Nira Dynamics Ab

Robert Johansson

Peter Lindskog

Thomas Svantesson

Andreas Hall

Martin Lilja

Rickard Karlsson

Daniel Murdin

Gustav Lindmark

Olle Noren

Olle NORÈN

Olle Norén

The disclosed invention makes use of a wheel speed signal to detect a wheel anomaly such as a loose wheel or a wheel with zero pressure. The wheel speed signal is used as a basis to determine a first and a second detection signal. A further basis for determining the first and second detection signals are a first and second reference signal, respectively. The anomaly of e.g. a loose wheel is detected, according to the teaching of the invention if at least one of the detection signals exceeds a threshold. In particular, the disclosure relates to methods, systems and computer program products to achieve the mentioned objective.

Loose wheel detection

A system for determining a tire change status in a vehicle is provided. The system includes at least one processing device and a storage device. The at least one processing device may be arranged to: calculate a value of at least one reference parameter which may be used in indirect tire pressure monitoring; store the calculated value of said at least one reference parameter in the storage device; retrieve a previously stored value of said at least one reference parameter from the storage device; determine a similarity parameter based on a similarity between the calculated value and the previously stored value of said at least one reference parameter; and determine a tire change status, indicating whether or not the tires have been re-filled or replaced, by comparing said similarity parameter with a threshold.

Determining a tire change status in a vehicle

Methods, apparatuses and computer program products for estimating absolute wheel roll radii and/or a vertical compression value of wheels of a vehicle are disclosed, wherein yaw rates of the vehicle, wheel speeds of first and second wheels, and optionally lateral acceleration of the vehicle are measured and used as a basis for the estimation.

Estimation of absolute wheel roll radii and estimation of vertical compression value

The present invention relates to the detection of a short term irregularity under a driving vehicle having a first wheel, by determining a first sensor signal indicative of time dependent vibrations at the first wheel, using a first sensor; determining a second sensor signal indicative of a vertical movement the vehicle chassis, using a second sensor; and detect a short term irregularity of a road surface under the driving vehicle based on the first sensor signal and the second sensor signal.

Detection of short term irregularities in a road surface

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Linköping, Sweden

Robert Johansson