EGR DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent catalyst temperature drop and turbo lag when exhaust gas temperature drops with accompanying light load operation of an internal combustion engine with a supercharger.

SOLUTION: An electronic control unit 10 for EGR device closes an exhaust gas throttle valve 7 provided in a downstream of a branch part 3a from an exhaust gas passage 3 of a low pressure EGR passage 30 to control exhaust gas flow in quantity to an exhaust emission control device 8 provided in a downstream of the exhaust gas throttle valve and prevent drop of temperature of an exhaust emission control catalyst, also opens the low pressure EGR valve to perform low pressure EGR. Intake air quantity to the internal combustion engine 1 and exhaust gas flow in quantity to the supercharger are increased to prevent drop of supercharger rotation speed to prevent turbo lag.

COPYRIGHT: (C)2006,JPO&NCIPI