The relationship between variations in strain on the inner surface of pneumatic tires and mechanical parameters including, contact patch length, effective radius, wheel load and braking torque was investigated. The calculations were carried out using finite element analysis and simulate the strain sensor signal when a tire rotates. The following results were obtained: 1. Contact patch length is estimated using the distance between two time derivative peaks in the strain data. The contact patch length provides the effective radius and in turn the slip ratio. 2. Wheel load can be estimated using maximum compressive strain and braking torque using the compressive strain ratio. The friction coefficient can be obtained from the ratio of those two values. 3. It is suggested that optimized braking control and road condition warning systems use strain data. Braking control is optimized by keeping the slip ratio constant. A road condition warning system could be actuated if the recorded friction coefficient at a certain slip ratio fell below a reference value for safe road conditions.
Intelligent tires using strain measurement for improved tire safety
Intelligente Reifen durch Dehnungsmessung für verbesserte Reifensicherheit
2008
12 Seiten, 12 Bilder, 1 Tabelle, 26 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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