22-09-2014, 02:40 PM
Abstracts: Nowadays, the every vehicle existed mostly still using the two wheel steering system to control the movement of the vehicle whether it is front wheel drive, rear wheel drive or all wheel drive. But due to the awareness of safety, four wheel steering vehicles are being used increasingly due to high performance and stability that they bring to the vehicles. A Four Wheel steering (4WS) System named as “Quadra Steering System”. Here in this System both front as well as rear wheels can be steered according to space available for turning. If a car could automatically compensate for an under steer/Over steer problem, the driver would enjoy nearly neutral steering under varying operating conditions. Four-wheel steering is a serious effort on the part of automotive design engineers to provide near-neutral steering. For parking and low-speed manoeuvres, the rear Wheel steer in the opposite direction of the front wheels, allowing much sharper turns. At higher speeds, the rest wheels steer in the same direction as the front wheels. The result is more stability and less body lean during fast lane changes and turns because the front wheels don’t have to drag non-steering rear wheels onto the path. Quadra steer is system that gives full size vehicles greater ease while driving at low speed, and improves stability, handling and control at higher speed. The scope includes commonly used methods found in practice as well as some theoretical methods found in various literatures from other areas of research. A multi-functional four-wheel steering system could improve directional stability, sharp turning performance, and parking performance of a vehicle. From concept validation and controller design of the active pinion, the models have been proven effective to explain dynamic phenomena related to Quadra Steering systems.