초록 ▼

An ignition system comprises a ferro-magnetic disc mounted on the distributor shaft and provided with four pairs of protuberances, the spacing of the two protuberances of each pair corresponding to maximum and minimum spark advance positions. The protuberances are detected by a first variable reluct

An ignition system comprises a ferro-magnetic disc mounted on the distributor shaft and provided with four pairs of protuberances, the spacing of the two protuberances of each pair corresponding to maximum and minimum spark advance positions. The protuberances are detected by a first variable reluctance pick-up of fixed position and a second variable reluctance pick-up angularly movable by an engine load sensor. The two pick-ups, are connected respectively to two signal generators which produce a rectangular waveform of fixed phase and a rectangular waveform, the phase of which varies in accordance with engine load. The two waveforms have the same frequency. A function timing circuit responsive to both waveforms calculates engine speed, engine load and crank-shaft position and from these produces a trigger signal for each ignition spark. Further circuitry responsive to the trigger signals drives the ignition coil.

대표청구항 ▼

An internal combustion engine function control system comprising: signal generating means, mechanically driven by the engine, for providing a first signal train and a second signal, both the first signal train and the second signal train having a frequency equal to the required function frequency; e

An internal combustion engine function control system comprising: signal generating means, mechanically driven by the engine, for providing a first signal train and a second signal, both the first signal train and the second signal train having a frequency equal to the required function frequency; engine parameter sensitive means for varying the phase of the first signal train relative to the second signal train; function timing means responsive to the first signal train and to the second signal train, said function timing means including first time measuring means for measuring the time which elapses between two predetermined points of the second signal train during each cycle thereof, second time measuring means for measuring the time which elapses between a predetermined point of the second signal train and a predetermined point of the first signal train during each cycle of the second signal train, third time measuring time means for measuring the time which elapses from a point on the second signal train during each cycle thereof, a memory addressed by the first and second time measuring means, and a comparator having one input reponsive to the output of the memory and another input responsive to the third time measuring means; and an output circuit triggered by the output of the comparator.