System for decreasing the power consumption in the output transistor of an ignition system
US4246881A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 2, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Jul 2, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P3/051
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
When the current through the primary winding of an ignition coil of an ignition system in an internal combustion engine has increased to a predetermined value, base current for a power transistor connected in series with the coil is shunted away, causing a rise in voltage across the primary winding. When the voltage rise across the primary winding has reached a maximum allowable value less than the value required to cause the generation of a spark, the transistor is switched back to the fully conductive state. This cycle is repeated during the time the transistor would normally be conductive and terminates at the ignition time, that is at the time the transistor is blocked by the ignition timing circuit of the internal combustion engine to create the spark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.