System and method for performing auto-location of a tire pressure monitoring sensor arranged with a vehicle wheel using confidence interval analysis and rollback events

摘要

Auto-location systems and methods of tire pressure monitoring sensor units arranged with a wheel of a vehicle detect a predetermined time (T1) when a wheel phase angle reaches angle of interest using a rim mounted or a tire mounted sensor. The systems and methods transmit a radio frequency message associated with a wheel phase angle indication. The wheel phase angle indication triggers wheel phase and/or speed data such as ABS data at the predetermined time (T1) to be stored. A correlation algorithm is executed to identify the specific location of a wheel based on the wheel phase and/or speed data at the predetermined time (T1). TPM sensor parameters from a tire pressure monitoring sensor unit are assigned to the specific location of the wheel based on a confidence interval width analysis of the ABS data at the predetermined (T1). The confidence interval width analysis identifies the specific location of the wheel whose ABS sensor shows a lowest confidence interval width as a result of a normal distribution pattern or similar pattern. The confidence interval width analysis may calculate a weighted cumulative confidence interval width for the ABS data which experience rollback events.

主权项

1. A wheel auto-location method, comprising:
receiving at a control unit of a vehicle, from one of a plurality of tire pressure monitoring (TPM) sensors, a radio frequency (RF) transmission that indicates a TPM sensor wheel phase angle measurement point during a rotation of a wheel and TPM sensor parameters, wherein the RF transmission is associated with a phase correlation data storage event trigger; storing a current content of a rolling window of antilock brake system (ABS) data for each of a plurality of ABS sensors indicative of a wheel phase angle in response to the phase correlation data storage event trigger, wherein a time period covered by the rolling window is the same or greater than a time period between the TPM sensor wheel phase angle measurement point and a receipt point of the RF transmission, and the current content of the rolling window corresponds to the ABS data incremented between the TPM sensor wheel phase angle measurement point and the receipt point of the RF transmission; calculating a time of the TPM sensor wheel phase angle measurement point based on the time period between the TPM sensor wheel phase angle measurement point and the receipt point of the RF transmission; determining a relevant ABS data value at the time of the TPM sensor wheel phase angle measurement point from the current content of the rolling window of the ABS data based on the TPM sensor wheel phase angle measurement point over time; receiving further measurements that indicate the TPM sensor wheel phase angle at multiple points in time; determining the relevant ABS data for each of the plurality of ABS sensors for each of the multiple points in time for which the TPM sensor wheel phase angle is received; generating a histogram array for the relevant ABS data for each of the plurality of ABS sensors, the histogram array comprising a plot of the relevant ABS data and the TPM sensor wheel phase angle; applying a confidence interval to each histogram array of the relevant ABS data, wherein the confidence interval excludes outlier data; calculating a confidence interval (COIN) width value from each histogram array from which the outlier data has been excluded; and applying an auto-location algorithm to identify a specific location of the wheel based on determining which of the plurality of ABS sensors generates the histogram with the lowest COIN width value for the TPM sensor wheel phase angle and assigning one of the plurality of TPM sensors to a same wheel location as the ABS sensor having the lowest COIN width value.