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. 18, 1993
Filed:
May. 11, 1992
Seiichi Sato, Tokyo, JP;
Kazuo Yamaguchi, Tokyo, JP;
Yoshi Kurosawa, Tokyo, JP;
Atsushi Ueda, Hyogo, JP;
Masami Matsumura, Hyogo, JP;
Optec D.D. Meico Laboratory Co., Ltd., Tokyo, JP;
Optec Dai-Ichi Denko Co., Ltd., Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An automotive engine control system is provided for an automobile having a variable rotation speed engine which has a plurality of spark plugs served by respective spark plugs. The system includes an optical rotary encoder having a rotatable pulse scale having a row of code pattern with specific light-permeable or light-deflection slits each for outputting a reference position signal and other light-permeable or light-reflection slits each adapted to reduce the amount of light for outputting an angular signal, both of the optical signals being photoelectronically converted and the waveform of the resultant electric signals being shaped based on threshold voltages into electric pulse signals indicative of a reference angle of 0.degree. and the accumulated angle of rotation, in which the circumferential width of each specific reference slit is made narrower than that of other slit so that the pulse width for angular position-indicating of the angular pulse signal is always equal and constant for ensuring more accurate detection of the angle of rotation. As the engine rotation speed is sensed to speed up and slow down, by a sensor that is operatively connected with the engine, the optical rotary encoder varies igniting of the spark plugs.