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:
Jan. 11, 2005
Filed:
Oct. 22, 2002
Michiyasu Takahashi, Shizuoka, JP;
Hitoshi Hasegawa, Shizuoka, JP;
Yuichiro Sawada, Shizuoka, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka, JP;
Abstract
To accurately detect occurrence of erroneous detection of a crank pulse associated with dropout of a crank pulse or occurrence of noise. A cogless section is provided in cogs provided on an outer periphery of a crankshaft for transmitting a crank pulse. Occurrence of erroneous detection of a crank pulse is detected through use of an instantaneous rotational speed of the crankshaft computed from a crank pulse assigned to the cogless section and crank pulses assigned to cogs before and after the cogless section. When too few crank pulses are detected, a rapid increases arises in the instantaneous rotational speed of the crankshaft computed from the crank pulses after occurrence of a rapid decrease. The number of detected cramp pulses—which are fewer than the original crank pulses—is detected from the number of crank pulses existing between occurrence of a rapid decrease and occurrence of a rapid increase. When a too many crank pulses are detected, a rapid decrease arises in the instantaneous rotational speed of the crankshaft after occurrence of a rapid increase. The number of detected crank pulses—which are greater in number than the original crank pulses—is detected from the number of crank pulses existing between occurrence of a rapid increase and occurrence of a rapid decrease.