A novel magneto-rheological shock absorber and vehicle ride comfort control method

Abstract

The invention discloses a novel magneto-rheological shock absorber and a vehicle ride comfort control method, comprising a working cylinder, a piston, a damper and a magneto-rheological fluid. The working cylinder is provided with an adjacent piston cavity and a motor cavity , the piston includes a piston head and a piston rod, the piston head is arranged in the piston cavity, a plurality of first bypass holes are distributed on the piston head, the bottom of the piston rod is fixed to the piston head, and the flow stopper is sleeved on the piston rod and can As the piston moves up and down, there is a transmission mechanism in the motor cavity that can drive the flow baffle to rotate relative to the piston. The bypass hole contains at least one second bypass hole, and the transmission mechanism drives the damper to rotate relative to the piston, which can change the number of aligned first bypass holes and second bypass holes. The magnetorheological fluid is arranged on the piston In the cavity, improve the ride comfort of the vehicle under different load conditions and different road conditions.

Description

technical field [0001] The invention relates to the technical field of automobile NVH, in particular to a novel magneto-rheological shock absorber and a vehicle ride comfort control method. Background technique [0002] When the car is running, the suspension system vibrates due to the excitation of the road surface. In order to improve the ride comfort of the car, a shock absorber is installed in the suspension in parallel with the elastic element. At present, automobile shock absorbers are divided into passive shock absorbers, active shock absorbers and semi-active shock absorbers. Passive shock absorbers are difficult to adapt to different roads and usage conditions due to non-adjustable parameters such as stiffness and damping. Although the active shock absorber can adapt to different roads and usage conditions, its device is complicated, the technical requirements are high, and the price is high. Therefore, the semi-active shock absorber with relatively simple manufac...

AI Technical Summary

Problems solved by technology

[0003] Since the engine and other components of most vehicles are placed at the front end, resulting in the center of gravity of the vehicle, the damping coefficient of the front and rear magneto-rheological shock absorbers is required to be larger in the front and smaller in the rear. For this, there have been designs to drill holes in the piston to reduce the damping coefficient. The damping coefficient of the rear magnetorheological shock absorber is small, but its shock absorption performance becomes worse when the position of the center of gravity of the vehicle changes

Moreover, the damping coefficients of the magnetorheological shock absorbers designed above are all fixed. Since the road surface changes during the driving process of the vehicle, the damping coefficients of shock absorbers required for different road vehicles are not the same. When the vibrator is matched with the vehicle suspension, most of them are only suitable for specific working conditions

The impact of the vehicle on different road surfaces, different center of gravity distribution (when carrying passengers and cargo in the trunk, etc.) and shock absorbers under different working conditions is not fully considered on the ride comfort of the vehicle

Images