System for monitoring a vehicle with pneumatic tires, signal analysis method, and vehicle tire
AssigneeSiemens Aktiengesellschaft
InventorsFranz Hillenmayer, Gregor Kuchler
Life of this patent
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Abstract
A system for monitoring a vehicle fitted with pneumatic tires has, on at least one wheel of the vehicle, a pressure sensor for sensing the tire inflation pressure, and a deformation sensor joined to the tire for sensing deformations of the tire. A data transmission device transmits the output signals from the sensors to an analysis device, which determines from the output signals a result in dependence on the output signals from the two sensors. Frequency-dependent analysis is employed to derive, from the output signals from the deformation sensor, a signal corresponding to the static loading on the tire and a signal corresponding to the nature of the road surface.
Claims18
A system for monitoring a vehicle with pneumatic tires, comprising:
- a pressure sensor disposed to sense a tire inflation pressure of at least one wheel of the vehicle and to output a sensor output signal;
- a deformation sensor for sensing deformations of a tire, joined to a sidewall of the tire at a location that is subject to strong deformation when a pneumatic pressure in the tire is too low in relation to a weight of the vehicle, said deformation sensor generating an output signal in dependence on the deformation of the sidewall;
- an analysis unit;
- a data transmission device for transmitting the sensor output signal of said pressure sensor and the output signal of said deformation sensor to said analysis unit;
- said analysis unit including a filtering device configured to subject the output signal from said deformation sensor to low-frequency filtering in dependence on a speed of rotation of the wheel, to generate a signal substantially corresponding to a quasi-static tire deformation, and to high-frequency filtering in dependence on the speed of rotation of the wheel, to generate a signal characterizing a nature of a road surface.
A method of analyzing an output signal from a pneumatic tire deformation sensor affixed on or in a sidewall of the tire that is subject to deformation when a pneumatic pressure value is too low, the method which comprises:
- analyzing a low-frequency range of the output signal, correlating with a wheel rotation speed to generate a correlated signal, and averaging the correlated signal to generate an averaged signal, for generating from the averaged signal a signal substantially corresponding to a static loading on the pneumatic tire;
- and
- analyzing a high-frequency range of the output signal, correlating with the wheel rotation speed to generate a correlated signal, and generating, from the correlated signal, a signal representing the nature of the road surface.
A vehicle tire, comprising:
- a sidewall subject to sidewall deformation when a tire inflation pressure is insufficient, and a deformation sensor disposed in or on said sidewall of the tire in a region thereof where said sidewall deforms when the tire inflation pressure is insufficient.
Dependencies are inferred from the claim text.