US 6,293,140 B1Granted

Device for detecting the rotary behavior of a vehicle wheel

AssigneeContinental Teves AG & Co. oHG

InventorPeter Lohberg

Life of this patent

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Abstract

A device for detecting the rotational behavior of a vehicle wheel includes an encoder with permanent magnet areas, a stationary measurement transducer sensitive to magnetic fields, and electric circuits for evaluating the output signals of the measurement transducer. The permanent magnet areas are embedded into the tire wall of the vehicle wheel or applied to the tire wall. The measurement transducer includes two or more measuring elements which are arranged at a different radial distance from the axis of rotation and positioned in such a manner that upon distortion of the tire as a result of forces acting upon the tire, there is a change of the phase position between the measurement signals issued by the measuring elements. This change of the phase position is evaluated as a measure of the torque transmitted from the wheel to the road surface and/or as a measure of the instantaneous coefficient of friction.

Claims10

Dependent claims

A device for detecting rotational behavior of a vehicle wheel on a road surface, comprising:

a tire made of a rubber substance;
an encoder rotating with the vehicle wheel and having permanent magnet areas with alternating polarity that are evenly distributed in a circumferential direction of the vehicle wheel;
a stationary measurement transducer sensitive to magnetic fields for providing an output signal representative of the rotation movement of the wheel, the measurement transducer including a plurality of measuring elements that are offset from each other by a predetermined distance in both a radial and angular direction with respect to an axis of rotation of the vehicle wheel to define a first phase shift in the output signal;
and
an electric circuit for evaluating the output signal of the measurement transducer,
wherein a deformation in the vehicle tire causes a second phase shift different than the first phase shift indicative of a torque transmitted from the vehicle wheel to the road surface.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/194,283Filed 23 Nov 1998
Priority: DE 196 20 58122 May 1996
Granted: 25 Sep 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B60T 8/329
Deceleration: systems characterised by their speed sensor arrangements
B60C 13/001
Tyre sidewalls; Protecting, decorating, marking, or the like, thereof: decorating, marking or the like
B60T 8/1725
Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters: using tyre sensors, e.g.…
G01M 17/02
Wheeled or endless-tracked vehicles: tyres

Family

No related US applications are recorded in the indexed filing history.

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