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. 11, 1992
Filed:
Apr. 13, 1990
Takashi Matsuura, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
There is disclosed a knocking detection device for an automotive engine mounted on a vehicle and having a knock sensor for detecting analog vibration waveforms of the engine, and a crank position sensor for producing signals corresponding to a predetermined crank angle of the engine. The device comprises a first calculating circuit responsive to the signals from the crank position sensor for calculating an engine speed of the engine; a first setting circuit for setting a knocking detection term in one cycle of the engine corresponding to a period having the possibility of knocking; a conversion circuit for converting analog waveforms detected by the knock sensor into digital data every sampling period; a second calculating circuit for calculating a knocking level of the engine based on an average value of the digital data from the conversion circuit during the knocking detection term set by the first setting circuit; a second setting circuit responsive to the engine speed calculated by the first calculating circuit for setting a discrimination level; and a determination circuit for determining an occurrence of knocking by comparing the knocking level output from the second calculating circuit with the discrimination level set by the second setting circuit.