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This study attempted to integrate the Pulse Width Modulation (PWM) method and sliding mode control theory to develop quasi-continuous control for an automobile anti-lock braking system. Two controllers are designed in this study. One applies directly by applying quasi-continuous control to achieve ABS slip control. In addition, the quasi-continuous control method was applied to develop pressure tracking control, and then this pressure tracking controller and the acceleration signal of the tire were implemented together to construct an anti-lock braking controller. Both controllers were investigated on a dynamic test stand. Wet road braking was simulated by spraying water on the contact surface between the tire and the flywheel. Excellent braking results not only verify the performance of the sliding PWM method but also provide an alternative to an ABS controller without slip feedback.

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The development of a fuzzy control system for a closed-die hotgorging machine is described. Details of the input and output fuzzy variables and the fuzzy inference procedure are given. Results obtained using the fuzzy control system are presented. These demonstrate the ability of the system accurately to control the amount of energy delivered to the workpiece to keep it within narrow tolerances without overloading the die.

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