EGR CONTROLLER FOR INTERNAL COMBUSTION ENGINE

摘要

The quantity of EGR gas recirculated by a low-pressure EGR device is more accurately controlled. An EGR controller for internal combustion engine has an exhaust purification means (22) provided in the exhaust passage of the engine, a low-pressure EGR passage (41) for recirculating exhaust gas from the exhaust passage in the downstream of the exhaust gas purification means to the intake passage of the engine, a low-pressure EGR control valve (42) provided in the low-pressure EGR passage and controlling the quantity of exhaust gas to be recirculated, a restriction valve (43) provided in the exhaust passage connected to the low-pressure EGR passage or the intake passage connected to the low-pressure EGR passage, pressure detection means (44) for detecting the pressure between the restriction valve and the low-pressure EGR control valve, and control means (1) for controlling, based on the detected pressure, the restriction valve to form a pressure difference within a predetermined range between the upstream and downstream portions of the low-pressure EGR control valve.