Patent ID: 9200555
Filing Date: 2015-12-01
Classification: F01N,Y02T

Abstract:
1. A control device for an electrically heated catalyst provided in an exhaust gas passage of an internal combustion engine, an air-fuel ratio of the internal combustion engine being controlled at a ratio near a theoretical air-fuel ratio at an operation time, the electrically heated catalyst including a heating element that is heated by electric conduction to heat the catalyst by the heating, a case that stores the heating element therein and an insulating member provided between the heating element and the case to insulate electricity, the control device for an electrically heated catalyst comprising: an electric conduction control unit configured to electrically conduct the heating element after an operation of the internal combustion engine is stopped and when a temperature of the electrically heated catalyst or a temperature of an exhaust gas correlated with the temperature of the electrically heated catalyst when the operation of the internal combustion engine is stopped is equal to or higher than a first predetermined temperature, the electric conduction control unit configured to either inhibit electric conduction to the heating element or electrically conduct the heating element after a predetermined electric conduction stop period elapses from when the operation of the internal combustion engine is stopped, wherein when the temperature of the electrically heated catalyst or the temperature of the exhaust gas correlated with the temperature of the electrically heated catalyst when the operation of the internal combustion engine is stopped is equal to or lower than a second predetermined temperature, the electric conduction control unit inhibits electric conduction to the heating element.