Device for the control of an active element of an occupant retention system in a vehicle
First Claim
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1. A device to drive an active element of an occupant restraint system of a vehicle, comprising:
- a control unit;
sensors having signals fed to the control unit;
an ignition path which has an energy store, a safety switch, an active element and at least one ignition switch, controlled by the control unit; and
a prestage which drives the safety switch and is controlled by the control unit, the prestage enabling the safety switch if at least two sensors identify a sufficient acceleration, and the prestage inhibiting the safety switch if a sensor and/or the control unit is defective, whereinthe prestage has a plurality of prestage switches whose inputs are connected to the control unit and whose through-connection branches are connected in series,a resistor is connected in series with the through-connection branches, anda safety transistor turns on when the prestage switches are enabled by the control unit.
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Accused Products
Abstract
In order to produce a safing concept, an extra-safing-sensor in the control unit (ECU) is foregone and the safing function from one of the available acceleration or turn-rate sensors (S1 to S5) is replaced. Furthermore a pre-stage is connected to the firing element (Z1, Z2), before the existing firing path, which, depending upon the sensor signals as analysed by the controller unit (1), controls a safety switch (T11), in series with the firing switches and the firing element.
24 Citations
12 Claims
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1. A device to drive an active element of an occupant restraint system of a vehicle, comprising:
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a control unit; sensors having signals fed to the control unit; an ignition path which has an energy store, a safety switch, an active element and at least one ignition switch, controlled by the control unit; and a prestage which drives the safety switch and is controlled by the control unit, the prestage enabling the safety switch if at least two sensors identify a sufficient acceleration, and the prestage inhibiting the safety switch if a sensor and/or the control unit is defective, wherein the prestage has a plurality of prestage switches whose inputs are connected to the control unit and whose through-connection branches are connected in series, a resistor is connected in series with the through-connection branches, and a safety transistor turns on when the prestage switches are enabled by the control unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification