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Accuracy of Sensor-Less Control of an Electro-Mechanical Brake
Technical Paper
2015-01-2704
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
At first glance a friction brake should be controlled by normal force to produce predictable brake force. Controlling an actuator (and hence brake pad) position basically seems to introduce uncertainties to normal force and brake force, because at first view the position tells little about actual normal force.
The electro-mechanical brake (EMB) of Vienna Engineering (VE) can be operated by position-control, either without force sensor (saving costs) or even with a true brake torque sensor. For position control a relation between actuator position and normal force is used. When pad wear is correctly adjusted a certain actuator position produces a given deformation and at known elasticity the deformation produces a defined normal force. In the VE-EMB this relation uses a three-dimensional curve and includes temperature influence of the coefficient of friction, thermal expansion and thermal elasticity change.
The temperatures for this control can't directly be measured at normal vehicles, but an accurate model that can be easily calculated in a low speed processor loop at the brake controller is possible.
Position control showed to be an useful control method for the VE-EMB and even has advantages to force-control (as e.g. used at conventional brakes): when actuation losses in a force controlled system increase then the real normal force is lower than expected, reducing the accuracy of brake force. With a position controlled brake the actuation always goes to the same motor angle, always producing the same normal force in the brake.
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Authors
Citation
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, https://doi.org/10.4271/2015-01-2704.Also In
References
- 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
- Putz , Michael and Maier , Rainer Auto-release at an Electro Mechanical Brake at power-off; Vienna Engineering 6th European Conference on Braking JEF 2010
- 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 , 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. , 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 , 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
- International Organization for Standardization ISO 26262 Road vehicles-Functional safety
- Hartley , J. , Day , A. , Campean , I. , McLellan , R. et al. Braking System for a Full Electric Vehicle with Regenerative Braking SAE Technical Paper 2010-01-1680 2010 10.4271/2010-01-1680
- Proposal for a Regulation of the European Parliament and of the Council setting emission performance standards for new passenger cars as part of the Community's integrated approach to reduce CO2 emissions from light-duty vehicles /* COM/2007/0856 final - COD 2007/0297 */
- YAMASAKI , Tatsuya ; EGUCHI , Masaaki ; MAKINO , Yusuke Development of an Electromechanical Brake NTN TECHNICAL REVIEW No.75 2007