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Tyre sensor will increase driver safety / caesar Research Center at the Hanover Fair

April 02, 2003

You break on black ice or on a wet highway, friction is almost zero and your car goes into a skid: A scenario which will be avoided in future. Scientists at the caesar Research Center in Bonn are developing a new technology for improving vehicle safety still further. At the Hanover Fair caesar will be presenting from April 7 to 12, 2003, on the stand of the Federal Ministry for Education and Research (BMBF), in Hall 18, EG, Stand E10, a tyre sensor which detects the condition of the road and gives advance warning of risks.

The tyre sensor is only a few square millimeters in size and is embedded directly in the rubber of the tyre tread. It is a wireless device: In the vehicle wheel casing there is an antenna which transmits a high frequency radio signal to the sensor. The signal from the sensor changes according to the road condition and is sent back to the antenna. It contains information on the deformation of the tyre, which varies according to the condition of the road surface. For example, a typical water bead is formed in front of the tyre when it is exposed to aquaplaning.

Regarding wet conditions, like snow or black ice, the friction between the tyre and the highway will be lower. The tyre sensor will also monitor this. The measurements of the sensor produce a characteristic curve for each situation. In future the measured results could be processed in the vehicle by an improved antiblocking system (ABS). Dangerous road conditions can be detected at an early stage with the tyre sensor, because the adhesion of the tyres is measured several times a second.

To improve the safety further, the sensor also permanently checks the tyre pressure. According to a study in France, wrong tyre pressure is the reason for twelve per cent of all vehicle accidents on motorways, either due to an extended braking distance or to burst tyres. The sensor is able to transmit a warning of an increase or decrease of the tyre pressure to the cockpit at an early stage.

In developing the tyre sensor the caesar scientists around Dr. Eckhard Quandt are collaborating with the tyre manufacturer Goodyear. Moreover the project is funded by the EUREKA programme (EUREKA Project S! 2375: Tyresense). Expectations are very high on all sides. When the sensor is ready for series production it will not only contribute to avoiding accidents. The environment will be spared because the tyres are given a longer service life. In the long term, the competitiveness of the European tyre and automobile industry will also be increased with the aid of the sensor.

The caesar International Research Center (center of advanced european studies and research) in Bonn commenced work in 1999. With a labor force that has now grown to 150, interdisciplinary teams are working in the areas of material sciences/nanotechnology, medical engineering and biotechnology. Research and industrial application go hand in hand: caesar is developing innovative products and methods and assists scientists in founding new companies. The new research building, which will accommodate up to 350 employees, will be inaugurated at the end of May.

Caesar

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