Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Patent
1989-12-26
1991-08-06
Smith, Leonard E.
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
123435, 123239, F02D 2300
Patent
active
050366696
ABSTRACT:
In the subject invention an electronic control unit is used to control the air/fuel ratio in an engine combustion chamber in response to sensed engine parameters. More particularly, a magneto interface produces an ignition signal which is delivered to a spark plug. The spark plug 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 such as an ion probe, for example, is further disposed in the combustion chamber longitudinally from the spark plug. The sensor produces an ionization signal in response to a flame front propagating past the sensor. A buffer circuit 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 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 calculates a volumetric air/fuel ratio. The volumetric air/fuel ratio is indicative of the volume of air and fuel in the combustion chamber, and it does not account for fluctuations in fuel quality. Finally, a wastegate is controlled in response to the volumetric and combustion signal air/fuel ratios.
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SAE paper 860485 entitled "In-Cylinder Measurement of Combustion Characteristics Using Ionization Sensors", 6/1990.
Earleson Walter E.
Mirhakimi Siamak
Caterpillar Inc.
Keen Joseph W.
Kocharov Michael I.
Smith Leonard E.
Vander Leest Kirk A.
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