| 摘要 |
A very high performance digital ignition system is disclosed which includes a precision angular position sensor within the distributor of an internal combustion engine (or otherwise coupled to the engine to sense its angular position) to provide accurate timing information which is applied to gating means for selectively passing bursts of triggering pulses having, in the exemplary embodiment, a 7-to-1 duty cycle ratio. The selected burst of pulses are applied to a driver circuit which provides power amplification to energize the primary circuit of an ignition coil. An alternative mode of operation is also disclosed which simulates a conventional make and break ignition system to effect a service mode. In the service mode of operation, a single pulse is issued to the ignition coil upon the occurrence of the first or second pulse of the pulse burst after the angular position sensor has sensed that a cylinder firing operation should be instituted. As a result, ordinary timing and diagnostic instruments may be used during the service mode of operation to very accurately establish the ignition timing during normal, burst mode operation.
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