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:
Jun. 19, 1990
Filed:
Aug. 29, 1988
Terufumi Hidaka, Kanagawa, JP;
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
A spark advance control system includes a high octane value spark advance schedule and a regular octane value spark advance schedule, respectively including advance limits and retard limits at different spark advance angles. Spark advance control schedules are selected during normal spark advance control operation. The high octane value spark advance schedule is selected when spark advance is maintained at an angular value higher than a predetermined regular-to-high octane value schedule switching, which is set near an advance limit in the regular octane value spark advance schedule. In the alternative, the regular octane value spark advance schedule is selected when spark advance is maintained at an angular value lower than a predetermined high-to-regular octane value schedule switching criterion, which is set near the retard limit in the high octane value spark advance schedule. The spark advance control schedule selection set forth above successfully avoids uncomfortably rapid and substantial changes of engine output characteristics, even when the gasoline type is changed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile