A control system and method for improving the abnormal noise of vehicle starting flutter based on driving force

Abstract

The invention relates to a control system and a control method for improving an abnormal automobile start flutter noise based on a driving force. The system is respectively connected with a braking pedal and a braking main cylinder, and is arranged on an automobile braking system and a power assembly or a driving force control system; the system comprises a braking force detection module, a start driving torque control module, wheel speed sensors, an engine, an automatic gearbox and a differential-decelerator assembly, wherein the wheel speed sensor is arranged on each automobile wheel; the engine, the automatic gearbox and the differential-decelerator assembly are sequentially connected in a transmission manner; the differential-decelerator assembly is connected with the automobile wheels; the start driving torque control module is respectively connected with the braking force detection module, the engine, the automatic gear and the wheel speed sensors. Compared with the prior art, the control system and the control method for improving the abnormal automobile start flutter noise based on the driving force have the advantages of significant effects, simple construction and low cost.

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 abnormal vibration and noise at starting of an automobile based on driving 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, and users' requirements for car performance are gradually increasing. On the basis of meeting basic use, more and more attention is paid to the vibration of cars. Noise comfort. [0003] 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 abnormal noise of the c...

AI Technical Summary

Problems solved by technology

The factors that affect the abnormal noise of the car's low-speed start include: the friction characteristics of the friction material, the vibration characteristics of the brake, the vibration characteristics of the suspension system, the K&C characteristics of the front and rear suspensions, the attitude of the suspension at the beginning of the start, and the size of the driving torque , if the friction characteristics of the friction material are changed, the braking performance of the vehicle will be greatly changed. If the vibration characteristics of the brake or suspension system are changed, other vibration and noise performances of the braking system will be affected. If the K&C of the front and rear suspensions are changed characteristics, it will affect the handling stability of the vehicle

[0004] When the driver drives a car with automatic transmission at a standstill and gradually releases the brake pedal to start the car slowly, the driving torque output by the power transmission system and the braking torque output by the braking system will act on the vehicle at the same time. On the drive shaft, stick-slip vibration occurs at the position of the brake friction pair, which affects the comfort of vibration and noise driving the vehicle

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