CONTROL APPARATUS AND CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

An ECU opens/closes an EGR valve (43) at a predetermined time (PI) to start blockage detection of an exhaust gas recirculation passage, increases an opening degree of a throttle valve (25) after start of the blockage detection over an opening degree immediately before the start of the blockage detection, and detects a blocking amount of the exhaust gas recirculation passage based on a change amount (&Dgr;GN) in an internal pressure detected by a pressure sensor, which is a difference between the internal pressure detected when the EGR valve is opened and the internal pressure detected when the EGR valve is closed.