초록 ▼

A wireless tire inflation pressure measurement device is used to obtain inflation pressure information for a tire of a vehicle and a signal therefrom may be used for determining the location of the tire. An identifier may be associated with the inflation pressure information for each wheel of the ve

A wireless tire inflation pressure measurement device is used to obtain inflation pressure information for a tire of a vehicle and a signal therefrom may be used for determining the location of the tire. An identifier may be associated with the inflation pressure information for each wheel of the vehicle. Tire rotation speed may be determined by amplitude fluctuations of a radio frequency carrier from a radio frequency transmitter rotating with the wheel. Differences in wheel rotation speeds during a turn may be used in determining the location of each tire of the vehicle. An antenna may be placed on each wheel toward the outer perimeter of the wheel and connected to the radio frequency transmitter. A radio frequency identification (RFID) tag and pressure sensor may be used as the wireless tire inflation pressure measurement device and a RFID pickup coil may be provided in each wheel well for pickup of the inflation pressure signals from each RFID tag on a wheel.

대표청구항 ▼

1. A method for determining inflation pressures of tires and locations thereof on wheels of a vehicle, said method comprising the steps of:providing a wireless inflation pressure measuring device for each wheel of a vehicle, each of the wireless inflation pressure measuring devices has an antenna lo

1. A method for determining inflation pressures of tires and locations thereof on wheels of a vehicle, said method comprising the steps of:providing a wireless inflation pressure measuring device for each wheel of a vehicle, each of the wireless inflation pressure measuring devices has an antenna located toward an outer perimeter of a respective one of the wheels, wherein each of the wireless inflation pressure measuring devices transmits from its respective antenna a radio frequency signal comprising inflation pressure information of a tire mounted on the respective one of the wheels; providing an inflation pressure monitor having a radio frequency receiver adapted for receiving the radio frequency signals from each of the inflation pressure measuring devices, whereby an amplitude of each of the received radio frequency signals varies periodically with each rotation of the respective one of the wheels; determining a rotation speed of each of the wheels by detecting the periodic amplitude variations of each of the radio frequency signals as the respective ones of the wheels rotate; detecting when the vehicle turns and the relative direction thereof, determining relative wheel rotation speeds; and assigning a location to each of the wheels based on the relative wheel rotation speeds and vehicle turning direction.