Method of feedforward controlling a multi-cylinder internal combustion engine and associated feedforward fuel injection control system
AssigneeSTMicroelectronics S.r.l.
InventorsFerdinando Taglialatela-Scafati, Nicola Cesario, Francesco Carpentieri
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Abstract
The amount of fuel to be injected in each cylinder of a multi-cylinder spark ignition internal combustion engine may be determined with enhanced precision if the fuel injection durations are determined as a function of the sensed mass air flow in all the cylinders of the engine, instead of considering only the air flow in the same cylinder. This finding has led to the realization of a more efficient method of controlling a multi-cylinder spark ignition internal combustion engine and a feedforward control system.
Claims7
A feedforward control system of a multi-cylinder internal combustion engine generating feedforward signals representing durations of fuel injection (IFF) of each cylinder of the engine, comprising:
- a plurality of mass air flow physical sensors or estimators each generating a mass air flow signal (MAF1, . . . , MAFN) representative of the intake mass air flow of a respective cylinder of said engine,
- a single logic unit (N INJECTION CONTROL MAP) input with all said mass air flow signals (MAF1, . . . , MAFN), generating said feedforward signals the level of which corresponds to the level established by a look-up table stored therein in correspondence of the current speed of the engine and of the current values of all said mass air flow signals.
A method of feedforward controlling a multi-cylinder internal combustion engine by generating feedforward signals representing durations of fuel injection (IFF) of each cylinder of the engine, comprising:
- generating mass air flow signals representative of the estimated inlet air flow of each cylinder of said engine;
- generating said feedforward signals the level of which corresponds to the level established by a look-up table in correspondence of the current speed of the engine and of the current values of all said mass air flow signals.
Dependencies are inferred from the claim text.