Simplified electronic ignition timing and A/D conversion

Details Simplified electronic ignition timing and A/D conversion Simplified electronic ignition timing and A/D conversion

1979-09-12

1981-08-18

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Fuel injection system

F02P 504

Patent

active

042840457

ABSTRACT:
A simplified electronic ignition timing system includes a pair of transducers for providing signals indicative of each cylinder-related sub-cycle of the engine and indicative of angular rotation within each cylinder sub-cycle of the engine; the angular rotation signals being converted to a speed signal which is used with a manifold pressure signal to address a table of values indicative of desired firing angle; the cylinder sub-cycle signal being utilized to preset and permit count advance of counting means responsive to the signal indicative of desired firing angle to produce a dwell signal which ends at the desired angle for the spark. In an embodiment, the pressure and speed signals are converted to digital signals for addressing a PROM. A multi-channel analog to digital converter includes a plurality of comparators and latches, one for each channel, each responsive to the analog and digital representations, respectively, of a stair step sawtooth waveform produced by an oscillator feeding a cyclic counter.

REFERENCES:
patent: 4114573 (1978-09-01), Mori
patent: 4127091 (1978-11-01), Leichle
patent: 4127092 (1978-11-01), Fresow
patent: 4162666 (1979-07-01), Maioglio
patent: 4175506 (1979-11-01), Sakamoto
patent: 4178893 (1979-12-01), Aoki
patent: 4220125 (1980-09-01), Nishida
patent: 4231331 (1980-11-01), Wrathall

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