Internal-combustion engines – Charge forming device – Including means responsive to instantaneous change in engine...
Patent
1995-05-09
1996-06-25
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including means responsive to instantaneous change in engine...
731173, F02D 4122, G01M 1500
Patent
active
055290418
ABSTRACT:
An engine misfire detection system for an internal combustion engine includes a microprocessor based controller for providing an increasing fuel command signal to any cylinder in the engine. The contribution to engine speed of the particular cylinder under test is monitored and compared to the contribution to engine speed of the previous two cylinders in the firing sequence. A misfire condition is detected if the average contribution to engine speed of the cylinder under test does not exceed the greater average contribution to engine speed of the previous two cylinders by a predetermined amount after a predetermined number of engine cycles. A temporary fault is logged for the cylinder under test if such a misfire condition occurs a predetermined subsequent number of times thereafter. If such a temporary fault condition is detected during a subsequent driving cycle, a driver warning lamp is illuminated.
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Argenbright Tony M.
Cummins Engine Company, Inc.
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