Ignition circuit for internal combustion engine having alternately operable high and low speed control devices
US4509496A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1982 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | Nov 22, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P1/083
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An ignition circuit for an internal combustion engine includes an ignition coil having a primary winding which is controlled by a power transistor. The lower transistor is controlled by either a first or a second control transistor. When the primary current flowing through the primary winding of the ignition coil is lower than a predetermined value, cut-off of the power transistor is controlled by the first control transistor. When the primary current is higher than the pre-determined value, cut-off of the power transistor is controlled by the second control transistor which becomes conductive prior to conduction of the first control transistor. Thus, two independent control means are alternately operated responsive to the primary current, which is a function of engine speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.