Safety arrangement
First Claim
1. An ignition circuit for an air-bag, comprisinga series connection of a first switch, a second switch and an igniting squib for an air-bag, the series connection connected between a potential of a power supply and a potential of a ground;
- a disable means, coupled to the power supply, for disabling the power supply;
a first safety device, coupled to a first node in the series connection to derive a first potential from the series connection, for activating the disable means for disabling the power supply when the first potential at the first node is less than a first predetermined potential and is greater than a second predetermined potential; and
a second safety device, comprising a first comparator coupled to a first reference potential and to the first node in the series connection, for activating the disable means for disabling the power supply when the first potential is different from the first reference potential.
1 Assignment
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Accused Products
Abstract
A safety arrangement for an ignition circuit for an air-bag comprising a series connection between two switches and an ignition squib between a power supply and earth. A potential derived from a predetermined point in the series connection is monitored by a central processing unit and by a comparator which compares the monitored potential with a reference potential. When the monitored potential exceeds predetermined limits, both the central processor unit and the comparator operate to disable the power supply.
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Citations
12 Claims
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1. An ignition circuit for an air-bag, comprising
a series connection of a first switch, a second switch and an igniting squib for an air-bag, the series connection connected between a potential of a power supply and a potential of a ground; -
a disable means, coupled to the power supply, for disabling the power supply; a first safety device, coupled to a first node in the series connection to derive a first potential from the series connection, for activating the disable means for disabling the power supply when the first potential at the first node is less than a first predetermined potential and is greater than a second predetermined potential; and a second safety device, comprising a first comparator coupled to a first reference potential and to the first node in the series connection, for activating the disable means for disabling the power supply when the first potential is different from the first reference potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification