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:
May. 01, 2001
Filed:
Apr. 26, 1999
Kazumasa Ito, Shizuoka, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka, JP;
Abstract
An engine control system quantifies engine acceleration advances ignition timing in accordance with the quantified engine acceleration. The control system includes a controller that receives signals indicative of engine speed and crankshaft angle and periodically determines whether the engine acceleration falls into one of four quantified ranges of acceleration: a rapid acceleration range, a moderate acceleration range, a gradual acceleration range; and a range of de minimis acceleration (i.e., substantially no acceleration). The controller then adjusts ignition timing according to engine speed and to the particular acceleration range. In doing so, the controller determines a desired ignition timing by referencing ignition timing maps stored in the memory of the control system. Each map corresponds to one of the acceleration ranges. By quantifying acceleration into several ranges, the controller can better tailor ignition timing to optimize engine performance and provide smoother acceleration, regardless of the degree of acceleration. The ride of the watercraft during accelerations consequently improves.