Simplified electronic ignition timing and A/D conversion
US4284045A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1979 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Sep 12, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.