23. Internationales Stuttgarter Symposium

Automobil- und Motorentechnik

4. - 5. Juli 2023

Session: CHASSIS SYSTEMS | | 14:30 - 15:00

Analysis of Brake-Drag in Disc Brakes on Vehicle-Level

Philipp Huchtkötter, Dr. Ing. h.c. F. Porsche AG

Analysis of Brake-Drag in Disc Brakes on Vehicle-Level Reducing residual drag torque of disc brakes is an increasingly focused topic in the brake development process. Since already a few newton meters of residual torque can lead to an increased road load and therefore reduce the range of BEV. In the light of the upcoming rollout of EU7-emission-standards (approx. 2025) the avoidance of every unnecessary brakepad to disc contacts is also reinforced for combustion-engine-vehicles’ brakes. As EU7 introduces brake-dust emission limits which are more challenging to meet by vehicles that cannot slow down brake-dust free through recuperation. The major research on brake drag is based on subsystem investigations using test benches with one brake (-corner) mounted to an inertia-dynamometer. While guaranteeing an appropriate accuracy, laboratory test bench conditions impede the transferability of the results to vehicle-level since important driving conditions especially wheel-forces are excluded. Against this background this paper is based on a full-vehicle approach determining brake-drag behavior of a series production car on a 3D vehicle dynamics test-bench. The main purpose is to analyze the impacts of the entirety of vehicle dynamics on brake-drag using one measuring setup while obtaining maximal transferability to real-driving use-cases.