Auxiliary acceleration sensor device for an air bag system

摘要

To improve a response rate and an impact detection precision of an auxiliary acceleration sensor device for an air bag system, an auxiliary acceleration sensor device includes a longitudinal G sensor for sensing a longitudinal acceleration G of a vehicle, and lateral G sensor for sensing a lateral acceleration G of the vehicle. The longitudinal G sensor includes a constant current source circuit, a detector portion for outputting an electrical signal representative of a longitudinal acceleration G, and an amplifier portion for amplifying the signal received from the detecting portion. The comparator includes comparing elements that compare the voltage values corresponding to longitudinal threshold values Tf1 to Tf4 of the longitudinal acceleration G with an output signal of the amplifier portion. Lateral G sensor includes a constant current source circuit, a detector portion for outputting an electrical signal representative of a lateral acceleration G, and an amplifier portion for amplifying the signal received from the detecting portion. Comparator means includes comparing elements which compare the voltages corresponding to lateral threshold values Ts1 to Ts4 of the lateral acceleration G with the output signal of the amplifier portion. An OR circuit coupled for reception with the comparator means outputs a signal to a main controller of an air bag control system when predetermined conditions are satisfied.