阅读说明：本技术 一种汽车半主动悬架阻尼控制方法 (Automobile semi-active suspension damping control method ) 是由 韩春松 徐凤霞 宋丁丁 孟岩 邵会 解恺 于 2021-02-02 设计创作，主要内容包括：本发明提供了一种汽车半主动悬架阻尼控制方法,包括采集模块、转换模块、处理模块和控制模块。所述控制方法包括以下步骤：S1：通过传感器采集当前簧载质量；S2：通过传感器采集汽车速度信息；S3：将上述信息分别输入A/D转换模块；S4：将转换后的数字信息输入控制模块；S5：控制模块分析并输出控制信号U；S6：将控制信号U进行输入D/A转换模块,输出控制电压对悬架阻尼进行调整。本发明有以下效果：采用多点测量方式,通过采集簧载质量和车身速度信息,通过控制器中的模糊控制算法改变半主动悬架的阻尼,有效的提升了悬架的舒适性和安全性。(The invention provides a damping control method for a semi-active suspension of an automobile. The control method comprises the following steps: s1: acquiring the current sprung mass through a sensor; s2: acquiring automobile speed information through a sensor; s3: inputting the information into A/D conversion module; s4: inputting the converted digital information into a control module; s5: the control module analyzes and outputs a control signal U; s6: and inputting the control signal U into the D/A conversion module, and outputting a control voltage to adjust the damping of the suspension. The invention has the following effects: the multi-point measurement mode is adopted, the damping of the semi-active suspension is changed through acquiring the information of the spring load mass and the speed of the vehicle body and the fuzzy control algorithm in the controller, and the comfort and the safety of the suspension are effectively improved.)

1. A semi-active suspension damping control method for an automobile, comprising the steps of:

s1: acquiring the current sprung mass through a sensor;

s2: acquiring automobile speed information through a sensor;

s3: inputting the information into A/D conversion module;

s4: the converted digital information is input into a control module;

s5: the control module analyzes and outputs a control signal U;

s6: and inputting the control signal U into the D/A conversion module, and outputting a control voltage to adjust the damping of the suspension.

2. The method as claimed in claim 1, wherein the sensor is capable of acquiring real-time varying sprung mass signals.

3. The method of claim 1, wherein the sprung mass sensor comprises a hall sensor and a photosensor.

4. The method of claim 1, wherein the velocity information sensor is a diffused silicon pressure transducer.

5. The method for controlling the damping of the semi-active suspension of the automobile according to claim 1, wherein the control module adopts a double-input single-output controller and adopts a fuzzy control algorithm, and the fuzzy control algorithm is as follows:

the sprung mass may vary from 400Kg to 600Kg, and the sprung mass data are labeled:

light (400 Kg-499 Kg) and heavy (500 Kg-600 Kg);

the vehicle body speed can vary from 0Km/h to 120Km/h, and is labeled as:

slow (0-69 km/h) and fast (70-120 km/h);

the semi-active suspension damping force can vary from 0N to 1200N, with the damping force labeled:

small (0N-399N), medium (400N-799N), large (800N-1200N)

The fuzzy rule is formulated according to expert experience as follows:

if the sprung mass is light and the vehicle body speed is slow; then the damping force is small;

if the sprung mass is light and the vehicle body speed is fast; then the damping force is medium;

if the sprung mass is heavy and the vehicle body speed is slow; then the damping force is medium;

if the sprung mass is heavy and the vehicle body speed is fast; the damping force is large.

6. The method as claimed in claim 1, wherein the damping adjustment device is a magnetorheological damper, and the damping force can be adjusted by changing the voltage.

Technical Field

The invention relates to the technical field of vehicle design, in particular to a control method of an automobile semi-active suspension.

Background

The automobile suspension is an important structural component for connecting the wheels and the frame, can absorb road vibration, and meanwhile, the wheel adhesion is increased, and the running stability and safety of the automobile are improved. The suspensions on the market today can be divided into active, semi-active and passive suspensions. At present, the most widely used suspension is a passive suspension, and the elasticity and the damping coefficient of the passive suspension cannot be changed along with the change of external working conditions.

The active suspension is through gathering different operating mode information to exert the active control power of certain size to the suspension, effectively change the softness and hardness of suspension, make the suspension have better damping characteristic, can also provide certain holding power when better filtration road surface is jolted. The active suspension has the disadvantages of requiring external energy supply, and having a complex structure and high cost, so that the active suspension cannot be used in a large area at present.

The semi-active suspension can be regarded as a suspension system consisting of a spring and a shock absorber with variable characteristics, and although the suspension system cannot be optimally controlled and adjusted along with external input, the suspension system can adjust the rigidity of the spring and the damping state of the shock absorber according to optimal parameter commands of the spring and the shock absorber under various conditions stored in a computer, so that the suspension system has good adaptability to complicated and variable road conditions.

In view of the above, it would be desirable to provide a suspension system that is low in cost, relatively simple in structure, and comfortable.

Disclosure of Invention

Aiming at the current situation that the development of the existing passive suspension reaches the mature stage, the cost of the active suspension is high, the structure is complex, and the active suspension cannot be used in a large area, the invention provides a semi-active suspension control method, so that the acceleration and the suspension stroke of the semi-active suspension controlled by the method are reduced to a certain extent compared with the passive suspension, namely, the comfort and the safety are improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

a damping control method for a semi-active suspension of an automobile comprises an acquisition module, a conversion module, a processing module and a control module. The control method comprises the following steps:

s1: acquiring the current sprung mass through a sensor;

s2: acquiring automobile speed information through a sensor;

s3: respectively inputting the sprung mass and the vehicle body speed information into an A/D conversion module;

s4: inputting the converted digital information into a control system;

s5: the control system outputs a control signal U;

s6: and inputting the control signal U into the D/A conversion module, and outputting a control voltage to adjust the damping of the suspension.

Furthermore, the sensor can collect real-time change spring load mass signals, and the sampling period can be adjusted according to different working conditions.

Further, the sprung mass sensor may employ a photoelectric sensor and a hall sensor, and generates a pulse voltage signal by the rotation of the tire.

Furthermore, the speed information acquisition sensor is a diffused silicon pressure transmitter, and generates a certain voltage signal through the extrusion of the sprung mass.

Furthermore, the control module adopts a double-input single-output controller and a fuzzy control algorithm. The fuzzy control algorithm is as follows:

the sprung mass may vary from 400Kg to 600Kg, and the sprung mass data are labeled:

light (400 Kg-499 Kg) and heavy (500 Kg-600 Kg);

the vehicle body speed can vary from 0Km/h to 120Km/h, and is labeled as:

slow (0-69 km/h) and fast (70-120 km/h);

the semi-active suspension damping force can vary from 0N to 1200N, with the damping force labeled:

small (0N-399N), medium (400N-799N), large (800N-1200N)

The fuzzy rule is formulated according to expert experience as follows:

(1) if the sprung mass is light and the vehicle body speed is slow; then the damping force is small;

(2) if the sprung mass is light and the vehicle body speed is fast; then the damping force is medium;

(3) if the sprung mass is heavy and the vehicle body speed is slow; then the damping force is medium;

(4) if the sprung mass is heavy and the vehicle body speed is fast; then the damping force is large;

furthermore, the damping adjusting device is a magnetorheological shock absorber, and the damping force of the damping adjusting device can be adjusted by changing voltage.

The control method utilizes the characteristics of simple structure and low cost of the semi-active suspension, combines a fuzzy control algorithm, and simultaneously takes the complexity and the control speed of the control module into balanced consideration, adopts the double-input single-output controller, can change the damping force of the semi-active suspension in real time, and improves the comfort and the safety of the suspension.

Drawings

Fig. 1 is a flowchart of a damping control method for a semi-active suspension of an automobile according to the present embodiment;

FIG. 2 is a configuration diagram of each module of the control system;

FIG. 3 is a simulation diagram of the acceleration and suspension travel of the semi-active suspension and the passive suspension adopting the control method in the embodiment.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and that not all embodiments are intended to be exhaustive. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.

As shown in fig. 1 and 2, the core of the present invention is to provide a semi-active suspension damping control method, which can improve the performance of a semi-active suspension with a relatively simple structure and low cost.

As shown in fig. 3, the reaction appears in suspension performance as: by adopting the fuzzy control method, the semi-active suspension is excited on a certain road surface, so that the suspension stroke and the vertical acceleration are reduced to a certain extent, and the riding comfort of the suspension is improved.

The invention provides a damping control method for a semi-active suspension of an automobile, which comprises the following steps:

step S1: acquiring the current sprung mass through a sensor;

the sensor is a pressure sensor, is placed above the suspension, is directly connected with the vehicle body, and is converted into the vehicle body mass by reading pressure data;

step S2: acquiring vehicle body speed information through a sensor;

the sensor adopts a photoelectric grating sensor, is arranged above the hub, obtains a required pulse signal through the rotation of the hub, and further obtains the speed information of the vehicle body through conversion;

step S3: inputting the information into A/D conversion module;

because the signals collected by the sensor are analog signals and cannot be directly processed by the control module, the analog signals are converted into digital signals by the A/D conversion module and are processed by a control algorithm arranged in the control module;

step S4: the converted digital information is input into a control module;

the information obtained by S1 and S2 is converted into a flag by quantization,

the sprung mass may vary from 400Kg to 600Kg, and the sprung mass data are labeled:

light (400 Kg-499 Kg) and heavy (500 Kg-600 Kg);

the vehicle body speed can vary from 0Km/h to 120Km/h, and is labeled as:

slow (0-69 km/h) and fast (70-120 km/h);

the semi-active suspension damping force can vary from 0N to 1200N, with the damping force labeled:

small (0N-399N), medium (400N-799N), large (800N-1200N)

Step S5: the control module analyzes and outputs a control signal U;

the control module adopts an MCS-51 single chip microcomputer as a processing unit, the control algorithm adopts a fuzzy control method and sets 4 fuzzy rules according to the expert experience of the industry:

(1) if the sprung mass is light and the vehicle body speed is slow; then the damping force is small;

(2) if the sprung mass is light and the vehicle body speed is fast; then the damping force is medium;

(3) if the sprung mass is heavy and the vehicle body speed is slow; then the damping force is medium;

(4) if the sprung mass is heavy and the vehicle body speed is fast; then the damping force is large;

step S6: and outputting a control voltage to adjust the damping of the suspension by a control signal U through a D/A conversion module. The suspension adopts the magneto-rheological shock absorber to change the strength of a magnetic field through different voltages so as to control the magnitude of the damping force.

Above-mentioned technical scheme can combine this trade expert suggestion according to the change of vehicle spring load mass and speed, in time adjusts the damping force of semi-active suspension through the fuzzy control algorithm, promotes driving comfort, makes the tire in time adhere to ground through the improvement of suspension stroke, promotes the security and the control ability of suspension. Compared with the conventional passive suspension, the semi-active suspension controlled by the control method has better comfort and safety.