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. 26, 1988
Filed:
Dec. 01, 1986
Kazuhisa Sawada, Owariasahi, JP;
Tatsuo Teratani, Aichi, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
Provided is an abnormality determination device for a vehicle speed sensor which can prevent a memory unit from storing the erroneous result of abnormality determination of a vehicle speed sensor due to the engine racing when the vehicle is stationary. The device of the invention includes a revolution speed sensor for detecting a revolution speed of an output shaft of an automatic transmission and generating a speed signal, abnormality determination elements for inputting the speed signal of the revolution speed sensor and for determining if the revolution speed sensor is abnormal and for generating an abnormality signal in response to the determined result, a memory for storing the abnormality signal, and halt elements for preventing the memory from storing the abnormality signal when the automatic transmission is set at a neutral position or at a parking position.