Valve timing control system for internal combustion engine

Details Valve timing control system for internal combustion engine Valve timing control system for internal combustion engine

2006-01-31

2006-01-31

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S568110

Reexamination Certificate

active

06990939

ABSTRACT:
There is provided a valve timing control system for an internal combustion engine, which makes it possible to secure a right amount of combustion gases in a combustion chamber, irrespective of whether an EGR device is in operation or not, thereby obtaining a sufficient effect of reduced exhaust emissions by reduction of NOx. A crank angle position sensor and an intake pipe absolute pressure sensor detect operating conditions of the engine. An ECU determines whether the EGR device is in operation or not. A target cam phase is set in dependence on the detected operating conditions of the engine and a result of the determination as to whether the EGR device is in operation or not, and the cam phase is controlled to the target cam phase.

REFERENCES:
patent: 5666931 (1997-09-01), Pierik et al.
patent: 6484676 (2002-11-01), Shimizu et al.
patent: 6656089 (2003-12-01), Furukawa
patent: 6766775 (2004-07-01), Riedle et al.

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