Internal-combustion engines – Charge forming device – Including means responsive to instantaneous change in engine...
Patent
1997-07-29
1998-09-22
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including means responsive to instantaneous change in engine...
731173, 701110, F02D 4104
Patent
active
058099697
ABSTRACT:
A methodology of computing a learned combustion stability value and applying the learned combustion stability value to control engine operation is provided. Engine speed is sensed for each expected firing of individual cylinders of the engine. The difference in engine speed for a selected cylinder firing and a cylinder firing occurring two cylinder firings earlier is determined to provide an expected acceleration value. The difference between successive expected acceleration values is computed. A learned combustion related value is determined as a function of the difference in the successive learned acceleration values and is an indication of engine roughness. The operation of the engine is controlled as a function of the learned combustion related value. The learned combustion stability value is advantageously employed so as to modify the fuel injection to an internal combustion engine, especially following a cold engine start so as to reduce hydrocarbon emissions. This is accomplished by modifying a program target fuel injection value as a function of the learned combustion related value so as to reduce the fuel injected into the engine by fuel injectors.
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Borland Mark S.
DeGroot Kenneth P.
Fiaschetti John
Weber Gregory T.
Argenbright Tony M.
Calcaterra Mark P.
Chrysler Corporation
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