This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Test Results of A Sensor-Less, Highly Nonlinear Electro-Mechanical Brake
Technical Paper
2014-01-2541
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The electro-mechanical brake (EMB) of Vienna Engineering (VE) uses a highly non-linear mechanism to create the high pressing force of the pad. The advantage is that the pad moves very fast when the pad pressing force is low and moves slower with increasing pressing force.
The normal force in EMBs is often controlled by observing mechanical deformation to conclude to stress or force, commonly using strain gauges. It causes costs of the gauge itself and attaching them to e.g. the caliper and a sensitive amplifier. The full gauge equipment goes into the safety-related brake control system. The faintest damage (e.g. stone impacts, heat) gets the vehicle to the repair shop making expensive replacement necessary.
To avoid the costs of the force measurement in the safety related system VE took the electrical motor measurements from the very beginning of the brake development for EMB control. These electrical values (position, rpm, current, voltage) are already present to operate the brushless DC motor and need no additional parts.
In this paper a comparison is done between the effort to use force measurement and the sensor-less approach of VE. Safety concepts with gauges and without (using motor data) are discussed as well as long- and short term accuracy. With the constant torque of the non-linear VE EMB the motor current does not directly represent the force on the pad. In this paper it is discussed how normal force can be calculated in the non-linear brake.
The theory is compared with test stand results. The potential of improved algorithm for calculation is discussed.
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
Citation
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, https://doi.org/10.4271/2014-01-2541.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
- International Organization for Standardization ISO 26262 Road vehicles-Functional safety, parts 1 to 9
- International Electrotechnical Commission IEC 61508 Functional safety of Electrical/Electronic/Programmable Electronic Safety-related Systems, parts 0 to 7
- YAMASAKI, Tatsuya EGUCHI, Masaaki; MAKINO, Yusuke: Development of an Electromechanical Brake; NTN TECHNICAL REVIEW No.75 2007
- Park , Heeram ; Choi , Seibum Development of a Sensorless Control Method for a Self-Energizing Brake System Using Noncircular Gears IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY 21 4 JULY 2013