Electric drive assembly testing method and device, electronic equipment and storage medium

Abstract

The present application relates to a testing method and device, electronic device and storage medium for an electric drive assembly, wherein the method comprises: moving a mobile platform mechanism to a central position, wherein the electric drive assembly is placed on the mobile platform mechanism; moving the mobile platform mechanism within a preset range at a unit distance in a rectangular coordinate system, and determining the torque difference between the left and right half-axles of the current electric drive assembly each time the mobile platform mechanism is moved; when the torque difference is less than a preset threshold, determining the current position of the mobile platform mechanism within the preset range as the test position of the electric drive assembly, and performing a bench test on the electric drive assembly at the test position. Through the present application, the problem in the prior art of the test being obstructed due to the excessive torque difference between the left and right half-axles when performing a bench test on the electric drive assembly is solved.

Description

Technical Field

[0001] The present application relates to the field of automobile testing technology, and in particular to a testing method and device for an electric drive assembly, an electronic device, and a storage medium. Background Art

[0002] Currently, when bench testing the electric drive assembly of new energy vehicles, the left and right axles provide torque. Therefore, when installing the test sample, the left and right axles should be aligned on the dynamometer to avoid torque differences. However, due to vehicle layout, the left and right axles may have different lengths. When the axles are at a certain angle to the dynamometer, the length of the left and right axles' lever arms differ, resulting in torque deviations.

[0003] During testing, if the torque difference is too large, one half-axle will bear a heavy load for a long time, which may lead to premature failure. Bench dynamometers can adjust the torque difference by adjusting the speed of the left and right dynamometers. However, due to the limited response speed of the speed control, in actual adjustment, the torque of the left and right half-axles often increases alternately, making adjustment more difficult during dynamic operating condition testing. If the adjustment force is too strong, the prototype will be in a state of obvious differential speed, which is not conducive to the test. Summary of the Invention

[0004] The present application provides a testing method and device for an electric drive assembly, an electronic device, and a storage medium to solve the problem in the prior art that, when performing bench testing on an electric drive assembly, the torque difference between the left and right half-axles is too large, resulting in obstruction of the test.

[0005] In the first aspect, the present application provides a testing method for an electric drive assembly, comprising: moving a mobile platform mechanism to a center position, wherein the electric drive assembly is placed on the mobile platform mechanism; the center position is the center origin of a preset range, the center origin of the preset range is the origin of a rectangular coordinate system, the straight line where the X-axis is located is parallel to the axial direction of a bench dynamometer used to test the electric drive assembly, the Y-axis is perpendicular to the axial direction of the bench dynamometer, and the boundary points of the preset range within the rectangular coordinate system are critical values ​​for testing the electric drive assembly; moving the mobile platform mechanism within the preset range at a unit distance within the rectangular coordinate system, and determining the torque difference between the current left and right half-shafts of the electric drive assembly each time it moves; when the torque difference is less than a preset threshold, determining the current position of the mobile platform mechanism within the preset range as the test position of the electric drive assembly, and performing a bench test on the electric drive assembly at the test position.

[0006] In a second aspect, the present application provides a testing device for an electric drive assembly, comprising: a first processing module, configured to move a mobile platform mechanism to a center position, wherein the electric drive assembly is placed on the mobile platform mechanism; the center position is the center origin of a preset range, the center origin of the preset range is the origin of a rectangular coordinate system, the straight line where the X-axis is located is parallel to the axial direction of a bench dynamometer used to test the electric drive assembly, the Y-axis is perpendicular to the axial direction of the bench dynamometer, and the boundary points of the preset range within the rectangular coordinate system are critical values ​​for testing the electric drive assembly; a second processing module, configured to move the mobile platform mechanism within the preset range at a unit distance within the rectangular coordinate system, and determine the torque difference between the current left and right half-shafts of the electric drive assembly each time the movement is performed; and a third processing module, configured to determine, when the torque difference is less than a preset threshold, the current position of the mobile platform mechanism within the preset range as the test position of the electric drive assembly, and perform a bench test on the electric drive assembly at the test position.

[0007] In a third aspect, the present application provides an electronic device comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the processor is configured to execute the test method for the electric drive assembly described in the first aspect of the present application.

[0008] In a fourth aspect, the present application further provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the test method of the electric drive assembly described in the first aspect of the present application.

[0009] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: in the embodiment of the present application, by moving the mobile platform mechanism on which the electric drive assembly is placed, the torque difference between the left and right half-axles of the current electric drive assembly is determined each time a unit distance is moved. If the current torque difference is not less than a preset threshold, the mobile platform mechanism is continued to be moved until a position corresponding to a torque difference less than the preset threshold is found, and the electric drive assembly is bench tested at this position. It can be seen that in the embodiment of the present application, the mobile platform mechanism can be moved so that the torque difference between the left and right half-axles of the electric drive assembly reaches the preset expectation, and then the electric drive assembly is bench tested, thereby ensuring the safety and accuracy of the bench test of the electric drive assembly, and solving the problem in the prior art that when the electric drive assembly is bench tested, the torque difference between the left and right half-axles is too large, resulting in obstruction of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0012] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0013] Figure 1 A flowchart of a method for testing an electric drive assembly provided in an embodiment of the present application;

[0014] Figure 2 This is one of the structural schematic diagrams of the automatic adjustment device for the test bench torque difference provided in an embodiment of the present application;

[0015] Figure 3 This is a second structural diagram of the automatic adjustment device for the test bench torque difference provided in an embodiment of the present application;

[0016] Figure 4 This is the third structural diagram of the automatic adjustment device for the test bench torque difference provided in the embodiment of the present application;

[0017] Figure 5 This is the fourth structural diagram of the automatic adjustment device for the test bench torque difference provided in an embodiment of the present application;

[0018] Figure 6 An optional flow chart of a method for testing an electric drive assembly provided in an embodiment of the present application;

[0019] Figure 7 A schematic diagram of the preset range provided in an embodiment of the present application in a rectangular coordinate system;

[0020] Figure 8 A schematic diagram of a sudden change in the torque value of a servo motor provided in an embodiment of the present application;

[0021] Figure 9 A schematic diagram of a test bench torque difference automatic adjustment system provided in an embodiment of the present application;

[0022] Figure 10 A flow chart of a method for automatically adjusting the torque difference of a test bench provided in an embodiment of the present application;

[0023] Figure 11 A schematic structural diagram of a test device for an electric drive assembly provided in an embodiment of the present application;

[0024] Figure 12 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0025] Figure numbers: 1-mounting platform, 2-mounting base, 3-X-axis translation mechanism, 4-Y-axis translation mechanism, 5-slide rail, 6-screw fixing mechanism, 7-screw, 8-platform fixing mechanism, 9-bearing seat, 10-servo motor coupling, 11-servo motor. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0028] In order to solve the problem in the prior art that when the electric drive assembly is bench tested, the torque difference between the left and right half shafts is too large, which causes the test to be obstructed, the present application provides a test method for the electric drive assembly, such as Figure 1 As shown, the steps of the method include:

[0029] Step 101: Move the mobile platform mechanism to a center position, wherein the electric drive assembly is placed on the mobile platform mechanism; the center position is the center origin of a preset range, which is the origin of a rectangular coordinate system. The straight line on which the X-axis lies is parallel to the axial direction of a bench dynamometer used to test the electric drive assembly, and the Y-axis is perpendicular to the axial direction of the bench dynamometer. The boundary points of the preset range within the rectangular coordinate system are critical values ​​for testing the electric drive assembly.

[0030] In a specific example, Figure 2 The mobile platform shown includes a mounting platform 1 and a mounting base 2, where the electric drive assembly is placed on the mounting platform for bench testing. Specifically, holes can be drilled in the platform to secure the prototype (electric drive assembly) as needed. The mounting base serves as a cushion.

[0031] Further, Figure 2 Based on the mobile platform mechanism in Figure 3 As shown, the X-axis translation mechanism 3 in the mobile platform mechanism moves along the axial direction of the bench dynamometer on which the electric drive assembly is tested, and the Y-axis translation mechanism 4 in the mobile platform mechanism moves along the axial direction perpendicular to the bench dynamometer. Figure 4 and Figure 5 As shown, the slide rail 5 is used to enable the X-axis translation mechanism and the Y-axis translation mechanism to achieve translational motion. The screw fixing mechanism 6 is used to fix the screw. The screw 7 is used to convert the rotation of the servo motor into the translational motion of the platform. The platform fixing mechanism 8 is used to connect the mounting platform. The bearing seat 9 is used to fix the screw rotation bearing. The servo motor coupling 10 is used to connect the servo motor and the bearing seat to eliminate the negative effects of inaccurate installation alignment. The servo motor 11 is used to provide power for the translational motion.

[0032] Step 102 , moving the mobile platform mechanism within a preset range at a unit distance in a rectangular coordinate system, and determining the torque difference between the left and right half-axles of the current electric drive assembly each time the movement occurs;

[0033] In this regard, in a specific example of an embodiment of the present application, the mobile platform mechanism is generally not moved to a critical value within a preset range, but rather is moved within a certain range that is ensured to be away from the critical value, such as within a range of 50% to 80% of the critical value. For example, if the critical value is 10 cm, that is, if the mobile platform mechanism is moved within a range of less than 10 cm, the electric drive assembly is acceptable. However, when the mobile platform mechanism is moved to the critical value, the torque difference may be too large, which is not the desired torque difference result. Therefore, the mobile platform mechanism can be moved within a range of less than 8 cm. On the one hand, this ensures that the torque difference between the left and right half-axles of the electric drive assembly is not too large, causing damage to them, and on the other hand, it is also possible to more efficiently find a position that meets the expected torque difference within this range.

[0034] Step 103 : When the torque difference is less than a preset threshold, determine the current position of the mobile platform mechanism within the preset range as a test position of the electric drive assembly, and perform a bench test on the electric drive assembly at the test position.

[0035] Through the above steps 101 to 103, by moving the mobile platform mechanism on which the electric drive assembly is placed, the torque difference between the left and right half-axles of the current electric drive assembly is determined each time a unit distance is moved. If the current torque difference is not less than the preset threshold, the mobile platform mechanism is continued to be moved until a position corresponding to a torque difference less than the preset threshold is found, and the electric drive assembly is bench tested at this position. It can be seen that in the embodiment of the present application, the mobile platform mechanism can be moved so that the torque difference between the left and right half-axles of the electric drive assembly reaches the preset expectation, and then the electric drive assembly is bench tested, thereby ensuring the safety and accuracy of the bench test of the electric drive assembly, and solving the problem in the prior art that when the electric drive assembly is bench tested, the torque difference between the left and right half-axles is too large, resulting in obstruction of the test.

[0036] In the embodiment of the present application, the position of the mobile platform mechanism where the torque difference is the smallest is unknown in advance, and can be found by moving the mobile platform mechanism. However, in the specific example, it is difficult to move the mobile platform mechanism to the position corresponding to the smallest torque difference. Therefore, in the actual application scenario, as long as the torque difference at the current position of the mobile platform mechanism meets the expectations (that is, the torque difference at this time may not be the smallest, but it is within the required range). Furthermore, the movement of the mobile platform mechanism can be carried out in the following manner to find the position where the torque difference meets the expectations. Therefore, the method of moving the mobile platform mechanism within a preset range at a unit distance in a rectangular coordinate system involved in step 102 of the embodiment of the present application can further include:

[0037] Step 11: Starting from the center position, move the mobile platform mechanism in any direction of one of the X-axis and Y-axis by N times the unit distance, and then move clockwise to a position N times the unit distance away from the center position; wherein the value of N is an integer that increases from 1.

[0038] In this regard, in a specific example, the mobile platform mechanism can be moved to the center position (x0, y0), and the torque difference at the center position is determined. If the torque difference at this position is greater than a preset threshold, the mobile platform mechanism can be moved N times the unit distance in any direction of one of the X-axis and the Y-axis, for example, to a position (x0, y1) that is 1 times the unit distance of the square of the Y-axis. If the torque difference at this position is still greater than the preset threshold, the mobile platform is moved clockwise to the position (x1, y1), and the above method is executed in sequence until a position that meets the expected torque difference is found, and the current position is determined as the position for the electric drive assembly to be bench tested. It should be noted that the subscript numbers of the above x and y can represent multiples of the unit distance. For example, if the subscript is 1, it represents 1 times the unit distance, that is, x1 represents the position of the X-axis that is 1 times the unit distance from the origin. In addition, during the movement process, it is only necessary to find a position that meets the expected torque difference. Even if the torque difference at the next position is smaller, the bench test can be performed at the current position to improve the efficiency of the bench test.

[0039] In the embodiment of the present application, before moving the mobile platform mechanism, it is necessary to first determine the safe range (i.e., the preset range) within which the mobile platform mechanism can move when performing the current bench test. Therefore, before moving the mobile platform mechanism to the center position, Figure 6 As shown, the method of the embodiment of the present application may further include:

[0040] Step 601: Move the mobile platform mechanism along the Y-axis direction and the X-axis direction, and determine first target limit values ​​of the mobile platform mechanism in the Y-axis direction and the X-axis direction based on a sudden change of a servo motor on the mobile platform mechanism;

[0041] It should be noted that during the movement of the mobile platform mechanism, a sudden change in the servo motor's current can refer to a sudden change in the servo motor's torque. A sudden change indicates that the current test bench movement distance has reached its limit, and further movement could damage the electric drive assembly or the test bench. Furthermore, the first target limit includes limits in both the positive and negative directions of the X and Y axes.

[0042] Step 602 determines a target intermediate position of the mobile platform mechanism according to the first target limit value;

[0043] In a specific example, it can be moved along one axis in the rectangular coordinate system, such as moving in the X-axis direction, then the limit values ​​in the positive and negative directions of the X-axis can be determined, and then the midpoint in the X-axis direction can be determined, and then the midpoint in the X-axis direction can be used as the starting point to move in the Y-axis direction to determine the limit values ​​in the positive and negative directions of the Y-axis, and the midpoint between the two limit values ​​in the Y-axis direction is the origin position of the rectangular coordinate system. Similarly, if the two limit values ​​in the Y-axis direction are determined first, and then the two limit values ​​in the X-axis direction are determined based on the midpoint in the Y-axis direction, and the midpoint between the two limit values ​​in the X-axis direction is determined as the origin position of the rectangular coordinate system. Although they are two different methods, the origin position of the rectangular coordinate system ultimately determined by the two methods is consistent.

[0044] Based on this, the method involved in this step of determining the target middle position of the mobile platform mechanism based on the first target limit value can further be: determining the second middle position of the mobile platform mechanism on the X-axis based on the second limit value of the mobile platform mechanism in the positive and negative directions of the X-axis; wherein the second middle position is the target middle position.

[0045] Step 603: Using the target middle position as the origin of the rectangular coordinate system, determine the second target limit values ​​of the mobile platform mechanism along the X-axis and the Y-axis.

[0046] After determining the origin of the rectangular coordinate system, it is necessary to determine the limit values ​​of the X-axis direction and the Y-axis direction (second target limit values) based on the origin again. The limit values ​​of the X-axis direction and the Y-axis direction determined this time can be used as the basis for determining the preset range.

[0047] Step 604: Determine a preset range according to the second target limit value.

[0048] The method of determining the preset range based on the second target limit value involved in step 604 may further include: determining an arc between two adjacent second target limit values ​​on the X-axis and the Y-axis, and using the range determined based on the interconnected arcs as the preset range, wherein the coordinate values ​​of the X-axis coordinate point and the Y-axis coordinate point on the arc are inversely proportional.

[0049] In a specific example, the range of the preset range in the rectangular coordinate system is shown as follows Figure 7 As shown, since the values ​​on the X-axis and Y-axis corresponding to the position of the limit edge are in inverse proportion, the arc between the limit value point on the X-axis and the limit value point on the Y-axis is as follows Figure 7 Shown is curved.

[0050] In the embodiment of the present application, the method of moving the mobile platform mechanism along the Y-axis direction and the X-axis direction in the above step 501 and determining the first target limit values ​​of the mobile platform mechanism in the Y-axis direction and the X-axis direction according to the sudden change of the servo motor on the mobile platform mechanism may further include:

[0051] Step 21, moving the mobile platform mechanism along the positive and negative directions of the Y axis, and determining a first limit value of the mobile platform mechanism in the positive and negative directions of the Y axis based on a sudden change of a servo motor on the mobile platform mechanism;

[0052] Step 22: determining a first intermediate position of the mobile platform mechanism on the Y-axis based on the limit values ​​of the mobile platform mechanism in the positive and negative directions of the Y-axis;

[0053] In this regard, the first intermediate position is determined in the following manner: the midpoint position between the extreme values ​​in the positive direction is determined as the first intermediate position.

[0054] Step 23: Move the mobile platform mechanism at the first intermediate position along the positive and negative directions of the X-axis, and determine the second limit value of the mobile platform mechanism in the positive and negative directions of the X-axis based on the sudden change in the torque value of the servo motor on the mobile platform mechanism, wherein the first target limit value includes the first limit value and the second limit value.

[0055] In this regard, in the embodiment of the present application, the sudden change of the servo motor can be a sudden change in the torque value of the servo motor or a sudden change in the current of the servo motor. The position of the mobile platform mechanism at the moment of the sudden change is determined as the limit value, and the limit value can be determined in the same way in both the X-axis and Y-axis directions.

[0056] Based on this, the method involved in step 21 in the above embodiment of the present application for determining the first limit value of the mobile platform mechanism in the positive and negative directions of the Y-axis according to the sudden change in the torque value of the servo motor on the mobile platform mechanism may further include:

[0057] Step 31, controlling the servo motor to move the Y-axis of the mobile platform mechanism in the positive and negative directions, and monitoring the change in the torque value of the servo motor;

[0058] Step 32 : After the torque value changes from increasing to being stable, continue to control the mobile platform mechanism to move in the same direction, and determine the position of the mobile platform mechanism at the moment of the torque value sudden change as the first limit value.

[0059] In this regard, in a specific example, during the movement of the mobile platform mechanism, the sudden change of the servo motor thereof, for example, the change of the torque value of the servo motor, is shown as follows. Figure 8As shown, the torque value is stable between 20 and 80 degrees, indicating that the limit position of the mobile platform mechanism is approaching. After a period of stable torque value, a sudden change in torque value indicates that the current position is the limit value of the mobile platform mechanism in that direction. The limit values ​​are determined in the positive and negative directions of the X and Y axes in this way.

[0060] The present application is explained below in conjunction with a specific implementation of an embodiment of the present application, which provides a method for automatically adjusting the torque difference of a test bench. Figure 9 This is a schematic diagram of the bench test system in this specific embodiment, combined with Figure 9 In this specific embodiment, the steps of the automatic adjustment method of the test bench torque difference are as follows: Figure 10 Shown, including:

[0061] Step 1001: Start the test bench and ensure that the prototype is running stably under rated operating conditions (the operating conditions can be adjusted according to needs);

[0062] Step 1002: The test bench transmits the torque signals of the left and right dynamometers to the power supply and control module via signal cables (which may use CAN, LAN, or other protocols);

[0063] In step 1003, the power supply and control module calculates the torque difference based on the torque values ​​of the left and right dynamometers, and then controls the platform movement mechanism to adjust the position in the X and Y directions, with each position adjustment being one unit distance (the specific movement resolution can be set according to actual needs);

[0064] Step 1004: After the position adjustment is stabilized for a period of time, the torque difference is continued to be calculated. If it does not reach the expected value, the above step 1002 is repeated;

[0065] Step 1005: When the torque difference is adjusted to the target required value, the system stops adjusting and locks the position.

[0066] The control method of the platform moving mechanism in the above steps 1001 to 1005 may be as follows: first, after the prototype is assembled as required, the platform moving mechanism is started, and the platform moving mechanism automatically searches for the installation intermediate position. The steps of the searching method include:

[0067] Step 41, direction definition: X direction is parallel to the axial direction of the bench dynamometer, and Y direction is perpendicular to the axial direction of the dynamometer.

[0068] Step 42: Move slowly and evenly in the +Y direction to the limit position. The +Y limit position is determined by the sudden change of the torque value or current value of the servo motor, such as Figure 8As shown in the figure: the position corresponding to the circled part is taken as the extreme position in the +Y direction, represented by the letter a; similarly, the extreme position in the -Y direction can be obtained, represented by the letter b, and the position (a+b) / 2 is the middle position in the Y direction.

[0069] Step 43: The platform is in the middle position in the Y direction and moves in the +X direction and -X direction. Figure 8 The method is used to identify the extreme positions c and d, and the position of (c+d) / 2 is the middle position in the X direction.

[0070] Step 44 , the platform position is adjusted to (a+b) / 2, (c+d) / 2 and the middle position is automatically found.

[0071] Then, the mobile platform mechanism is in the middle position. Repeat the above steps to obtain the limit position e in the +Y direction and the limit position f in the +X direction. The range of the mobile platform mechanism can be obtained through data geometry operations, such as Figure 7 As shown. Furthermore, the power supply and control template converts the continuous part into a finite number of coordinate points according to the parameter settings (resolution settings). Finally, start the test bench and run the rated working conditions (which can be adjusted according to needs). Starting from the origin, rotate clockwise in the manner of (x0, y0), (x0, y1), (x1, y1), (x1, y0), (x1, y-1), (x0, y-1), (x-1, y-1), (x-1, y0), (x-1, y1). Each position is stable for more than 3 seconds and runs until the torque difference reaches the expected value. In addition, in order to avoid damage to the prototype caused by the extreme position, the movement range can be set to 50% to 80% of the extreme range.

[0072] It can be seen that in the embodiment of the present application, the torque difference is automatically adjusted through the mechanical structure, so that the prototype can be quickly adjusted to the optimal installation position, reducing the negative impact caused by the deviation of the prototype installation position, and improving the efficiency of the bench test while ensuring the safety of the bench test.

[0073] Corresponding to the above Figure 1 , the embodiment of the present application also provides a test device for an electric drive assembly, such as Figure 11 As shown, the device includes:

[0074] A first processing module 1102 is configured to move the mobile platform mechanism to a center position, wherein the electric drive assembly is placed on the mobile platform mechanism; the center position is the center origin of a preset range, the center origin of the preset range is the origin of a rectangular coordinate system, the straight line on which the X-axis lies is parallel to the axial direction of a bench dynamometer used to test the electric drive assembly, the Y-axis is perpendicular to the axial direction of the bench dynamometer, and the boundary points of the preset range within the rectangular coordinate system are critical values ​​for testing the electric drive assembly;

[0075] The second processing module 1104 is configured to move the mobile platform mechanism within a preset range at a unit distance in a rectangular coordinate system, and determine the torque difference between the left and right half-axles of the electric drive assembly each time the movement occurs;

[0076] The third processing module 1106 is used to determine that the current position of the mobile platform mechanism within the preset range is a test position of the electric drive assembly when the torque difference is less than a preset threshold, and perform a bench test on the electric drive assembly at the test position.

[0077] By using the device in the embodiment of the present application, the mobile platform mechanism on which the electric drive assembly is placed is moved. Each time a unit distance is moved, the torque difference between the left and right half-axles of the current electric drive assembly is determined. If the current torque difference is not less than a preset threshold, the mobile platform mechanism is continued to be moved until a position corresponding to a torque difference less than the preset threshold is found, and the electric drive assembly is bench tested at that position. It can be seen that in the embodiment of the present application, the mobile platform mechanism can be moved so that the torque difference between the left and right half-axles of the electric drive assembly reaches the preset expectation, and then the electric drive assembly is bench tested, thereby ensuring the safety and accuracy of the bench test of the electric drive assembly and solving the problem in the prior art that when the electric drive assembly is bench tested, the torque difference between the left and right half-axles is too large, resulting in obstruction of the test.

[0078] In an optional implementation manner of an embodiment of the present application, the second processing module in the embodiment of the present application may further include: a first processing unit, used to move the mobile platform mechanism in any direction of one of the X-axis and the Y-axis by N times the unit distance starting from the center position, and then move clockwise to a position N times the unit distance away from the center position; wherein the value of N is an integer that increases successively from 1.

[0079] In an optional implementation manner of the embodiment of the present application, the device in the embodiment of the present application may further include: a fourth processing module, used to move the mobile platform mechanism along the Y-axis direction and the X-axis direction before moving the mobile platform mechanism to the center position, and determine the first target limit value of the mobile platform mechanism in the Y-axis direction and the X-axis direction according to the sudden change of the servo motor on the mobile platform mechanism; a first determination module, used to determine the target middle position of the mobile platform mechanism according to the first target limit value; a fifth processing module, used to determine the second target limit value of the mobile platform mechanism moving along the X-axis and the Y-axis again with the target middle position as the origin position of the rectangular coordinate system; a second determination module, used to determine the preset range according to the second target limit value.

[0080] In an optional implementation manner of the embodiment of the present application, the fourth processing module in the embodiment of the present application may further include: a second processing unit, used to move the mobile platform mechanism along the positive and negative directions of the Y-axis, and determine the first limit value of the mobile platform mechanism in the positive and negative directions of the Y-axis according to the sudden change of the servo motor on the mobile platform mechanism; a first determination unit, used to determine the first intermediate position of the mobile platform mechanism on the Y-axis according to the limit value of the mobile platform mechanism in the positive and negative directions of the Y-axis; a third processing unit, used to move the mobile platform mechanism in the first intermediate position along the positive and negative directions of the X-axis, and determine the second limit value of the mobile platform mechanism in the positive and negative directions of the X-axis according to the sudden change of the servo motor on the mobile platform mechanism, wherein the first target limit value includes the first limit value and the second limit value.

[0081] In an optional implementation manner of an embodiment of the present application, the second processing unit in the embodiment of the present application may further include: a fourth processing unit, used to control the servo motor to move the Y-axis of the mobile platform mechanism in the positive and negative directions, and monitor the change of the torque value of the servo motor; a fifth processing unit, used to continue to control the mobile platform mechanism to move in the same direction after the change of the torque value increases to a stable state, and determine the position of the mobile platform mechanism at the moment of the torque value mutation as the first limit value.

[0082] In an optional implementation manner of the embodiment of the present application, the first determination module in the embodiment of the present application may further include: a second determination unit, used to determine the second intermediate position of the mobile platform mechanism on the X-axis based on the second limit value of the mobile platform mechanism in the positive and negative directions of the X-axis; wherein the second intermediate position is the target intermediate position.

[0083] In an optional implementation manner of an embodiment of the present application, the second determination module in the embodiment of the present application may further include: a third determination unit, used to determine the arc between two adjacent second target limit values ​​on the X-axis and the Y-axis, and the range determined based on the interconnected arcs is a preset range, wherein the coordinate points of the X-axis and the coordinate points of the Y-axis on the arc are in inverse proportion.

[0084] like Figure 12 As shown, the embodiment of the present application provides an air conditioner control device, including a processor 121, a communication interface 122, a memory 123 and a communication bus 124, wherein the processor 121, the communication interface 122, and the memory 123 communicate with each other through the communication bus 124.

[0085] Memory 123, for storing computer programs;

[0086] In one embodiment of the present application, the processor 121 is used to execute the program stored in the memory 123 to implement the test method of the electric drive assembly provided by any of the aforementioned method embodiments. The role it plays is similar and will not be repeated here.

[0087] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the electric drive assembly testing method provided in any of the aforementioned method embodiments are implemented.

[0088] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0089] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, or of course, by hardware. Based on this understanding, the above technical solution, in essence, or the part that contributes to the relevant technology, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiment.

[0090] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0091] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for testing an electric drive assembly, characterized in that: include: Move the mobile platform mechanism to a center position, wherein the electric drive assembly is placed on the mobile platform mechanism; the center position is the center origin of a preset range, and the center origin of the preset range is the origin of a rectangular coordinate system, the straight line on which the X-axis lies is parallel to the axial direction of a bench dynamometer used to test the electric drive assembly, and the Y-axis is perpendicular to the axial direction of the bench dynamometer, and the boundary points of the preset range within the rectangular coordinate system are critical values ​​for testing the electric drive assembly; Moving the mobile platform mechanism within the preset range at a unit distance in the rectangular coordinate system, and determining the torque difference between the left and right half-axles of the electric drive assembly each time the movement occurs; When the torque difference is less than a preset threshold, the current position of the mobile platform mechanism within the preset range is determined as the test position of the electric drive assembly, and the electric drive assembly is bench tested at the test position.

2. The method according to claim 1, characterized in that Moving the mobile platform mechanism within the preset range at a unit distance in the rectangular coordinate system includes: Starting from the center position, the mobile platform mechanism is moved N times the unit distance in any direction of one of the X-axis and the Y-axis, and then moved clockwise to a position N times the unit distance away from the center position; wherein the value of N is an integer that increases successively from 1.

3. The method according to claim 1, characterized in that Before moving the mobile platform mechanism to the center position, the method further includes: Move the mobile platform mechanism along the Y-axis direction and the X-axis direction, and determine first target limit values ​​of the mobile platform mechanism in the Y-axis direction and the X-axis direction according to a sudden change of a servo motor on the mobile platform mechanism; determining a target intermediate position of the mobile platform mechanism according to the first target limit value; Taking the target middle position as the origin of the rectangular coordinate system, determining again the second target limit value of the movement of the mobile platform mechanism along the X-axis and the Y-axis; The preset range is determined according to the second target limit value.

4. The method according to claim 3, characterized in that Moving the mobile platform mechanism along the Y-axis direction and the X-axis direction, and determining first target limit values ​​of the mobile platform mechanism in the Y-axis direction and the X-axis direction according to a sudden change of a servo motor on the mobile platform mechanism, comprising: Moving the mobile platform mechanism along the positive and negative directions of the Y axis, and determining first limit values ​​of the mobile platform mechanism in the positive and negative directions of the Y axis according to a sudden change of a servo motor on the mobile platform mechanism; determining a first intermediate position of the mobile platform mechanism on the Y-axis according to the limit values ​​of the mobile platform mechanism in the positive and negative directions of the Y-axis; The mobile platform mechanism is moved in the first intermediate position along the positive and negative directions of the X-axis, and the second limit value of the mobile platform mechanism in the positive and negative directions of the X-axis is determined according to the sudden change of the servo motor on the mobile platform mechanism, wherein the first target limit value includes the first limit value and the second limit value.

5. The method according to claim 4, characterized in that Determining a first limit value of the mobile platform mechanism in the positive and negative directions of the Y-axis according to a sudden change of a servo motor on the mobile platform mechanism includes: Controlling the servo motor to move the Y-axis of the mobile platform mechanism in the forward and reverse directions, and monitoring the change in the torque value of the servo motor; After the torque value changes from increasing to being stable, the mobile platform mechanism is continued to be controlled to move in the same direction, and the position of the mobile platform mechanism at the moment of the torque value sudden change is determined as the first limit value.

6. The method according to claim 3, characterized in that Determining a target intermediate position of the mobile platform mechanism according to the first target limit value includes: According to the second limit value of the mobile platform mechanism in the positive and negative directions of the X-axis, the second intermediate position of the mobile platform mechanism on the X-axis is determined; wherein the second intermediate position is the target intermediate position.

7. The method according to claim 3, characterized in that Determining the preset range according to the second target limit value includes: An arc between two adjacent second target limit values ​​on the X-axis and the Y-axis is determined, and a range determined based on connecting the arcs is used as the preset range, wherein the coordinate values ​​of the X-axis coordinate point and the Y-axis coordinate point on the arc are inversely proportional.

8. A test device for an electric drive assembly, characterized in that: include: A first processing module is configured to move a mobile platform mechanism to a center position, wherein the electric drive assembly is placed on the mobile platform mechanism; the center position is a center origin of a preset range, the center origin of the preset range is an origin of a rectangular coordinate system, the straight line on which the X-axis lies is parallel to the axial direction of a bench dynamometer used to test the electric drive assembly, the Y-axis is perpendicular to the axial direction of the bench dynamometer, and the boundary points of the preset range within the rectangular coordinate system are critical values ​​for testing the electric drive assembly; a second processing module, configured to move the mobile platform mechanism within the preset range at a unit distance in the rectangular coordinate system, and determine the torque difference between the left and right half-shafts of the electric drive assembly each time the movement occurs; The third processing module is used to determine that the current position of the mobile platform mechanism within the preset range is the test position of the electric drive assembly when the torque difference is less than a preset threshold, and to perform a bench test on the electric drive assembly at the test position.

9. An electronic device comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor coupled to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to execute the electric drive assembly testing method according to any one of claims 1 to 7. 10 . A computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the electric drive assembly testing method according to any one of claims 1 to 7.

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