Internal-combustion engines – Igniters – Incandescent
Patent
1980-10-02
1982-09-28
Nelli, Raymond A.
Internal-combustion engines
Igniters
Incandescent
123145R, 361264, 219267, H05B 300, F23Q 700
Patent
active
043512917
ABSTRACT:
A glow plug for accelerating the ignition of fuel in a combustion chamber of a diesel engine is disclosed. The glow plug comprises a shell releasably engagable with a head of a combustion chamber of the diesel engine, and an electrically conducting, tubular heater carried by and electrically connected to the shell. The heater has an open end within the shell, and an opposed closed end extending longitudinally therefrom. The glow plug also comprises a heating filament disposed within the heater adjacent to the closed end and electrically insulated from the tubular body thereof. The heating filament has a first end electrically connected to the closed end of the heater and a second end; it is one which heats to a predetermined design temperature when a specified voltage is applied thereto. The glow plug also comprises an insulator carried by the shell, and a terminal assembly carried by the insulator. The terminal assembly comprises a heater terminal which is electrically connected to the second end of the heating filament, and at least one preheat terminal which is electrically connected to an intermediate coil of the heating filament. The rise in temperature of the heater is accelerated when a switching circuit enables application of the specified voltage to the preheat terminal(s) for a preheat time period equal to the time required to raise the temperature of the filament from ambient temperature to the design temperature.
REFERENCES:
patent: 2492755 (1949-12-01), McCollum
patent: 2884920 (1959-05-01), Moule et al.
patent: 3252122 (1966-05-01), Baxter
patent: 3749980 (1973-07-01), Baxter
patent: 4200077 (1980-04-01), Kanhl et al.
patent: 4281451 (1981-08-01), Mann
Champion Spark Plug Company
Nelli Raymond A.
Purdue John C.
Todd, Jr. Oliver E.
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