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:
Nov. 03, 1987
Filed:
Mar. 05, 1986
Honda Giken Kogyo K.K., Tokyo, JP;
Abstract
An ignition timing control method for an internal combustion engine having a catalytic exhaust emission purifier for scrubbing toxic exhaust gas components from engine exhaust gases by means of a catalyst, wherein the timing at which a mixture in the engine is ignited is controlled on the basis of an ignition timing set in dependence upon operating parameters of the engine. The method comprises the steps of sensing temperature of the engine after the engine is started, sensing elapsed time from the moment the engine is started when the sensed temperature lies within a predetermined temperature range, setting a delay angle correction amount in dependence upon the sensed elapsed time, correcting the ignition timing by the set delay angle correction amount, and controlling the ignition timing in accordance with the ignition timing so corrected. Preferably, the correction of the ignition timing is effected only when a particular operating condition of the engine is sensed.