Control circuit for electronic meter in an automotive vehicle
First Claim
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1. A control circuit for an automotive vehicle electronic meter, comprising:
- (a) first switching means for selectively supplying power to a first supply circuit;
(b) second switching means for selectively supplying power to a starter motor circuit;
(c) first supply means connected to said first switching means;
(d) cut off means connected to the first switching means and supplying to said meter power supplied independently by the first switching means, but adapted to cut off power from said first supply means when the second switching means supplied power to the starter motor circuit, said cut off means including a resistor connected between said electronic meter and the output of said first supply means; and
(e) means for grounding the junction between said meter and said resistor whenever said second switching means supplies power to said starter motor circuit.
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Abstract
During starter motor operation, an electronic meter is not supplied with electric power so that the meter does not operate whereby fluctuating and flickering indications of the electronic meter are prevented. When other meters are illuminated, the electronic meter is also illuminated, thereby avoiding the incongruity that the electronic meter is dark whereas other meters are illuminated.
3 Citations
9 Claims
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1. A control circuit for an automotive vehicle electronic meter, comprising:
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(a) first switching means for selectively supplying power to a first supply circuit; (b) second switching means for selectively supplying power to a starter motor circuit; (c) first supply means connected to said first switching means; (d) cut off means connected to the first switching means and supplying to said meter power supplied independently by the first switching means, but adapted to cut off power from said first supply means when the second switching means supplied power to the starter motor circuit, said cut off means including a resistor connected between said electronic meter and the output of said first supply means; and (e) means for grounding the junction between said meter and said resistor whenever said second switching means supplies power to said starter motor circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control circuit for an automotive vehicle electronic meter, comprising:
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(a) first switching means for selectively supplying power to a first supply circuit; (b) second switching means for selectively supplying power to a starter motor circuit; (c) first supply means connected to said first switching means; (d) second supply means connected to a lighting circuit; and (e) cut off means connected to the first switching means and supplying to said meter power supplied by the first switching means, but adapted to cut off power from the first supply means when the second switching means supplies power to the starter motor circuit; (f) the first supply means comprising a first diode disposed so that power can flow from said first switching means to said cut off means; (g) the cut off means being a relay, a coil of which is connected between the second switching means and ground, and a pair of normally closed contacts connected between the output of the first supply means and the meter; and (h) the first switching means being an accessory contact of an ignition switch and said first supply circuit being an accessory circuit. - View Dependent Claims (8, 9)
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Specification