Modeling and Identification of an Electric Vehicle Braking System: Thermal and Tribology Phenomena Assessment 2020-01-1094
A rapidly shifting market and increasingly stringent environmental regulations require the automotive OEMs to produce more efficient and low-emission electric vehicles. Regenerative braking has proven to be a major contributor to both objectives, enabling the charging of the batteries during braking on one side, and a reduction of the load and wear of the brake pads on the other side. The optimal sizing of such systems requires the availability of good simulation models to improve their performance and reliability at all stages of the vehicle design. This enables the designer to study both the integration of the braking system with the full vehicle equipment and the interactions between electrical and mechanical braking strategies.
The present paper presents a generic simulation framework for the thermal and wear behavior of a mechanical braking system, based on a lumped parameter approach. The thermal behavior of the system is coupled back to the friction coefficient between the pad and the disc to assess its effect on braking performance. Additionally, the effect of wear and temperature on the generation of airborne particles is investigated.
Subsequently, experimental data collected on an electric vehicle is used to identify the previously described simulation models following a systematic validation procedure. The instrumentation method and challenges, as well as the experimental procedure used to collect the data on a chassis dynamometer and in real-world driving conditions, are described. Finally, simulation results for different driving scenarios are used to show the comparative evaluation between model and experimental results.
Thomas D’hondt, Bart Forrier, Mathieu Sarrazin, Tommaso Favilli, Luca Pugi, Lorenzo Berzi, Riccardo Viviani, Marco Pierini
Siemens Industry Software NV, Università degli Studi di Firenze