Positioning transmit device and method of automobile tire temperature and pressure monitoring system

The invention provides a positioning transmit device and method of an automobile tire temperature and pressure monitoring system (TPMS). The positioning transmit device comprises a microprocessor, two acceleration sensors, a tire temperature and pressure sensor, an ASK emitting chip and an antenna matching filter circuit which are arranged on the hub of an automobile tire, wherein the acceleration measuring axes of the acceleration sensor I and the acceleration sensor II coincides with the radial line of the hub, and the acceleration measuring axes and the radial line all point to the same direction. By using the device and method of the invention, the influence of metal components such as the tire steel nets and the automobile body on the radio-frequency signals sent by the transmit device of the TPMS can be effectively overcome. The principle of the invention is simple and is easy to realize, thus the data transmission quality of the TPMS can be increased and the transmission power of the transmit device in