Thermal switch-operated glow plug control device for diesel engines
US4466393A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 4, 1984 |
| Grant date | Aug 21, 1984 |
| Priority date | — |
| Expiry date | Jan 4, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P19/022
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A glow plug control circuit uses two normally closed thermally actuated switches in series with a power relay and a timer switch across the battery when the ignition switch is turned on; the power relay connects the glow plugs to the battery. At least one of the two switches cycles on and off to limit the temperature of the glow plugs. Another normally closed thermally operated switch has a heating element in series with the glow plugs for turning off a lamp after the glow plugs are energized for a predetermined time. If one or more of the glow plugs are open-circuited, the lamp is cycled on and off with the cycling on and off of current through the glow plugs by the power relay, to signal a fault condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.