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. 05, 1988
Filed:
Sep. 03, 1986
Tetsuro Takaba, Hiroshima, JP;
Tomotsugu Rikitake, Hiroshima, JP;
Yoshitaka Tabara, Hiroshima, JP;
Manabu Arima, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An ignition timing correcting circuit which retards ignition timing when knock occurs and advances ignition timing when knock does not occur. An optimal ignition timing on which the ignition timing is to be converged is set to a latest ignition timing to which the ignition time can be retarded without raising the exhaust gas temperature higher than a predetermined value at the actual air-fuel ratio at that time. The actual ignition timing corrected by the ignition timing correcting circuit is compared with the optimal ignition timing. An air-fuel ratio control circuit corrects the air-fuel ratio toward the lean side when the actual ignition timing is on the advance side of the optimal ignition timing and toward the rich side when the former is on the retard side of the latter.