Patent Document ID: 20100319664
Application ID: 12517866
Patent Flag: 0

Claim One:
1. An EGR valve control system used in an exhaust gas recirculation system taking out part of exhaust gas from an exhaust system and circulating the part to an intake system, the EGR valve control system comprising: a motor exercising opening and closing control of an EGR valve; a sensor detecting an actual position of the EGR valve; and a motor control apparatus computing a drive duty of the motor based on a target position of the EGR valve and the actual position thereof detected by the sensor, wherein the motor control apparatus exercises the opening and closing control of the EGR valve by computing, when a target position of the EGR valve is set, an integral term based on the deviation between the target position of the EGR valve and the actual position thereof, a proportional term and a derivative term based on the change of the actual position of the EGR valve, and a feedforward term based on the change of the target position, respectively, and further calculating a drive duty of the motor by performing addition and subtraction on the above-computed integral term, proportional term, derivative term, and feedforward term.