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:
Dec. 31, 2019
Filed:
Feb. 17, 2014
Nissan Motor Co., Ltd., Yokohama-shi, Kanagawa, JP;
Taisuke Shiraishi, Kanagawa, JP;
NISSAN MOTOR CO., LTD., Yokohama-shi, Kanagawa, JP;
Abstract
In determining an in-cylinder pressure by analyzing a secondary current detected by a secondary current detection resistor, an engine controller is configured to detect an engine revolution speed and a discharge duration during which the secondary current flows. The discharge duration is correlated with a gas pressure between electrodes of a spark plug at ignition timing, that is, an in-cylinder pressure, and is different depending on the engine revolution speed. The engine controller is further configured to estimate the in-cylinder pressure at ignition timing based on the engine revolution speed and the discharge duration. An amount of time-dependent change in mechanical compression ratio, caused by accumulation of deposits, is detected based on the estimated in-cylinder pressure at ignition timing.