A connection arrangement toregulador incandescent device au-

摘要

When a switch S is closed, a comparator 2 causes an astable multivibrator 4 to close a switch 8 thereby supplying power to glow plugs A and lighting a lamp 2. Eventually the voltage across a capacitor C2 equals a reference voltage UREF2 whereupon the comparator 2 causes the multivibrator 4 to switch off the power supply to the glow plugs and also turns off the lamp 2. The engine is ready to be started. When there is no current supply to the glow plugs, they act as thermocouples whose voltage is compared in a comparator 1 with a reference voltage UREF1 to keep the glow plug temperature at that necessary for igniting fuel. An engine temperature probe R5 connected to a comparator 3 turns off the power supply to the glow plugs when the voltage across a capacitor C3 equals a reference voltage UREF3. IMAGE