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:
Sep. 14, 1999
Filed:
Jul. 30, 1997
Applicant:
Inventors:
Hirohito Matui, Okazaki, JP;
Mitsuo Inagaki, Okazaki, JP;
Assignee:
Nippon Soken, Inc., Nishio, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01L / ;
U.S. Cl.
CPC ...
73862194 ;
Abstract
An alternator provides its output current waveform directly or via a current probe to a low pass filter and a high pass filter. The resulting waveform is provided to a half-wave rectifier and a comparator to obtain a rectangular waveform. The arithmetic circuit determines the number of clock pulses between rectangular waves to obtain the rotation speed of the alternator. The torque due to auxiliary devices is computed based on the ratio of the rotation speed of a crankshaft to the rotation speed of the alternator.