Method and device for controlling slip and/or for determining the longitudinal force or a flex work-proportional parameter, and vehicle tire therefore

A method for determining a tire spring travel or a footprint length or a load/pressure ratio during tire rotation, said method comprising the steps of:

• A) determining the torsional deformation of the tire, which is a function of the location of measurement, between a radially inner area of the wheel and a radially outer area of the tire in at least two positions, wherein at least one of said two positions is not vertically above or below an axis of rotation of the wheel, by the steps of:
• 1) positioning at least two marks at the wheel on different radii relative to an axis of rotation of the wheel, wherein a radially outer mark is positioned on a radially outer area of the tire;
• 2) arranging at least two sensors non-rotatingly in the vicinity of the wheel so as to be positioned on the different radii;
• 3) measuring for the rotating wheel at least one time period between passing of the at least two marks at the at least two sensors;
• 4) computing the torsional deformation from the at least one time period;
• B) calculating the tire spring travel or the footprint length or the load/pressure ratio from the torsional deformation.

A device for determining any of the tire parameters, acting during tire rotation on a tire mounted on a wheel rim, selected from the group consisting of a longitudinal force, a tire spring travel, a footprint length, and a load/pressure ratio, said device comprising:

• at least one first mark connected to the tire on a radially outer area of the tire at a first radius relative to the axis of rotation of the wheel;
• at least one second mark provided at the wheel in a radially inner area of the wheel at a second radius relative to the axis of rotation of the wheel;
• at least one first sensor non-rotatingly arranged at the first radius relative to said axis of rotation for recognizing passing of said at least one first mark;
• at least one second sensor non-rotatingly arranged at the second radius relative to said axis of rotation for recognizing passing of said at least one second mark;
• a measuring unit, operatively connected to said at least one first and second sensors, for measuring at least one time period between passing of said at least one first and second marks;
• a processing unit for determining from the at least one time period any of said tire parameters.