Abstract: A circuit arrangement, attainable with simple switching means, for measuring decelerations of a vehicle that, caused by a braking operation occurring before a crash, lead to a change in the seat position of the vehicle occupants, comprises measuring the deceleration with an acceleration sensor (BS), which is designed to detect high decelerations occurring in a crash, and the presence of an amplifier (OP), which amplifies the output voltage (UO) of the sensor (BS), ascribed to low decelerations, so that the digital measurement signal (MS) derived from the amplified output voltage (UOV) by an analog/digital converter (AD) has adequately high resolution of the decelerations.

Abstract: A restraint system is disclosed which with high reliability trips one or more restraint devices, if in a collision there is the risk of injury to vehicle occupants. This restraint system is equipped with at least one seat position senor (SPS1, SPS2, . . . , SPSm), with which a change in the seat position of at least one vehicle occupant can be ascertained, and a control unit (SE) forms a first criterion for tripping one or more restraint devices (R1, R2, . . . , Rk) if the rate of change of the seat position exceeds a predeterminable threshold. The control unit (SE) forms a second criterion for tripping one or more restraint devices (R1, R2, . . . , Rk) if one or more precrash sensors (PCS1, PCS2, . . . , PCSn) signal an incipient collision. The control unit (SE) does not cause the tripping of one or more restraint devices (R1, R2, . . . , Rk) unless both tripping criteria are satisfied and also a braking datum (BI), advantageously generated by a brake light switch, is present.