Glow plug control circuit

Details Glow plug control circuit Glow plug control circuit

1980-08-25

1981-12-29

Lall, P. S.

Internal-combustion engines

Starting device

For airplane

123145A, 219499, F02N 1700

Patent

active

043076890

ABSTRACT:
Switch-controlled apparatus for actuating a power switch to enable application of power from an associated power supply to a heater filament of a glow plug in a diesel engine is disclosed. The filament is one which is heated to a predetermined design temperature when a specified voltage is applied thereto. The power source has a supply voltage greater than the specified voltage of the filament. A switch accessible to an operator of the engine is operable in a first position to prevent the application of the supply voltage to the apparatus, operable in a second position to apply the supply voltage through a first terminal of the apparatus, and operable in a third position to apply the supply voltage through the first terminal and through a second terminal of the apparatus and to a starter for the engine. The apparatus comprises means operable, after the switch has been turned from the first to the second position, to actuate the power switch for a preheat time period which varies as an inverse function of available supply voltage and equals the time required to raise the temperature of the filament from ambient temperature to the design temperature. The apparatus also includes means operable, after the preheat time period, to alternately actuate and then deactuate the power switch in a cyclic fashion to maintain the design temperature of the filament for a prestart time period. The apparatus also includes means operable, after turning the switch from the second to the third position, to continue the cyclical actuation and deactuation of the power switch for an afterglow time period predetermined by the amount of time required for smooth engine idling and to minimize engine noise and white smoke emission.

REFERENCES:
patent: 2142210 (1939-01-01), Rippingille
patent: 2840067 (1958-06-01), Carlson
patent: 3551686 (1970-12-01), Koehler et al.
patent: 4002882 (1977-01-01), McCutchen
patent: 4137885 (1979-02-01), Van Ostrom
patent: 4177785 (1979-12-01), Sundeen
patent: 4188931 (1980-02-01), Waterhouse
patent: 4196712 (1980-04-01), Kawamura et al.

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