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:
Sep. 22, 1987
Filed:
Sep. 17, 1986
Fumio Yatabe, Wako, JP;
Yoshio Wazaki, Wako, JP;
Honda Giken Kogyo K.K., Tokyo, JP;
Abstract
A method of effecting feedback control of the air-fuel ratio of an air-fuel mixture being supplied to an internal combustion engine, by correcting a basic fuel supply quantity by the use of a correction coefficient variable in response to the output of an exhaust gas ingredient concentration sensor. An engine low-load operating region is defined by at least one parameter representing load on the engine. When the engine enters the low-load operating region, a value of the correction coefficient is determined in response to an output from the above sensor and also an average value of values of the correction coefficient thus determined is calculated for a predetermined time period after the engine enters the low-load operating region. A target value of the correction coefficient is calculated on the basis of the average value obtained, the target value yielding a predetermined air-fuel ratio higher than a stoichiometric mixture ratio. The value of the correction coefficient is varied after the lapse of the predetermined time period and until it becomes equal to the target value while the engine remains in the low-load operating region. The basic fuel supply quantity is corrected by the use of the value of the correction coefficient thus varied.