ENGINE DIAGNOSTIC SYSTEM AND METHOD

摘要

A diagnostic method for a reciprocating internal combustion engine is disclosed. The diagnostic method includes determining a cylinder pressure relationship between a periodic or continuous pressure of a combustion chamber of the engine and a crankshaft angle of the engine for a combustion cycle including a fuel injection. The method further includes determining a heat release rate relationship between the heat release rate in the combustion chamber and the crankshaft angle as a function of the pressure relationship. The method includes estimating an end of fuel injection crankshaft angle for the combustion cycle as a function of the first derivative of the heat release rate relationship.

主权项

1. A diagnostic method for a reciprocating internal combustion engine, comprising:
determining cylinder pressure as a function of crankshaft angle in a combustion chamber of the engine during a combustion cycle, the combustion cycle including a fuel injection event, determining a heat release rate as a function of crankshaft angle in the combustion chamber during the combustion cycle, the heat release rate determined from the cylinder pressure at a given crankshaft angle, and estimating a crankshaft angle associated with an end of the fuel injection event from the first derivative of the heat release rate in relation to the crankshaft angle.