This paper presents a wheel slip control via sliding mode controller for a new anti-lock brake system (ABS) of a passenger vehicle using electrorheological (ER) valve pressure modulator. The principal design parameters of the ER valves and hydraulic booster are appropriately determined by considering braking pressure variation during ABS operation. An electrically controllable pressure modulator using the ER valves is then constructed and its governing equations are derived. Subsequently, the pressure control performance of the new pressure modulator is experimentally evaluated. The governing equations of motion for a quarter car wheel model are derived and the sliding mode controller is formulated for wheel slip control. Hardware in the loop simulation (HILS) for braking performance evaluation is undertaken in order to demonstrate the effectiveness of the proposed ABS associated with the ER valve pressure modulator.
KEYWORDS: Control systems, Actuators, Manufacturing, Design for manufacturability, Smart materials, Smart structures, Chemical species, Amplifiers, Sensors, Time metrology
This paper proposes a novel type of the piezoactuator-driven hydraulic pump(piezo pump in short) in order to control the position of a cylinder system. The piezo pump is operated by the dynamic motion of a diaphragm directly attached to the piezoactuator. The governing equation of the flow motion of the piezo pump id derived and an appropriate size of the piezo pump is designed and manufactured. The pressure drop and flow rate of the pump are experimentally evaluated at various voltages. The piezo pump is then incorporated with a single-rod cylinder system. A sliding mode controller is designed to achieve an accurate position control of the cylinder and practically realized. Position control performances for step and sinusoidal trajectories are evaluated and presented in time domain.
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