Internal-combustion engines – Charge forming device – Combined liquid and gaseous fuel
Patent
1998-03-06
2000-05-02
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Combined liquid and gaseous fuel
123672, F02M 2102, F02D 4100
Patent
active
060559632
ABSTRACT:
A method for adjusting a fuel control system of an internal combustion engine to account for variations in the energy content of a fuel delivered to the engine involves monitoring the O.sub.2 level of the engine exhaust gases. The fuel may be a gaseous fuel for example. The fuel control system utilizes a stored gaseous fuel energy content value (E.sub.G) to determine the necessary duration of a gaseous fuel admission valve control signal. The method includes sensing an actual engine exhaust gas O.sub.2 level and comparing the actual exhaust gas O.sub.2 level with a desired exhaust gas O.sub.2 level. The stored gaseous fuel energy content value (E.sub.G) is adjusted based upon the comparison. The desired exhaust gas O.sub.2 level may be determined as a function of one or more engine operating parameters which indicate a desired or expected air/fuel ratio, the level of O.sub.2 in the exhaust gases being an indicator of the air/fuel ratio.
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Brown Scott C.
Willi Martin L.
Caterpillar Inc.
Moulis Thomas N.
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