WHEEL POSITION IDENTIFYING DEVICE, TRANSMITTER USED FOR THE SAME, AND TIRE PRESSURE DETECTING APPARATUS HAVING THE SAME

摘要

Car wheel position identification system, each transmitter (2a-2d) the wheel (5a-5d) is arranged. Each of the transmitter (2a-2d) comprises a two-axis acceleration sensor 22 and control unit 23 a. The two-axis acceleration sensor 22 detects the tangential acceleration and normal acceleration direction of the wheel (5a-5d) associated with the transmitter (2a-2d). The control unit 23 is a transmitter (2a-2d) is associated with the right wheel wheels (5a, 5c) or a product of the left wheel (5b, 5d) the tangential acceleration and the time derivative of the normal direction that the acceleration a determined based on the sign of, and stores data about the determination result to the frame. The receiver (3) identifies the location of the transmitter (2a-2d) based on the data stored in the frame to receive a frame from each of the transmitter (2a-2d). The wheel position identifying device is, for example, is used in a tire pressure detecting device.