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Intrusion detecting apparatus for a vehicle

  • US 5,808,544 A
  • Filed: 02/27/1997
  • Issued: 09/15/1998
  • Est. Priority Date: 02/29/1996
  • Status: Expired due to Fees
First Claim
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1. An intrusion detecting apparatus for a vehicle comprising:

  • an ultrasonic transmitting/receiving sensor comprising;

    an ultrasonic transmitter, provided in a passenger compartment of said vehicle, for transmitting an ultrasonic signal, andan ultrasonic receiver, arranged closely to said ultrasonic transmitter, for receiving said ultrasonic signal;

    intrusion detecting means for detecting whether or not there is an intrusion into said passenger compartment based on said ultrasonic signal received by said ultrasonic receiver;

    stopping means for intermittently stopping a transmission of said ultrasonic signal from said ultrasonic transmitter; and

    cover detecting means for detecting whether or not said ultrasonic transmitting/receiving sensor is covered, said cover detecting means comprising means for determining when a level of said ultrasonic signal received by said ultrasonic receiver is equal to or below an upper limit level, whereinwhen said ultrasonic receiver receives said ultrasonic signal having said level being equal to or below said upper limit level after said stopping means stops said transmission of said ultrasonic signal, said cover detecting means judges that said ultrasonic transmitting/receiving sensor is covered and when said ultrasonic receiver receives said ultrasonic signal having said level being greater than said upper limit level after said stopping means stops said transmission of said ultrasonic signal, said cover detecting means judges that said ultrasonic transmitting/receiving sensor is not covered.

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