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APPARATUS FOR DETECTING POSITIONS OF WHEELS OF VEHICLE AND APPARATUS FOR DETECTING TIRE INFLATION PRESSURE USING THE SAME

  • US 20090015393A1
  • Filed: 07/11/2008
  • Published: 01/15/2009
  • Est. Priority Date: 07/11/2007
  • Status: Active Grant
First Claim
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1. An apparatus for detecting positions of wheels of a vehicle having a body, comprising:

  • a plurality of transceivers mounted at a plurality of wheels each having a tire, wherein each transceiver comprises a reception unit comprising means for receiving a triggering signal, a first control unit comprising means for measuring a strength of the received triggering signal and containing data indicative of the measured strength of the received triggering signal into a frame of data, and a transmission unit that transmits the frame of data produced by the first control unit;

    a triggering device, arranged to the body, that outputs triggering signal;

    a receiver, arranged to the body, comprising a reception unit that receives the frame of data and a second control unit that determines that, based on the strength expressed by the data contained in the frame of data, each transducer is disposed at which one of the plurality of wheels; and

    an alarm member that issues an alarm when there occurs a system malfunction in the apparatus,whereinthe reception unit further comprises means for receiving a command for measuring noise strength;

    the first control unit further comprises means for calculating a strength of noise in response to reception of the command and contains data indicative of the calculated strength of the noise into a frame of data; and

    the second control unit comprisemeans for determining whether or not there is a reply of the flame of data containing the strength when the triggering device transmits the triggering signal,means for enabling the triggering device to transmit to the transceiver the command for measuring noise strength, when no replay comes from the transceiver,means for determining whether or not a noise strength based on the frame of data received in response to the command is less than a threshold, andmeans for controlling the alarm member so that the alarm member is allowed to issue the alarm only when it is determined that the noise strength is less than the threshold.

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