Understanding the Actuation Point Stiffness of Electromechanical Drum Brakes

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Authors Abstract
Content
Electromechanically actuated drum brakes are one interesting option for the realization of brake-by-wire systems for future electric vehicles. A key characteristic for the design and control of electromechanical brake actuators is the actuation point stiffness, as this quantity relates the actuation force to the required actuator position. The various known approaches for the control of electromechanical brakes, which primarily focus on disc foundation brakes, typically rely on the stiffness curve at least to some extent. A transfer of these approaches to drum brakes is not straightforward, because the actuation point stiffness for drum brakes is much more complex compared to disc brakes. In particular, a strong hysteretic behavior is observed for the standing drum and a considerable change of the stiffness and hysteresis can be observed for the rotating drum. Although drum brakes have been used for decades these effects have not been thoroughly discussed in literature, yet. Hence, this article proposes a minimal model, which gives a fundamental understanding of the stiffness characteristics of drum brakes. The relation to measured stiffness curves is discussed in detail to provide an in-depth understanding of the drum brake behavior. Additionally, prospect is given to a reduced complexity model that is suitable for online identification and control.
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DOI
https://doi.org/10.4271/15-18-01-0002
Pages
14
Citation
Peter, S., Janhsen, M., Stümke, D., and Görges, D., "Understanding the Actuation Point Stiffness of Electromechanical Drum Brakes," SAE Int. J. Passeng. Veh. Syst. 18(1), 2025, https://doi.org/10.4271/15-18-01-0002.
Additional Details
Publisher
Published
Sep 24
Product Code
15-18-01-0002
Content Type
Journal Article
Language
English