Patent ID: 6971348
Filing Date: 2005-12-06
Classification: F01L

Abstract:
1. A method for controlling operation of an engine valve during both steady state and varying speed operation of an engine, the method comprising the steps of: 1a) prior to step during a valve closed dwell period, estimating the timing for the next valve opening step; and confirming reaching of the valve opening time; 1) at the predetermined valve opening time relating to engine speed, performing valve opening along a predetermined time invariant opening profile; 2) holding the valve open at a selected valve lift for a variable time period relating to engine speed; 3a) prior to step estimating the timing for the next valve closing step; and confirming reaching of the valve closing time; 3) at the predetermined valve closing time relating to engine speed, performing valve closing along a predetermined time invariant closing profile; 4) holding the valve closed for a variable estimated time period relating to engine speed; and repeating steps