle operation, in order to address the aforementioned technical problems.

[0005] In a first aspect, this application provides a method for testing the performance of an electric drive transmission. The corresponding testing system includes an electric drive transmission, a bearing housing, a drive axle, and a dynamometer connected in sequence. The method includes:

[0006] Send a gear shifting command to the electric drive transmission;

[0007] When the motor of the electric drive gearbox switches to the target gear based on the gear shift command, it sends a performance test command to the test system.

[0008] Based on the performance test command, the drive axle is controlled to rotate at the target speed to drive the motor to rotate accordingly;

[0009] When the motor is rotating, a torque output request is sent to the electric drive gearbox to make the motor rotate with a target torque, and when the motor rotates based on the target torque, the operating parameters of the motor, the electric drive gearbox and the drive axle are obtained;

[0010] The performance of the electric drive transmission is determined based on the aforementioned operating parameters.

[0011] In one embodiment, obtaining the operating parameters of the motor, the electric drive gearbox, and the drive axle includes:

[0012] The current speed and torque of the motor are obtained through the motor sensor, the output torque and output speed of the electric drive gearbox are obtained through the bearing housing, the torque and speed of the left wheel end of the drive axle are obtained through the first dynamometer, and the torque and speed of the right wheel end of the drive axle are obtained through the second dynamometer.

[0013] In one embodiment, determining the performance of the electric drive transmission based on the operating parameters includes:

[0014] The motor output power is determined based on the current speed and the current torque;

[0015] The output power of the electric drive transmission is determined based on the output torque and output speed of the electric drive transmission.

[0016] The drive axle output power is determined based on the left wheel end torque, the left wheel end speed, the right wheel end torque, and the right wheel end speed.

[0017] The performance of the electric drive transmission is determined based on the output power of the motor, the output power of the electric drive transmission, and the output power of the drive axle.

[0018] In one embodiment, determining the performance of the electric drive transmission based on the motor output power, the electric drive transmission output power, and the drive axle output power includes:

[0019] Obtain the system AC power and system DC power of the test system;

[0020] The mechanical efficiency of the electric drive transmission is determined based on the output power of the electric drive transmission and the output power of the motor.

[0021] The drive axle efficiency is determined based on the output power of the electric drive transmission and the output power of the drive axle.

[0022] The performance of the electric drive transmission is determined based on the output power of the motor, the output power of the electric drive transmission, the output power of the drive axle, the AC power of the system, the DC power of the system, the mechanical efficiency, and the efficiency of the drive axle.

[0023] In one embodiment, determining the performance of the electric drive transmission based on the motor output power, the electric drive transmission output power, the drive axle output power, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency includes:

[0024] The motor efficiency is determined based on the system's AC power and the motor's output power.

[0025] The overall efficiency of the electric drive transmission is determined based on the AC power of the system and the output power of the electric drive transmission.

[0026] The inverter efficiency is determined based on the system's AC power and DC power.

[0027] The system efficiency of the electric drive transmission is determined based on the system's DC power and the output power of the electric drive transmission.

[0028] The efficiency of the transmission system is determined based on the output power of the drive axle and the DC power of the system.

[0029] The performance of the electric drive gearbox is determined based on the mechanical efficiency, the drive axle efficiency, the motor efficiency, the assembly efficiency, the inverter efficiency, the system efficiency, and the transmission system efficiency.

[0030] In one embodiment, the dynamometer is used to simulate the driving resistance of a vehicle, which includes rolling resistance, air resistance, gradient resistance, and acceleration resistance.

[0031] Secondly, this application also provides an electric drive transmission performance testing device, the device comprising:

[0032] The first sending module is used to send a gear shifting command to the electric drive transmission;

[0033] The second sending module is used to send a performance test command to the test system when the motor of the electric drive gearbox switches to the target gear based on the gear shift command;

[0034] The control module is used to control the drive axle to rotate at a target speed based on the performance test command, so as to drive the motor to rotate accordingly;

[0035] The third sending module is used to send a torque output request to the electric drive gearbox when the motor is in a rotating state, so that the motor rotates with a target torque, and to obtain the operating parameters of the motor, the electric drive gearbox and the drive axle when the motor rotates based on the target torque.

[0036] A determination module is used to determine the performance of the electric drive transmission based on the operating parameters.

[0037] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the methods in any of the above embodiments.

[0038] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the methods in any of the above embodiments.

[0039] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the steps of the methods in any of the above embodiments.

[0040] The aforementioned electric drive transmission performance testing method, apparatus, computer equipment, computer-readable storage medium, and computer program product send a gear shifting command to the electric drive transmission; when the motor of the electric drive transmission shifts to the target gear based on the gear shifting command, a performance test command is sent to the testing system; based on the performance test command, the drive axle is controlled to rotate at a target speed to drive the motor to rotate accordingly; while the motor is rotating, a torque output request is sent to the electric drive transmission to make the motor rotate at the target torque, and while the motor is rotating based on the target torque, the operating parameters of the motor, electric drive transmission, and drive axle are acquired; the performance of the electric drive transmission is determined based on the operating parameters. The method provided in this application can simulate the working conditions of the electric drive transmission during vehicle operation, thereby effectively improving the performance of the electric drive transmission. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a diagram illustrating the application environment of an electric drive transmission performance testing method in one embodiment.

[0043] Figure 2 This is a flowchart illustrating a performance testing method for an electric drive transmission in one embodiment;

[0044] Figure 3 This is a flowchart illustrating a method for determining the performance of an electric drive transmission in one embodiment;

[0045] Figure 4 This is a structural block diagram of an electric drive gearbox performance testing device in one embodiment;

[0046] Figure 5 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0047] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0048] The electric drive transmission performance testing method provided in this application embodiment can be applied to, for example... Figure 1 The application environment shown. Among them, Figure 1 In the diagram, 1 is the battery simulator, 2 is the power analyzer, 3 is the motor controller, 4 is the first motor, 5 is the second motor, 6 is the first motor sensor, 7 is the second motor sensor, 8 is the electric drive gearbox body, 9 is the bearing housing, 10 is the drive axle, 11 is the first dynamometer, 12 is the second dynamometer, 13 is the water temperature control unit, 14 is the first oil temperature control unit, 15 is the second oil temperature control unit, 16 is the controller DC wiring harness, 17 is the first motor three-phase wiring harness, and 18 is the second motor three-phase wiring harness. Among them, the battery simulator 1 is used to provide working voltage and current to the motor controller 3, the motor controller 3 is used to send target torque or target speed command requests to the motor, the first dynamometer 11 and the second dynamometer 12 are used to measure the output speed and output torque of the left and right wheel ends of the drive axle in the system, the bearing housing 9 is used to measure the output speed and output torque of the electric drive gearbox 8, the first motor sensor 6 and the second motor sensor 7 are used to measure the output speed and output torque of the first motor 4 and the second motor 5 of the electric drive gearbox 8, respectively, the power analyzer 2 is used to measure the DC power of the motor controller 3 and the AC power of the first motor 4 and the second motor 5, the water temperature control unit 13 is used to heat / cool the cooling water of the motor and the motor controller 3 and control the water temperature within a specified range, the first oil temperature control unit 14 is used to heat / cool the lubricating oil of the electric drive gearbox 8 and control the oil temperature within a specified range, and the second oil temperature control unit 15 is used to heat / cool the lubricating oil of the drive axle and control the oil temperature within a specified range.

[0049] In one exemplary embodiment, such as Figure 2 As shown, a method for testing the performance of an electric drive transmission is provided. The corresponding testing system includes an electric drive transmission, a bearing housing, a drive axle, and a dynamometer connected in sequence. This method is applied to... Figure 1 Taking the motor controller as an example, the explanation includes the following steps 202 to 210. Wherein:

[0050] S202, Send a gear shift command to the electric drive transmission.

[0051] The gear shifting command is used to control the motor of the electric drive transmission to operate in the target gear, such as 1st gear or 2nd gear. Figure 1 As shown, the oil temperature of the lubricating oil in the electric drive transmission and the lubricating oil in the drive axle can both be set to 85℃.

[0052] S204. When the motor of the electric drive gearbox switches to the target gear based on the gear shift command, a performance test command is sent to the test system.

[0053] The schematic diagram of the test system is as follows: Figure 1 As shown, when both the first and second motors are switched to the target gear, the motor controller will send a performance test command to the test system.

[0054] S206. Based on the performance test command, control the drive axle to rotate at the target speed so as to drive the motor to rotate accordingly.

[0055] The first and second dynamometers increase the speed of the drive axle to the target speed through the drive axle wheel end. The input end of the drive axle is connected to the output end of the electric drive gearbox, so that the motor of the electric drive gearbox rotates at a constant speed.

[0056] S208. When the motor is rotating, send a torque output request to the electric drive gearbox so that the motor rotates with the target torque, and when the motor is rotating based on the target torque, obtain the operating parameters of the motor, the electric drive gearbox and the drive axle.

[0057] After the motor speed stabilizes, a torque output request is sent to both the first and second motors, causing them to rotate at the target torque, and the corresponding operating parameters are recorded. After recording, a new torque output request is sent to both motors, causing them to rotate at a new target torque greater than the previous one, and the new operating parameters are recorded. This process is repeated until the target torque reaches the maximum allowable torque for both motors at the target speed. The determination of the maximum allowable torque for the motors is shown in the following formula:

[0058]

[0059] In the formula, This is the maximum allowable torque of the motor. This is the current speed of the motor. This represents the peak power of the first and second motors.

[0060] S210. Determine the performance of the electric drive transmission based on operating parameters.

[0061] After obtaining the operating parameters of the motor, electric drive transmission, and drive axle, further processing of these parameters allows for a comprehensive analysis of the electric drive transmission. For example, the mechanical efficiency, drive axle efficiency, motor efficiency, assembly efficiency, inverter efficiency, system efficiency of the electric drive transmission, and transmission system efficiency can be calculated based on the operating parameters. Based on these calculated data, the performance of the electric drive transmission can be analyzed.

[0062] In the aforementioned electric drive transmission performance testing method, a gear shifting command is sent to the electric drive transmission; when the motor of the electric drive transmission shifts to the target gear based on the gear shifting command, a performance test command is sent to the testing system; based on the performance test command, the drive axle is controlled to rotate at the target speed to drive the motor to rotate accordingly; while the motor is rotating, a torque output request is sent to the electric drive transmission to make the motor rotate at the target torque, and while the motor is rotating based on the target torque, the operating parameters of the motor, the electric drive transmission, and the drive axle are obtained; the performance of the electric drive transmission is determined based on the operating parameters. The method provided in this application can simulate the working conditions of the electric drive transmission during vehicle operation, thereby effectively improving the performance of the electric drive transmission.

[0063] In some embodiments, obtaining the operating parameters of the motor, the electric drive gearbox, and the drive axle includes: obtaining the current speed and current torque of the motor through a motor sensor, obtaining the output torque and output speed of the electric drive gearbox through a bearing housing, obtaining the left wheel end torque and left wheel end speed of the drive axle through a first dynamometer, and obtaining the right wheel end torque and right wheel end speed of the drive axle through a second dynamometer.

[0064] Among them, such as Figure 1 As shown, the current speed and torque of the first motor are obtained through the first motor sensor, and the current speed and torque of the second motor are obtained through the second motor sensor.

[0065] In this embodiment, by acquiring the operating parameters of the motor, electric drive gearbox, and drive axle, the performance of the electric drive gearbox can be accurately analyzed, thereby improving the quality of the electric drive gearbox.

[0066] In some embodiments, such as Figure 3 As shown, the performance of the electric drive transmission is determined based on operating parameters, including:

[0067] S302. Determine the motor output power based on the current speed and current torque.

[0068] S304. Determine the output power of the electric drive transmission based on its output torque and output speed.

[0069] S306. Based on the left wheel end torque, left wheel end speed, right wheel end torque, and right wheel end speed, determine the drive axle output power.

[0070] S308. Based on the output power of the motor, the output power of the electric drive transmission, and the output power of the drive axle, the performance of the electric drive transmission is determined.

[0071] The process for determining the motor output power is shown in the following formula:

[0072]

[0073] In the formula, This refers to the motor's output power. and These are the current speeds of the first motor and the second motor, respectively. and These are the current torques of the first motor and the second motor, respectively.

[0074] The process for determining the output power of an electric drive transmission is shown in the following formula:

[0075]

[0076] In the formula, For the output power of the electric drive transmission, The output speed of the electric drive gearbox. This refers to the output torque of the electric drive transmission.

[0077] The process for determining the output power of the drive axle is shown in the following formula:

[0078]

[0079] In the formula, For the output power of the drive axle, The rotational speed of the left wheel end. The rotational speed of the right wheel end. This refers to the torque at the left wheel end. This represents the torque at the right wheel end.

[0080] In this embodiment, by calculating the output power of the motor, the output power of the electric drive gearbox, and the output power of the drive axle, the performance analysis of the electric drive gearbox is made more accurate.

[0081] In some embodiments, determining the performance of the electric drive transmission based on the motor output power, the output power of the electric drive transmission, and the output power of the drive axle includes: acquiring the system AC power and system DC power of the test system; determining the mechanical efficiency of the electric drive transmission based on the output power of the electric drive transmission and the motor output power; determining the drive axle efficiency based on the output power of the electric drive transmission and the drive axle output power; and determining the performance of the electric drive transmission based on the motor output power, the output power of the electric drive transmission, the drive axle output power, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency.

[0082] The process for determining the mechanical efficiency of the electric drive transmission is shown in the following formula:

[0083]

[0084] In the formula, This refers to the mechanical efficiency of the electric drive gearbox.

[0085] The process for determining the drive axle efficiency is shown in the following formula:

[0086]

[0087] In the formula, To improve the efficiency of the drive axle.

[0088] In this embodiment, the performance analysis of the electric drive transmission is made more accurate by calculating the mechanical efficiency of the electric drive transmission and the efficiency of the drive axle.

[0089] In some embodiments, determining the performance of the electric drive transmission based on the motor output power, the output power of the electric drive transmission, the drive axle output power, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency includes: determining the motor efficiency based on the system AC power and the motor output power; determining the overall efficiency of the electric drive transmission based on the system AC power and the output power of the electric drive transmission; determining the inverter efficiency based on the system AC power and the system DC power; determining the system efficiency of the electric drive transmission based on the system DC power and the output power of the electric drive transmission; determining the transmission system efficiency based on the drive axle output power and the system DC power; and determining the performance of the electric drive transmission based on the mechanical efficiency, drive axle efficiency, motor efficiency, overall efficiency, inverter efficiency, system efficiency, and transmission system efficiency.

[0090] The process for determining the motor efficiency is shown in the following formula:

[0091]

[0092] In the formula, For motor efficiency, The system's AC power can be obtained using a power analyzer.

[0093] The process for determining the overall efficiency of an electric drive transmission is shown in the following formula:

[0094]

[0095] In the formula, The overall efficiency of the electric drive transmission.

[0096] The process for determining inverter efficiency is shown in the following formula:

[0097]

[0098] In the formula, For inverter efficiency, This represents the system's DC power.

[0099] The process for determining the system efficiency of an electric drive transmission is shown in the following formula:

[0100]

[0101] In the formula, This refers to the system efficiency of the electric drive transmission.

[0102] The process for determining the efficiency of a transmission system is shown in the following formula:

[0103]

[0104] In the formula, For transmission system efficiency.

[0105] In this embodiment, by calculating the efficiency of the motor, the overall efficiency of the electric drive gearbox, the inverter efficiency, the system efficiency of the electric drive gearbox, and the transmission system efficiency, the performance analysis of the electric drive gearbox is made more accurate.

[0106] In some embodiments, the dynamometer is used to simulate the driving resistance of a vehicle, including rolling resistance, air resistance, gradient resistance, and acceleration resistance.

[0107] Among them, such as Figure 1 As shown, the dynamometer is connected to the wheel ends of the drive axle via a drive shaft. The dynamometer includes setting modules for each type of driving resistance, and the driving resistance of the dynamometer can be dynamically adjusted in real time according to the parameters of each setting module.

[0108] In this embodiment, a dynamometer is used to simulate the driving resistance of a vehicle during the test, making the test results more consistent with the actual working conditions of the vehicle during driving.

[0109] In one embodiment, another method for testing the performance of an electric drive transmission is provided, the method comprising the following:

[0110] Efficiency test conditions are designed based on motor characteristics, including: motor peak power, motor peak torque, motor peak speed, motor rated power, motor rated torque, and motor rated speed.

[0111] The tested electric drive gearbox and drive axle were mounted on a comprehensive test bench for efficiency testing.

[0112] During the efficiency test of the electric drive gearbox, the feedback torque, feedback speed, AC power, DC power, output speed, and output torque of the electric drive gearbox system, as well as the torque and speed at the drive axle wheel end, were recorded when the motor moved in each gear. Based on these parameters, the system efficiency, inverter efficiency, electric drive gearbox efficiency, motor efficiency, and mechanical efficiency of the electric drive gearbox were calculated.

[0113] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0114] Based on the same inventive concept, this application also provides an electric drive transmission performance testing device for implementing the above-described electric drive transmission performance testing method. The solution provided by this device is similar to the implementation described in the above method; therefore, the specific limitations in one or more embodiments of the electric drive transmission performance testing device provided below can be found in the limitations of the electric drive transmission performance testing method described above, and will not be repeated here.

[0115] In one exemplary embodiment, such as Figure 4 As shown, an electric drive transmission performance testing device 400 is provided, comprising: a first sending module 401, a second sending module 402, a control module 403, a third sending module 404, and a determining module 405, wherein:

[0116] The first sending module 401 is used to send a gear shifting command to the electric drive gearbox.

[0117] The second sending module 402 is used to send a performance test command to the test system when the motor of the electric drive gearbox switches to the target gear based on the gear shifting command.

[0118] The control module 403 is used to control the drive axle to rotate at a target speed based on the performance test command, so as to drive the motor to rotate accordingly.

[0119] The third sending module 404 is used to send a torque output request to the electric drive gearbox when the motor is in a rotating state, so that the motor rotates with a target torque, and to obtain the operating parameters of the motor, the electric drive gearbox and the drive axle when the motor rotates based on the target torque.

[0120] The determining module 405 is used to determine the performance of the electric drive transmission based on the operating parameters.

[0121] In some embodiments, the third sending module 404 is further configured to acquire the current speed and current torque of the motor through the motor sensor, acquire the output torque and output speed of the electric drive gearbox through the bearing housing, acquire the left wheel end torque and left wheel end speed of the drive axle through the first dynamometer, and acquire the right wheel end torque and right wheel end speed of the drive axle through the second dynamometer.

[0122] In some embodiments, the determining module 405 includes:

[0123] The first determining submodule is used to determine the motor output power based on the current speed and the current torque.

[0124] The second determining submodule is used to determine the output power of the electric drive transmission based on the output torque and output speed of the electric drive transmission.

[0125] The third determining submodule is used to determine the output power of the drive axle based on the left wheel end torque, the left wheel end speed, the right wheel end torque, and the right wheel end speed;

[0126] The fourth determining submodule is used to determine the performance of the electric drive gearbox based on the output power of the motor, the output power of the electric drive gearbox, and the output power of the drive axle.

[0127] In some embodiments, the fourth determining submodule includes:

[0128] The acquisition unit is used to acquire the system AC power and system DC power of the test system.

[0129] The first determining unit is used to determine the mechanical efficiency of the electric drive transmission based on the output power of the electric drive transmission and the output power of the motor.

[0130] The second determining unit is used to determine the drive axle efficiency based on the output power of the electric drive gearbox and the output power of the drive axle.

[0131] The third determining unit is used to determine the performance of the electric drive gearbox based on the output power of the motor, the output power of the electric drive gearbox, the output power of the drive axle, the AC power of the system, the DC power of the system, the mechanical efficiency, and the efficiency of the drive axle.

[0132] In some embodiments, the third determining unit is further configured to: determine motor efficiency based on the system AC power and the motor output power; determine the assembly efficiency of the electric drive transmission based on the system AC power and the output power of the electric drive transmission; determine inverter efficiency based on the system AC power and the system DC power; determine the system efficiency of the electric drive transmission based on the system DC power and the output power of the electric drive transmission; determine transmission system efficiency based on the drive axle output power and the system DC power; and determine the performance of the electric drive transmission based on the mechanical efficiency, the drive axle efficiency, the motor efficiency, the assembly efficiency, the inverter efficiency, the system efficiency, and the transmission system efficiency.

[0133] In some embodiments, the electric drive transmission performance testing device 400 is specifically used as a dynamometer to simulate the driving resistance during vehicle operation, the driving resistance including rolling resistance, air resistance, gradient resistance and acceleration resistance.

[0134] Each module in the aforementioned electric drive transmission performance testing device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0135] In one exemplary embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 5As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When executed by the processor, the computer program implements a method for testing the performance of an electric drive gearbox. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0136] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0137] In an exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor, when executing the computer program, performs the following steps: sending a gear shifting command to the electric drive transmission; when the motor of the electric drive transmission shifts to a target gear based on the gear shifting command, sending a performance test command to the test system; based on the performance test command, controlling the drive axle to rotate at a target speed to drive the motor to rotate accordingly; when the motor is rotating, sending a torque output request to the electric drive transmission to cause the motor to rotate at a target torque, and when the motor rotates based on the target torque, acquiring operating parameters of the motor, the electric drive transmission, and the drive axle; and determining the performance of the electric drive transmission based on the operating parameters.

[0138] In one embodiment, the acquisition of operating parameters of the motor, the electric drive gearbox, and the drive axle by the processor executing the computer program includes: acquiring the current speed and current torque of the motor through a motor sensor; acquiring the output torque and output speed of the electric drive gearbox through the bearing housing; acquiring the left wheel end torque and left wheel end speed of the drive axle through a first dynamometer; and acquiring the right wheel end torque and right wheel end speed of the drive axle through a second dynamometer.

[0139] In one embodiment, the process of determining the performance of the electric drive transmission based on the operating parameters, implemented by the processor executing a computer program, includes: determining the motor output power based on the current rotational speed and the current torque; determining the output power of the electric drive transmission based on the output torque and output rotational speed of the electric drive transmission; determining the drive axle output power based on the left wheel-end torque, the left wheel-end rotational speed, the right wheel-end torque, and the right wheel-end rotational speed; and determining the performance of the electric drive transmission based on the motor output power, the output power of the electric drive transmission, and the drive axle output power.

[0140] In one embodiment, the process of determining the performance of the electric drive transmission based on the output power of the motor, the output power of the electric drive transmission, and the output power of the drive axle, implemented by the processor executing a computer program, includes: acquiring the system AC power and system DC power of the test system; determining the mechanical efficiency of the electric drive transmission based on the output power of the electric drive transmission and the output power of the motor; determining the drive axle efficiency based on the output power of the electric drive transmission and the output power of the drive axle; and determining the performance of the electric drive transmission based on the output power of the motor, the output power of the electric drive transmission, the output power of the drive axle, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency.

[0141] In one embodiment, the processor, when executing a computer program, determines the performance of the electric drive transmission based on the motor output power, the electric drive transmission output power, the drive axle output power, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency, including: determining the motor efficiency based on the system AC power and the motor output power; determining the overall efficiency of the electric drive transmission based on the system AC power and the electric drive transmission output power; determining the inverter efficiency based on the system AC power and the system DC power; determining the system efficiency of the electric drive transmission based on the system DC power and the electric drive transmission output power; determining the transmission system efficiency based on the drive axle output power and the system DC power; and determining the performance of the electric drive transmission based on the mechanical efficiency, the drive axle efficiency, the motor efficiency, the overall efficiency, the inverter efficiency, the system efficiency, and the transmission system efficiency.

[0142] In one embodiment, the dynamometer implemented by the processor when executing the computer program is used to simulate the driving resistance during vehicle operation, the driving resistance including rolling resistance, air resistance, gradient resistance and acceleration resistance.

[0143] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon. When executed by a processor, the computer program performs the following steps: sending a gear shifting command to the electric drive transmission; when the motor of the electric drive transmission shifts to a target gear based on the gear shifting command, sending a performance test command to the test system; based on the performance test command, controlling the drive axle to rotate at a target speed to drive the motor to rotate accordingly; when the motor is rotating, sending a torque output request to the electric drive transmission to cause the motor to rotate at a target torque, and when the motor rotates based on the target torque, acquiring operating parameters of the motor, the electric drive transmission, and the drive axle; and determining the performance of the electric drive transmission based on the operating parameters.

[0144] In one embodiment, the computer program, when executed by a processor, acquires the operating parameters of the motor, the electric drive gearbox, and the drive axle, including: acquiring the current speed and current torque of the motor via a motor sensor; acquiring the output torque and output speed of the electric drive gearbox via the bearing housing; acquiring the left wheel end torque and left wheel end speed of the drive axle via a first dynamometer; and acquiring the right wheel end torque and right wheel end speed of the drive axle via a second dynamometer.

[0145] In one embodiment, the computer program, when executed by a processor, determines the performance of the electric drive transmission based on the operating parameters, including: determining the motor output power based on the current rotational speed and the current torque; determining the output power of the electric drive transmission based on the output torque and output rotational speed of the electric drive transmission; determining the drive axle output power based on the left wheel-end torque, the left wheel-end rotational speed, the right wheel-end torque, and the right wheel-end rotational speed; and determining the performance of the electric drive transmission based on the motor output power, the output power of the electric drive transmission, and the drive axle output power.

[0146] In one embodiment, the computer program, when executed by a processor, determines the performance of the electric drive transmission based on the output power of the motor, the output power of the electric drive transmission, and the output power of the drive axle, including: acquiring the system AC power and system DC power of the test system; determining the mechanical efficiency of the electric drive transmission based on the output power of the electric drive transmission and the output power of the motor; determining the drive axle efficiency based on the output power of the electric drive transmission and the output power of the drive axle; and determining the performance of the electric drive transmission based on the output power of the motor, the output power of the electric drive transmission, the output power of the drive axle, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency.

[0147] In one embodiment, when a computer program is executed by a processor, determining the performance of the electric drive transmission based on the motor output power, the output power of the electric drive transmission, the drive axle output power, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency includes: determining the motor efficiency based on the system AC power and the motor output power; determining the assembly efficiency of the electric drive transmission based on the system AC power and the output power of the electric drive transmission; determining the inverter efficiency based on the system AC power and the system DC power; determining the system efficiency of the electric drive transmission based on the system DC power and the output power of the electric drive transmission; determining the transmission system efficiency based on the drive axle output power and the system DC power; and determining the performance of the electric drive transmission based on the mechanical efficiency, the drive axle efficiency, the motor efficiency, the assembly efficiency, the inverter efficiency, the system efficiency, and the transmission system efficiency.

[0148] In one embodiment, the dynamometer implemented when the computer program is executed by the processor is used to simulate the driving resistance of a vehicle, which includes rolling resistance, air resistance, gradient resistance, and acceleration resistance.

[0149] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps: sending a gear shifting command to the electric drive transmission; when the motor of the electric drive transmission shifts to a target gear based on the gear shifting command, sending a performance test command to the test system; based on the performance test command, controlling the drive axle to rotate at a target speed to drive the motor to rotate accordingly; when the motor is rotating, sending a torque output request to the electric drive transmission to cause the motor to rotate at a target torque, and when the motor rotates based on the target torque, acquiring operating parameters of the motor, the electric drive transmission, and the drive axle; and determining the performance of the electric drive transmission based on the operating parameters.

[0150] In one embodiment, the computer program, when executed by a processor, acquires the operating parameters of the motor, the electric drive gearbox, and the drive axle, including: acquiring the current speed and current torque of the motor via a motor sensor; acquiring the output torque and output speed of the electric drive gearbox via the bearing housing; acquiring the left wheel end torque and left wheel end speed of the drive axle via a first dynamometer; and acquiring the right wheel end torque and right wheel end speed of the drive axle via a second dynamometer.

[0151] In one embodiment, the computer program, when executed by a processor, determines the performance of the electric drive transmission based on the operating parameters, including: determining the motor output power based on the current rotational speed and the current torque; determining the output power of the electric drive transmission based on the output torque and output rotational speed of the electric drive transmission; determining the drive axle output power based on the left wheel-end torque, the left wheel-end rotational speed, the right wheel-end torque, and the right wheel-end rotational speed; and determining the performance of the electric drive transmission based on the motor output power, the output power of the electric drive transmission, and the drive axle output power.

[0152] In one embodiment, the computer program, when executed by a processor, determines the performance of the electric drive transmission based on the output power of the motor, the output power of the electric drive transmission, and the output power of the drive axle, including: acquiring the system AC power and system DC power of the test system; determining the mechanical efficiency of the electric drive transmission based on the output power of the electric drive transmission and the output power of the motor; determining the drive axle efficiency based on the output power of the electric drive transmission and the output power of the drive axle; and determining the performance of the electric drive transmission based on the output power of the motor, the output power of the electric drive transmission, the output power of the drive axle, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency.

[0153] In one embodiment, when a computer program is executed by a processor, determining the performance of the electric drive transmission based on the motor output power, the output power of the electric drive transmission, the drive axle output power, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency includes: determining the motor efficiency based on the system AC power and the motor output power; determining the assembly efficiency of the electric drive transmission based on the system AC power and the output power of the electric drive transmission; determining the inverter efficiency based on the system AC power and the system DC power; determining the system efficiency of the electric drive transmission based on the system DC power and the output power of the electric drive transmission; determining the transmission system efficiency based on the drive axle output power and the system DC power; and determining the performance of the electric drive transmission based on the mechanical efficiency, the drive axle efficiency, the motor efficiency, the assembly efficiency, the inverter efficiency, the system efficiency, and the transmission system efficiency.

[0154] In one embodiment, the dynamometer implemented when the computer program is executed by the processor is used to simulate the driving resistance of a vehicle, which includes rolling resistance, air resistance, gradient resistance, and acceleration resistance.

[0155] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0156] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0157] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0158] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for testing the performance of an electric drive transmission, characterized in that, The corresponding testing system for the method includes an electric drive gearbox, a bearing housing, a drive axle, a first dynamometer, and a second dynamometer connected in sequence; the method includes: Send a gear shifting command to the electric drive transmission; When the motor of the electric drive gearbox switches to the target gear based on the gear shift command, it sends a performance test command to the test system. Based on the performance test command, the drive axle is controlled to rotate at the target speed to drive the motor to rotate accordingly; When the motor is rotating, a torque output request is sent to the electric drive gearbox to make the motor rotate with a target torque, and when the motor rotates based on the target torque, the operating parameters of the motor, the electric drive gearbox and the drive axle are obtained; The step of obtaining the operating parameters of the motor, the electric drive gearbox, and the drive axle includes: obtaining the current speed and current torque of the motor through the motor sensor, obtaining the output torque and output speed of the electric drive gearbox through the bearing housing, obtaining the left wheel end torque and left wheel end speed of the drive axle through the first dynamometer, and obtaining the right wheel end torque and right wheel end speed of the drive axle through the second dynamometer. The performance of the electric drive transmission is determined based on the aforementioned operating parameters; Determining the performance of the electric drive transmission based on the operating parameters includes: determining the motor output power based on the current speed and the current torque; determining the output power of the electric drive transmission based on the output torque and output speed of the electric drive transmission; determining the drive axle output power based on the left wheel end torque, the left wheel end speed, the right wheel end torque, and the right wheel end speed; and determining the performance of the electric drive transmission based on the motor output power, the electric drive transmission output power, and the drive axle output power.

2. The method according to claim 1, characterized in that, Determining the performance of the electric drive transmission based on the motor output power, the electric drive transmission output power, and the drive axle output power includes: Obtain the system AC power and system DC power of the test system; The mechanical efficiency of the electric drive transmission is determined based on the output power of the electric drive transmission and the output power of the motor. The drive axle efficiency is determined based on the output power of the electric drive transmission and the output power of the drive axle. The performance of the electric drive gearbox is determined based on the output power of the motor, the output power of the electric drive gearbox, the output power of the drive axle, the AC power of the system, the DC power of the system, the mechanical efficiency, and the efficiency of the drive axle.

3. The method according to claim 2, characterized in that, The process of determining the performance of the electric drive transmission based on the motor output power, the electric drive transmission output power, the drive axle output power, the system AC power, the system DC power, the mechanical efficiency, and the drive axle efficiency includes: The motor efficiency is determined based on the system's AC power and the motor's output power. The overall efficiency of the electric drive transmission is determined based on the AC power of the system and the output power of the electric drive transmission. The inverter efficiency is determined based on the system's AC power and DC power. The system efficiency of the electric drive transmission is determined based on the system's DC power and the output power of the electric drive transmission. The efficiency of the transmission system is determined based on the output power of the drive axle and the DC power of the system. The performance of the electric drive gearbox is determined based on the mechanical efficiency, the drive axle efficiency, the motor efficiency, the assembly efficiency, the inverter efficiency, the system efficiency, and the transmission system efficiency.

4. The method according to claim 1, characterized in that, Both the first dynamometer and the second dynamometer are used to simulate the driving resistance during vehicle operation, which includes rolling resistance, air resistance, gradient resistance, and acceleration resistance.

5. A performance testing device for an electric drive transmission, characterized in that, The apparatus is used in the method according to any one of claims 1 to 4; the apparatus comprises: The first sending module is used to send a gear shifting command to the electric drive transmission; The second sending module is used to send a performance test command to the test system when the motor of the electric drive gearbox switches to the target gear based on the gear shift command; The control module is used to control the drive axle to rotate at a target speed based on the performance test command, so as to drive the motor to rotate accordingly; The third sending module is used to send a torque output request to the electric drive gearbox when the motor is in a rotating state, so that the motor rotates with a target torque, and to obtain the operating parameters of the motor, the electric drive gearbox and the drive axle when the motor rotates based on the target torque. The third transmitting module is also used to obtain the current speed and current torque of the motor through the motor sensor, obtain the output torque and output speed of the electric drive gearbox through the bearing housing, obtain the left wheel end torque and left wheel end speed of the drive axle through the first dynamometer, and obtain the right wheel end torque and right wheel end speed of the drive axle through the second dynamometer. The determining module is used to determine the performance of the electric drive transmission based on the operating parameters; The determining module includes: The first determining submodule is used to determine the motor output power based on the current speed and the current torque; The second determining submodule is used to determine the output power of the electric drive transmission based on the output torque and output speed of the electric drive transmission; The third determining submodule is used to determine the output power of the drive axle based on the left wheel end torque, the left wheel end speed, the right wheel end torque, and the right wheel end speed; The fourth determining submodule is used to determine the performance of the electric drive gearbox based on the output power of the motor, the output power of the electric drive gearbox, and the output power of the drive axle.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

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