Method and associated device for sensing the air/fuel ratio...

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant

Reexamination Certificate

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C701S109000, C073S035120

Reexamination Certificate

active

07440839

ABSTRACT:
A method of sensing the air/fuel ratio in a combustion chamber of an internal combustion engine that may be easily implemented by a respective low-cost device includes a pressure sensor and a learning machine that generates a sensing signal representing the air/fuel ratio by processing the waveform of the pressure in at least one cylinder of the engine. In practice, the learning machine extracts characteristic parameters of the waveform of the pressure and as a function of a certain number of them generates the sensing signal.

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“Cylinder Air/Fuel Ratio Estimation Using Net Heat Release Data”, Tunestal et al; IFAC Workshop on Advances in Automotive Control, Mar. 28, 2001, pp. 239-247, XP001032740.
“Cylinder Air/Fuel Ratio Estimation Using Net Heat Release Data”, Tunestal et al; Control Engineering Practice, Pergamon Press, Oxford, GB, vol. 11, No. 3, 2003, pp. 311-318, XP001157572, ISSN: 0967-0661.

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