Patent ID: 7397353

Claim:
A wireless tire pressure and wheel speed sensing system for an aircraft, said system comprising: a resonant circuit mounted to a wheel of the aircraft for monitoring the pressure of a tire mounted to said wheel, said resonant circuit comprising a wire loop of a predetermined inductance; an interrogating circuit magnetically coupleable to said resonant circuit and operative to induce magnetically a variable frequency current in the wire loop of said resonant circuit, said resonant circuit generating a corresponding variable frequency electric field in response to said induced current, said variable frequency electric field including a resonant frequency commensurate with the pressure of said tire; a magnetic field altering apparatus 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 coupleable to said resonant circuit and operative to receive said amplitude modulated variable frequency electric field of said resonant circuit and to generate a signal representative thereof; a first processing circuit coupled to said receiving circuit for processing said signal to generate a pressure reading of said tire based on the resonant frequency thereof; and a second processing circuit coupled to said receiving circuit for processing said signal to generate a wheel speed reading based on the rate of amplitude modulations thereof.