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. 21, 1997
Filed:
Mar. 23, 1995
Hiroshi Kitagawa, Wako, JP;
Seiji Hatcho, Wako, JP;
Tetsuya Kaneko, Wako, JP;
Akira Kato, Wako, JP;
Toshiaki Hirota, Wako, JP;
Masami Watanabe, Wako, JP;
Jun Takahashi, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An air-fuel ratio control system for an internal combustion engine has a catalytic converter arranged in an exhaust passage. A maximum oxygen storage amount indicative of the maximum amount of oxygen that can be stored in the catalytic converter is calculated. The air-fuel ratio of a mixture supplied to the engine is forcibly oscillated at a predetermined frequency and a predetermined amplitude. At least one of the predetermined frequency and the predetermined amplitude is changed at a predetermined rate of change. A predetermined rate of change of the at least one of the predetermined frequency and the predetermined amplitude is set in dependence on the maximum oxygen storage amount to thereby secure the maximum purification rate of the catalytic converter.