Voltage control circuit for protecting glow plug from overheatin

Details Voltage control circuit for protecting glow plug from overheatin Voltage control circuit for protecting glow plug from overheatin

1982-06-28

1985-04-16

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219492, 219202, 219508, 219497, 123179H, 361 91, H05B 102

Patent

active

045117926

ABSTRACT:
A circuit for controlling the voltage applied to a glow plug used to assist the starting of a diesel engine, the circuit including a circuit network including a normally-closed relay contact connected in parallel with a serially connected voltage-dropping resistor and a normally-open relay contact, the circuit being serially connected with the heating element of the glow plug and with a power supply for producing the voltage, and a timer connected to the power supply. The normally-closed relay contact is opened when the temperature of the heating element exceeds a preset value which is below a steady-state heating temperature, and the normally-open relay contact is closed by the timer a predetermined time after voltage is applied to the glow plug, whereby the glow plug is heated rapidly. In the event of an abnormal rise in power supply voltage during the rapid heating of the glow plug, the supply of current to the glow plug is interrupted temporarily to prevent glow plug burn-out.

REFERENCES:
patent: 4002882 (1977-01-01), McCutchen
patent: 4036199 (1977-07-01), Chateau
patent: 4114582 (1978-09-01), Rabus et al.
patent: 4280452 (1981-07-01), Kawamura et al.
patent: 4285307 (1981-08-01), Steinke
patent: 4331109 (1982-05-01), Arnault
Patents Abstracts of Japan, vol. 4, No. 29, Mar. 1980, pp. (M-2) [511]; vol. 3, No. 101, Aug. 1979, pp. (M-70).

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