F - Mech Eng,Light,Heat,Weapons – 02 – N
Patent
F - Mech Eng,Light,Heat,Weapons
02
N
327/119, 123/199
F02N 99/00 (2010.01) F02P 19/02 (2006.01) F02B 3/06 (2006.01)
Patent
CA 1100582
C-2893 D-2,698 DIESEL ENGINE GLOW PLUG ENERGIZATION CONTROL DEVICE Abstract of the Disclosure A glow plug or plugs for a Diesel engine is energized directly or indirectly through the normally closed contacts of a thermally operated switch, preferably a bimetal switch, in thermal communication with the engine and a local electric heater that is energized by the same source as the glow plug and controlled in unison with the glow plug. The bimetal switch is arranged to switch off at a temperature of the order of 80°C which, at an initial engine temperature of the order of -18°C, permits the glow plug to heat to the order of 900°C. The hysteresis in the bimetal switch is arranged to close the switch when the glow plug has cooled to the order of 810°C, thus the glow plug is cycled between the order of 800°C and 900°C. It has been found that the glow plug temperature rise at elevated temperatures is substantially less than propor- tional to heat input. As a consequence, the effect of lower engine temperature is to produce increased glow plug tempera- ture less than proportional to the bimetal temperature rise over engine temperature prior to switch opening, and the effect of increased engine temperature is to lower the glow plug temperature less than in proportion to the lesser bimetal temperature rise over engine temperature. With proper selec- tion of the bimetal switch characteristics, the variation of glow plug temperature with engine temperature substantially matches the engine requirement for ease of start. Further, the glow plugs are initially heated at a very rapid rate and reach temperatures suitable for engine crank more quickly than with conventional, continuous, glow plug energization.
307947
General Motors Corporation
Gowling Lafleur Henderson Llp
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