Internal-combustion engines – High tension ignition system – Electronic cylinder sequencing
Patent
1991-07-22
1992-12-29
Argenbright, Tony M.
Internal-combustion engines
High tension ignition system
Electronic cylinder sequencing
123644, 324379, F02P 1700
Patent
active
051742675
ABSTRACT:
Spark discharge signals monitored on primary windings of ignition coils of a coil per plug (CPP) ignition system are used to identify which cylinder of a cylinder pair is in compression and which cylinder in a cylinder pair is in exhaust. Once determined, the cylinder pair can be tracked such that the primary windings do not need to be monitored further. In one embodiment of the invention, the duration times of substantially simultaneous spark discharge signals in cylinders of a pair of cylinders are compared to one another. The shorter duration time signal indicates the cylinder in the compression cycle. One cylinder pair may be tested two or more times or one or more additional cylinder pairs may be tested to verify cylinder identification. In a second embodiment of the invention, two or more spark dwell signals are applied to the primary windings of the ignition coils for each spark event of a pair of cylinders. The time periods required for the second dwell signals to produce current flows in the primary windings equal to a predetermined current value is determined for each of the cylinders. The time preiods are then compared to one another with the shorter time period indicating the cylinder in exhaust.
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Abolins Peter
Argenbright Tony M.
Ford Motor Company
May Roger
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