Patent ID: 7243533

Claim:
A system for sensing at least one characteristic parameter of a tyre fitted to a vehicle, comprising: a movable unit; and a fixed unit; wherein the movable unit is combined with the tyre, wherein the movable unit comprises: a device for sensing the at least one characteristic parameter; a device for transmitting a signal out of the tyre; and a device for generating electrical energy; wherein the signal relates to the at least one characteristic parameter, wherein the fixed unit is combined with the vehicle, wherein the fixed unit comprises a device for receiving signals from the movable unit, wherein the electrical energy generating device is capable of supplying electrical energy to the sensing device, wherein the electrical energy generating device is capable of supplying electrical energy to the transmitting device, wherein the electrical energy generating device comprises a capacitor, the capacitor being charged with electrical energy in response to mechanical stresses applied to the tyre, and wherein the capacitor comprises two plates moving with respect to each other in response to the mechanical stresses.