PUB - Hydro-mechanical closed-loop braking torque control - experimental investigation and influence analysis


Friction-based brakes find application in a great variety of technical systems. The best-known application is the use in vehicles. Because of its safety-relevance, regulations demand an uttermost reliability and repeatability for the brake.



Authors: Merkel, Philip Amos; Murrenhoff, Hubertus; Reinertz, Olivier; Schmitz, Katharina

A common problem of all friction-based brakes is their dependency on constantly fluctuating tribological conditions in the friction contact leading to effects such as brake fading. Typical counter measures take a purely passive approach, trying to optimize the tribological properties of the friction pairing. While noteworthy advances exit, the problem persists to limit brake performance. This paper proposes a completely different solution. A closed-loop braking torque control developed by the authors allows a higher utilization of the physical braking potential, an improved and more reliable braking process and the possibility to make use of cheaper, less optimized friction pairings.

In this paper, the experimental investigation of the newly developed control system is presented. Here, an advanced brake test rig is introduced and an extensive experimental and theoretical investigation of the behaviour of the brake system gives first insights into the possibilities and limitations of the novel closed-loop control system.

The results of experiments with the novel controlled system prove the functionality of the control system and allow for a final evaluation of the concept.