Engine valve characteristic controller
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United States of America Patent
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-
May 13, 2003
Grant Date -
N/A
app pub date -
Feb 5, 2002
filing date -
Aug 23, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The cam face of an intake cam has a main lift portion, which causes an intake valve to execute a basic lift operation, and a sub lift portion, which assists the action of the main lift portion. The main lift portion and the sub lift portion continuously change in an axial direction of the intake cam. An axial movement mechanism moves the intake cam in the axial direction to adjust the axial position of the cam face that drives the intake valve. The axial movement of the intake cam results in the valve being given a variety of valve lift characteristics in the form of a combination of a cam lift pattern realized by the main lift portion and a cam lift pattern realized by the sub lift portion. Therefore, various engine performances required according to the running conditions of the engine can be fully satisfied by the valve characteristics.
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