F - Mech Eng,Light,Heat,Weapons – 02 – N
Patent
F - Mech Eng,Light,Heat,Weapons
02
N
327/119
F02N 19/02 (2010.01) F02P 19/02 (2006.01) F23Q 7/06 (2006.01) F02B 3/06 (2006.01)
Patent
CA 1154101
ABSTRACT OF THE DISCLOSURE Apparatus for applying power to at least two heater filaments of two glow plugs in a diesel engine, or to a heater of one glow plug and a ballast load having substantially the same maximum rated voltage as the filament, is disclosed. The power source has a supply voltage greater than the maximum rated voltage of the filament and sufficiently high to cause an overheating temperat- ure capable of burning out the filaments under continuous operation. A switch is operable in a first position to prevent the application of the supply volt- age to the apparatus, operable in a second position to apply the supply voltage to the apparatus, and operable in a third position to maintain the condition of the second position and to apply the supply voltage to the apparatus and to a starter for the engine. The apparatus causes the application of full supply voltage to each of the filaments by turning the switch from the first to the second position, and, after a preheat time period which varies as an inverse function of available supply voltage and equals the time required to raise a filament from ambient temperature to a higher operating temperature sufficient for diesel engine starting, causes reduction of the voltage applied to the filaments and maintains the operating temperature thereof for a prestart time period. The apparatus also ensures that, after the switch is turned from the second to the third position, the application of the reduced voltage to the filaments is continued 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.
381012
Champion Spark Plug Company
Fetherstonhaugh & Co.
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