This content is not included in your SAE MOBILUS subscription, or you are not logged in.
VE Mechatronic Brake: Development and Investigations of a Simple Electro Mechanical Brake
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 10, 2010 by SAE International in United States
Annotation ability available
Scientists at the Austrian Institute of Technology (AIT), formerly Austrian Research Center, focused on investigating electro mechanical brakes (EMB) for automobiles. Research showed that EMBs can address brake distribution with regenerative and friction braking ("blending") at hybrid and electric cars due to the ability of the EMBs to be actuated as required (and do not automatically produce brake force at pedal activation).
The target was to develop an EMB with low actuation force and energy that is simple and reliable, rolls back to disengage when power is off and acts as a parking brake. Several solutions were considered (with and without self-amplification). A pivotal mechanism with very high transmission ratio using eccentricity emerged as a favorable solution.
Vienna Engineering (VE) took over and assumed the research during 2010. VE revealed that non-linear behavior facilitated low actuation forces at high braking torque and can use a controlled amount of self-amplification. Unwanted actuation friction was minimized with roller bearings in the pivotal mechanism. Due to this very low friction and that no screws are used for actuation, it can roll back to disengaged at power off. Since self-amplification is not dominating the behavior the brake cannot seize and the drive direction need not be adjusted.
A test-rig with reduced rpm proved that the brake can produce real-world torque of a mid-size passenger car. Mathematical behavior of the offset mechanism including non-linearity, self-amplification and unwanted actuation friction was tested in a comprehensive simulation which was compared for consistency with the test-rig. It simulated one brake in three conditions: normal friction, high friction (e.g., to simulate rust or dust on the disc) and with much reduced friction with softened brake pads (to simulate overheating). Simulations showed that all cases can be managed with actuation peak powers of about 180 W for full braking in 1/10th second.
Full dynamic testing at AIT has been undertaken with a dynamometer (315 kW, 3,000 min-₁ and 1,000 Nm continuous torque). The tests included comparison of reality and simulation, overheating and NVH tests.
|Technical Paper||Methodology for Determining the Process of Riveting Brake Linings for Heavy Commercial Vehicles|
|Technical Paper||Light Truck FRP Leaf Spring Development|
|Technical Paper||Objective Characterization of Vehicle Brake Feel|
CitationPutz, M., "VE Mechatronic Brake: Development and Investigations of a Simple Electro Mechanical Brake," SAE Technical Paper 2010-01-1682, 2010, https://doi.org/10.4271/2010-01-1682.
- Kim, J.G. Kim, M.J. Kim, J.K. “Developing of Electronic Wedge Brake with Cross Wedge,” SAE Technical Paper 2009-01-0856 2009 10.4271/2009-01-0856
- von Albrichsfeld, C. Karner, J. “Brake System for Hybrid and Electric Vehicles,” SAE Technical Paper 2009-01-1217 2009 10.4271/2009-01-1217
- Mahmoud, M. Sc. Khaled, R. M; Theoretical and experimental investigations on a new adaptive duo servo drum brake with high and constant shoe factor Fakultät für Maschinenbau der Universität Paderborn Juli 2005
- Putz, Michael Gruber, Manfred Self-Energizing Brake or Movement Carrier Device PCT WO 2009/062880 A1 22 Mai 2009
- Putz, Michael Wilfried, Kubinger Brake-by-Wire Test Bench for new self-amplified Disc Brakes Austrian Research Centers, ARC-IT-0193 December 2006
- SAE International Surface Vehicle Recommended Practice “Dynamometer Global Brake Effectiveness,” SAE Standard J2522 June 2003