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. 21, 2006
Filed:
May. 09, 2001
Noboru Tokuyasu, Hitachinaka, JP;
Toshiharu Nogi, Hitachinaka, JP;
Takuya Shiraishi, Hitachinaka, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Toshiharu Nogi, Hitachinaka, JP;
Takuya Shiraishi, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention is intended to provide a control system for an direct injection internal combustion engine capable of effectively reducing the amounts of both HC and NOx exhausted from a combustion chamber during a period from the start of the engine operation to the stop of the engine operation. It comprises an external EGR passage () for returning a part of exhaust gas from an exhaust pipe () to an intake pipe (), an external EGR control valve () for controlling an amount of exhaust gas returned to the external EGR passage (), and a valve timing varying mechanism (A,B) for varying timing of opening and closing at least one of an intake valve and an exhaust valve. An ECUcontrols the valve timing varying mechanism (A,B) to always return internal EGR gas in an operation region where exhaust gas recirculation is required, and controls the external EGR control valve () to return exhaust gas in a combination of internal EGR and external EGR when an internal EGR rate provided by the valve timing varying mechanism (A,B) is not sufficient to satisfy an EGR rate demanded depending on an operation state.