Fuzzy Sliding Mode Control For Hydraulic Actuated Active Suspension Using Half Car Model

The complexity of half car model and the presence of uncertainties in half car model, make difficulty in developing classical model based controller for active suspension. The nonlinear effect of hydraulic actuator dynamics are difficult to model, so the accurate mathematical model for hydraulic actuator is difficult to create for active suspension. The sliding mode control has ability to model active suspension without depending on mathematical model of system. The fuzzy logic control has been integrated with sliding mode control to reduce the chattering effect of actuator dynamics in active suspension. In this research work, the Fuzzy Sliding Mode Control (FSMC) has been introduced for hydraulic actuated half car model based active suspension to compensate the effect of uncertainties in actuator dynamics and chattering effect in sliding mode control. The results obtained from the simulation of half car model confirms that fuzzy sliding mode control outperforms the conventional controller in terms of body displacement, suspension travel and body acceleration.