Patent ID: 8396629

Claim:
A device for detecting a tire position, comprising: a plurality of transmitters provided on each of a plurality of vehicle wheels having a tire and detecting and transmitting a rotation direction and a rotation period of each vehicle wheel; and a receiver identifying the left and right position of the corresponding vehicle wheel according to the rotation direction of each vehicle wheel transmitted from the transmitter and identifying the front and rear position of the corresponding vehicle wheel according to the rotation period of each vehicle wheel, wherein each transmitter includes: a first acceleration detection unit converting a first acceleration signal of the corresponding vehicle wheel into a digital signal and outputting the converted digital signal as a square wave; a second acceleration detection unit converting a second acceleration signal of the corresponding vehicle wheel while having a phase difference of 90° from the first acceleration signal into a digital signal and outputting the converted digital signal as the square wave; a quadrature decoder receiving the first and second acceleration signals output as the square wave from the first and second acceleration detection units to detect a phase difference between the two signals, thereby detecting the rotation direction of the corresponding vehicle wheel and counting the number of ticks output whenever the phases of the two signals are changed to detect RPM of the corresponding vehicle wheel; a timer operated as a reference clock signal and receiving the first and second acceleration signals output as the square wave from the first and second acceleration detection units to count the number of clocks of the reference clock signals for each tick output whenever the phases of the two signals are changed, thereby measuring a period of each tick to detect the rotation period of the corresponding vehicle wheel; and a transmitting control unit (MCU) generating the signal including the rotation direction of the corresponding vehicle wheel detected from the quadrature decoder and the rotation period of the corresponding vehicle wheel detected from the timer and transmitting the generated signal to the receiver.