A WIRELESS TIRE PRESSURE AND/OR WHEEL SPEED SENSING SYSTEM FOR AIRCRAFT

摘要

A wireless tire pressure and wheel speed sensing system for an aircraft is provided. The system comprises the following components. A resonant circuit is mounted to a wheel of the aircraft for monitoring the pressure of a tire mounted to said wheel. The resonant circuit comprises a wire loop of a predetermined inductance. An interrogating circuit is magnetically coupleable to said resonant circuit and is operative to induce magnetically a variable frequency current in the wire loop of said resonant circuit. The resonant circuit generates a corresponding variable frequency electric field in response to said induced current. The variable frequency electric field includes a resonant frequency commensurate with the pressure of said tire. A magnetic field altering apparatus is provided for alternating the magnetic coupling between said wire loop and said interrogating circuit to cause a rate of amplitude modulations of said variable frequency electric field commensurate with said wheel speed. A receiving circuit E-field is coupleable to said resonant circuit and operative to receive the amplitude modulated variable frequency electric field of said resonant circuit and to generate a signal representative thereof. A first processing circuit is coupled to said receiving circuit for processing the signal to generate a pressure reading of said tire based on the resonant frequency thereof. A second processing circuit is coupled to said receiving circuit for processing said signal to generate a wheel speed reading based on the rate of amplitude modulations thereof.