| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tire sensor unit capable of restraining cost on a required constitution for determining a position of a wheel. <P>SOLUTION: This tire sensor unit 3 includes a pressure sensor 11 for detecting internal pressure of a tire, an RF transmission circuit 16 for transmitting a data signal of indicating the internal pressure detected by the pressure sensor 11 by radio transmission, and an acceleration sensor 13 for generating a detecting signal corresponding to an attitudinal change in itself caused by rotation of the wheel. The pressure sensor 11 is also constituted so as to function as an attitude sensor for generating the detecting signal corresponding to the attitudinal change in itself caused by the rotation of the wheel. The pressure sensor 11 and the acceleration sensor 13 are arranged to the wheel so that phases of their detecting signals are mutually shifted, and a shifting method of the phases is different in response to the rotational direction of the wheel. <P>COPYRIGHT: (C)2013,JPO&INPIT |
