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Control system and control method for improving automobile starting vibration noise on basis of braking force

A technology for the starting and control system of a car, which is applied in the field of vibration and noise control of the car braking system, can solve problems such as changes in suspension attitude, achieve the effects of reducing abnormal starting noise, simple structure and remarkable effect

Active Publication Date: 2015-06-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the braking process ends, the normal force on the front and rear wheels returns to the initial state, and the wheels tend to return to the slack state. However, since the front and rear wheels are all braked and locked, the wheels cannot overcome the ground friction and move, preventing the wheelbase from returning to the normal state. The original size, so a pair of forces of equal magnitude and opposite directions are formed between the front and rear wheels, and the suspension attitude changes under the influence of the K&C characteristics of the suspension system

Method used

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  • Control system and control method for improving automobile starting vibration noise on basis of braking force
  • Control system and control method for improving automobile starting vibration noise on basis of braking force
  • Control system and control method for improving automobile starting vibration noise on basis of braking force

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, a control system based on the braking force to improve the abnormal noise of the starting chatter of the automobile is installed on the braking system of the automobile. The braking system includes a brake pedal 1, a brake master cylinder 2 connected with the brake pedal 1, an installation The brake disc 3 on the wheel and the brake caliper 4 matched with the brake disc 3, the control system includes a suspension posture control unit 5, a brake pressure actuator 6, a wheel speed sensor 7 arranged on the wheel and The hydraulic pressure sensor 8 set at the hydraulic output end of the brake master cylinder, the suspension attitude control unit 5 is connected with the wheel speed sensor 7 and the hydraulic pressure sensor 8 respectively, and the brake pressure actuator 6 is connected with the brake master cylinder 2 and the brake caliper 4 respectively .

[0036] The suspension attitude control unit 5 includes a signal acquisition module, a dat...

Embodiment 2

[0044] A kind of control method based on braking force to improve the abnormal noise of automobile starting chatter, step 2) in P 2 for P 1 Takes 1.5% of the value.

[0045] In step 3), after 1 second, the suspension attitude control unit considers that the suspension attitude is already in a relaxed state, and a pair of forces between the front and rear axles that are equal in size and opposite in direction have disappeared, and the suspension attitude control unit sends The command controls the hydraulic pump inside the brake pressure actuator to turn off, and the non-drive shaft builds up the brake pressure again to ensure the safety of the vehicle, and waits for the vehicle to start. Since the suspension posture is already in a relaxed state at this time, when the vehicle restarts , its flutter and abnormal sound phenomenon can be greatly improved.

[0046] Other steps in this embodiment are the same as in Embodiment 1.

Embodiment 3

[0048] A kind of control method based on braking force to improve the abnormal noise of automobile starting chatter, step 2) in P 2 for P 1 Take 2% of the value.

[0049] In step 3), after 1.2 seconds, the suspension attitude control unit considers that the suspension attitude is already in a relaxed state, and a pair of forces between the front and rear axles that are equal in magnitude and opposite in direction have disappeared, and the suspension attitude control unit sends The command controls the hydraulic pump inside the brake pressure actuator to turn off, and the non-drive shaft builds up the brake pressure again to ensure the safety of the vehicle, and waits for the vehicle to start. Since the suspension posture is already in a relaxed state at this time, when the vehicle restarts , its flutter and abnormal sound phenomenon can be greatly improved.

[0050] Other steps in this embodiment are the same as in Embodiment 1.

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Abstract

The invention relates to a control system and a control method for improving automobile starting vibration noise on the basis of braking force. The control system is mounted on an automobile braking system, the braking system comprises a brake pedal, a main brake cylinder connected with the brake pedal, brake discs mounted on wheels and brake calipers mated with the brake discs, the control system comprises a suspension posture control unit, a braking pressure actuator, wheel speed sensors arranged on the wheels and a hydraulic sensor arranged on the hydraulic output end of the main brake cylinder, the suspension posture control unit is respectively connected with the wheel speed sensors and the hydraulic sensor, and the braking pressure actuator is respectively connected with the main brake cylinder and the brake calipers. Compared with the prior art, the invention has the advantages of remarkable effect, simple structure, wide applicability, braking part life extension and the like.

Description

technical field [0001] The invention relates to the technical field of vibration and noise control of an automobile braking system, in particular to a control system and method for improving the abnormal noise of automobile starting flutter based on braking force. Background technique [0002] With the development of social economy and the improvement of residents' living standards, cars are required by more and more users. The user's requirements for the performance of the car are also gradually increasing. On the basis of satisfying the basic use, more and more attention is paid to the comfort of the vibration and noise of the car. The low-speed start chatter problem of automobiles is a vibration and noise problem that occurs in the braking system of automatic transmission vehicles. The root cause of its occurrence is that the coefficient of static friction of the brake friction material is greater than the coefficient of dynamic friction. The factors that affect the abno...

Claims

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Application Information

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IPC IPC(8): B60W30/18B60W10/188B60W10/22
CPCB60W10/188B60W10/22B60W30/18B60W2510/182B60W2520/28B60W2710/18B60W2710/22
Inventor 张立军孟德建张频捷
Owner TONGJI UNIV
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