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A method of determining a top dead center location of a piston in an internal combustion engine including the steps of determining a pressure versus crankshaft angle relation during a compression and an expansion portion of engine operation, defining a pressure ratio relation as the pressure at x nu

A method of determining a top dead center location of a piston in an internal combustion engine including the steps of determining a pressure versus crankshaft angle relation during a compression and an expansion portion of engine operation, defining a pressure ratio relation as the pressure at x number of degrees before a reference crankshaft angle divided by the pressure at x number of degrees after the reference crankshaft angle and shifting the pressure ratio relation a corrective number of degrees to obtain a model shape. Accordingly, the top dead center position is defined relative to the reference crankshaft angle.

대표청구항 ▼

1. A method for determining a top dead center location of a piston in an internal combustion engine, the method comprising the steps of:setting a reference crankshaft angle; determining a cylinder pressure in relation to said reference crankshaft angle during a compression stroke and an expansion st

1. A method for determining a top dead center location of a piston in an internal combustion engine, the method comprising the steps of:setting a reference crankshaft angle; determining a cylinder pressure in relation to said reference crankshaft angle during a compression stroke and an expansion stroke; defining a pressure ratio curve as a first pressure at a negative first number of degrees from said reference crankshaft angle divided by a second pressure at a positive of said first number of degrees from said reference crankshaft angle; and determining said top dead center location by shifting said cylinder pressure a corrective amount of crankshaft degrees until a shape of said pressure ratio curve conforms with a model pressure ratio curve.