| 摘要 |
of the Invention Apparatus And Method For Controlling The Air/Fuel Ratio Of An Internal Combustion Engine In the subject invention an electronic control unit 12 is used to control the air/fuel ratio in an engine combustion chamber (46) in response to sensed engine parameters. More particularly, a magneto interface (106) produces an ignition signal which is delivered to a spark plug (110). The spark plug (110) is disposed essentially in the center of a combustion chamber, and it ignites an air/fuel mixture in the chamber in response to the ignition signal. A sensor (126) such as an ion probe, for example, is further disposed in the combustion chamber (46) longitudinally from the spark plug. The sensor (126 produces an ionization signal in response to a flame front propagating past the sensor (126). A buffer circuit (112) receives the ignition and ionization signals and produces a combustion signal in response to a time difference between the reception of these signals. The electronic control unit 12 receives the combustion signal and calculates a combustion signal air/fuel ratio in response to the combustion signal. Both the combustion signal and the combustion signal air/fuel ratio are responsive to changes in the quality of the fuel in the combustion chamber. Subsequently, the control unit 12 calculates a volumetric air/fuel ratio. The volumetric air/fuel ratio is indicative of the volume of air and fuel in the combustion chamber (46), and it does not account for fluctuations in fuel quality. Finally, a wastegate (56) is controlled in response to the volumetric and combustion signal air/fuel ratios.
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