Trouble detector for air bag appliance

Abstract

Abstract PURPOSE: To quickly and surely detect a troble , suppress the increase in the number of parts and attain reliability, by connecting resistors in parallel with collision detector switches and providing a differential amplifier circuit and a comparator circuit. CONSTITUTION: Percussion caps 2, 3 and G sensors 4, 5 are electrically coupled to each other and are energized by a battery 1. The resistors 4b, 5b are connected in parallel with the switches 4a, 5a of the G sensors 4, 5 to supply minute current to the percussion caps 2, 3. The differential amplifier circuit 11 is composed of an operational amplifier 12 and gain adjusting resistors 13, 14, 15, 16 to produce an output voltage Vd corresponding to the terminal voltage Vs across the percussion caps 2, 3. The wind comparator 17 is composed of operational amplifiers 18, 19 etc. to compare the output voltage Vd of the differential amplifier circuit 11 with two reference voltages of different level at points a, b. Thereby, the trouble is quickly and surely detected, the increase in the number of parts is suppressed and reliability is attained COPYRIGHT: (C)1979,JPO&Japio

Inventors

• 👤 Toshio Yasui
• 👤 Motoharu Naito

Bibliographic Details