Patent ID: 7124751
Filing Date: 2006-10-24
Classification: F02D,F02M,Y02T

Abstract:
1. A position control system for an EGR valve that includes a solenoid actuator, the position control system comprising: a desired EGR valve position module that calculates a desired EGR valve position; an actual EGR valve position module that communicates with the EGR valve and calculates an actual EGR valve position; an EGR valve pressure change module that determines a pressure change across the EGR valve; a first lookup table that communicates with the EGR valve position module and determines a first duty cycle control term indicative of the desired EGR valve position; a second lookup table that communicates with the EGR valve pressure change module and determines a second duty cycle control term indicative of the pressure change; and a control module that communicates with the desired EGR valve position module, the actual EGR valve position module, and the first and second lookup tables, wherein the control module generates an error signal based on the desired EGR valve position and the actual EGR valve position, calculates at least one third duty cycle control term based on the error signal, and controls a duty cycle of the solenoid actuator according to the first, second, and third duty cycle control terms.