CONTROL APPARATUS FOR VALVE IN ELECTRO-HYDRAULIC BRAKE SYSTEM

A valve control device in an electro-hydraulic brake system is provided to output a final control gain to control the valve by adding a control gain obtained by a first subtractor and a feed forward operator with a control gain obtained by a second subtractor and feedback operator comprised in a valve control unit, thereby allowing precise control of the brake pressure of wheel cylinders. A valve control device in an electro-hydraulic brake system comprises a high pressurized accumulator and a hydraulic circuit connecting each wheel cylinders, a valve(7) installed to the hydraulic circuit and regulating the brake pressure of the wheel cylinders, and a valve controlling unit(30) controlling opening and closing of the valve by taking into account the pressure difference between the accumulator and the wheel cylinders. The valve control unit includes a first subtractor(31) and a feed forward operator(32) for controlling the feed forward, a second subtractor(33) and a feedback operator(34) for controlling the feedback, and an adder(35) outputting the final control gain by adding the control gain obtained by feed forward operator and the control gain obtained by the feedback operator. The first subtractor supplies the pressure difference to the feed forward operator, and the feed forward operator outputs the control gain corresponding to the pressure difference to the adder. The second subtractor provides the pressure difference of the target pressure and the wheel cylinder pressure to the feedback operator, and the feedback operator outputs the error compensated control gain to the adder.