• Transactions of the Korean Society of Automotive Engineers
• /
• v.20 no.1
• /
• pp.112-118
• /
• 2012

The electronic wedge brake is one of the brake-by-wire systems with a self-energizing effect. The electronic wedge brake has faster response than the conventional hydraulic brake and requires only about one-tenth the power to operate. However, the electronic wedge brake cannot be implemented unless the self-energizing effect is reliably controlled. The self-energizing mechanisms may result in unintentional lock up and are very sensitive to environment and parametric variations of the friction coefficient. In this study, the electronic wedge brake is modeled into dynamic equations, and a sliding mode controller is designed based on the model. The performance of the proposed controller is verified in simulations.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.12 no.4
• /
• pp.599-606
• /
• 2017

In this paper, the automatic control system of the stroller brake was designed and manufactured to reduce the safety accident of the stroller. The ultrasonic sensors are used to determine whether the handle of the driver's hand is touching or not, and the gyro sensor is designed to detect the current tilt of the baby carriage. If the next driver's hand is not recognized and the tilt exceeds a certain angle, the servo motor is activated and the hydraulic brake is operated to prevent the accident on the downhill road. Finally, in this paper, a smart phone-based application was developed to make the remote control of the brake possible.

• Information and Communications Magazine
• /
• v.34 no.5
• /
• pp.19-26
• /
• 2017

Electromechanical Brake(EMB)시스템은 유압 대신 전동식 액츄에이터를 이용하여 제동력을 발생시키는 브레이크 장치인 Brake-by-Wire(BBW) 시스템의 구성요소 이다. EMB 시스템은 기존 유압식 브레이크 시스템과 비교하여 친환경적이며, 설계의 자유도가 높고, 제동 응답성 및 제어 성능이 뛰어난 장점을 가진다. 하지만 전자 전기적으로 시스템 구성이 복잡해 짐에 따라 고장에 대한 안정성 부문이 설계시 충분히 고려되어야 한다. 본 논문에서는 차량 EMB 시스템 설계시 신뢰성을 향상을 위해 고려해야 설계 방안에 대해서 기술한다. 크게 시스템, 센서, 모터 분야에 대해 고장 요소 및 대처 방안 설계에 대해 개괄적으로 소개한다.

• Journal of Drive and Control
• /
• v.16 no.2
• /
• pp.36-42
• /
• 2019

The ESP (Electronic Stability Program) is an active control system that controls the posture of the vehicle by sensing the unstable state of the vehicle during braking, driving, or turning. The system works if the vehicle becomes unstable and it is very dangerous to develop it in the actual vehicle. For this reason, many studies have been carried out on the method of developing with simulation such as SIL / EIL. Some advanced companies have already applied it to the product development process. In this study, ESP hydraulic system and braking device model were constructed using SimulationX to build ESP SIL / EIL model. The hydraulic system model was constructed using the actual design parameters and the performance of the hydraulic model was verified by comparing with the actual vehicle test.

• Journal of the Korea Computer Industry Society
• /
• v.3 no.2
• /
• pp.141-148
• /
• 2002

In this paper, brushed servo control system for industrial robot is realized under GUI environment. Brushed servo motor has 400W capacities, 1000ppr optic encoder and electric brake load. Especially, driving unit is composed of full-bridge MOSFET semiconductors with 9540 and 540 FET ICs. Control unit has PIC 16C74 microprocessor［l,2,3], RS-232 communication ports, URD current sensor, and GAL 16R8ACN. Servo control system is controlled by PID control method[5,8］ with varying control parameters and load capacities. Brushed servo control systems which are proposed in this raper are applied to industrial robot control system.

• Proceedings of the KIEE Conference
• /
• 2004.07d
• /
• pp.2320-2322
• /
• 2004

전자제어식 미끄럼방지 제동장치 (ABS, Antilock Brake System)는 차량의 급제동시 발생할 수 있는 바퀴의 슬립을 방지하여 차량의 제동거리를 단축시키고 주행 성능을 향상시키는 차량 내 안전장치이다. 지난 몇 년 동안 공압식 제동시스템을 사용하는 대형차량에 적합한 미끄럼방지 제동 제어기를 연구해 왔다. 이 제어기는 바퀴의 슬립율과 그 변화량을 이용한 제어 법칙을 유도하여, 제어 파라미터로 사용하고 있다. 이러한 제어 파라미터의 튜닝에는 맡은 반복적인 실험이 요구된다. 이러한 요구에 부응하기 위하여 차량의 제동을 실시간으로 모사 할 수 있는 HILS (Hardware In-the Loop Simulation) 시스템을 개발, 구축하였다. 개발 HILS는 공압식 브레이크 시스템 및 14 자유도를 가지는 차량 동역학 모델 및 타이어-바퀴 동역학을 소프트웨어 모델로 사용하고, 개발 중인 전자제어식 미끄럼 방지 제동 제어기를 하드웨어로 사용하여, 바퀴속도 센서 신호 모의 장치 및 공압 엑추에이터 모의 신호등의 인터페이스 장치를 사용하여 제동중인 차량의 상태를 실시간으로 시뮬레이션 및 감시할 수 있다. 이 개발 HILS를 이용하여 제동 제어기의 제어 파라미터의 튜닝을 짧은 시간에 성공적으로 끝낼 수 있었을 뿐만 아니라, HILS 실험을 마친 제어기는 미끄럼 방지 제동 시험장에서 실차 주행 시험을 무사히 마침으로써, 개발 기간과 비용을 절감할 수 있는 하드웨어를 이용하는 시뮬레이션의 효용성을 간접적으로 증명하였다.

• Journal of Drive and Control
• /
• v.9 no.4
• /
• pp.8-13
• /
• 2012

Recently, researches about the eco-friendly vehicles such as hybrid electric vehicle, fuel cell vehicle and electric vehicle have been actively carried out. The regenerative braking system is a key technology to improve the vehicle energy utilization efficiency because it transforms the kinetic energy to the electric energy through the electric motor. This new braking system requires cooperative control between electric controlled brake and regenerative brake. Therefore, it is necessary to establish fault-diagnosis and fail-safe evaluation criteria to secure reliability of the regenerative braking system. In this paper, the failure types and causes in regenerative braking system were analyzed. The transient behavior characteristics were examined based on fault-diagnosis and fail-safe upon failure of regenerative braking system.

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

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.1528-1530
• /
• 2008

기존의 EPB 시스템에서는 제동력을 측정하기 위하여 hall effect force 센서를 이용하고 있지만, 이 센서는 비싼 가격과, 구조상 장착의 어려움 등의 문제점을 가지고 있다. 본 논문에서는 hall effect force 센서에 비해 저가이며, 기구적인 면에서 단순한 구조를 가지는 전류 센서만을 이용하여, 모터 유도 전류와 각가속도 정보를 획득하고, 이것을 이용하여 EPB 제동력을 추정하는 기법을 제안하고 실험을 통해 검증한다.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.18 no.4
• /
• pp.8-17
• /
• 2010

In this paper, a fault tolerant control against sensor faults of electric parking brake (EPB) is proposed. Fault tolerant control method of EPB system is strongly demanded since sensor faults can endanger a driver's safety. In this paper, a clamp force estimation method is presented using motor's armature current and angular velocity. Clamp force estimation method is applied for fault detection method with parity equations. The goal of the detection method is to detect and identify faults in encoder, current sensor, force sensor, and parking cable. And a switching logic for fault tolerant control against the three sensor faults is suggested. Experimental results show that the proposed force estimation method satisfies the specifications of EPB system. The effectiveness of the fault detection method is validated with experimental results. Although a single sensor fault happens, EPB system with the proposed fault detection method does not develop into a failure on subsystem or system level.