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:
Jan. 07, 2003
Filed:
Aug. 30, 2001
Matsuharu Abo, Hitachinnaka, JP;
Yoshiyuki Tanabe, Hitachinaka, JP;
Koji Onishi, Hitachinaka, JP;
Toshio Ishii, Mito, JP;
Hiroshi Fujii, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The invention provide a control system for a direct fuel injection engine employing a valve varying mechanism, which can suppress mixing of burned gas and fresh air to maintain the combustion stability, can accelerate vaporization of sprayed fuel at the beginning of fuel injection to reduce the emission rate of HC, and can realize a reduction of NOx based on the effect of exhaust return. The control system for the direct fuel injection engine comprises a fuel injector. for directly injecting fuel into a combustion chamber, and valve varying drivers for variably controlling the opening/closing timing of each of an intake valve and/or an exhaust valve. A control unit controls the valve varying mechanism unit to introduce burned gas from an exhaust port into the combustion chamber and to inject the fuel during a compression stroke for effectuating stratified charge combustion. The control unit controls the valve varying drivers to provide a phase difference in the opening timing of two left and right valves constituting the intake valve and/or the exhaust valve, thereby generating a flow of the burned gas along a cylinder wall.