Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1995-04-19
1996-10-01
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
F02M 5100
Patent
active
055603416
ABSTRACT:
In apparatus and method for diagnosing an occurrence of misfire in any one or more of combustion chambers in a multi-cylinder internal combustion engine, correction value for each cylinder KTINT.sub.i is calculated only when a predetermined period of time has passed from a time at which a fuel supply cut-off is initiated and a determination is made on the basis of TDC period TINT that an engine revolution speed is stably reduced. A learning correction value KTINT.sub.i is updated and stored in a memory to be used for the misfire diagnosis only when a deviation between learning correction values between each cylinder whose period is measured in a range of the same crank angle falls in a predetermined range. Then, the result of measurement of the period TINT is corrected by the learning correction value KTINT.sub.i. A misfire determination value MISA is calculated on the basis of the corrected period TINT. Then, the presence or absence of the misfire is determined on the basis of the result of comparison between the misfire determination value MISA and a threshold (reference) value SL.
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Nelli Raymond A.
Unisia Jecs Corporation
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