Final ignition stage of a transistorized ignition system
US5107392A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1991 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Mar 8, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P3/051
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a final ignition stage of a transistorized ignition system (1) having a Darlington transistor (DT), in the collector-emitter circuit of which the primary coil current (I.sub.SP) of an ignition coil (ZS) flows and which is controlled via a base line (2). According to the invention, there is a regulating transistor (T.sub.1) arranged between the base line (2) to the base of the Darlington transistor (DT) and earth, said regulating transistor being driven in correspondence with the size of the primary coil current (I.sub.SP) and for purposes of current limitation partially conducting away to earth the base current flowing into the Darlington transistor (DT). Thus, a simple, cost-effective circuit for limiting the primary coil current and thus the stored ignition power is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.