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. 18, 1988
Filed:
Jan. 23, 1987
Nissan Motor Company, Limited, Kanagawa, JP;
Abstract
A system and method for controlling ignition timing of an internal combustion engine controls the ignition timing in accordance with the measured intensity of knocking when such occurs. The system corrects the ignition timing by a retardation amount related to the intensity of knocking. The system monitors engine vibration over a period in which knocking cannot occur and over the period after TDC in which knocking may occur and compares the vibration intensity levels to produce a statistical measure of knocking intensity. If the measured intensity reflects a high probability of severe knocking, ignition is retarded immediation to an extent related to the measured intensity. If knocking is absent to a high probability, ignition timing is advanced to a fixed extent. When only light knocking is detected, the measured intensity is monitored over numerous ignition cycles until the cumulative intensity level reflects a high probability either of desirable trace knocking or moderately disruptive knocking. In the latter case, ignition is retarded to a fixed extent.