Internal-combustion engines – Starting device – For airplane
Patent
1984-01-04
1984-08-21
Lall, Parshotam S.
Internal-combustion engines
Starting device
For airplane
123179B, 123145A, 219494, 219510, F02N 1700
Patent
active
044663935
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.
REFERENCES:
patent: 3675033 (1972-07-01), Richard et al.
patent: 4075998 (1978-02-01), Krauss et al.
patent: 4177785 (1979-12-01), Sundeen
patent: 4207853 (1980-06-01), Phillips
patent: 4261309 (1981-04-01), Biondi
patent: 4300491 (1981-11-01), Hara et al.
patent: 4312307 (1982-01-01), Cooper
patent: 4337389 (1982-06-01), Bell
patent: 4413174 (1983-11-01), Tuig
Lall Parshotam S.
Technar Incorporated
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