Test method and device of electric drive assembly, electronic equipment and storage medium

Abstract

The invention relates to an electric drive assembly testing method and device, electronic equipment and a storage medium, and the method comprises the steps: moving a mobile platform mechanism to a central position, and placing an electric drive assembly on the mobile platform mechanism; the mobile platform mechanism is moved within a preset range according to the unit distance in the rectangular coordinate system, and the torque difference between the left half shaft and the right half shaft of the current electric drive assembly is determined every time the mobile platform mechanism is moved; and under the condition that the torque difference is smaller than a preset threshold value, the current position of the mobile platform mechanism in the preset range is determined as the test position of the electric drive assembly, and rack test is carried out on the electric drive assembly at the test position. According to the invention, the problem that the testing is blocked because the torque difference between the left half shaft and the right half shaft is too large when the bench test is carried out on the electric drive assembly in the prior art 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] At present, when the electric drive assembly of new energy vehicles is tested on the bench, the left and right half shafts provide torque. Therefore, when installing the test sample, the left and right half shafts of the dynamometer should be on the same horizontal line to avoid torque differences between the left and right half shafts. However, due to the layout of the whole vehicle, the lengths of the left and right half shafts are inconsistent. When the half shaft has a certain angle with the dynamometer, the torque of the left and right half shafts will deviate due to the inconsistent lengths of the left and right half shaft force arms.

[0003] During the test, if the torque difference is too large, one half shaft will bear a large load for a long time, which may lead to premature failure. In this regard, the bench dynamometer can adjust the torque difference by adjusting the speed of the left and right dynamometers, but due to the limited response speed of the speed control, in the actual adjustment process, the torque of the left and right half shafts is prone to rise alternately, making the adjustment more difficult during dynamic working condition testing. If the adjustment force is too large, the prototype will be in an obvious differential state, which is not conducive to the development of the test. Summary of the invention

[0004] The present application provides a test 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, there is an excessively large torque difference between the left and right half shafts, which causes test obstruction.

[0005] In a 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 in 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 shafts of the current electric drive assembly each time the movement is performed; when the torque difference is less than a preset threshold, determining that the current position of the mobile platform mechanism within the preset range is 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, used 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 point of the preset range in the rectangular coordinate system is a critical value for testing the electric drive assembly; a second processing module, used 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 current electric drive assembly each time it moves; a third processing module, used to determine, when the torque difference is less than a preset threshold, that the current position of the mobile platform mechanism within the preset range is the test position of the electric drive assembly, and to 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 electric drive assembly testing method 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 compared with 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 axles of the current electric drive assembly is determined for each unit distance moved, and if the current torque difference is not less than the preset threshold, the mobile platform mechanism is continued to be moved until the position corresponding to the 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 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 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0013] Figure 1 A flow chart 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 the embodiment of the present application;

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

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

[0017] Figure 5 The fourth structural schematic diagram of the automatic adjustment device for the test bench torque difference provided in the 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 range of the preset range provided in the 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] Fig. 9 A schematic diagram of a test bench torque difference automatic adjustment system provided in an embodiment of the present application;

[0022] Fig.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] Fig.11 A schematic diagram of the structure of a test device for an electric drive assembly provided in an embodiment of the present application;

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

[0025] Figure numbers: 1-installation platform, 2-installation 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] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0028] In order to solve the problem in the prior art that when the electric drive assembly is tested on a bench, 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, moving the mobile platform mechanism to the center position, wherein the electric drive assembly is placed on the mobile platform mechanism; the center position is the center origin of the preset range, the center origin of the preset range is the origin of the rectangular coordinate system, the straight line where the X-axis is located is parallel to the axial direction of the 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 point of the preset range in the rectangular coordinate system is the critical value 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, wherein the electric drive assembly is placed on the mounting platform for bench testing. Specifically, holes can be drilled on the flat plate according to actual needs to fix the prototype (electric drive assembly). The mounting base is used to play a role of padding.

[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 installation 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 impact caused by 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 half shaft and the right half shaft of the current electric drive assembly each time the movement is performed;

[0033] In this regard, in a specific example of an embodiment of the present application, the mobile platform mechanism is usually not moved to the critical value of the preset range, but is moved within a certain range to ensure that it is far away from the critical value, such as moving within a range of 50% to 80% of the critical value. For example, if the critical value is 10 cm, that is, moving within a range of less than 10 cm, the electric drive assembly is acceptable, but when the mobile platform mechanism is moved to the critical value, its 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, which, on the one hand, ensures that the torque difference between the left and right half shafts of the electric drive assembly will not be too large to cause damage to it, and on the other hand, it can also be more efficient to 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 that the current position of the mobile platform mechanism within the preset range is 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 axles of the current electric drive assembly is determined once each time a unit distance is moved. If the current torque difference is not less than the preset threshold, the mobile platform mechanism continues 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 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 axles is too large, resulting in obstruction of the test.

[0036] In the embodiment of the present application, it is unknown in advance at which position of the mobile platform mechanism has the smallest torque difference, and it 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). Further, 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 the Y-axis by N times the unit distance, and then move clockwise to a position N times the unit distance 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 may be moved to the center position (x0, y0), and the torque difference at the center position may be determined. If the torque difference at this position is greater than a preset threshold, the mobile platform mechanism may be moved to any direction of one of the X-axis and the Y-axis by N times the unit distance, 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 bench testing of the electric drive assembly. It should be noted that the subscript numbers of the above x and y may 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 the mobile platform mechanism is moved, 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 the mobile platform mechanism is moved to the center position, Figure 6 As shown, the method of the embodiment of the present application may also include:

[0040] Step 601, moving the mobile platform mechanism along the Y-axis direction and the X-axis direction, and determining 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;

[0041] It should be noted that during the movement of the mobile platform mechanism, the sudden change of the servo motor on the mechanism can refer to the sudden change of current or the sudden change of torque of the servo motor. The sudden change indicates that the moving distance of the current bench test has reached the limit value, and if it continues to move, it may cause damage to the electric drive assembly or the bench. In addition, the first target limit value includes the limit values ​​in the positive and negative directions of the X-axis and the Y-axis.

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

[0043] In a specific example, it can be moved along one of the axes 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 is used as the starting point, and the limit values ​​in the positive and negative directions of the Y-axis are determined by moving in the Y-axis direction, 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 finally 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 according to the first target limit value can further be: determining the second middle position of the mobile platform mechanism on the X-axis according to 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, taking the target middle position as the origin position of the rectangular coordinate system, again determining the second target limit value of the movement 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 according to 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 points of the X-axis and the coordinate points of the Y-axis on the arc are in inverse proportion.

[0049] In the specific example, the range of the preset range in the rectangular coordinate system is shown as follows Figure 7 As shown in , 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 involved in the above step 501, and determining 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, may further include:

[0051] Step 21, moving the mobile platform mechanism along the positive and negative directions of the Y axis, and 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 of the servo motor on the mobile platform mechanism;

[0052] Step 22, 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;

[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 according to the sudden change of 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, the sudden change of the servo motor in the embodiment of the present application 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 of 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 of the torque value of the servo motor on the mobile platform mechanism involved in step 21 in the above embodiment of the present application 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 of 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 mutation as the first limit value.

[0059] In this regard, in a specific example, during the movement of the mobile platform mechanism, the servo motor of the mobile platform mechanism undergoes a sudden change, for example, a change in the torque value of the servo motor. Figure 8As shown in the figure, the torque value is stable when the motor is between 20 and 80 degrees, indicating that it is close to the limit position of the mobile platform mechanism. After the torque value is stable for a period of time, a sudden change in the torque value indicates that the current position is the limit value of the mobile platform mechanism in this direction. The limit values ​​are determined in this way in both the positive and negative directions of the X-axis and the Y-axis.

[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. Fig. 9 is a system schematic diagram of the bench test in this specific implementation mode, combined with Fig. 9 The steps of the automatic adjustment method of the test bench torque difference in this specific implementation method are as follows: Fig.10 As shown, including:

[0061] Step 1001, start the test bench, and the prototype is in stable operation under rated working conditions (the working 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 through signal cables (CAN, LAN and other protocols may be used);

[0063] Step 1003, the power supply and control module calculates the torque difference according to the torque values ​​of the left and right dynamometers, and then controls the platform moving mechanism to adjust the position in the X and Y directions, with each position adjustment being a 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: first, after the prototype is assembled as required, the platform moving mechanism is started, and the platform moving mechanism will automatically search for the installation middle 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 at a uniform speed 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: 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, then 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 is translated 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, and the above steps are repeated 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 calculation, such as Figure 7 As shown. Further, the power supply and control template converts the continuous part into a finite number of coordinate points according to the parameter setting (resolution setting). Finally, start the test bench and run the rated working condition (adjustable according to demand), starting from the origin, and 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 3s 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 50-80% 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. While ensuring the safety of the bench test, the efficiency of the bench test is also improved.

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

[0074] The first processing module 1102 is used 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 the preset range, the center origin of the preset range is the origin of the rectangular coordinate system, the straight line where the X-axis is parallel to the axial direction of the 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 point of the preset range in the rectangular coordinate system is the critical value for testing the electric drive assembly;

[0075] The second processing module 1104 is used 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 half shaft and the right half shaft of the current electric drive assembly each time the movement is performed;

[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] Through the device in the embodiment of the present application, the mobile platform mechanism on which the electric drive assembly is placed is moved, and each time a unit distance is moved, the torque difference between the left and right axles of the current electric drive assembly is determined. If the current torque difference is not less than the preset threshold, the mobile platform mechanism continues to be moved until the position corresponding to the 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 to make the torque difference between the left and right axles of the electric drive assembly reach the preset expectation, and then the electric drive assembly is bench tested, which ensures the safety and accuracy of the bench test of the electric drive assembly, and solves the problem in the prior art that when the electric drive assembly is bench tested, the torque difference between the left and right 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 also 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 mobile platform mechanism in the positive and negative directions of the Y-axis, 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 torque value changes from increasing to stable, 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 Fig.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, used 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, and its role 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, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0089] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for 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 some parts of the embodiments.

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

[0091] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but rather to 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 the center position, wherein the electric drive assembly is placed on the mobile platform mechanism; the center position is the center origin of the preset range, the center origin of the preset range is the origin of the rectangular coordinate system, the straight line where the X-axis is parallel to the axial direction of the 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 point of the preset range in the rectangular coordinate system is the critical value 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 half shaft and the right half shaft 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 a test position of the electric drive assembly, and a bench test is performed on the electric drive assembly 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 from the center position; wherein the value of N is an integer that increases from 1.

3. The method according to claim 1, characterized in that Before moving the mobile platform mechanism to the central position, the method further comprises: Move the mobile platform mechanism along the Y-axis direction and the X-axis direction, 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; 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 position 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 The mobile platform mechanism is moved along the Y-axis direction and the X-axis direction, and a first target limit value of the mobile platform mechanism in the Y-axis direction and the X-axis direction is determined according to a sudden change of a servo motor on the mobile platform mechanism, including: 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; 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 positive and negative directions, and monitoring changes in the torque value of the servo motor; After the torque value changes from increasing to being stable, the mobile platform mechanism is continuously controlled to move in the same direction, and the position of the mobile platform mechanism at the moment of the torque value mutation 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 middle position of the mobile platform mechanism on the X-axis is determined; wherein the second middle position is the target middle 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 the 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.

8. A test device for an electric drive assembly, characterized in that: include: A first processing module is used 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 where the X-axis is located is parallel to the axial direction of a bench dynamometer for testing the electric drive assembly, the Y-axis is perpendicular to the axial direction of the bench dynamometer, and the boundary point of the preset range in the rectangular coordinate system is a critical value for testing the electric drive assembly; A second processing module is used 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 half shaft and the right half shaft of the electric drive assembly each time the movement is performed; 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 value, 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 test method of the electric drive assembly 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 test method of the electric drive assembly according to any one of claims 1 to 7.

Images