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. 24, 1991
Filed:
Apr. 19, 1990
Hisashi Mitsumoto, Kanagawa, JP;
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
A system and method for controlling ignition timing for a lean burn type internal combustion engine in which alcohol is mixed with gasoline. A final ignition timing value ADV is determined from a basic ignition timing value BASE, a feedback correction quantity .DELTA..sub.1, plus a second correction quantity .DELTA..sub.2, the basic ignition timing value being derived for conventional fuel (gasoline) on the basis of the operating conditions of an engine having a driving region in which the engine is driven with a lean air/fuel mixture ratio. The second correction quantity, .DELTA..sub.2, is derived according to an estimated value of a percentage R of mixture of an alternative fuel (alcohol) to the conventional fuel (gasoline).