Variable valve timing system and method for controlling the...

Details Variable valve timing system and method for controlling the... Variable valve timing system and method for controlling the...

2007-08-29

2010-06-22

Eshete, Zelalem (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090310

Reexamination Certificate

active

07739988

ABSTRACT:
An intake valve phase setting unit sets the target valve phase used in the variable valve timing control based on the engine operating state, and a control target value setting unit sets the control target value based on the target valve phase. An actuator operation amount setting unit prepares the rotational speed command value for an electric motor that serves as an actuator of a variable valve timing system based on the deviation of the current value from the control target value. A phase change rate control unit sets the rate of change in the valve phase to a lower value when the variable valve timing control moves the valve phase away from the reference phase (the phase when the engine is idling) at which combustion takes place stably in engine than when the variable valve timing control causes the valve phase to the reference phase.

REFERENCES:
patent: 2006/0106527 (2006-05-01), Miyakoshi et al.
patent: 4-246249 (1992-09-01), None
patent: 2002-349301 (2002-12-01), None
patent: 2004-156461 (2004-06-01), None
patent: 2005-120874 (2005-05-01), None
Machine Translation of JP2002-349301.

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