Motorcycle Safety

Effect and Cause-Based Friction Potential Estimation

Tire-road contact is the only connection between a vehicle and the ground and consequently has a crucial influence on the vehicle’s handling behaviour. Due to this fact, the friction potential is an essential parameter for all dynamic vehicle control systems such as the anti-lock braking system (ABS) or (motorcycle) stability control system, and it is also valuable information for the less experienced rider. Thus, knowledge about the actual tyre-road friction potential could help in designing next-generation Advanced Driver Assistance Systems (ADAS).

Estimation of the actual tyre-road friction potential from measured vehicle states has been extensively explored for passenger cars, but lacks attention for motorcycles. Therefore, the aim of the project is to explore the potential of “effect-based” and “cause-based” friction estimation methods both in simulation and real-world testing with an instrumented motorcycle.

Effect-based methods for estimating the friction potential are developed within the project, where the maximum adhesion potential estimation is based on the change of the motorcycle and tyre dynamic behaviour at changing road friction conditions. The instrumented motorcycle is used to derive the tyre characteristics (Magic Formula) for different surfaces and conditions (dry and wet asphalt, gravel, …) and validate the motorcycle and tyre model for simulation and friction potential estimation. For the cause-based approach, a wetness sensor is attached to the motorcycle, and the respective wetness level detection algorithm is tested.

Figure 1: Longitudinal tyre-road characteristics for different road friction conditions

References

Ott, Christoph, Florian Klinger, Johannes Edelmann, and Manfred Plöchl. "Theoretical and experimental findings for an tyre-road friction potential estimator for motorcycles., opens an external URL in a new window" (2023). Bicycle & Motorcycle Dynamics 2023 (BMD 2023), Symposium on the Dynamics and Control of Single Track Vehicles, Delft, the Netherlands.

Researchers

Project Funding

Industrial

Contact

Univ.Prof. Dipl.-Ing. Dr.techn. Johannes Edelmann

Head, Research Unit of Technical Dynamics and Vehicle System Dynamics

Send email to Johannes Edelmann

Ao.Univ.Prof. Dipl.-Ing. Dr.techn. Manfred Plöchl

University Lecturer, Research Unit of Technical Dynamics and Vehicle System Dynamics

Send email to Manfred Plöchl

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