Method of correcting operating set points of internal combustion engine

Abstract

A method of correcting operating set points of an internal combustion engine is disclosed. The method includes predetermining an oxygen sensor time correction factor representative of a delay between a combustion event of a fuel quantity injected into a cylinder of the engine and a measurement in the exhaust pipe of an air-to-fuel ratio produced by said combustion event; calculating a fuel injection error quantity as a difference between a nominal fuel quantity and an estimated fuel quantity injected into the cylinder, the nominal fuel quantity being determined for an injection that precedes the measurement of an air-to-fuel ratio value by the oxygen sensor time correction factor, the estimated fuel quantity being determined as a function of an air mass flow value and of the measured air-to-fuel ratio value; and correcting the operating set points of the internal combustion engine using the calculated fuel injection error quantity.

Description

technical field [0001] The present disclosure relates to a method of calibrating the operating set point of an internal combustion engine Background technique [0002] Internal combustion engines for motor vehicles typically include an engine block defining at least one cylinder housing a reciprocating piston coupled to rotate a crankshaft. The cylinders are closed by a cylinder head which cooperates with a reciprocating piston to define a combustion chamber. A mixture of fuel and air is cyclically disposed within the combustion chamber and ignited, thereby producing thermally expanding exhaust gases that cause reciprocating motion of the piston. Fuel is injected into each cylinder through each cylinder's respective fuel injector. Fuel is provided to each fuel injector at high pressure from a fuel rail in fluid communication with a high pressure fuel pump that increases the pressure of fuel received from a fuel source. [0003] A fuel injection system typically includes a...

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Problems solved by technology

[0019] However, in case the FSA strategy is used to detect faults on the fuel injection system, because of the fact that the FSA strategy should be able to identify injector excursions and compensate the system in a fast manner and within a limited number of drive cycles, the current strategy performance may not be enough

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