Patent ID: 7681560
Filing Date: 2010-03-23
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. An exhaust gas recirculation system for an engine, comprising: an exhaust gas recirculation path for establishing communication between an exhaust path and an intake path of an engine and recirculating part of exhaust gas back into the intake path; exhaust gas flow rate detection means for detecting the rate of an exhaust gas flow in the exhaust recirculation path; an exhaust gas flow control valve for controlling the rate of an exhaust gas flow in the exhaust recirculation path; and a catalyst that is installed upstream of the exhaust gas flow rate detection means to purify soiling substances in the exhaust gas, wherein the operating status of the exhaust gas flow rate detection means is controlled while using a signal in accordance with the conditions of the catalyst as one input.