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:
Jul. 15, 1986
Filed:
Oct. 30, 1984
Nippon Soken, Inc., Nishio, JP;
Abstract
A motor speed controlling device comprises a rotating shaft connected to an axle and having rotation speed (set speed) varying with the passage of time, a motor with an output shaft connected to a pointer of a speedometer by means of an eddy-current coupling, rotation detectors generating pulse signals respectively proportional to the rotation speed in the rotating shaft and the output shaft and having the same frequency and the same pulse width at the same rotation speed, a logical operation circuit for discriminating the binary state of both pulse signals, and an integrating circuit which increases driving signal to the motor at a definite gradient when one pulse signal is in the 1 state and the other pulse signal is in the 0 state and decreases the driving signal at a definite gradient when one pulse signal is in the 0 state and other pulse signal is in the 1 state and holds the driving signal to the constant value when both pulse signals are at the same level. The rotation speed of the motor accurately follows the set speed according to the driving signal varying as above described and the speedometer pointer connected through the eddy-current coupling to the motor indicates the vehicle speed.