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This paper illustrates the problem of improving ride and handling characteristics of an All Terrain Vehicle (International BAJA) using Input based control. Based on the virtual model seven DOF mathematical model is developed. Fuzzy control system is developed and incorporated to assist MATLAB SIMULINK program in the simulation process, to suppress vertical heave motion of the ATV as well as improve the handling characteristics also. In ATV front wheels (both left and right fitted with conventional dampers) are provided with IR sensor, which gives the input to the rear suspensions through the developed Fuzzy control system. Rear suspensions are fitted with OEM MR Dampers (MRD). Steering wheel sensor gives the direction of the steering position and this input is given to Fuzzy. Simulation results show that the projected process furnish better results of both ride and handling characteristics.

A semi-active suspension system (SASS) uses a damper whose damping rates can be varied automatically, by the influence of an electromagnet, in real-time according to the continuously changing road conditions. The method by which the damper is controlled is one of the crucial factors that ultimately determine the success or failure of it. In order to achieve success, the rear suspension damper is controlled based on the inputs from sensors placed at front part of a vehicle using H✓ Skyhook Input-Based control. The test vehicle is an All-Terrain Vehicle (ATV) used in the standard of BAJASAE. This study includes a suspension system comprising of two controllable magneto-rheological dampers, associated sensors and controller. This paper reports the simulation result and performance of input-based control of SASS fitted in a full car model.