Abstract: A method of detection of a run-flat condition of a vehicle tire, said tire being mounted on a wheel, wherein: a quantity f(?, t) is sensed, which varies which the angular displacement of the wheel in time; measuring signals are elaborated, which vary with the angular speed of the wheel d?(t)/dt; a quantity characteristic of the dispersion of measuring signals is calculated; an alarm is set off when the characteristic quantity satisfies a given ratio.

Abstract: A method of detection of a run-flat condition of a vehicle tire, said tire being mounted on a wheel, wherein: a quantity f(?, t) is sensed, which varies which the angular displacement of the wheel in time; measuring signals are elaborated, which vary with the angular speed of the wheel d?(t)/dt; a quantity characteristic of the dispersion of measuring signals is calculated; an alarm is set off when the characteristic quantity satisfies a given ratio.

Abstract: A method of detection of a run-flat condition of a vehicle tire, said tire being mounted on a wheel, wherein:

Abstract: Process and devices for detection of the actuation of support of a tire on safety support, the process and these devices being characterized by the fact that, when support actuation occurs, they detect the appearance of a resonance mode characteristic of supported rolling travel in the components of the vehicle suspension.

Abstract: Coding of the value of any number of quantities measured in a tire, for example its pressure and its temperature, is carried out using a ratio of time intervals TP/Tr, Tt/Tr. This frees the device from the effect of the time shift of the modulation system, the time shift affecting simultaneously the numerator and the denominator of said ratio.

Abstract: In order to provide for the deflation of a tire, there is provided an orie in the rim of a wheel, a pusher element extending through the rim in a gas tight manner, the pusher element having one end communicating with gas pressure inside the tire and including means for selectively closing the orifice. The pusher element is mounted to the rim for movement between a first position wherein the means for selectively closing closes the orifice and a second position wherein the means for selectively closing opens the orifice. The pusher element has another end outside of the tire with a cam mounted thereto. A presser means mounted to be stationary relative to the rotation of the tire selectively engages the cam and moves the pusher element to the second position to control the opening of a valve to deflate the tire.

Abstract: A device for exciting and monitoring wheel modules for monitoring tires crises control lines (5, 6) which excite simultaneously all the wheel modules except one, which is monitored. For this purpose, it comprises one exciting and monitoring assembly (2) per wheel. Each assembly (2) comprises an insulation transformer (20) of which the secondary (21) has a central point (21N) connected to earth. This arrangement ensures good electromagnetic compatibility and good insensitivity to radio frequencies.

Abstract: To assure inflation of a tire 2 during its rotation, a hose 3 is placed on he inside periphery of rim 1. A pressure roller 5, solid with the wheel carrier and therefore non-rotatable, causes a local reduction in the section of hose 3. During rotation of tire 2, air is forced from an orifice 31 forming an air intake, to an inside volume 20 of tire 2, via a check valve 4. To provide deflation, a roller rests on a pusher which controls the opening of valve 4.

Abstract: 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.

Abstract: A coding circuit comprises an astable multivibrator which transforms the measurement of the variables in question, for instance pressure and temperature, into a time measurement. The astable multivibrator delivers a pulse signal whose pulse width is a function of the temperature and the cyclic ratio of which is a function of the pressure.