F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
327/119
F02P 19/02 (2006.01) F23Q 7/06 (2006.01)
Patent
CA 1220822
ABSTRACT OF THE DISCLOSURE The glow plug control circuit (28) is coupled by lead wire conductors to one or more glow plugs (31-38) for energizing same and includes a resistance bridge, the resistance (30) of the parallel connection of the one or more glow plugs plus the resistance (76) of the lead wire conductors being coupled to the bridge which has a first resistance leg, a second resistance leg, a third resist- ance leg (53), and a fourth resistance leg (54). A junc- tion (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) being coupled to a common or ground (67). A comparator (72) having plus and minus inputs (70,74) and an output (82) is coupled to the bridge. One junction (58) between two of the resistance legs (53,54) connected between the voltage source and ground defines a reference voltage and is coupled to the minus input (74). One of the other resistance legs coupled between the voltage source and ground includes two series connector 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 plug input (70) and has a voltage which is a percentage of the voltage across the glow plugs so that less than glow plug voltage is supplied to the comparator (72) and so that when the plugs (30) are heated to a set temperature, the voltage supplied from the divider (41) to the plus input (70) is equal to the voltage at said minus input. An oscillator circuit (84) for generating a clock signal at a fixed frequency is coupled to a bi- table multivibrator (80) having at least one reset input R2, at least one clock input CR1, and at least one output Q1. A power switching circuit (86) is coupled to the one or more glow plugs (30) and the at least one multibivrator output Q2 is coupled to the power switching circuit (86). The output (82) of the comparator (72) is coupled to the at least one reset input R2 and the output (156) of the oscillator circuit (89) is coupled to the at least one clock input CK2 of the bi-stable multivibrator (80).
471879
Caron La Verne A.
Handley Edward F.
Meredith & Finlayson
Navistar International Transportation Corp.
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