Abstract
This paper investigates the effect of road quality on the control strategies of active suspension system integrated with anti-lock braking system in a quarter-car vehicle model. To this aim, two optimal control laws for active suspension system and anti-lock braking system are analytically designed using the responses prediction of a continuous 4 degree of freedom non-linear vehicle model including longitudinal and vertical dynamics. The optimal feature of the suspension controller provides the possibility of adjusting the weighting factors to meet the ride comfort and road holding criteria on roads with various qualities. It is shown that, regulating the tire deflection in a constant value to increase the tire normal load leads to instability of suspension system. Therefore, the active suspension system cannot influence on the anti-lock braking system performance on flat roads in a quarter car model. The same effect is observed for hard braking on irregular roads with good quality. In this condition, the active suspension system should be focused on the ride comfort as its first aim. However, for braking on irregular roads with poor quality, decreasing the variation of tire deflection to avoid the tire from jumping is effective in reducing the stopping distance.
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