Importance

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Abstract

The glow plug control circuit (28) is coupled to one or more glow plugs (31,38) and includes a resistance bridge, the resistance (30) of the parallel connection of the glow plugs plus the resistance (76) of lead wire conductors being coupled to the bridge which has a first resistance leg, a second resistance leg, a third resistance leg (53), and a fourth resistance leg (54). A junction (128,130) between two resistance legs (56,53) is coupled to a source of voltage potential and a junction (67) between the other two resistance legs (53,54) is coupled to ground (67). A comparator (72) has plus and minus inputs (70,74) and an output (82). One junction (58) between two of the resistance legs (53,54) is coupled to the minus output (74). One of the other resistance legs coupled between the voltage source and ground includes two series connected resistors (51,52) which define a voltage divider (41) and which are coupled to the glow plugs. The junction (60) between the resistors (51,52) is connected to the plus input (70). An RC circuit (resistor 332 and capacitor 146) coupled to the output of the comparator (72) prevents the generation of false reset signals. Further a timed wait light reset circuit (340) ensures turning off of the wait light irrespective of a reset signal.

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First Claim