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:
Oct. 18, 1983
Filed:
Jun. 13, 1980
Masaharu Asano, Yokosuka, JP;
Nissan Motor Company, Ltd., Yokohama, JP;
Abstract
A first circuit is provided for producing an output which changes at a certain rate by an amount corresponding to a predetermined crank angle in the direction of retarding a spark timing each time a knocking determination signal, representing that knocking occurs, is inputted thereto with a frequency higher than a predetermined frequency and an amplitude larger than a predetermined amplitude. The output from the first circuit further changes at a smaller rate than said certain rate in the direction of advancing the spark timing in the absence of the knocking determination signal. A second circuit is provided for outputting a waveform which is reset each time a spark command signal is inputted thereto and which thereafter changes to a predetermined level at a rate depending upon the rotational speed of the engine. A third circuit is provided for comparing the outputs of the first and second circuits to output a pulse signal of a duration depending upon the level of the output of the first circuit. A fourth circuit means is provided for retarding the spark timing by an amount corresponding to the duration of the pulse signal.