The main function of a vehicle braking system is to decelerate the vehicle predictable and reliable in any driving condition. Overheating of brake components can cause undesirable effects, such as brake fading or boiling of brake fluid. To ensure safe operation, aerodynamic concepts such as brake ducts, deflectors or brake disc ventilation have been introduced and steadily improved. These measures ensure sufficient heat-rejection but can reduce brake performance under rainy conditions, due to water ingress towards the brake. This phenomenon is called “brake wet fading” and results in a decrease of the friction coefficient between brake pad and disc.

    During the vehicle development process, brake components (pad and disc materials) are tested on component test benches. However, realistic environmental and aerodynamic boundary conditions in the vehicle cannot be applied during these tests. In order to obtain more realistic results, measurements for brake wet fading are taken on the test track in later development stages, although environmental conditions such as side wind and ambient temperature, rarely remain constant. This makes direct comparisons between different test configurations difficult.

    For these reasons, FKFS developed a new test procedure for brake wet fading in the FKFS Thermal Wind Tunnel. It provides a robust test environment in which aerodynamic measures regarding brake wet fading can be evaluated. This paper presents the brake wet fading test procedure and correlation measurements with road tests. Results of the new brake test procedure show good agreement with those from on-road measurements, with a deviation of less than 3% in friction coefficient. With this level of accuracy achieved and a superior reproducibility, the tests in the FKFS Thermal Wind Tunnel for brake wet fading can be considered an improved alternative to on-road tests – in dry and wet conditions.


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    Titel :

    Test Procedure Development and Validation for Brake Wet Fading in the FKFS Thermal Wind Tunnel


    Weitere Titelangaben:

    Proceedings


    Beteiligte:
    Pfeffer, Peter E. (Herausgeber:in) / Schramm, Domenik (Autor:in) / Bernhard, Adrian (Autor:in) / Wiedemann, Jochen (Autor:in) / Wagner, Andreas (Autor:in) / Altseimer, Lars (Autor:in)


    Erscheinungsdatum :

    2021-06-15


    Format / Umfang :

    19 pages





    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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