CN105667241A - Intelligent emergency shock absorption system of automobile - Google Patents

Abstract

The invention belongs to the field of automobile component manufacturing, and discloses an intelligent emergency shock absorption system of an automobile. The shock absorption system consists of an optical measurement and photographing system, an electrical control system and a mechanical and hydraulic shock absorption system, wherein the optical measurement and photographing system is mounted in front of an inner front wheel of an automobile body and is used for acquiring automobile leaping height information; a single-chip microcomputer of the electrical control system starts an automatic adjustment system to identify an image and establish an input signal model, calculate a response moment by a trisection interpolation algorithm, then calculate equivalent damping by enlarging the response moment through the reverse method, send a digital damping adjustment instruction, calculate a specific regulating quantity of a throttling valve according to the equivalent damping, and finally, transmit the specific regulating quantity of the throttling valve to the mechanical and hydraulic shock absorption system, so that the damping of a hydraulic shock absorber is adjusted by adjusting the flow of the throttling valve. The shock absorption system integrates machinery, electronics, hydraulics and optics and can intelligently control the damping of the hydraulic shock absorber at proper time through the single-chip microcomputer, and is particularly suitable for the automobile to run on a complicated feature landform.

Description

An intelligent emergency vibration reduction system for automobiles

technical field

The invention relates to an automobile intelligent emergency vibration reduction system and a control method, which can be applied to the emergency vibration reduction when the automobile is suddenly impacted, and belongs to the field of automobile component manufacturing.

Background technique

In recent years, with the popularity of automobiles entering the family, traffic accidents are increasing day by day. Accidents such as breaking the expressway railing and falling down the hillside, falling in the viaduct and other accidents have occurred from time to time. High requirements, in addition to the safety airbag protection when the car collides, it is also hoped that there is another measure that can play an important protective role in sudden accidents. Installing a buffer and vibration damping device on the car can solve this problem. When a sudden fall occurs, the shock absorbing device plays a good role in buffering, which can effectively improve the safety of the car. In addition, in many thrilling sports, such as: car off-road driving, sometimes there will be a large leap in height due to rough roads. In this case, it is necessary to adjust the shock absorption system in an emergency. This system can complete some difficult movements. At present, with the rapid development of the automobile industry, the requirements for high performance and high reliability of automobiles are getting higher and higher. Therefore, the demand for timely adjustment of vibration reduction systems continues to rise, and automotive intelligent emergency vibration reduction systems will have a broad market Application prospects.

Contents of the invention

Based on the current state of the art, the purpose of the present invention is to provide an intelligent emergency vibration reduction system for automobiles, adding an insurance system to ensure the safety of the driver.

In order to achieve the purpose of the present invention, the present invention combines the optical measurement and photographic system with the electrical control system, and adopts computer programs to control the automobile machinery and the hydraulic damping system. The specific technical solutions are as follows:

The automobile intelligent emergency vibration reduction system is composed of three parts: an optical measurement and camera system, an electrical control system, and a mechanical and hydraulic vibration reduction system. The optical measurement and camera system is connected to the electrical control system, and the electrical control system is connected to the mechanical and hydraulic vibration reduction systems. The electrical control system includes an automatic adjustment system, an image recognition system, and the mechanical and hydraulic damping system includes adjusting a throttle valve and a hydraulic shock absorber. Leap height information, turn on the automatic adjustment system through the single-chip microcomputer of the electrical control system, establish an input signal model for image recognition, calculate the response time by using the trisection interpolation algorithm, calculate the equivalent damping by amplifying the response time, and then issue a digital damping adjustment command , the specific adjustment amount of the throttle valve is further calculated through the equivalent damping, and finally, the specific adjustment amount of the throttle valve is transmitted to the mechanical and hydraulic damping system, and the damping of the hydraulic shock absorber is adjusted by adjusting the flow rate of the throttle valve, thereby playing a role The function of damping and buffering.

Preferred solution: the mechanical and hydraulic damping system is located inside the vehicle body, between the four wheels.

The steps of the response time algorithm are as follows:

(1) Use the advance and retreat method to determine the initial unimodal interval [a,b].

(2) Determine the number of iterations K to be calculated according to the iteration precision ε.

$\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; \&Greater\; Equal;</span>\frac{\mathrm{<span\; class="notranslate">\; l</span>}\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}{\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; l</span>}\mathrm{<span\; class="notranslate">\; no</span>}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}}$

(3) Divide the interval into three equal parts, and insert two points x ₁ , x ₂ at the equal division points.

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; )</span>\\ {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; )</span>\end{array}\right.$

(4) Calculate function values f ₁ , f ₂ at x ₁ , x ₂ .

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>\\ {\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>\end{array}\right.$

(5) Shorten the search interval according to the comparison of function values.

1) If f ₁ ≤ f ₂ , discard [x ₂ ,b], get a new interval [a,x ₂ ], and perform the following replacement

b←x ₂

2) If f ₁ >f ₂ , discard [a,x ₁ ], get a new interval [x ₁ ,b], and perform the following replacement

a←x ₁

(6) Carry out convergence judgment.

1) If |b ^(k) -a ^(k) |≤ε, output the optimal solution

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; x</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; a</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; b</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; f</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; )</span>\end{array}\right.$

2) If |b ^(k) -a ^(k) |>ε, continue to iterate, namely: repeat (3)——(5).

The specific programming flow chart is shown in Figure 3.

The advantages of the present invention are: the damping system integrates machinery, electronics, hydraulic pressure and optics into one body, realizes timely intelligent control of the damping of the hydraulic shock absorber through a single-chip microcomputer, thereby playing the role of timely damping, adding an insurance system, improving It ensures the safety and reliability of the car, and ensures the safety of the driver. In the calculation of the response time algorithm, the trisection interpolation algorithm is simple, easy to program, and has high calculation accuracy. It can solve complex one-dimensional vibration problems at the expense of certain calculation accuracy. The vibration reduction system is especially suitable for vehicles driving on complex terrain features. .

Description of drawings

Fig. 1 is a schematic diagram of the working situation of the emergency vibration reduction total system of the present invention; 1—optical measurement and camera system, 2—electrical control system, 3—mechanical and hydraulic vibration reduction system.

Fig. 2 is a schematic diagram of the working principle of the emergency vibration reduction total system of the present invention.

Fig. 3 is a computer flow chart of the emergency vibration reduction total system of the present invention.

detailed description

In order to better illustrate the present invention, give examples as follows:

Example 1

The automobile intelligent emergency vibration reduction system is composed of three parts: optical measurement and camera system 1, electrical control system 2, mechanical and hydraulic vibration reduction system 3, optical measurement and camera system 1 is connected to electrical control system 2, and electrical control system 2 is connected to mechanical And the hydraulic damping system 3. The mechanical and hydraulic damping system 3 is located inside the car body, between the four wheels. It is characterized in that the optical measurement and camera system 1 is installed in front of the front wheels in the car body to collect information on the flying height of the car. , through the single-chip microcomputer of the electrical control system, the automatic adjustment system is turned on, the input signal model is established for image recognition, and the response time is calculated by using the trisection interpolation algorithm. Damping further calculates the specific adjustment amount of the throttle valve, and finally, transmits the specific adjustment amount of the throttle valve to the mechanical and hydraulic damping system, and adjusts the damping of the hydraulic shock absorber by adjusting the flow rate of the throttle valve, thereby achieving vibration reduction The role of the buffer.

The optical measuring and photographing system adopts the connection mode of an optical measuring instrument and a digital camera to collect information.

The response time calculation example is as follows:

For the overall vibration response model of a vehicle subjected to step excitation, the expression of the function is as follows:

y(t)＝0.0005[1-e- ^1.5t (cos1.94t+0.77sin1.94t)]

Convergence accuracy ε = 0.08, find the maximum response time of the vehicle vibration.

Solution: Transform the model into the problem of finding the minimum value of the following function

f(t)＝e ^-1.5t (cos1.94t+0.77sin1.94t)-1

Firstly, the unimodal interval of the function is determined by using the advance and retreat method, the initial point t ₀ =0, and the initial step size α ₀ =0.1. The calculation process is shown in Table 1.

Table 1 The method of advance and retreat determines the calculation process of the unimodal interval of the function

t 0 0.1 0.3 0.7 1.5 3.1 f(t) 0 -0.028 -0.197 -0.663 -1.084 -0.993

Through the above calculation, the unimodal interval [a,b]=[0.7,3.1] of the function.

according to:

Therefore, the trisection optimization algorithm needs to iterate 9 times.

according to:

Therefore, the golden section optimization algorithm needs to iterate 8 times.

Calculate the first derivative of a function according to advanced mathematics

f'(t)=0 to obtain the optimal solution of theoretical analysis: t=1.6183

The iterative calculation process of the trisection interpolation algorithm is shown in Table 2.

Table 2 Iterative calculation process of trisection interpolation algorithm

${\mathrm{<span\; class="notranslate">\; t</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; a</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 9</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; b</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 9</span>}<span\; class="notranslate">\; )</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1.5873</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1.6498</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.6186</span>}$

The iterative calculation process of the golden section algorithm is shown in Table 3.

Table 3 Golden Section Algorithm Iterative Calculation Process

${\mathrm{<span\; class="notranslate">\; t</span>}}^{<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; a</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; b</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; )</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1.5973</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1.6483</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.6228</span>}$

Table 4 shows the comparison of calculation results between the trisecting interpolation algorithm and the golden section interpolation algorithm.

Table 4 Comparison of calculation results between trisection interpolation algorithm and golden section algorithm

It can be seen from Table 4 that although the trisection interpolation algorithm iterates one more time than the golden section algorithm, under the same convergence accuracy requirements, the calculation accuracy of the trisection interpolation algorithm is significantly improved, and the relative error with the theoretical value is only 0.02%.

Claims (2)

1. The intelligent emergency vibration reduction system for automobiles consists of three parts: optical measurement and camera system, electrical control system, mechanical and hydraulic vibration reduction system. The optical measurement and camera system is connected to the electrical control system, and the electrical control system is connected to the mechanical and hydraulic vibration reduction system. , the electrical control system includes an automatic adjustment system, an image recognition system, and the mechanical and hydraulic damping system includes adjusting a throttle valve and a hydraulic shock absorber. The information of the flying height of the car, the automatic adjustment system is turned on by the single-chip microcomputer of the electrical control system, the input signal model is established for image recognition, and the response time is calculated by using the trisection interpolation algorithm, and the equivalent damping is obtained by amplifying the response time, and then digital damping adjustment is issued Instructions, the specific adjustment amount of the throttle valve is further calculated through the equivalent damping, and finally, the specific adjustment amount of the throttle valve is transmitted to the mechanical and hydraulic damping system, and the damping of the hydraulic shock absorber is adjusted by adjusting the flow rate of the throttle valve. 2. The automobile intelligent emergency damping system according to claim 1, wherein the mechanical and hydraulic damping systems are located between the four wheels inside the vehicle body.