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:
Feb. 24, 1981
Filed:
Jul. 10, 1979
Hideaki Norimatsu, Toyohashi, JP;
Sigenori Isomura, Kariva, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An air-fuel ratio control system comprises a comparator circuit for comparing a predetermined reference level with an output signal of a first oxygen sensor disposed upstream of a three-way catalyst for purifying the exhaust gas in the exhaust system of an internal combustion engine, the comparator circuit producing a signal indicative of whether the output signal of the first oxygen sensor is higher (lean) or lower (rich) than a predetermined air-fuel ratio, a delay circuit for delaying at least one of the output signals of the comparator circuit, and a delay time adjusting circuit for adjusting the delay time of the signal delayed by the delay circuit, in accordance with the value of the output signal of a second oxygen sensor disposed downstream of the three-way catalyst.