Nira Dynamics Ab

Fredrik Gustavsson

Peter Lindskog

Peter Hall

Tony Gustavsson

Urban Forssell

Tony Gustafsson

Anders Stenman

Niclas Persson

Jonas Nilsson

Markus Drevo

The invention is directed to a system, a method and a computer program including program code for carrying out the method, when executed on a processing system, of estimating a tire pressure deviation of a vehicle's tire (). The system includes an input section () adapted to receive as an input signal a vehicle signal, a calculation section () adapted to calculate at least one shape factor of a resonance peak associated with the vehicle signal spectrum () on the basis of the input signal, and a determination section () adapted to derive, depending on said at least one shape factor, a tire pressure signal indicative of a tire pressure deviation within the vehicle's tire ().

Method, system and computer program for estimation of the pressure

A method of determining the velocity (&#x3bd;) of a vehicle is provided. The vehicle has at least one pair of a front and a rear wheel which are spaced by a wheel spacing (B). Front and rear wheel speed signals (&#x3c9;) are determined which are indicative of the time dependent behavior of the front and rear wheel speeds, respectively. The front and rear wheel speed signals (&#x3c9;) are correlated in order to determine a specific correlation feature indicative of the time delay (&#x3c4;) between the front wheel and rear wheel speed signals. The velocity (&#x3bd;) of the vehicle is determined based on the correlation feature and the wheel spacing (B).

Method and system of determining the absolute velocity of a vehicle

A method of estimating the occurrence of a specific tire pressure deviation between actual and nominal pressure values for one or a plurality of wheels (i) is provided. One or more wheel radius analysis measurement values (&#x394;R) are subsequently obtained from a wheel radius analysis component (), wherein the wheel radius analysis measurement values (&#x394;R) are related to single wheel radius values (&#x394;r) of which each is indicative of the wheel radius of a particular wheel (i). One or more wheel vibration data values (&#x394;&#x192;) are subsequently obtained from a wheel vibration analysis component (), wherein each of the wheel vibration data values (&#x394;&#x192;) is indicative of a vibration phenomena in the time dependent behavior of the rotational velocity of a particular wheel (i). One or more tire pressure output values (&#x3b7;, &#x394;p) are calculated on the basis of both the wheel radius analysis measurement values (&#x394;R) and the wheel vibration data values (&#x394;&#x192;) wherein each tire pressure output value (&#x3b7;, &#x394;p) is indicative of the specific tire pressure deviation for a particular wheel (i).

Tire pressure estimation

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Linköping, Sweden

Fredrik Gustavsson