Patent ID: 6250291
Filing Date: 2001-06-26
Classification: F02D,Y02T

Abstract:
A process for controlling an internal combustion engine with an exhaust circuit, an oxygen probe in the exhaust circuit, and an exhaust gas recirculation device with a recirculation valve and a device for regulating an air/fuel mixture injection into an inlet circuit as a function of a signal of the oxygen probe, the method which comprises:synchronizing a control of the recirculation valve with a transition of a correction of a richness of the air/fuel mixture;opening the recirculation valve in a first time window, and defining a start and an end of the first time window such that an actual opening of the valve, defined by an increase above a predetermined threshold in an inlet pressure at an inlet to an engine cylinder as a result of the opening of the valve, occurs during a phase wherein the air/fuel mixture is enriched; andclosing the recirculation valve during a phase wherein the air/fuel mixture becomes more lean.