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. 16, 1997
Filed:
Feb. 21, 1996
Naoki Tomisawa, Atsugi, JP;
Unisia Jecs Corporation, Kanagawa-ken, JP;
Abstract
Combustion pressure is detected using a cylinder pressure sensor, and a crank angle position corresponding to a centroid of combustion during a combustion period is obtained as a combustion centroid position, based on the detected combustion pressure. Combustion conditions are then detected based on the detected combustion centroid position. On the other hand, depending on operating conditions, a crank angle position corresponding to a centroid of combustion during a combustion period for the case where desired combustion conditions are obtained, is set as a target centroid position, and an engine control quantity then feedback controlled so that the combustion centroid position becomes the target centroid position. In this way, combustion conditions of an internal combustion engine can be detected to a higher accuracy than with conventional arrangements wherein combustion conditions are detected based on fluctuations in an indicated mean effective pressure and the like, which shows only a comparatively small change with changes in combustion conditions. Moreover if engine control is carried out with the combustion centroid position as an index, then engine control accuracy can be significantly improved.