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AssigneeCompagnie Generale Des Etablissements Michelin
InventorsAndre Dosjoub, David Myatt
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A tire-monitoring device comprises, on a wheel of a vehicle, a converter stage which processes an electric signal representing measurements of the pressure and/or temperature of the tire in pulse form and a stage for transmitting the signal to the vehicle by inductive coupling. In order to minimize the consumption of electric energy by circuit components on the wheel, a solid state switch responsive to the transmission of energy from the vehicle to the wheel disconnects the circuit components on the wheel from the energy source. Also, in order to further minimize the consumption of electrical energy, only the positions of the ascending and descending fronts of the electric signal pulses representing the measurements are transmitted to the vehicle and the transmission coil is connected to the source of energy only when the pulse signals have ascending or descending fronts.
A system for feeding energy to electric circuits fastened to a wheel in a device for monitoring tires of a vehicle, the transmission of energy from the chassis of the vehicle to the wheel being effected by inductive coupling between two coils, one connected to the chassis and the other to the wheel, the storage of the energy being effected by at least one condenser fed by the coil connected to the wheel via a rectifier, the condenser feeding the electric circuits with energy, characterized by the fact that the system comprises means responsive to the transmission of energy from the chassis to the wheel for disconnecting said circuits from said condenser.
A system for feeding energy to a coil fastened to a wheel in a device for monitoring tires of a vehicle, the electrical energy necessary being accumulated by storage means, the monitoring device having a converter stage which serves for detection and coding in the form of a pulse signal of the value of at least one measured variable, the device furthermore comprising a stage for the transmission of the pulse signal based on the inductive coupling between said coil and another coil fastened to the chassis of the vehicle, characterized by the fact that the transmission stage comprises switching means responsive to said pulse signal for connecting the storage means to the coil connected to the wheel when the pulse signal has an ascending front or a descending front and disconnecting the storage means at all other times.
Dependencies are inferred from the claim text.