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A Study on Design for Noise Reduction of hEMB

Hyundai Mobis-Chihoon Jo, Jaeseung Cheon, Jongsung Kim, Yongsik Kwon
Published 2015-09-27 by SAE International in United States
EMB (Electro-Mechanical Brake) which converts electrical motor power to brake clamping force at each wheel is a system that has been investigated and developed by various automotive part suppliers through the years. In particular, as the number of electrically powered vehicles, such as hybrid electric vehicles, electric vehicles and fuel cell electric vehicles, has expanded, the EMB has received increased interest due to its fast response that is much suited for effective cooperative control with regenerative braking. However, issues such as cost competitiveness, reliability and regulations need to be solved for commercialization [1-2].A new concept, the hybrid Electro-Mechanical Brake (hEMB) is characterized by a dual piston structure linked by hydraulics inside of the caliper. It is possible to reduce the required motor power and increase the level of emergency back-up braking through the amplification effect of the dual piston mechanism [3]. The hEMB is composed of the caliper, dual pistons, spindle, gear actuator and motor. Here, the gear actuator acts to increase the torque generated by the motor. Although the motor is the source of…
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Electro-Mechanical Brake for Front Wheel with Back-up Braking

SAE International Journal of Passenger Cars - Mechanical Systems

Hyundai Motor Co.-Gab Bae Jeon, Jaehun Shim
MOBIS-Jongsung Kim, Chjhoon Jo, Yongsik Kwon, Jae Seung Cheon, Soung Jun Park
  • Journal Article
  • 2014-01-2538
Published 2014-09-28 by SAE International in United States
Electro-Mechanical Brake (EMB) is the brake system that is actuated by electrical energy and has a similar design with the Electric Parking Brake (EPB). It uses motor power and gears to provide the necessary torque and a screw & nut mechanism is used to convert the rotational movement into a translational one. The main difference of EMB compared with EPB is that the functional requirements of components are much higher to provide the necessary performance for service braking such as response time. Such highly responsive and independent brake actuators at each wheel lead to enhanced controllability which should result in not only better basic braking performance, but also improvements in various active braking functions such as integrated chassis control, driver assistance systems, or cooperative regenerative braking. Although the EMB system has the potential for numerous advantages and innovations in braking, it has yet to be successfully introduced in series production mainly due to safety and cost concerns. Recent studies have been made to investigate the functional safety aspects[1] and additional mechanical backup measures[2] in this…
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Multi-Objective Optimization and Robust Design of Brake By Wire System Components

SAE International Journal of Passenger Cars - Mechanical Systems

Hyundai MOBIS-Yongsik Kwon, Jongsung Kim, Jae Seung Cheon, Huyng-il Moon, Ho Joong Chae
  • Journal Article
  • 2013-01-2059
Published 2013-09-30 by SAE International in United States
A Brake By Wire (BBW) system is generally composed of electro-mechanical calipers at each wheel, a pedal simulator and a central controller. The brake demand is processed by the pedal and the central controller commands the brake distribution for each brake actuator. The highly responsive and independent brake actuators lead to enhanced controllability which should result in not only better basic braking performance, but also improvements in various active braking functions such as integrated chassis control, driver assistance systems, or cooperative regenerative braking.Although the BBW system has the potential for numerous advantages and innovations in braking, it has yet to be successfully introduced in series production mainly due to safety and cost concerns. Recent studies have been made to investigate the functional safety aspects and additional mechanical backup measures in this regard. Another area that needs to be considered is the optimization of key BBW system components to increase product competitiveness and cost effectiveness.In this study, optimization and robust design was carried out for the Electric Wedge Brake (EWB) caliper and the pedal simulator. First,…
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New Brake By Wire Concept with Mechanical Backup

SAE International Journal of Passenger Cars - Mechanical Systems

MOBIS-Jae Seung Cheon, Jongsung Kim, Jaehan Jeon
  • Journal Article
  • 2012-01-1800
Published 2012-09-17 by SAE International in United States
Brake-By-Wire (BBW) is a term used to describe next generation brake systems that rely on motor driven electro-mechanical calipers in place of conventional hydraulic components such as the booster, master cylinder, hydraulic unit, and parking brake. Instead the system configuration is simplified to a pedal simulator, electro-mechanical calipers that require no boosting, and electric control units. The active, highly-responsive, and independent control of the brake actuators at each wheel allows for great control flexibility and improved brake performance. It is also very well-suited for easy integration with cooperative regenerative braking and driver assistance functions.Although such potential and innovations have driven the interest and research into BBW systems through the years, it has yet to be successfully introduced in series production mainly due to the underlying perception of the lack of reliability of electronic components and overall cost concerns.In the current investigation, a new concept of BBW system is proposed as a step towards overcoming such hurdles. The proposed concept provides a mechanical backup function that does not deter the system from the original performance benefits…
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Brake By Wire Functional Safety Concept Design for ISO/DIS 26262

MOBIS-Jae Seung Cheon, Jongsung Kim, Jaehan Jeon, Sang Mok Lee
Published 2011-09-18 by SAE International in United States
The importance of functional safety design has recently grown with the increasing widespread application of electric/electronic (E/E) systems in today's automotive industry. Such E/E systems, usually composed of mechatronic actuators, various sensors, and electronic control units (ECU), have become too complex to be handled in the conventional quality management manner that was used for most predominantly mechanical applications.ISO/DIS 26262, an adaptation of the pre-existing IEC 61508 requirements specifically for the automotive industry, has been prepared as the global standard to meet such demands for a more structured and systematic approach to functional safety design. The functional safety concept design includes a hazard analysis and risk assessment phase that is based on ASIL (Automotive Safety Integrity Level) categorization. ASIL has four levels, A, B, C, and D, where A has the lowest risk and D has the highest.In this study, the concept phase of this ISO26262 standard for application to the Brake-by-Wire (BBW) system will be investigated. A BBW system is one in which the existing hydraulic system is replaced by motor driven electro-mechanical calipers. In…
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