Ignition system with ignition coil primary current control
US4196711A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 9, 1978 |
| Grant date | Apr 8, 1980 |
| Priority date | — |
| Expiry date | Jan 9, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P3/051
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
To permit use of integrated circuits in solid-state ignition control systems in which the current through the primary of the ignition is pulsed when a predetermined level is reached, a threshold switch which has switching hysteresis is connected to control conduction of an auxiliary semiconductor connected in parallel with the ignition coil, to control the auxiliary semiconductor to become conductive when the current through the coil rises above a predetermined first threshold level to thereby shunt the primary thereof or to block the auxiliary semiconductor switch when the current through the coil drops below a predetermined second threshold level and thereby removes the shunt from the primary of the ignition coil and permits current flow from a power source thereto to ensure, reliably, alternate opening and closing of the main controlled switch, typically a transistor, in series with the coil and the auxiliary controlled switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.