Exhaust gas recirculation (EGR) internal combustion engine roughness control system

摘要

A closed loop internal combustion engine control system is provided for controlling the exhaust gas recirculation flow of an internal combustion engine so as to regulate engine roughness at a predetermined level. The control system receives an input signal indicative of the engine roughness and generates therefrom an EGR valve command signal for varying the position of a variable position EGR servo-valve so as to effect the maximum possible EGR flow compatible with a predetermined maximum level of engine roughness.