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:
Feb. 02, 1999
Filed:
Aug. 12, 1996
Takayoshi Honda, Nagoya, JP;
Takahiko Hasegawa, Nukata-gun, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An A/D-converter for a knock determination of an engine performs A/D-conversion with respect to a knock signal having a reference voltage and to another sensor signal having a reference voltage that differs therefrom. When the engine rotation is less than 1000 rpm, since the knock signal is too small to perform malfunction determination, integration of '0' point data (reference voltage: 2.5V) of an integrating circuit is performed within a knock determination time period. The resulting data is A/D-converted by the A/D-converter to thereby update the '0' point value stored in a RAM. On the other hand, in a range of greater than 1000 rpm where malfunction determination can be performed of the knock sensors, within the knock determination time period, the knock signal is integrated using the integrating circuit.