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Apparatus for triggering a passive safety device for protecting passengers in a vehicle

  • US 5,157,268 A
  • Filed: 12/11/1990
  • Issued: 10/20/1992
  • Est. Priority Date: 12/20/1989
  • Status: Expired due to Fees
First Claim
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1. A circuit arrangement for triggering a safety device for protecting passengers in a motor vehicle in response to a collision, comprising a single collision acceleration sensor (1), a first signal evaluating channel connected to an output of said sensor and including first means for evaluating an acceleration sensor output signal to produce a velocity signal, a second signal evaluation channel connected to said output of said sensor and including second means for evaluating said acceleration sensor output signal to produce a distance signal, and a logic circuit stage (61) for combing said velocity signal and said distance signal to selectively produce an output trigger signal for selectively triggering said safety device, said circuit arrangement further comprising a minor impact sensor circuit (41), and a rear impact sensor circuit (31 to 36), and wherein said first means of said first signal evaluation channel comprises a first integrator (7) connected in series with an arrangement of a plurality of threshold value switches, and wherein said logic circuit stage (61) comprises a first AND-gate (64) receiving as a first input, an output from a first threshold value switch (8) of said plurality having a low threshold value, said first AND-gate (64) receiving as a second input, a combined signal including an output of said minor impact sensor circuit and for a prescribed time duration an output of a timing circuit (12) for detecting a beginning of an impact, a first OR-gate (65) receiving as a first input, an output signal of said first AND-gate (64) and as a second input, an output signal of a second threshold value switch (9) of said plurality of threshold value switches in said first signal evaluation channel, a second AND-gate (66) receiving as a first input, an output signal of said first OR-gate (65) and as a second input, an output signal of said rear impact sensor circuit (31 to 36), a second OR-gate (67) receiving as a first input, an output signal of said second AND-gate (66) and as a second input, an output signal from a third threshold value switch (10) of said plurality of threshold value switches having a high threshold value, and a third AND-gate (68) receiving as a first input, an output signal from said second OR-gate (67) and as a second input, an output signal from said second signal evaluation channel, whereby an output signal of said third AND-gate (68) forms said output trigger signal for selectively triggering said safety device.

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