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:
Oct. 30, 1990
Filed:
Mar. 28, 1989
Yoshihisa Kawamura, Kanagawa, JP;
Abstract
A system and method for controlling an ignition timing for a vehicular internal combustion engine are disclosed in which a feedback correction quantity for the ignition timing value is calculated on the basis of a result of detection of at least one of an occurrence of engine knocking and a position at which a combustion pressure becomes maximum and the feedback correction quantity is added to a basic ignition timing angle value based on engine operating conditions to determine a final ignition timing angle value. The feedback correction quantity is limited by a limit value set so as to be varied with the increase of a vehicle speed when the feedback correction quantity is advanced toward an advance angle value. The limit value is retarded when the vehicle speed is low, thus suppressing a combustion noise. On the other hand, the limit value is advanced when the vehicle speed is high, thus achieving the engine output torque and fuel economy.