Patent ID: 6311679
Filing Date: 2001-11-06
Classification: F02B,F02D,Y02T

Abstract:
A method of controlling air charge in a direct-injection, spark-ignition engine having an exhaust gas recirculation (EGR) valve connecting the exhaust manifold and intake manifold of the engine, and an electronically controlled throttle (ETC) valve controlling air flow from the atmosphere to the intake manifold of said engine, comprising a sequence of the following steps:generating an intake manifold pressure value which is indicative of measured intake manifold pressure;determining a desired intake manifold pressure value;determining a desired EGR valve position;determining a desired ETC valve position;adjusting said ETC valve position in accordance with said desired ETC valve position; andadjusting EGR valve position by an amount that is proportional to the error and the time integral of the error between said actual intake pressure value and said desired intake pressure value.