CONTROL DEVICE AND CONTROL METHOD FOR VEHICLE

摘要

A vehicle includes: an exhaust gas recirculation system in an internal combustion engine for recirculating part of exhaust gas to an intake passage of the internal combustion engine via a recirculation valve; and a cooling device for cooling recirculated gas, recirculated by the exhaust gas recirculation system, with refrigerant. An engine ECU informs a failure of the cooling device with a display unit when a cooling efficiency for cooling the recirculated gas, determined on the basis of a state value of the recirculated gas, becomes lower than a first determination value. The engine ECU additionally controls an opening degree of the recirculation valve such that an amount of the recirculated gas is reduced when the cooling efficiency for cooling the recirculated gas, determined on the basis of the state value of the recirculated gas, becomes lower than a second determination value lower than the first determination value.

主权项

1. A control device for a vehicle, comprising:
an internal combustion engine mounted on the vehicle as a power source of the vehicle; an exhaust gas recirculation system provided in the internal combustion engine, the exhaust gas recirculation system being configured to recirculate part of exhaust gas from the internal combustion engine to an intake pipe of the internal combustion engine via a recirculation valve; a cooler provided in the internal combustion engine, the cooler being configured to cool recirculated gas, recirculated by the exhaust gas recirculation system, with the use of a refrigerant; and a controller configured to calculate a cooling efficiency for cooling the recirculated gas on the basis of a state value of the recirculated gas, the controller being configured to inform a failure of the cooler when the cooling efficiency becomes lower than a first determination value, the controller being configured to control the exhaust gas recirculation system such that an amount of the recirculated gas is reduced when the cooling efficiency for cooling the recirculated gas becomes lower than a second determination value lower than the first determination value.