ABNORMALITY DIAGNOSIS DEVICE FOR EXHAUST GAS RECIRCULATION DEVICE

摘要

An abnormality diagnosis device for an exhaust gas recirculation device in an internal combustion engine is provided. The exhaust gas recirculation device has an exhaust gas recirculation valve that adjusts the amount of recirculation exhausts gas returned from an exhaust passage to an intake passage of the engine. The abnormality diagnosis device includes a control section that changes the exhaust gas recirculation valve to diagnose an abnormality in the exhaust gas recirculation device. When the abnormality diagnosis execution condition is met, the control section, prior to the execution of the valve closing operation, inhibits the opening degree adjustment and executes a valve opening process to increase the opening degree of the valve from the opening degree at the time to a second target opening degree greater than the first target opening degree.