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:
Sep. 29, 1998
Filed:
Apr. 30, 1996
Naoki Tomisawa, Atsugi, JP;
Satoru Watanabe, Atsugi, JP;
Unisia Jecs Corporation, Kanagawa-ken, JP;
Abstract
The present invention relates to a circuit for processing internal combustion engine crank angle sensor signals. The construction is such that an output side circuit of a crank angle sensor outputs a crank angle signal with a high level pulse generated in response to the switching on and off of a switch element connected in series to a power source. Moreover, an input side circuit of a signal processing circuit includes a voltage reducing circuit which pulls down a power source voltage applied at the time of pulse generation, to a predetermined voltage and supplies this to an arithmetic processing section. Consequently, the output signal at the time of no pulse generation becomes a low level so that influence from noise is minimized. Also, since the input signal at the time of momentary disconnection of terminals connecting between the crank angle sensor and the processing circuit is a low level, then erroneous recognition of pulse generation is prevented. Moreover, since at the time of pulse generation, current flows between the terminals, then terminal oxidation film is removed so that poor contact can also be prevented.