Ignition system for internal combustion engines
US4638785A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1986 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Feb 7, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P3/0453
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An ignition system for an internal combustion engine is disclosed. The ignition system includes a timing signal detector responsive to the rotation speed of an engine to generate a pulse signal including a leading edge and a trailing edge corresponding to the ignition timing and having a predetermined duty cycle, a triangular wave generator for generating a triangular wave voltage synchronized with the trailing edge of the pulse signal, a voltage storing circuit for storing the voltage level of the triangular wave voltage in synchronism with the leading edge of the pulse signal, a voltage divider for dividing the stored voltage in the voltage storing circuit to generate a reference voltage, a comparator for comparing the reference voltage and the triangular wave voltage to detect a difference therebetween, a charging and discharging controller for correcting the stored voltage in the voltage storing circuit so as to reduce to zero the difference at the leading edge of the pulse signal, a threshold voltage generator for generating a threshold voltage which is offset from the stored voltage by an amount corresponding to the desired dwell time of an ignition coil, and an energization …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.