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:
Mar. 07, 1995
Filed:
Jul. 27, 1993
Applicant:
Inventors:
Toshiaki Kikuchi, Okazaki, JP;
Shosuke Suzuki, Okazaki, JP;
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
123339 ; 36443105 ;
Abstract
A throttle control system reliably determines failure of a throttle valve driving system. During engine idling, a throttle valve is opened and closed by an actuator. A central processing unit generates a pulse-like drive signal to the actuator through a back-up integrated circuit. When the frequency of the drive signal exceeds a predetermined value, the back-up integrated circuit determines that a failure in the central processing unit has occurred. Since this determination is based on the frequency of the drive signal, a driving system failure can be reliably detected even using pulse-like signals.