Driver circuit for solenoid operated fuel injectors
US4905120A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1988 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Oct 20, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/2093
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A driver circuit for first and second coils includes first and second selector switches coupled in series between first terminals of the coils and a first common junction, first and second diodes coupled in series between second terminals of the first and second coils, respectively, and a second common junction and a source of first potential coupled to the first common junction. A modulation switch is coupled between the second common junction and a source of second potential. The selector switches and modulation switches are operated to cause currents of controlled magnitude to flow through the coils. The circuit has improved fault immunity whereby at least one coil can be energized even when another coil has been subjected to a chassis ground fault.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.