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Vehicle occupant detection system

  • US 7,205,902 B2
  • Filed: 11/26/2004
  • Issued: 04/17/2007
  • Est. Priority Date: 01/16/2004
  • Status: Active Grant
First Claim
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1. An occupant detection system comprising:

  • a load sensor that measures a load applied to a seat of a vehicle; and

    an electronic control unit having a determination section that determines occupancy status of the seat based on a result of the load measurement, a power supply section that supplies power to the load sensor and the determination section with a power supply voltage lower than a battery voltage of the vehicle, and a communication section that sends a result of the occupancy status determination to an external device, wherein,the load sensor and the power supply section are electrically connected with each other via a sensor power supply line in which a resistor having a specific resistance is connected,the specific resistance is predetermined so that the resistor becomes open when a short occurs and does not affect to a dynamic range of the load sensor,the power supply section and the resistor are electrically connected with each other via an internal power supply line to which a zener diode having a specific breakdown voltage is connected through branch connection, andthe specific breakdown voltage is predetermined between the power supply voltage and a guaranteed voltage of the electronic control unit.

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