TPMS Tire Auto Localization with RF Transceivers

Paper #:
  • 2017-01-1638

Published:
  • 2017-03-28
Abstract:
TPMS sensor measures air pressure and temperature in the tire and transmits tire information as wireless messages to TPMS central unit which consists of RF receiver. TPMS central unit needs to determine the exact sensor locations (e.g. Front Left, Front Right, Rear Left or Rear Right) in order to correctly identify the location of the tire with low pressure. The identified tire with low pressure is displayed on dash board in the car. Thus, determination of the location of a particular tire made automatically by the TPMS system itself or tire auto localization is required. Tire auto localization is implemented in several methods. A new method is proposed in this paper. The proposed method uses at least two RF transceivers as repeaters. Each transceiver receives wireless messages (eg. Pressure, temperature, sensor ID) from the nearest TPMS sensor and transmits them with RF transceiver identity to TPMS central unit. RF transceiver is fixed near to each wheel in the car and its position is known to TPMS central unit. Based on its Received Signal Strength (RSSI), RF transceiver identifies sensor signal from the nearest TPMS sensor. To improve tire auto localization, an algorithm is developed by providing frequency distribution of wireless messages based on the signal strengths. The algorithm compares the frequency distribution to a predetermined frequency distribution to determine the position of the tire on the vehicle. The proposed method consumes less power and does not require additional wirings in the car as compared to using low frequency repeaters. Tire auto localization using hybrid method correlates sensor speed with wheel speed signal from anti braking system and so it involves access to other system. In practice, access to wheel speed signals is difficult.
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