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. 08, 2005
Filed:
Jan. 14, 2004
Hatsuo Nagaishi, Yokohama, JP;
Takashi Nakazawa, Kawasaki, JP;
Takeshi Etou, Chigasaki, JP;
Takahisa Koseki, Yokohama, JP;
Hatsuo Nagaishi, Yokohama, JP;
Takashi Nakazawa, Kawasaki, JP;
Takeshi Etou, Chigasaki, JP;
Takahisa Koseki, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A controller () of a knocking index value calculation device in a spark ignition engine () determines operating conditions of the engine (), estimates an in-cylinder pressure at a reference crank angle, which is set at a predetermined crank position after compression top dead center, using these operating conditions, estimates a temperature of unburned gas in the cylinder at the reference crank angle using these operating conditions, and calculates a knocking index value using the in-cylinder pressure and unburned gas temperature.