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Automatic wheel to tire pressure sensor correlation in distributed architecture

  • US 9,259,978 B2
  • Filed: 06/30/2014
  • Issued: 02/16/2016
  • Est. Priority Date: 06/30/2014
  • Status: Active Grant
First Claim
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1. A tire pressure monitoring system (TPMS) for a vehicle with a plurality of wheel locations, comprising:

  • a plurality of wheel-mounted TPMS sensor units transmitting RF sensor messages that are triggered when the respective sensor units detect being in respective rotational positions;

    a TPMS receiver unit;

    a control module, wherein the TPMS receiver unit and the control module have independent time references;

    a multiplex bus coupled between the TPMS receiver unit and the control module; and

    an anti-lock brake (ABS) unit coupled to the control module providing ABS wheel rotation data;

    wherein the TPMS receiver unit has an RF section, a decoding section, and a bus section, wherein the receiver unit generates TPMS wheel rotation data sent to the control module as multiplex bus messages each comprised of an identifier for a sensor unit that transmitted a respective RF sensor message, a first timestamp triggered when the RF section received the respective RF sensor message, and a second timestamp triggered when the bus section begins to transmit a respective multiplex bus message having contents decoded by the decoding section;

    wherein the control module compares the TPMS wheel rotation data and the ABS wheel rotation data to associate each TPMS sensor unit with a respective wheel location, wherein the control module assigns a third timestamp to each of the bus messages when received, and wherein the control module calculates an RF sensor message time for each bus message in response to subtracting a difference between the first and second timestamps from the third timestamp.

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