A method and apparatus for testing the force profile of a wiper system

Abstract

The application discloses a kind of excitation force characteristic test method and device for wiper system, it is related to vehicle technical field, the method comprises: wiper system is divided into three regions, according to the parameter information calculation of three regions, the real excitation force of wiper system is calculated, independent of the boundary condition of damper region and vehicle body region;Build wiper motor test bench, calibrate reference point and target point on wiper motor test bench, arrange acceleration sensor;Get the connection point of wiper motor test bench and wiper motor, select at least one degree of freedom direction hammering, obtain transfer function;Start wiper motor, obtain vibration response data by acceleration sensor;Based on the vibration response data of reference point and transfer function, obtain the real excitation force of wiper motor, the present application can solve the technical problems that the development cycle is long and the cost is high in the prior art in the physical sample car stage matching different vehicle body for wiper system test.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a method and device for testing excitation force characteristics of a wiper system. BACKGROUND

[0002] The wiper is one of the indispensable parts of the automobile, which functions to wipe off the raindrops and dust attached to the windshield of the vehicle, improve the visibility of the driver, and keep the windshield clear. However, the wiper motor generates corresponding vibration impact load when it works, and these vibration loads are transmitted to the vehicle body through the mounting point between the wiper motor and the wiper, resulting in noise, distracting the driver and affecting the driving safety.

[0003] At present, the NVH index of the wiper system is analyzed during the physical sample vehicle stage to reduce the noise of the wiper system. However, the physical sample vehicle needs to be matched with different vehicle bodies to test the vibration noise performance of the wiper system, which has a long development cycle, wastes manpower and time cost, and has a high cost for improving the matching of different vehicle bodies. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application aims to provide a method and device for testing excitation force characteristics of a wiper system, which aims to solve the technical problems of long development cycle and high cost in the prior art of matching different vehicle bodies to test the wiper system during the physical sample vehicle stage.

[0005] In one aspect, the present application provides a method for testing excitation force characteristics of a wiper system, which comprises:

[0006] The wiper system is divided into three regions, namely the excitation source region, the shock absorber region and the vehicle body region. According to the parameter information of the three regions, the predicted acceleration response data is derived, the real excitation force is replaced by the predicted acceleration response data, and the boundary conditions of the real excitation force of the wiper system independent of the shock absorber region and the vehicle body region are calculated;

[0007] A wiper motor test bench is built, and a reference point and a target point are calibrated on the wiper motor test bench. Acceleration sensors are arranged at the reference point and the target point, respectively;

[0008] The connection points of the wiper motor test bench and the wiper motor are obtained, at least one degree of freedom direction is selected at the connection points, and the transfer functions of the reference point and the target point are obtained;

[0009] The wiper motor is started, and the vibration response data of the reference point and the target point are obtained by the acceleration sensors;

[0010] Based on the vibration response data and transfer function of the reference point, the actual excitation force of the wiper motor is calculated.

[0011] Based on the vibration response data and transfer function of the target point, the accuracy of the actual excitation force of the wiper motor is verified.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The excitation force characteristic testing method for wiper systems provided by the present invention derives the calculation of the true excitation force of the wiper system through region division calculation, which is independent of the boundary conditions of the shock absorber region and the vehicle body region. Therefore, different vehicle bodies can be matched to verify their vibration and noise levels at the digital prototype stage without entering the physical prototype stage. Furthermore, by designing a wiper motor test bench, measuring the vibration response data and transfer function of the reference point, the true excitation force of the wiper motor can be calculated. The method is simple and low-cost. Finally, by measuring the vibration response data and transfer function of the target point, the accuracy of the true excitation force of the wiper motor is verified, improving the accuracy of the true excitation force calculation. This solves the technical problem in the prior art of matching different vehicle bodies for wiper system testing at the physical prototype stage, which results in a long development cycle and high cost.

[0013] According to one aspect of the above technical solution, the step of calculating the actual excitation force of the wiper motor based on the vibration response data and transfer function of the reference point specifically includes:

[0014] F BLOCKED =[H c ] -1 a c ,

[0015] Among them, F BLOCKED For the actual excitation force of the wiper motor, [H c [a] is the transfer function for the reference point. c Vibration response data for reference point.

[0016] According to one aspect of the above technical solution, the wiper motor test bench includes a base and a frame disposed on the base. The frame includes vertical plates at both ends and a connecting plate connecting the two vertical plates. The wiper motor includes a wiper motor body and a connecting rod assembly connected to the wiper motor body. The connecting rod assembly connects the two vertical plates to form the connection point.

[0017] According to one aspect of the above technical solution, the reference point is arranged on the vertical plate, and the target point is arranged on the connecting plate.

[0018] According to one aspect of the above technical solution, the wiper system is divided into three regions: the excitation source region, the shock absorber region, and the vehicle body region. Based on the parameter information of these three regions, predicted acceleration response data is calculated and derived. The predicted acceleration response data is then replaced with an equivalent actual excitation force to obtain the step of calculating the actual excitation force of the wiper system independently of the boundary conditions of the shock absorber region and the vehicle body region. Specifically, this includes:

[0019] The wiper system is divided into three areas: the excitation source area, the shock absorber area, and the vehicle body area.

[0020] The excitation source of the excitation source region, the connection point between the excitation source region and the shock absorber region, the connection point between the shock absorber region and the vehicle body region, and the measurement point of the required test excitation force characteristics of the vehicle body region are respectively the first point, the second point, the third point, and the fourth point.

[0021] Based on the parameter information of the excitation source region, calculation formula one is derived; based on the parameter information of the shock absorber region, calculation formula two is derived; and based on the parameter information of the vehicle body region, calculation formula three is derived.

[0022] Calculate the predicted acceleration response data at the fourth point based on calculation formulas one, two, and three.

[0023] The excitation source is replaced with an equivalent real excitation force to obtain equivalent predicted acceleration response data.

[0024] Based on the equivalent predicted acceleration response data and the actual measured acceleration response data, the calculation shows that the true excitation force of the wiper system is independent of the boundary conditions of the shock absorber region and the vehicle body region.

[0025] According to one aspect of the above technical solution, based on the parameter information of the excitation source region, calculation formula one is derived; based on the parameter information of the shock absorber region, calculation formula two is derived; and based on the parameter information of the vehicle body region, calculation formula three is derived. The specific steps include:

[0026] Based on the transfer function from the first point to the second point, the self-interface transfer function of the second point, the load generated at the first point, and the force generated by the suspension at the second point, calculation formula one is derived as follows:

[0027]

[0028] in, For the active side acceleration response data of the suspension at the second point, [H] 21 [H] is the transfer function from the first point to the second point. 22] is the function passed to the interface of the second point, F s For the load generated at the first point, F m This is the force generated when the device is suspended at the second point;

[0029] Based on the suspension stiffness and frequency at point two, the active side acceleration response data of the suspension at point two, and the passive side acceleration response data of the suspension at point three, calculation formula two is derived, as follows:

[0030]

[0031] Among them, F m Let K be the force generated by the suspension at the second point, K be the suspension stiffness at the second point, and ω be the suspension frequency at the second point. The data represents the passive side acceleration response of the suspension at the third point.

[0032] Based on the self-interface transfer function of point three, calculation formula three is derived, and the calculation formula is as follows:

[0033]

[0034] Among them, [H 33 ] is the function passed to the interface of the third point.

[0035] According to one aspect of the above technical solution, the steps for calculating the predicted acceleration response data at the fourth point, based on calculation formulas one, two, and three, specifically include:

[0036] Based on calculation formulas one and three, the response difference is obtained, and the calculation formula is as follows:

[0037]

[0038] Input the response difference into calculation formula two to obtain the actual force generated by the suspension at the second point. The calculation formula is as follows:

[0039]

[0040] Based on the force generated by the suspension at the actual second point, the predicted acceleration response data at the fourth point is calculated using the following formula:

[0041]

[0042] Among them, a pre. For the predicted acceleration response data at the fourth point, [H] 43 ] is the transfer function from the third point to the fourth point.

[0043] According to one aspect of the above technical solution, the step of replacing the excitation source with an equivalent real excitation force to obtain equivalent predicted acceleration response data specifically includes:

[0044] The excitation source is replaced with an equivalent real excitation force, and the acceleration response data of the suspension active side at the second point after the equivalent is calculated. The calculation formula is as follows:

[0045]

[0046] Based on Formulas 2 and 3, and the equivalent acceleration response data of the active side of the suspension at the second point, the force generated by the suspension at the equivalent second point is derived, and the calculation formula is as follows:

[0047] F′ m =-[ω 2 K -1 +([H 22 ]+[H 33 ])] -1 [H 22 ]F 2；BLOCKED ,

[0048] Based on the force generated by the suspension at the equivalent second point, the equivalent predicted acceleration response data is calculated using the following formula:

[0049] a′ pre. =[H 43 ][ω 2 K -1 +([H 22 ]+[H 33 ])] -1 [H 22 ]F 2；BLOCKED ,

[0050] Where, a′ pre. For the equivalent predicted acceleration response data, F 2；BLOCKED For the real motivation on the second point, For the equivalent active-side acceleration response data of the suspension at the second point, F m ′ represents the force generated by the suspension at the second point after the equivalent calculation.

[0051] According to one aspect of the above technical solution, the step of calculating the true excitation force of the wiper system, independent of the boundary conditions of the shock absorber region and the vehicle body region, based on the equivalent predicted acceleration response data and the actual measured acceleration response data, specifically includes:

[0052] By comparing the equivalent predicted acceleration response data with the actual measured acceleration response data, it was found that the equivalent predicted acceleration response data and the actual measured acceleration response data are the same. Therefore, the calculation formula for the equivalent predicted acceleration response data is equal to the calculation formula for the actual predicted acceleration response data. Thus, the actual excitation force of the wiper system is calculated to be independent of the boundary conditions of the shock absorber region and the vehicle body region. The calculation formula is as follows:

[0053] a pre. =a′ pre.

[0054] [H 43 ][ω 2 K -1 +([H 22 ]+[H 33 ])] -1 [H 21 ]F s =[H 43 ][ω 2 K -1 +([H 22 ]+[H 33 ])] -1 [H 22 ]F 2；BLOCKED .

[0055] F 2；BLOCKED =[H 21 ]F s [H 22 ] -1

[0056] Another aspect of the present invention provides a testing device for the excitation force characteristics of a wiper system. This device is used to implement the aforementioned testing method for the excitation force characteristics of a wiper system. The device includes:

[0057] The formula derivation module is used to divide the wiper system into three regions: the excitation source region, the shock absorber region, and the vehicle body region. Based on the parameter information of the three regions, the predicted acceleration response data is calculated and derived. The predicted acceleration response data is then replaced with the actual excitation force. The actual excitation force of the wiper system is calculated to be independent of the boundary conditions of the shock absorber region and the vehicle body region.

[0058] The calibration point module is used to build a wiper motor test bench, calibrate reference points and target points on the wiper motor test bench, and arrange acceleration sensors on the reference points and target points respectively.

[0059] The transfer function acquisition module is used to acquire the connection point between the wiper motor test bench and the wiper motor, select at least one degree of freedom direction to hammer at the connection point, and acquire the transfer function of the reference point and the target point.

[0060] The response data acquisition module is used to start the wiper motor and acquire vibration response data of the reference point and the target point through the accelerometer.

[0061] The excitation force calculation module is used to calculate the actual excitation force of the wiper motor based on the vibration response data and transfer function of the reference point;

[0062] The excitation force verification module is used to verify the accuracy of the actual excitation force of the wiper motor based on the vibration response data and transfer function of the target point. Attached Figure Description

[0063] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0064] Figure 1 This is a flowchart illustrating the excitation force characteristic testing method for a windshield wiper system according to Embodiment 1 of the present invention.

[0065] Figure 2 This is a schematic diagram of the structure of the three regions of the wiper system in Embodiment 1 of the present invention;

[0066] Figure 3 This is a schematic diagram of the structure of the three regions after the equivalent replacement of the wiper system in Embodiment 1 of the present invention;

[0067] Figure 4 This is a schematic diagram of the structure of the wiper motor test bench in Embodiment 1 of the present invention;

[0068] Figure 5 This is a structural block diagram of the excitation force characteristic testing device for a windshield wiper system in Embodiment 2 of the present invention;

[0069] Component symbol explanation in the attached diagram:

[0070] Point 1, Point 2, Point 3, Point 4, Wiper Motor, Reference Point, Connection Point, Target Point, Formula Derivation Module, Calibration Point Module, Transfer Function Acquisition Module, Response Data Acquisition Module, Excitation Force Calculation Module, Excitation Force Verification Module.

[0071] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0072] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be more thorough and complete.

[0073] Example 1

[0074] Please see Figures 1-4 The first embodiment of the present invention provides a method for testing the excitation force characteristics of a windshield wiper system, the method comprising steps S10-S15:

[0075] Step S10: Divide the wiper system into three regions: excitation source region, shock absorber region, and vehicle body region. Calculate and derive predicted acceleration response data based on the parameter information of the three regions. Replace the predicted acceleration response data with the actual excitation force. Calculate the actual excitation force of the wiper system, which is independent of the boundary conditions of the shock absorber region and the vehicle body region.

[0076] like Figure 2 As shown, in the wiper system, the excitation source area is connected to the vehicle body area through the shock absorber area, which is the wiper motor and related components.

[0077] Specifically, the wiper system is divided into three regions: the excitation source region, the shock absorber region, and the vehicle body region. Predicted acceleration response data is calculated and derived based on the parameter information of these three regions. The predicted acceleration response data is then replaced with an equivalent actual excitation force to obtain the actual excitation force of the wiper system, which is calculated independently of the boundary conditions of the shock absorber region and the vehicle body region. This process includes the following steps:

[0078] The wiper system is divided into three areas: the excitation source area, the shock absorber area, and the vehicle body area.

[0079] The excitation source of the excitation source region, the connection point between the excitation source region and the shock absorber region, the connection point between the interface between the shock absorber region and the vehicle body region, and the measurement points for the required test excitation force characteristics of the vehicle body region are respectively point 1, point 2, point 3, and point 4.

[0080] Based on the parameter information of the excitation source region, calculation formula one is derived; based on the parameter information of the shock absorber region, calculation formula two is derived; and based on the parameter information of the vehicle body region, calculation formula three is derived.

[0081] Specifically, based on the transfer function from point 1 to point 2, the self-interface transfer function of point 2, the load generated by point 1, and the force generated by the suspension at point 2, calculation formula one is derived as follows:

[0082]

[0083] in, For the active side acceleration response data of the suspension at point 2, [H] 21 [H] is the transfer function from point 1 to point 2. 22 ] is the function passed to the interface of point 2 itself, F s For the load generated at point 1, F m This is the force generated by the suspension at point 2.

[0084] Based on the suspension stiffness, suspension frequency, and active side acceleration response data of the suspension at point 2, and the passive side acceleration response data of the suspension at point 3, calculation formula two is derived as follows:

[0085]

[0086] Among them, F m Let K be the force generated by the suspension at point 2, K be the suspension stiffness at point 2, and ω be the suspension frequency at point 2. This refers to the passive side acceleration response data of the suspension at point 3.

[0087] Based on the interface transfer function of point 3, calculation formula 3 is derived as follows:

[0088]

[0089] Among them, [H 33 ] is the function passed to the interface of point 3 itself.

[0090] Calculate the predicted acceleration response data at point 4 based on calculation formulas 1, 2, and 3.

[0091] Specifically, based on calculation formula one and calculation formula three, the response difference is obtained, and the calculation formula is as follows:

[0092]

[0093] Inputting the response difference into calculation formula two yields the actual force generated by the suspension at the second point 2, calculated as follows:

[0094]

[0095] Based on the force generated by the suspension at the actual second point 2, the predicted acceleration response data at the fourth point 4 is calculated using the following formula:

[0096]

[0097] Among them, a pre. For the predicted acceleration response data at point 4, [H] 43 ] is the transfer function from point 3 to point 4.

[0098] like Figure 3 As shown, the excitation source is replaced with an equivalent real excitation force to obtain equivalent predicted acceleration response data;

[0099] Specifically, the excitation source is replaced with an equivalent real excitation force, and the equivalent active-side acceleration response data at the second point is calculated using the following formula:

[0100]

[0101] Based on Formulas 2 and 3, and the equivalent acceleration response data of the active side of the suspension at the second point, the force generated by the suspension at the equivalent second point is derived, and the calculation formula is as follows:

[0102] F′ m =-[ω 2 K -1 +([H 22 ]+[H 33 ])] -1 [H 22 ]F 2；BLOCKED ,

[0103] Based on the force generated by the suspension at the equivalent second point, the equivalent predicted acceleration response data is calculated using the following formula:

[0104] a′ pre. =[H 43 ][ω 2 K -1 +([H 22 ]+[H 33 ])] -1 [H 22 ]F 2；BLOCKED ,

[0105] Where, a′ pre. For the equivalent predicted acceleration response data, F 2；BLOCKED For the real motivation on the second point, For the equivalent active-side acceleration response data at the second point, F′ mThis refers to the force generated by the suspension at the second point after the equivalent calculation.

[0106] Based on the equivalent predicted acceleration response data and the actual measured acceleration response data, the calculation shows that the true excitation force of the wiper system is independent of the boundary conditions of the shock absorber region and the vehicle body region.

[0107] Specifically, the equivalent predicted acceleration response data is compared with the actual measured acceleration response data. The results show that the equivalent predicted acceleration response data and the actual measured acceleration response data are identical. Therefore, the calculation formula for the equivalent predicted acceleration response data is equal to the calculation formula for the actual predicted acceleration response data. Thus, the actual excitation force of the wiper system is calculated to be independent of the boundary conditions of the shock absorber region and the vehicle body region. The calculation formula is as follows:

[0108] a pre. =a′ pre.

[0109] [H 43 ][ω 2 K -1 +([H 22 ]+[H 33 ])] -1 [H 21 ]F s =[H 43 ][ω 2 K -1 +([H 22 ]+[H 33 ])] -1 [H 22 ]F 2；BLOCKED .

[0110] F 2；BLOCKED =[H 21 ]F s [H 22 ] -1

[0111] Therefore, the true excitation force characteristics are only related to the excitation source itself and its own origin transfer function and the transfer function from point 1 to point 2. They are independent of the boundary conditions of the shock absorber region and the vehicle body region. In the digital prototype stage, different vehicle bodies can be matched to verify their vibration and noise levels.

[0112] But due to F s The calculation and measurement of the force are difficult, so it is necessary to design a wiper motor test bench to measure the actual excitation force of the wiper motor.

[0113] Step S11: Construct a wiper motor test bench, mark reference points and target points on the wiper motor test bench, and place acceleration sensors on the reference points and target points respectively.

[0114] like Figure 4 As shown, the wiper motor test bench includes a base and a frame mounted on the base. The frame includes vertical plates at both ends and a connecting plate connecting the two vertical plates. The wiper motor 5 includes a wiper motor body and a connecting rod assembly connecting the wiper motor. The connecting rod assembly connects the two vertical plates respectively to obtain the connection point 7 between the wiper motor test bench and the wiper motor. The reference point 6 is arranged on the vertical plate, and the target point 8 is arranged on the connecting plate.

[0115] Step S12: Obtain the connection point between the wiper motor test bench and the wiper motor, select at least one degree of freedom direction at the connection point and hammer it, and obtain the transfer function of the reference point and the target point;

[0116] Example, not limitation, involves hammering in three degrees of freedom directions: X, Y, and Z.

[0117] Step S13: Start the wiper motor and acquire vibration response data of the reference point and the target point through the accelerometer;

[0118] For example, rather than limiting, the wiper motor is connected to an external 12V regulated power supply, which enables the wiper motor to run smoothly on the test bench. At this time, the vibration time-domain data of the reference point and the target point are acquired. After the FFT (Fast Fourier Transform) is used, the test data is transformed from a time-domain signal into a frequency-domain signal spectrum curve, and the vibration response data of the reference point and the target point are acquired.

[0119] Step S14: Calculate the actual excitation force of the wiper motor based on the vibration response data and transfer function of the reference point;

[0120] F BLOCKED =[H c ] -1 a c ,

[0121] Among them, F BLOCKED For the actual excitation force of the wiper motor, [H c [a] is the transfer function for the reference point. c Vibration response data for reference point.

[0122] Step S15: Based on the vibration response data and transfer function of the target point, verify the accuracy of the actual excitation force of the wiper motor.

[0123] Specifically, based on the actual excitation force of the wiper motor and the transfer function of the target point, the predicted response data of the target point is obtained, and the calculation formula is as follows:

[0124]

[0125] in, For the predicted response data of the target point, [H m Let F be the transfer function of the target point. BLOCKED This is the actual excitation force of the wiper motor.

[0126] The accuracy of the actual excitation force of the wiper motor is verified by comparing the predicted response data with the measured response data at the target point.

[0127] Compared with existing technologies, the excitation force characteristic testing method for wiper systems shown in this embodiment derives the true excitation force of the wiper system through region division calculation, which is independent of the boundary conditions of the shock absorber region and the vehicle body region. Therefore, different vehicle bodies can be matched to verify their vibration and noise levels at the digital prototype stage, without needing to enter the physical prototype stage. By designing a wiper motor test bench, measuring the vibration response data and transfer function of the reference point, the true excitation force of the wiper motor can be calculated. The method is simple and low-cost. Finally, by measuring the vibration response data and transfer function of the target point, the accuracy of the true excitation force of the wiper motor is verified, improving the accuracy of the true excitation force calculation. This solves the technical problem in existing technologies that require matching different vehicle bodies for wiper system testing at the physical prototype stage, resulting in long development cycles and high costs.

[0128] Example 2

[0129] Please see Figure 5 The image shows a second embodiment of the present invention, which provides a device for testing the excitation force characteristics of a windshield wiper system. The device includes:

[0130] The formula derivation module 100 is used to divide the wiper system into three regions: the excitation source region, the shock absorber region, and the vehicle body region. Based on the parameter information of the three regions, the predicted acceleration response data is calculated and derived. The predicted acceleration response data is then replaced with the actual excitation force. The actual excitation force of the wiper system is calculated to be independent of the boundary conditions of the shock absorber region and the vehicle body region.

[0131] The calibration point module 200 is used to build a wiper motor test bench, calibrate reference points and target points on the wiper motor test bench, and arrange acceleration sensors on the reference points and target points respectively.

[0132] The transfer function acquisition module 300 is used to acquire the connection point between the wiper motor test bench and the wiper motor, select at least one degree of freedom direction to hammer at the connection point, and acquire the transfer function of the reference point and the target point.

[0133] The response data acquisition module 400 is used to start the wiper motor and acquire vibration response data of the reference point and the target point through the accelerometer.

[0134] The excitation force calculation module 500 is used to calculate the actual excitation force of the wiper motor based on the vibration response data and transfer function of the reference point;

[0135] The excitation force verification module 600 is used to verify the accuracy of the actual excitation force of the wiper motor based on the vibration response data and transfer function of the target point.

[0136] Compared with existing technologies, the excitation force characteristic testing device for wiper systems shown in this embodiment derives the calculation of the true excitation force of the wiper system through the formula derivation module, which is independent of the boundary conditions of the shock absorber region and the vehicle body region. Therefore, different vehicle bodies can be matched to verify their vibration and noise levels at the digital prototype stage without entering the physical prototype stage. By designing a wiper motor test bench, the excitation force calculation module measures the vibration response data and transfer function of the reference point to calculate the true excitation force of the wiper motor. The method is simple and low-cost. Finally, the excitation force verification module measures the vibration response data and transfer function of the target point to verify the accuracy of the true excitation force of the wiper motor, thereby improving the accuracy of the true excitation force calculation. This solves the technical problem of long development cycles and high costs in existing technologies that require matching different vehicle bodies for wiper system testing at the physical prototype stage.

[0137] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0138] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0139] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A method for testing the excitation force characteristics of a windshield wiper system, characterized in that, The method includes: The wiper system is divided into three regions: the excitation source region, the shock absorber region, and the vehicle body region. Based on the parameter information of these three regions, predicted acceleration response data is calculated and derived. This predicted acceleration response data is then replaced with an equivalent actual excitation force. The calculated actual excitation force of the wiper system is independent of the boundary conditions of the shock absorber region and the vehicle body region, including: The wiper system is divided into three areas: the excitation source area, the shock absorber area, and the vehicle body area. The excitation source of the excitation source region, the connection point between the excitation source region and the shock absorber region, the connection point between the shock absorber region and the vehicle body region, and the measurement points for the required test excitation force characteristics of the vehicle body region are respectively the first point, the second point, the third point, and the fourth point. Based on the parameter information of the excitation source region, calculation formula one is derived; based on the parameter information of the shock absorber region, calculation formula two is derived; and based on the parameter information of the vehicle body region, calculation formula three is derived. Based on calculation formulas one, two, and three, calculate the predicted acceleration response data at the fourth point. The excitation source is replaced with an equivalent real excitation force to obtain equivalent predicted acceleration response data. Based on the equivalent predicted acceleration response data and the actual measured acceleration response data, the calculation shows that the actual excitation force of the wiper system is independent of the boundary conditions of the shock absorber region and the vehicle body region. A wiper motor test bench was built, and reference points and target points were marked on the wiper motor test bench. Accelerometers were placed on the reference points and target points respectively. Obtain the connection point between the wiper motor test bench and the wiper motor, and select at least one degree of freedom direction to hammer at the connection point to obtain the transfer function of the reference point and the target point; Start the wiper motor and acquire vibration response data of the reference point and the target point through the accelerometer; Based on the vibration response data and transfer function of the reference point, the actual excitation force of the wiper motor is calculated. Based on the vibration response data and transfer function of the target point, the accuracy of the actual excitation force of the wiper motor is verified.

2. The method for testing the excitation force characteristics of a wiper system according to claim 1, characterized in that, The steps for calculating the actual excitation force of the wiper motor based on the vibration response data and transfer function of the reference point specifically include: ， in, For the actual excitation force of the wiper motor, The transfer function for the reference point, Vibration response data for reference point.

3. The method for testing the excitation force characteristics of a wiper system according to claim 1, characterized in that, The wiper motor test bench includes a base and a frame mounted on the base. The frame includes vertical plates at both ends and a connecting plate connecting the two vertical plates. The wiper motor includes a wiper motor body and a connecting rod assembly connected to the wiper motor body. The connecting rod assembly connects the two vertical plates to form the connection point.

4. The method for testing the excitation force characteristics of a wiper system according to claim 3, characterized in that, The reference point is arranged on the vertical plate, and the target point is arranged on the connecting plate.

5. The method for testing the excitation force characteristics of a wiper system according to claim 1, characterized in that, The steps for deriving calculation formula one based on the parameter information of the excitation source region, calculation formula two based on the parameter information of the shock absorber region, and calculation formula three based on the parameter information of the vehicle body region specifically include: Based on the transfer function from the first point to the second point, the self-interface transfer function of the second point, the load generated at the first point, and the force generated by the suspension at the second point, calculation formula one is derived as follows: ， in, The data represents the active side acceleration response of the suspension at the second point. The transfer function from the first point to the second point. The function is passed to the interface of the second point. The load generated at the first point, This is the force generated when the device is suspended at the second point; Based on the suspension stiffness and frequency at point two, the active side acceleration response data of the suspension at point two, and the passive side acceleration response data of the suspension at point three, calculation formula two is derived, as follows: ， in, The force generated by suspending at the second point, For the suspension stiffness at the second point, The suspension frequency at the second point. The data represents the passive side acceleration response of the suspension at the third point. Based on the self-interface transfer function of point three, calculation formula three is derived, and the calculation formula is as follows: ， in, This is the function passed to the interface of the third point.

6. The method for testing the excitation force characteristics of a wiper system according to claim 5, characterized in that, The steps for calculating the predicted acceleration response data at point four, based on calculation formulas one, two, and three, specifically include: Based on calculation formulas one and three, the response difference is obtained, and the calculation formula is as follows: ， Input the response difference into calculation formula two to obtain the actual force generated by the suspension at the second point. The calculation formula is as follows: ， Based on the force generated by the suspension at the actual second point, the predicted acceleration response data at the fourth point is calculated using the following formula: ， in, For the predicted acceleration response data at point four, This is the transfer function from the third point to the fourth point.

7. The method for testing the excitation force characteristics of a wiper system according to claim 6, characterized in that, The step of replacing the excitation source with an equivalent real excitation force to obtain equivalent predicted acceleration response data specifically includes: The excitation source is replaced with an equivalent real excitation force, and the acceleration response data of the suspension active side at the second point after the equivalent is calculated. The calculation formula is as follows: ， Based on Formulas 2 and 3, and the equivalent acceleration response data of the active side of the suspension at the second point, the force generated by the suspension at the equivalent second point is derived, and the calculation formula is as follows: ， Based on the force generated by the suspension at the equivalent second point, the equivalent predicted acceleration response data is calculated using the following formula: ， in, The equivalent predicted acceleration response data, For the real motivation on the second point, This refers to the equivalent active-side acceleration response data of the suspension at the second point. This refers to the force generated by the suspension at the second point after the equivalent calculation.

8. The method for testing the excitation force characteristics of a wiper system according to claim 7, characterized in that, Based on the equivalent predicted acceleration response data and the actual measured acceleration response data, the calculation process derives the true excitation force of the wiper system from the boundary conditions of the shock absorber region and the vehicle body region. This process specifically includes: By comparing the equivalent predicted acceleration response data with the actual measured acceleration response data, it was found that the equivalent predicted acceleration response data and the actual measured acceleration response data are the same. Therefore, the calculation formula for the equivalent predicted acceleration response data is equal to the calculation formula for the actual predicted acceleration response data. Thus, the actual excitation force of the wiper system is calculated to be independent of the boundary conditions of the shock absorber region and the vehicle body region. The calculation formula is as follows: 。 9. A device for testing the excitation force characteristics of a windshield wiper system, characterized in that, The apparatus is used to implement the excitation force characteristic testing method for a wiper system according to any one of claims 1 to 8, the apparatus comprising: The formula derivation module divides the wiper system into three regions: the excitation source region, the shock absorber region, and the vehicle body region. Based on the parameter information of these three regions, it calculates and derives predicted acceleration response data. This predicted acceleration response data is then replaced with an equivalent actual excitation force. The calculated boundary conditions show that the actual excitation force of the wiper system is independent of the shock absorber region and the vehicle body region, including: The wiper system is divided into three areas: the excitation source area, the shock absorber area, and the vehicle body area. The excitation source of the excitation source region, the connection point between the excitation source region and the shock absorber region, the connection point between the shock absorber region and the vehicle body region, and the measurement points for the required test excitation force characteristics of the vehicle body region are respectively the first point, the second point, the third point, and the fourth point. Based on the parameter information of the excitation source region, calculation formula one is derived; based on the parameter information of the shock absorber region, calculation formula two is derived; and based on the parameter information of the vehicle body region, calculation formula three is derived. Based on calculation formulas one, two, and three, calculate the predicted acceleration response data at the fourth point. The excitation source is replaced with an equivalent real excitation force to obtain equivalent predicted acceleration response data. Based on the equivalent predicted acceleration response data and the actual measured acceleration response data, the calculation shows that the actual excitation force of the wiper system is independent of the boundary conditions of the shock absorber region and the vehicle body region. The calibration point module is used to build a wiper motor test bench, calibrate reference points and target points on the wiper motor test bench, and arrange acceleration sensors on the reference points and target points respectively. The transfer function acquisition module is used to acquire the connection point between the wiper motor test bench and the wiper motor, select at least one degree of freedom direction to hammer at the connection point, and acquire the transfer function of the reference point and the target point. The response data acquisition module is used to start the wiper motor and acquire vibration response data of the reference point and the target point through the accelerometer. The excitation force calculation module is used to calculate the actual excitation force of the wiper motor based on the vibration response data and transfer function of the reference point; The excitation force verification module is used to verify the accuracy of the actual excitation force of the wiper motor based on the vibration response data and transfer function of the target point.

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