The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2007
Filed:
Jun. 01, 2005
Kunihiro Abe, Tokyo, JP;
Kunihiro Abe, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
It is an object to provide an electric heated catalyst failure diagnostic device that is compact, lightweight, inexpensive, and can accurately detect a disconnection of the heater and an abnormality in a circuit from the power supply to the heater with a simple configuration. When an ECU orders to apply the current to a heater drive circuit, a heater failure diagnostic device applies the current to the heater and the heater drive circuit. If energizing via a diode, the heater failure diagnostic device determines the circuit is abnormal. If not so, the circuit is normal. Meanwhile, when the ECU orders not to apply the current to the heater drive circuit, the heater failure diagnostic device turns on electricity to the heater and the heater drive circuit. If energizing via the diode, the heater failure diagnostic device determines the heater is not disconnected, and if not so, the heater is disconnected.