This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Spring Assistance (Energy-Swing) in an Electro Mechanical Brake
Technical Paper
2017-01-2517
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
On Electro-Mechanical Brakes (EMB) spring-support can be necessary for releasing the brake without electrical energy. Advantageous brake-configurations can make use of the spring over the whole actuation range during engage and release.
Such optimized spring support is known as “energy-swing. Under loss-less conditions the spring force could be in permanent equilibrium with the force required to press the pad, i.e. the brake could be controlled without actuation energy. In reality this will not be fully achievable as actuation losses and different operational conditions need to be covered. Still, significant advantages can be gained.
The EMB of Vienna Engineering (VE) fulfills a key condition for energy-swing as it facilitates using the spring for engage- and release-support.
Car brakes must release automatically when power is off. Consequently, spring-induced engage-support must always be smaller than release-forces and release-support must ensure overcoming mechanical resistance. The VE-EMB can fulfill the requirements while maximizing the benefits by introducing a cam /rocker mechanism.
With realistic assumptions of losses, tolerances and operational influences the potential of the mechanism in terms of saving actuation energy, reducing actuator motor power and actuation timing improvement must be questioned. Besides, the related increase of complexity needs to be addressed.
This paper discusses the issues by comparing a VE-EMB without spring, the cam-rocker design and the simpler but less configurable lever-pushing method.
Recommended Content
Technical Paper | Energy and Timing Advantages of Highly Non-Linear EMB Actuation |
Technical Paper | Accuracy of Sensor-Less Control of an Electro-Mechanical Brake |
Technical Paper | The VE Electro-Mechanical Car Brake for Windmills (and Railways) |
Authors
Topic
Citation
Putz, M. and Zipper, T., "Spring Assistance (Energy-Swing) in an Electro Mechanical Brake," SAE Technical Paper 2017-01-2517, 2017, https://doi.org/10.4271/2017-01-2517.Also In
References
- Gombert , B. D. , Schautt , M. and Roberts , R. P. 2014 The Development of Alternative Brake Systems Encyclopedia of Automotive Engineering 1 11
- Hoeger , R. et. al 2011 Highly automated vehicles for intelligent transport 7th Framework programme ICT-2007.6.1 project, Final Report
- Ho , L. , Roberts , R. , Hartmann , H. , and Gombert , B. The Electronic Wedge Brake - EWB SAE Technical Paper 2006-01-3196 2006 10.4271/2006-01-3196
- Automotive Engineering April 2016 3 3
- Putz , M. , Seifert , H. , Zach , M. , and Peternel , J. Functional Safety (ASIL-D) for an Electro Mechanical Brake SAE Technical Paper 2016-01-1953 2016 10.4271/2016-01-1953
- Putz , M. , Seifert , H. , Zach , M. , Schiffer , M. et al. Accuracy of Sensor-Less Control of an Electro-Mechanical Brake SAE Technical Paper 2015-01-2704 2015 10.4271/2015-01-2704
- Putz , M. , Wunsch , C. , Schiffer , M. , and Peternel , J. Test Results of A Sensor-Less, Highly Nonlinear Electro-Mechanical Brake SAE Technical Paper 2014-01-2541 2014 10.4271/2014-01-2541
- Putz , M. , Wunsch , C. , Morgan , J. , Schiffer , M. et al. Energy and Timing Advantages of Highly Non-Linear EMB Actuation SAE Technical Paper 2013-01-2067 2013 10.4271/2013-01-2067
- Putz , M. , Wunsch , C. , and Morgan , J. The VE Electro-Mechanical Car Brake for Windmills (and Railways) SAE Technical Paper 2012-01-1796 2012 10.4271/2012-01-1796
- Putz , Michael ; Faul , Bernhard ; Wunsch , Christian ; Morgan , John E. The VE electromechanical brake with fully integrated actuators in a SUV class vehicle Vienna Engineering; Eurobrake 2012
- Putz , M. , Wunsch , C. , and Morgan , J. Wheel Optimized Brake Torque at the VE Mechatronic Brake SAE Technical Paper 2011-01-2358 2011 10.4271/2011-01-2358
- Putz , M. VE Mechatronic Brake: Development and Investigations of a Simple Electro Mechanical Brake SAE Technical Paper 2010-01-1682 2010 10.4271/2010-01-1682