Ignition spark zone duration circuit
US4163192A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1978 |
| Grant date | Jul 31, 1979 |
| Priority date | — |
| Expiry date | Mar 27, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P17/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A circuit for generating a clean square electrical pulse having a duration equal to the spark zone duration in an internal combustion engine includes a comparator connected to produce an output when the signal input thereto, coupled from the primary winding of the ignition coil, exceeds a predetermined high voltage at the reference voltage input of the comparator. A one-shot multivibrator triggered by the initial output of the comparator generates an output continuing beyond the duration of high voltage ringing in the signal from the ignition coil. A "nor" gate receptive to outputs from the comparator and the one-shot produces an output which reduces the reference voltage applied to the comparator to a value below the plateau of the signal from the ignition coil. The "nor" gate provides the desired output spark zone duration pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.