Capacitor discharge engine ignition system with automatic speed limiting
US5245965A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1992 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Aug 26, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/027
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A capacitor discharge engine ignition system that includes a charge coil responsive to a flywheel magnet for charging an ignition capacitor, and a trigger coil responsive to the flywheel magnet for triggering an SCR rapidly to discharge the capacitor through the primary of the ignition coil. Circuitry for automatically electronically limiting overspeed operation of the engine includes a capacitor connected to the trigger coil, and a voltage divider connected between the capacitor and the gate of the SCR. This capacitor is charged upon occurrence of each trigger signal, and during normal operation has sufficient time to discharge through the voltage divider before generation of the charge signal. However, when the engine is operating at excessive speed, there is sufficient charge on the trigger capacitor to gate operation of the SCR, short circuiting the ignition charge capacitor and preventing operation of the ignition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.