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:
Jan. 18, 1994
Filed:
Oct. 06, 1992
Yasuhiro Shimizu, Aichi, JP;
Nobuyuki Kobayashi, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A device for determining a deterioration of a catalytic converter for an engine equipped with a catalytic converter disposed in the exhaust passage and upstream and downstream air-fuel ratio sensors disposed in the exhaust passage upstream and downstream of the catalytic converter, respectively, wherein the device calculates the lengths of the output response curves of the upstream and downstream air-fuel ratio sensors LVOM and LVOS, respectively, and the areas surrounded by the output response curves and a reference voltage line of the upstream and downstream air-fuel ratio sensors AVOM and AVOS, respectively, the device determining whether or not the catalyst is deteriorated in accordance with the relationship between the ratio LVOS/LVOM and the ratio AVOS/AVOM.