Internal-combustion engines – Starting device – For airplane
Patent
1980-07-03
1983-03-01
Lall, P. S.
Internal-combustion engines
Starting device
For airplane
123145A, 219492, 219497, F02N 1700
Patent
active
043752055
ABSTRACT:
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 temperature capable of burning out the filament under continuous operation. A switch 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 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 comprises means for applying the full supply voltage to each of the filaments by turning the switch from the first to the second position, and means operable, 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, to reduce the voltage applied to the filaments by the first-named means and to maintain the operating temperature thereof for a prestart time period. The apparatus also includes means operable, after turning the switch from the second to the third position, to continue application of the reduced voltage to the filaments 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: 1662031 (1928-03-01), McCormick
patent: 1848966 (1932-03-01), Nero
patent: 4160153 (1979-07-01), Melander
patent: 4196712 (1980-04-01), Kawamuna et al.
patent: 4258678 (1981-03-01), Abe
patent: 4285307 (1981-08-01), Steinke
Champion Spark Plug Company
Lall P. S.
Purdue John C.
Todd, Jr. Oliver E.
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