Adjustable Valve Semi-Active Suspension System for Passenger Car

Abstract

The suspension of the car plays a very important role in the safety and the comfort of the vehicle and for absorbing the shock waves and give comfort for the driver and passenger. This paper improves the performance of an automobile suspension system by developing electronically adjustable semi-active shock absorber. This achieved by attaching stepper motor for each shock absorber which helps in adjusting the bleed orifice to a certain position that alternates the hydraulic oil flow in the shock absorber between piston’s chamber during the process of compression and rebound. To evaluate the effect of developed semi-active shock absorber on the dynamic behaviour of the vehicle, several tests were carried out on different types of road condition (bumpy, straight-line and roundabout). These tests were used to evaluate the acceleration and ride quality. There is a great range in response when the bleed orifice is opened reached up to 35% between the stiff and soft setting. The value of root means square acceleration (RMS) was calculated and compared with the standard of human exposure to whole-body vibration, which shows an error of 6% slightly. The result shows the effect of electronically controllable shock absorber on a vehicle’s dynamic behaviour — the advantage of electronics to improve the performance of ride comfort and reduced the harms due to undesired vibration.

Multi-Objective Optimization of Absorber Piston Rod Design Parameter using Response Surface Methodology

“…Ride comfort and road control are vital factors in assessing suspension performance [1]. Ride comfort corresponds to the total increasing speed of the vehicle body.…”

Experimental Study of Different materials on Electromagnetic Damping CharacteristicsExperimental Study of Different Materials on Electromagnetic Damping Characteristics

“…A suspension system consists of a spring, damper, and structural components carrying (links) the sprung mass (car chassis). The spring stores energy, the shock absorber dissipates energy proportional to its damping coefficient, and the links restrict the suspension system and limit motion [6]. A suspension system is used as part of a vehicle system because it has several tasks to perform during the vehicle's movement.…”

“…A suspension system is used as part of a vehicle system because it has several tasks to perform during the vehicle's movement. Generally, conflicting demand requirements for a suspension system are to provide a comfortable ride, isolate the vehicle body from road irregularities, enhance the ride handling by producing a continuous road-wheel contact, and support the vehicle weight [6]. Good handling requires a suspension setting that is neither stiff nor soft.…”