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:
May. 17, 1994
Filed:
Dec. 18, 1991
Yasunori Iwakiri, Kanagawa, JP;
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
This invention relates to an engine knocking detector for determining knocking intensity from the oscillation waveform of the cylinder internal pressure. The total amount of heat generated in the combustion chamber during one revolution of the crankshaft is computed from the pressure waveform from which high frequency components have been eliminated, and from the running state of the engine. Also, the knocking start point during one revolution of the crankshaft is determined by comparing high frequency components extracted from the waveform and a predetermined reference value, and the amount of heat due to knocking is computed. A knocking intensity is then determined by comparing these two amounts of heat. By detecting knocking based on this comparison of amounts of heat generated in the combustion chamber, the knocking can be detected with high precision by means of a common logic irrespective of engine differences, installation positions of cylinder internal pressure sensors and individual sensor differences.