Procedure for connecting a status detection device of a passive safety system for motor vehicles to a control unit
First Claim
1. A passive motor vehicle security system comprising:
- a control unit;
an interface circuit connected to the control unit, said interface circuit having a voltage source for generating an operating voltage and a voltage-stabilized current source for generating an operating current; and
a status detection device for detecting status information for the vehicle security system, connected to and supplying an electrical signal containing said status information to said interface circuit, said status detection device being based on one of a mechanical action and a non-mechanical action, and said interface circuit supplies either an operating voltage or an operating current to said status detection device depending on the action of the status detection device wherein said control unit activates one of the voltage source or the voltage-stabilized current source depending on the action of the status detection device and said interface circuit processes the signal which contains status information and subsequently transmits this processed signal to the control unit for evaluation.
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Abstract
The invention concerns a procedure for selectively connecting a status detection device--from a group of such devices based on different physical action principles, in particular belt buckle status detection, and seat occupation detection, within a passive safety system for motor vehicles, in particular an airbag system, and/or a belt pretensioning system,--to the signal input of a control unit, using a single wire connection, by causing the control unit to activate an appropriate current/voltage supply in accordance with the physical action principle, and by appropriately processing the signals generated by the status detection device, which signals will then be fed to the control unit for evaluation. Furthermore, an interface circuit is specified for implementing the procedure according to the invention.
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Citations
11 Claims
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1. A passive motor vehicle security system comprising:
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a control unit; an interface circuit connected to the control unit, said interface circuit having a voltage source for generating an operating voltage and a voltage-stabilized current source for generating an operating current; and a status detection device for detecting status information for the vehicle security system, connected to and supplying an electrical signal containing said status information to said interface circuit, said status detection device being based on one of a mechanical action and a non-mechanical action, and said interface circuit supplies either an operating voltage or an operating current to said status detection device depending on the action of the status detection device wherein said control unit activates one of the voltage source or the voltage-stabilized current source depending on the action of the status detection device and said interface circuit processes the signal which contains status information and subsequently transmits this processed signal to the control unit for evaluation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification