| 摘要 |
A lobe sensor arrangement for an internal combustion ignition system provides a control signal to an ignition coil of the internal combustion engine to effect sequential firing of spark plugs, the ignition system comprising a distributor camshaft having a plurality of alternate circumferentially spaced lobes and valleys. The lobe sensor arrangement includes a pair of sensors spaced from the rotating camshaft and sensing the proximity of the spaced lobes to provide a pair of sensor output signals, and a processor circuit for analyzing the two sensor output signals and generating an ignition control signal upon the occurrence of the sensor output signals having values meeting relative predetermined criteria. One criterion requires that the two output signals be equal in magnitude. Another criterion may require that both output signals have magnitudes above a predetermined threshold. Yet another criterion may set upper and lower thresholds for a signal derived from the difference between the two sensor output signals. Adjusting the physical parameters of the lobe sensor arrangement selectively alters timing and dwell.
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