Patent ID: 7178493
Filing Date: 2007-02-20
Classification: F01L,F02D,Y02T

Abstract:
1. Method to determine a crank angle at which to initiate engine valve opening into a cylinder having a reciprocating piston, said piston attached to a rotating crankshaft, comprising: determining a desired valve lift, and, a duration of valve open time; estimating an opening profile for the engine valve, based upon the desired valve lift, and, the duration of valve open time; determining a first crank angle, based upon the estimated opening profile for the engine valve, a cylinder diameter, and, a cylinder displacement; determining a second crank angle, based upon the first crank angle, a linear position of the piston determined when the crankshaft is at the first crank angle, and, the estimated opening profile for the engine valve; and, offsetting the second crank angle by a safety margin.