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Control system for vehicle occupant protection device in a motor vehicle

  • US 6,513,832 B1
  • Filed: 09/26/2001
  • Issued: 02/04/2003
  • Est. Priority Date: 01/12/1999
  • Status: Expired due to Fees
First Claim
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1. A control system for vehicle occupant protection device in a motor vehicle, comprising:

  • a sensor device having at least one X-Y acceleration sensor with two sensitivity axes which are perpendicular to one another and which lie in a plane parallel to a plane defined approximately by a vehicle longitudinal axis and a vehicle transverse axis; and

    an additional acceleration sensor with a sensitivity axis which lies parallel to the plane which is parallel to the plane defined by the vehicle longitudinal axis and the vehicle transverse axis;

    the sensitivity axis of said acceleration sensor enclosing with one of the sensitivity axes of the X-Y acceleration sensor an angle which can have a value between 15° and

    75°

    ;

    an evaluation device to evaluate acceleration signals which are supplied by the X-Y acceleration sensor, and to generate a triggering signal to trigger the vehicle occupant protection device; and

    a switching unit which is connected to the evaluation device and outputs a firing signal as a function of the triggering signal and another signal, wherein a reference value is formed from the X-Y acceleration signals of the acceleration sensor in a safing evaluation unit, and wherein in the case of a significant deviation of an acceleration signal supplied by the additional acceleration sensor from the reference value, a disable signal is generated and supplied to the switching unit which prevents the firing signal for triggering the vehicle occupant protection device from being output even if a triggering signal is generated by the evaluation device, and a threshold value is formed in the safing evaluation unit from at least one of the received acceleration signals, and in that the disable signal is prevented from being output to the switching unit only if the threshold value is exceeded by at least one of the acceleration signals.

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