Patent ID: 7284365
Filing Date: 2007-10-23
Classification: F01N,Y02T

Abstract:
1. An electric heated catalyst failure diagnostic device comprising: an electric heated catalyst having a heater and being disposed in an engine exhaust system to which electricity is supplied by a power supply; control means, the control means controlling energizing of the heater of the electric heated catalyst; heater abnormality detecting means for detecting first and second heater abnormalities, the detecting means detecting a second abnormality that is a disconnection abnormality of the heater when the control means issues a command not to energize the heater; and a heater energize command detector for detecting the command from the control means not to energize the heater, wherein the heater abnormality detecting means is activated when the heater energizing command detector detects the command from the control means not to energize the heater.