Method for improving vibration feedback of vehicle-mounted touch screen based on Fourier transform

Abstract

The invention provides a method for improving vibration feedback of a vehicle-mounted touch screen based on Fourier transform. The method comprises the following steps: S1, establishing a differential equation of a five-degree-of-freedom automobile dynamics model; s2, in combination with a differential equation of the five-degree-of-freedom automobile dynamics model, performing simulation analysis on vibration characteristics in the automobile running process in simulation software to obtain vibration characteristic data of the automobile instrument desk; s3, fitting the target vibration characteristic data of the touch screen with the vibration characteristic data of the automobile instrument desk through Fourier transform to obtain corrected vibration characteristic data of the touch screen; and S4, driving the touch screen to vibrate by using the corrected vibration characteristic data. According to the touch screen subjected to vibration characteristic correction, the influence from automobile vibration is reduced, the vibration feedback effect is closer to the feedback effect when an automobile is static, better vibration feedback experience is obtained, the feeling of passengers on vibration feedback of the touch screen in the driving process is greatly improved, and therefore the driving safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted touch screen vibration feedback, and in particular to a method for improving the vehicle-mounted touch screen vibration feedback based on Fourier transform. Background Art

[0002] With the development of modern automotive electronic technology, the number of touch elements on the dashboard is increasing, and the touch of the touch screen is particularly important. Since the car is in motion, the vibration feedback when touching the central control platform is very important, which can greatly improve driving safety and driver attention.

[0003] Due to the influence of road roughness input and engine vibration when the vehicle is driving, the car is in a vibrating state. At the same time, the touch screen of the car dashboard has inherent vibration. This vibration will have a certain impact on the touch feedback vibration of the car touch screen, resulting in unclear or too strong touch feedback, resulting in false touches, reducing driving experience and affecting driving safety. Summary of the invention

[0004] The present invention provides a method for improving the vibration feedback of a vehicle-mounted touch screen based on Fourier transform, which solves the problem of distortion of the touch vibration feedback of the vehicle touch screen in the prior art.

[0005] The technical solution of the present invention is achieved in this way:

[0006] A first aspect of the present invention provides a method for improving vibration feedback of a vehicle-mounted touch screen based on Fourier transform, comprising the following steps:

[0007] S1, differential equations for the five-degree-of-freedom vehicle dynamics model;

[0008] S2, combining the differential equation of the five-degree-of-freedom vehicle dynamics model, simulates and analyzes the vibration characteristics of the vehicle during driving in the simulation software to obtain the vibration characteristic data of the vehicle instrument panel;

[0009] S3, fitting the target vibration characteristic data of the touch screen with the vibration characteristic data of the automobile instrument panel through Fourier transform to obtain the corrected vibration characteristic data of the touch screen;

[0010] S4, driving the touch screen to vibrate using the corrected vibration characteristic data.

[0011] Specifically, in step S1, the differential equation of the five-degree-of-freedom vehicle dynamics model is established as follows:

[0012]

[0013]

[0014]

[0015]

[0016]

[0017] Wherein, m1, m2, m3, m5 represent the front wheel mass, rear wheel mass, vehicle body mass and instrument panel mass respectively; k1, k2, k3, k4, k5 represent the front wheel stiffness, rear wheel stiffness, front suspension stiffness, rear suspension stiffness and instrument panel connection stiffness respectively; c3, c4, c5 represent the front suspension damping, rear suspension damping and instrument panel connection damping respectively; z1, z2, z3, θ3, z5 represent the front wheel vertical displacement, rear wheel vertical displacement, vehicle body vertical displacement, vehicle body pitch angle and instrument panel vertical displacement respectively; q1, q2 represent the road random input signal respectively; F represents the engine vertical exciting force; a, b, c, l represent the horizontal displacement of the front suspension relative to the vehicle center of mass, the horizontal displacement of the rear suspension relative to the vehicle center of mass, the displacement of the engine center of mass relative to the vehicle center of mass and the horizontal displacement of the instrument panel center of mass relative to the vehicle center of mass respectively; I3 is the body pitch moment of inertia.

[0018] Furthermore, in step S2, the vibration characteristic data of the automobile instrument panel is obtained through simulation analysis as follows:

[0019]

[0020]

[0021]

[0022]

[0023]

[0024] Furthermore, the filtered white noise in the road random input signal is:

[0025]

[0026] Among them, x g (t) represents road displacement, G0 represents road roughness coefficient, U0 represents vehicle forward speed, w(t) represents Gaussian white noise with zero mean, and f0 represents the lower cutoff frequency.

[0027] Specifically, step S3 includes the following steps:

[0028] Decompose the target vibration characteristic data of the touch screen:

[0029]

[0030] Among them, f(t) is the time domain of the target vibration frequency characteristic, a0, a n 、b n is a constant, n is an integer, and ω is the frequency;

[0031] Decompose the vibration characteristic data of the car dashboard:

[0032]

[0033] Among them, f y (t) is the time domain of the vibration frequency characteristic of the instrument panel, a y0 、a yn 、b yn is a constant;

[0034] The decomposed touch screen target vibration characteristic data is fitted with the instrument panel vibration characteristic data to obtain the corrected vibration characteristic data of the touch screen:

[0035]

[0036]

[0037]

[0038] Among them, F(t) is the time domain of the vibration frequency characteristics of the touch screen vibration feedback, F(ω) is the amplitude-period transformation function, and f a (t) is the vibration characteristic data of the touch screen after correction; a a0 、a an 、b an is a constant.

[0039] A second aspect of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method for improving the vibration feedback of a vehicle-mounted touch screen are implemented.

[0040] A third aspect of the present invention provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for improving the vibration feedback of a vehicle-mounted touch screen are implemented.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention establishes a differential equation of a five-degree-of-freedom automobile dynamics model, and uses simulation software to simulate and analyze the vibration characteristics of the automobile during driving; the vibration characteristics of the instrument panel are obtained through the simulation results; the target vibration characteristics and the vibration characteristics of the instrument panel are fitted and corrected through Fourier transform to determine the vibration characteristics of the touch screen vibration, so that the corrected touch screen reduces the influence of the automobile vibration, and makes the vibration feedback effect closer to the feedback effect when the automobile is stationary, so as to obtain a better vibration feedback experience, which greatly improves the passengers' perception of the touch screen vibration feedback during driving, thereby improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A flow chart of a method for improving vibration feedback of a vehicle-mounted touch screen based on Fourier transform according to the present invention;

[0044] Figure 2 This is a diagram of the five-degree-of-freedom vehicle dynamics model architecture in an embodiment of the present invention;

[0045] Figure 3 The rear suspension damping coefficient is increased by 50%, and the vertical vibration acceleration root mean square value of the front and rear instrument panels - speed curve comparison chart;

[0046] Figure 4 The stiffness of the instrument panel connection is reduced by 50%, and the vertical vibration acceleration root mean square value of the front and rear instrument panels-speed curve comparison chart;

[0047] Figure 5 The damping of the instrument panel connection is reduced by 50%, and the vertical vibration acceleration root mean square value of the front and rear instrument panels-speed curve comparison diagram;

[0048] Figure 6 It is the comparison chart of the vertical vibration acceleration root mean square value of the instrument panel when it is unloaded and fully loaded - speed curve;

[0049] Figure 7 The target vibration characteristic decomposition diagram of the touch screen;

[0050] Figure 8 The comparison chart of the target vibration characteristic decomposition and the actual vibration characteristic decomposition of the touch screen when n is 100. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Reference Figure 1 The first aspect of the present invention provides a method for improving the vibration feedback of a vehicle-mounted touch screen based on Fourier transform, comprising the following steps:

[0053] S1, differential equations for the five-degree-of-freedom vehicle dynamics model;

[0054] S2, combining the differential equation of the five-degree-of-freedom vehicle dynamics model, simulating and analyzing the vibration characteristics of the vehicle during driving in simulation software (CAE simulation software is used in this embodiment) to obtain vibration characteristic data of the vehicle instrument panel;

[0055] S3, fitting the target vibration characteristic data of the touch screen with the vibration characteristic data of the automobile instrument panel through Fourier transform to obtain the corrected vibration characteristic data of the touch screen;

[0056] S4, driving the touch screen to vibrate using the corrected vibration characteristic data.

[0057] Specifically, Figure 2 As shown, in step S1, the model is established by assuming that the road excitation of the vehicle is the same for the left and right wheels when the car is driving on the road; the model engine excitation of the car only considers the vertical direction; the road excitation direction only considers the vertical direction. The wheels also only consider the vertical direction; the front and rear wheels of the model car have the same wheel tread when driving, and the road surface roughness is the same except for the phase difference caused by the wheelbase; the model wheel stiffness, suspension stiffness, and instrument panel connection stiffness are regarded as a linear function of speed, and tire damping is ignored; the model frame stiffness and body stiffness must be sufficient, and the vibration mode caused by the elasticity of the frame is not considered;

[0058] The differential equations for establishing the five-degree-of-freedom vehicle dynamics model are as follows:

[0059]

[0060]

[0061]

[0062]

[0063]

[0064] Wherein, m1, m2, m3, m5 represent the front wheel mass, rear wheel mass, vehicle body mass and instrument panel mass respectively; k1, k2, k3, k4, k5 represent the front wheel stiffness, rear wheel stiffness, front suspension stiffness, rear suspension stiffness and instrument panel connection stiffness respectively; c3, c4, c5 represent the front suspension damping, rear suspension damping and instrument panel connection damping respectively; z1, z2, z3, θ3, z5 represent the front wheel vertical displacement, rear wheel vertical displacement, vehicle body vertical displacement, vehicle body pitch angle and instrument panel vertical displacement respectively; q1, q2 represent the road random input signal respectively; F represents the engine vertical exciting force; a, b, c, l represent the horizontal displacement of the front suspension relative to the vehicle center of mass, the horizontal displacement of the rear suspension relative to the vehicle center of mass, the displacement of the engine center of mass relative to the vehicle center of mass and the horizontal displacement of the instrument panel center of mass relative to the vehicle center of mass respectively; I3 is the body pitch moment of inertia.

[0065] Furthermore, in step S2, the vibration characteristic data of the automobile instrument panel is obtained through simulation analysis as follows:

[0066]

[0067]

[0068]

[0069]

[0070]

[0071] Specifically, in step S2, the vehicle model data is substituted into the CAE simulation software, and the road surface is selected as a Class B road surface. By changing a single variable of the model (such as the damping coefficient of the rear suspension, the stiffness of the instrument panel connection, the damping of the instrument panel connection, no load / full load, etc.), simulation analysis is performed at different vehicle speeds to obtain the root mean square value of the vibration acceleration in the vertical direction of the instrument panel-vehicle speed curve, such as Figures 3 to 6 shown.

[0072] Furthermore, the filtered white noise in the road random input signal is:

[0073]

[0074] Among them, x g (t) represents road displacement, G0 represents road roughness coefficient, U0 represents vehicle forward speed, w(t) represents Gaussian white noise with zero mean, and f0 represents the lower cutoff frequency.

[0075] Specifically, the vertical exciting force of the engine is:

[0076] F=λM j R 2 cos(2wt);

[0077] Where λ represents the ratio of the engine crankshaft radius to the connecting rod length; M j It represents the mass of the reciprocating part of each cylinder; R represents the crank radius, and w represents the angular velocity of the crankshaft.

[0078] Specifically, step S3 includes the following steps:

[0079] Decompose the target vibration characteristic data of the touch screen, such as Figure 7 As shown:

[0080]

[0081] Among them, f(t) is the time domain of the target vibration frequency characteristic, a0, a n 、b n is a constant, n is an integer, and ω is the frequency;

[0082] Decompose the vibration characteristic data of the car dashboard:

[0083]

[0084] Among them, f y (t) is the time domain of the vibration frequency characteristic of the instrument panel, a y0 、a yn 、b yn is a constant;

[0085] The decomposed touch screen target vibration characteristic data is fitted with the instrument panel vibration characteristic data to obtain the corrected vibration characteristic data of the touch screen:

[0086]

[0087]

[0088]

[0089] Among them, F(t) is the time domain of the vibration frequency characteristics of the touch screen vibration feedback, F(ω) is the amplitude-period transformation function, and f a (t) is the vibration characteristic data of the touch screen after correction; a a0 、a an 、b an is a constant.

[0090] In the above Fourier transform, in order to comprehensively consider the vibration characteristic accuracy and algorithm workload, the value range of n is set to 1 to 100 to obtain a vibration frequency characteristic close to the actual one and a smaller algorithm workload; when n is 100, the target vibration characteristic decomposition diagram of the touch screen is basically consistent with the actual vibration characteristic decomposition diagram of the touch screen, such as Figure 8 shown.

[0091] A second aspect of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method for improving the vibration feedback of a vehicle-mounted touch screen are implemented.

[0092] A third aspect of the present invention provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for improving the vibration feedback of a vehicle-mounted touch screen are implemented.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for improving vibration feedback of a vehicle-mounted touch screen based on Fourier transform, characterized in that: The following steps are involved: S1, differential equations for the five-degree-of-freedom vehicle dynamics model; S2, combining the differential equation of the five-degree-of-freedom vehicle dynamics model, simulates and analyzes the vibration characteristics of the vehicle during driving in the simulation software to obtain the vibration characteristic data of the vehicle instrument panel; S3, fitting the target vibration characteristic data of the touch screen with the vibration characteristic data of the automobile instrument panel through Fourier transform to obtain the corrected vibration characteristic data of the touch screen; S4, driving the touch screen to vibrate using the corrected vibration characteristic data.

2. The method for improving the vibration feedback of a vehicle-mounted touch screen based on Fourier transform as claimed in claim 1, characterized in that: In step S1, the differential equation of the five-degree-of-freedom vehicle dynamics model is established as follows: Wherein, m1, m2, m3, m5 represent the front wheel mass, rear wheel mass, vehicle body mass and instrument panel mass respectively; k1, k2, k3, k4, k5 represent the front wheel stiffness, rear wheel stiffness, front suspension stiffness, rear suspension stiffness and instrument panel connection stiffness respectively; c3, c4, c5 represent the front suspension damping, rear suspension damping and instrument panel connection damping respectively; z1, z2, z3, θ3, z5 represent the front wheel vertical displacement, rear wheel vertical displacement, vehicle body vertical displacement, vehicle body pitch angle and instrument panel vertical displacement respectively; q1, q2 represent the road random input signal respectively; F represents the engine vertical exciting force; a, b, c, l represent the horizontal displacement of the front suspension relative to the vehicle center of mass, the horizontal displacement of the rear suspension relative to the vehicle center of mass, the displacement of the engine center of mass relative to the vehicle center of mass and the horizontal displacement of the instrument panel center of mass relative to the vehicle center of mass respectively; I3 is the body pitch moment of inertia.

3. The method for improving the vibration feedback of a vehicle-mounted touch screen based on Fourier transform as claimed in claim 2, characterized in that: In step S2, the vibration characteristic data of the automobile instrument panel are obtained through simulation analysis as follows:

4. A method for improving vibration feedback of a vehicle-mounted touch screen based on Fourier transform as claimed in claim 2 or 3, characterized in that: The filtered white noise in the road random input signal is: Among them, x g (t) represents road displacement, G0 represents road roughness coefficient, U0 represents vehicle forward speed, w(t) represents Gaussian white noise with zero mean, and f0 represents the lower cutoff frequency.

5. The method for improving the vibration feedback of a vehicle-mounted touch screen based on Fourier transform as claimed in claim 1, characterized in that: Step S3 specifically includes the following steps: Decompose the target vibration characteristic data of the touch screen: Among them, f(t) is the time domain of the target vibration frequency characteristic, a0, a n 、b n is a constant, n is an integer, and ω is the frequency; Decompose the vibration characteristic data of the car dashboard: Among them, f y (t) is the time domain of the vibration frequency characteristic of the instrument panel, a y0 、a yn 、b yn is a constant; The decomposed touch screen target vibration characteristic data is fitted with the instrument panel vibration characteristic data to obtain the corrected vibration characteristic data of the touch screen: Among them, F(t) is the time domain of the vibration frequency characteristics of the touch screen vibration feedback, F(ω) is the amplitude-period transformation function, and f a (t) is the vibration characteristic data of the touch screen after correction; a a0 、a an 、b an is a constant.

6. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the computer program, the steps of the method for improving the vibration feedback of a vehicle-mounted touch screen as claimed in any one of claims 1 to 5 are implemented.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for improving the vibration feedback of a vehicle-mounted touch screen as claimed in any one of claims 1 to 5 are implemented.

Images