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:
Aug. 04, 1987
Filed:
Dec. 26, 1984
Toshihiro Hattori, Ayase, JP;
Katsuya Shishido, Fujisawa, JP;
Hitoshi Kasai, Kawasaki, JP;
Shigeki Moride, Yokosuka, JP;
Noriaki Ogawa, Tokyo, JP;
Isuzu Motors Limited, Tokyo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Herein disclosed is a revolution signal processing system for an electronic controller to ensure safe operation of a vehicle having an automatic transmission. The system includes: an input shaft revolution sensor for outputting an input shaft r.p.m. signal; a vehicle speed sensor for outputting a vehicle speed signal; signal processors for determining the r.p.m.'s of the two sensors in response to the two output signals of the same; a gear position sensor for outputting a gear position signal; a gear position detector for detecting the gear position of the automatic transmission; and a self-testing backup. When the gear position detector detects that the transmission is in a gear position other than the neutral position, and if one of the output signals of the two sensors exhibits an r.p.m. equal to or higher than a predetermined value, whereas the other of the same exhibits an abnormally lower value or an r.p.m. lower than the predetermined value, then the self-testing back up determines that the sensor having the output signal exhibiting the abnormally low value is malfunctioning. Thus, the revolution signal processing system self-tests and backs up the vehicle speed sensor and the input shaft revolution sensor.