Schrader Electronics Limited

Peter Mackel

Samuel Kane Strahan

John Greer

Philip Craig

Ivan Reid

Ivan Andrew David Bailie

David Caskey

A TPM system wheel unit measures rotational period over a number of wheel revolutions, calculates a value of a period of the revolutions and wirelessly transmits the calculated value of the period to a tire pressure monitoring system receiver in the vehicle mounting the wheel. Alternatively, each wheel unit transmits an RF burst of a predetermined length and a received RF burst envelope modulated with a periodic modulation pattern is used to calculate the period of one wheel rotation for each wheel. A central vehicle electronic control unit monitors wheel speed signals for each wheel of the vehicle and calculates a period for the wheel speed signal for each wheel of the vehicle, bounded by a rolling window which may be of variable length. The calculated values are compared and the wheel unit and the wheel location are correlated therefrom.

Tire pressure monitoring system wheel rotation auto location

Methods for detecting and correcting data errors in an RF data link include identifying valid data frames and corrupted data frames by measuring a data corruption level for each transmitted data frame, comparing the measured data corruption level for each corrupted data frame to a data corruption threshold, reconstructing the corrupted data frames having a data corruption level below the data corruption threshold, reconstructing the data block using data from valid and reconstructed data frames, and/or verifying the data in the reconstructed data block.

Method for detecting and correcting data errors in an RF data link

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Louth, Ireland

Peter Mackel