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Apparatus and method for changing frequency deviation

  • US 9,893,914 B2
  • Filed: 02/17/2015
  • Issued: 02/13/2018
  • Est. Priority Date: 02/20/2014
  • Status: Active Grant
First Claim
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1. A method for transmitting tire pressure monitoring system (TPMS) data using frequency-shift keying (FSK) the method comprising:

  • at a first time and at a first tire pressure monitoring system (TPMS) sensor, determining a first protocol to be used to transmit tire pressure monitoring data from a transmitter comprising the first TPMS sensor;

    selecting a first deviation between a first frequency used to transmit a logic one and a different second frequency used to transmit a logic zero, the first deviation being selected responsive to the first protocol determined;

    wherein the first deviation is selected at least in part by comparing a first deviation threshold with a first high frequency deviation associated with the first protocol;

    transmitting the TPMS data from the first TPMS sensor using the first frequency to represent a logic one and using the second frequency to transmit a logic zero;

    at a second time that occurs after the first time and at the first TPMS sensor, determining a second protocol to be used to transmit tire pressure monitoring data from the same transmitter of the first TPMS sensor;

    selecting a second deviation between a third frequency used to transmit a logic one and a fourth frequency used to transmit a logic zero;

    wherein the second deviation is selected at least in part by comparing a second deviation threshold with a second high frequency deviation associated with the second protocol;

    wherein the first deviation is different than the second deviation;

    transmitting the TPMS data from the first TPMS sensor using the third frequency to represent a logic one and using the fourth frequency to represent a logic zero;

    wherein the first protocol is changed to the second protocol during the operation of the first TPMS sensor;

    wherein the first protocol and the second protocol comprise one or more of a data format and baud rate;

    wherein the first protocol and the second protocol are determined at least in part by a controller.

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