Natural gas engine control system
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United States of America Patent
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Aug 11, 1998
Issued Date -
N/A
app pub date -
Oct 25, 1996
filing date -
Sep 30, 1994
priority date (Note) -
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Abstract
A control system for an internal combustion engine can include a fuel molecular weight sensor to determine an actual and a desired Excess Air Ratio for an air/fuel mixture supplied to the engine. To prevent engine overload, the control system limits the amount of fuel delivered to the engine based on the amount of air available to the engine. High pressure exhaust gas can drive an air compressor which pressurizes inlet air. A exhaust bypass valve controls the amount of power delivered to the compressor, and the pressure and amount of inlet air delivered to the engine. Independent control of the main fuel flow and pilot fuel flow allows the control system to maintain a desired air/fuel ratio in the main combustion chamber and in the precombustion chamber.
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