Tire pressure monitoring system wheel rotation auto location

摘要

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.

主权项

1. A method comprising:
measuring, by a tire pressure monitoring system wheel unit, a rotational period over a number of revolutions of a wheel mounting the wheel unit; calculating, by the wheel unit, a value of a period for the number of revolutions; wirelessly transmitting, by the wheel unit, the calculated value of the period for the number of revolutions to a tire pressure monitoring system receiver in a vehicle mounting the wheel; monitoring, by a central vehicle electronic control unit, wheel speed signals for each wheel of the vehicle; calculating, by the central vehicle electronic control unit, a period for the wheel speed signal for each wheel of the vehicle, bounded by a rolling window; comparing the calculated value of the period for the number of revolutions transmitted by the wheel unit to each of the calculated period for the wheel speed signals; and correlating the wheel unit and a wheel location from which the period for the wheel speed signals was calculated which most closely matches the transmitted calculated value of the period for the number of revolutions to locate each wheel unit to a specific wheel location on the vehicle.