Test circuit for detection of malfunctions in an electric triggering device
First Claim
1. A test circuit for detection of malfunctions in electronic triggering devices for protection of vehicle occupants, comprising:
- two or more of triggering devices connected in parallel, said triggering devices arranged with a first connector connected to ground and a second connector connected to a control unit for supplying a triggering current to said triggering devices upon detection of a triggering condition;
a voltage regulator for supplying a constant reference voltage;
a current generator for generating a constant current connected in series between said voltage regulator and said second connector for generating a test current to said triggering devices; and
two voltage comparators connected between ground, said second connector and said voltage regulator for detecting the voltage across said triggering devices.
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Accused Products
Abstract
A test circuit for detection of malfunctions in an electric triggering device (10, 11) for protection of vehicle occupants. The triggering devices (10, 11) are arranged with a first connector (12) connected to earth (13) and a second connector (14) connected to a control unit for supply of a triggering current to the triggering devices when detecting a triggering condition. The test circuit comprises a voltage regulator (17), a current generator (18,19) connected in series between the voltage regulator and the connection of the triggering devices (10,11) to the control unit for generating a test current to the triggering devices, and two voltage comparators (24,25) connected between the earth connection (13), the connection (14) to the control unit and the voltage regulator for detecting the voltage across the triggering devices (10,11).
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Citations
4 Claims
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1. A test circuit for detection of malfunctions in electronic triggering devices for protection of vehicle occupants, comprising:
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two or more of triggering devices connected in parallel, said triggering devices arranged with a first connector connected to ground and a second connector connected to a control unit for supplying a triggering current to said triggering devices upon detection of a triggering condition; a voltage regulator for supplying a constant reference voltage; a current generator for generating a constant current connected in series between said voltage regulator and said second connector for generating a test current to said triggering devices; and two voltage comparators connected between ground, said second connector and said voltage regulator for detecting the voltage across said triggering devices. - View Dependent Claims (2, 3, 4)
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Specification