• Transactions of the Korean Society of Automotive Engineers
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• v.20 no.1
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• pp.1-7
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• 2012

The brake-by-wire technology is a new automotive chassis system that allows standard braking operations by electronic components with lighter weights and faster response. The brake-by-wire units such as EMB (Electro-Mechanical Brake) are controlled by electronic sensors and actuators and, thus, the fault diagnosis is essential for implementation. In this study, a model-based fault diagnosis system is developed for the sensors based on the analytical redundancy method. The fault detection algorithm is verified in simulations for various faulty cases. A test bench is built including the EMB unit and the performance of the proposed fault diagnosis system is evaluated through the experiment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.10
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• pp.581-588
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• 2020

This study examined a brake pad wear compensation method for an Electro-Mechanical Brake (EMB) using the braking test device. A three-phase Interior Permanent Magnet Synchronous Motor (IPMSM) was applied to drive the actuator of an EMB. Current control, speed control, and position control were used to control the clamping force of the EMB. The wear compensation method was performed using a software algorithm that updates the motor model equation by comparing the motor output torque current with a reference current. In addition, a simple first-order motor model equation was applied to estimate the output clamping force. The operation time to the maximum clamping force increased within 0.1 seconds compared to the brake pad in its initial condition. The experiment verified that the reference operating time was within 0.5 seconds, and the maximum value of the clamping force was satisfied under the wear condition. The wear compensation method based on the software algorithm in this paper can be performed in the pre-departure test of rolling stock.

• The Transactions of the Korean Institute of Power Electronics
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• v.15 no.4
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• pp.335-341
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• 2010

The electric braking system obtains its braking force by a motor instead of the hydraulic brake which has been used in conventional automobile systems. Electric braking system is consisted of fewer numbers of components than hydraulic braking system, and it has effects of improved response and reduced braking distance for the ABS(Anti-lock Brake System) and ESC(Electronic Stability Control). This paper presents the BLAC motor drive system for Electro-Magnetic Brake(EMB). Proposed control system consists of the power converter for driving a motor and the digital control system for speed control, and the vector control is applied for fast torque response. It is verified through the simulation using Matlab/Simulink and experiment that the proposed BLAC drive system can be applied to EMB.