Air bag activation device

An air bag activation system comprising first and second air bag activation devices, wherein

• said first air bag activation device comprises:
• a first sensor for electronically detecting acceleration;
• second and third sensors, mounted at right and left front ends of a vehicle, for electronically detecting acceleration;
• a squib driver inserted between a power supply and a squib;
• a microcomputer for generating from outputs of said first, second, and third sensors a driving signal for driving said squib driver;
• safing signal generating means for generating a safing signal from the outputs of said second and third sensors;
• and
• an AND gate for receiving said driving signal and said safing signal as inputs, and for producing an output which is supplied to said squib driver, and
• said second air bag activation device comprises:
• a second AND gate for receiving as inputs said safing signal and the output of said microcomputer supplied from said first air bag activation device;
• and
• a second squib driver which is driven by an output of said second AND gate.

An air bag activation device comprising:

• first acceleration detecting means for electronically detecting acceleration to determine if a crash has occurred;
• second acceleration detecting means mounted at a different position from said first acceleration sensor in order to identify crash mode;
• a squib for activating an air bag;
• control means for performing control to ignite said squib based on outputs of said first and second acceleration detecting means;
• first switching means which is connected in series with an ignition current path to said squib, and whose switching operation is controlled by said control means based on the output of said first acceleration detecting means and on the crash mode identified from the output of said second acceleration detecting means;
• and
• second switching means which is connected in series with said ignition current path to said squib and with said first switching means, and whose switching operation is controlled based on a signal output from said second acceleration detecting means.