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. 24, 2002
Filed:
Feb. 08, 2001
Toshiki Matsumoto, Kariya, JP;
Mamoru Mabuchi, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
The present invention intends to suppress torque variation caused by the change of control parameters (e.g., throttle opening degree, EGR amount, etc.) to be adjusted to maintain stable combustion conditions before and after the switching of combustion mode. To this end, in a homogeneous combustion mode, the indicated torque request is corrected based on a torque efficiency (both air-fuel ratio efficiency and ignition timing efficiency), thereby correcting a target air amount in accordance with the corrected indicated torque request. Furthermore, in a stratified combustion mode, the indicated torque request is corrected based on a torque efficiency (only air-fuel ratio efficiency), thereby correcting a target fuel amount in accordance with the corrected indicated torque request. Furthermore, in the homogeneous combustion mode, it is possible to suppress the torque variation by performing ignition timing correction in addition to the target air amount correction.