• 한국산업융합학회 논문집
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• 제20권4호
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• pp.313-323
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• 2017

As vehicles become more intelligent this is focused on ways to enhance safety and convenience for both drivers and passengers. In particular, x-by-wire systems that replace rigid mechanical components with dynamically configurable electronic elements are being developed to expand intelligent functions, such as adaptive cruise control or lane departure warning system. Because the malfunction of safety-related modules controlling critical functions, such as brakes, throttle, and steering in x-by-wire systems, can cause injury or death, safety and reliability are the most critical issue for automotive vendors and parts manufacturers. In an effort to develop better and effective brake-by-wire system, this paper presents EMB system by using the low speed electric vehicle, which is not required large braking force, with motor controller. In addition, we design performance evaluation system of EMB with 1/4 low speed electric vehicle model and suggested EMB is evaluated through the performance evaluation system.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.111-111
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• 2000

The research of network system, being used to reduce automotive wiring harness, is reaching to the development of by-wire system. It is by-wire system that apply IVN(In-Vehicle-Network) to steering, braking system, and it has the advantage of mass-decreasing, easy to diagnose fault and so on. But until now, many developed device can't satisfied with reliability that system have ever had. So redundancy of each network module, i.e., It is only way to make backup module. This paper researches development of network module and redundancy management of backup module when error occurred for implementation of brake-by-wire system.

• 오토저널
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• 제26권1호
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• pp.21-28
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• 2004

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 D
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• pp.2155-2157
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• 2004

본 논문은 항공기용 Brake-By-Wire System 개발을 위한 설계 및 제작 그리고 시험에 관한 내용을 다루고 있다. 개발된 디지털제어기(Digital Control Unit)는 기본적인 제동기능 외에 Anti-skid 기능, Locked Wheel Protection 기능, Touchdown Protection 기능 등을 수행할 수 있다. 기능의 수행검중을 위해 실시간 HILS (Hardware In the Loop Simulation) 시험 및 Dynamometer 시험을 실시하여, 개발된 Brake-By-Wire System의 기능 및 성능을 확인하였다.

• International Journal of Automotive Technology
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• 제6권4호
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• pp.391-402
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• 2005

Despite its superior braking performance to conventional vehicles on test tracks, the performance of the ABS-equipped car seems disappointing on real highway. The poor braking performance results from questionable design of the human-machine interface(HMI) of the brake system. Force-displacement relation at the brake pedal has a strong effect on the braking performance. Recently developed brake-by-wire (BBW) system may allow us to tailor the force feel at the brake pedal. This study aims at exploring analytical ways of designing human-machine interface of BBW system. In this paper, mathematical models of brake pedal feel for electro-hydraulic BBW (EH-BBW) system are developed, and the braking motion and the characteristics of the driver's leg action are modeled. Based on the dynamic characteristics of the brake pedal and the driver, two new HMI designs for EH-BBW system are proposed. In the designs, BBW system is modeled as a type of master-slave teleoperator. The effectiveness of the proposed designs is investigated using driving simulation.

• 대한기계학회논문집A
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• 제34권10호
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• pp.1359-1366
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• 2010

최근 많은 전자제어기술이 개발되고 있으며 또한 차량에 적용되고 있다. 이러한 기술들 중 throttle-by-wire, brake-by-wire, steer-by-wire 와 같은 X-by-wire 가 대표적이며 이는 기계적으로 연결된 부분이 전기적인 신호나 액추에이터로 대체된 것이다. 본 논문에서는 스쿨존에서의 차량의 속도 제어를 위하여 throttle-by-wire, brake-by-wire 가 고려되었으며 특히 스쿨 존에서는 다른 지역에 비해 사고가능성이 높다. 그 이유는 보행자가 횡단 시에 다수의 운전자들이 규정속도를 지키지 않기 때문이다. 따라서 본 논문에서는 스쿨 존에서 규정속도 내로 주행하도록 throttle-by-wire, brake-by-wire 를 이용하여 차량을 감속 제어하였으며 이를 위하여 양산차량의 엔진과 변속기의 제원을 사용하였다. 둘째, 차량의 감속에 있어서 운전자와 승객이 불쾌감을 느낄 수 있는 급격한 감속을 줄이기 위하여 제안된 3 차 궤적 추종법을 적용시켰으며 궤적 추종을 위하여 퍼지-PID 제어를 사용하였다. 마지막으로 시뮬레이션을 통하여 제안된 차량의 감속 제어 시스템의 성능을 확인하였다.

• 한국정밀공학회지
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• 제21권11호
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• pp.171-178
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• 2004

This paper presents vibration characteristics of a wire cut discharge machine in which an electro-rheological brake actuator is used to control the wire tension. The ER brake actuator has several advantages including design simplicity, fast response time and real-time controllability. On the basis of the tension level required in the machine an appropriate size of the ER brake actuator is devised. The ER brake actuator is then incorporated with the machine and the field-dependent wire tension is experimentally evaluated. The straightness of the workpiece is also empirically investigated by changing the intensity of the electric field.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.717-720
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• 2000

Event-driven communication protocols such as CAN(Controller Area Network) have inherent packet delays due to the contention process for the use of network medium. These delays are stochastic in nature because most packets arrive at random time instants. The stochastic property of the delay adversely influences the control system's performance in terms of stability, responsiveness and steady-state error. Another problem for safety-critical application such as brake-by-wire systems is the reliability of the communication modules that can fail abruptly. This paper deals with two methods to overcome the above problems : (i) scheduling method that can maintain packet delays under some acceptable level, and (ii) redundancy management of communication modules that prescribes dual-redundancy modules' behavior when one of them fails.

• Journal of Electrical Engineering and Technology
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• 제12권3호
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• pp.1292-1298
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• 2017

In this paper, we represent a nonlinear identification of electronic brake pedal behavior in the brake-by-wire (BBW) system based on hybrid group method of data handling (GMDH) and genetic algorithm (GA). A GMDH is a kind of multi-layer network with a structure that is determined through training and which can express nonlinear dynamics as a mathematical model. The GA is used in the GMDH, enabling each neuron to search for its optimal set of connections with the preceding layer. The results obtained with this hybrid approach were compared with different nonlinear system identification methods. The experimental results showed that the hybrid approach performs better than the other methods in terms of root mean square error (RMSE) and correlation coefficients. The hybrid GMDH/GA approach was effective for modeling and predicting the brake pedal system under random braking conditions.

• 한국자동차공학회논문집
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• 제20권1호
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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.