• 오토저널
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• 제26권5호
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• pp.11-16
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• 2004

• 실천공학교육논문지
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• 제7권2호
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• pp.119-123
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• 2015

ABS 소재는 가공이 쉽고 충격과 열에 대한 내성이 강해 가전제품뿐만 아니라 자동차용 내외장재 금속 대체용으로도 많이 사용되고 있다. 이러한 특성으로 ABS의 수요가 늘어감에 따라 ABS를 이용한 가공교육도 그 중요성이 커지고 있다. 그 교육의 일환으로 전국 기능대회 및 지방 기능대회 금형 가공 부분에서 ABS 소재가 쓰이고 있다. 이때 ABS 소재를 이용한 가공에 있어서 ABS 소재를 고정하는 바이스의 힘은 가공 후 최종 형상에 영향을 미치게 된다. 하지만 가공 교육 작업 주의사항이나 지시사항 등에 이에 관한 정확한 명시가 되어있지 않은 상황이다. 따라서 이번 연구에서는 ABS 소재를 이용한 가공 교육에 있어서 교육에 사용하는 기초 형상에 대한 바이스의 고정시키는 힘이 가공 후 최종 형상에 미치는 영향을 알아보고, ABS 소재의 가공 교육 시 적합한 바이스 주의사항을 제시하고자 한다.

• 한국안전학회지
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• 제32권5호
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• pp.13-19
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• 2017

In this paper, study of vehicle fire cases caused by connector and power wiring of anti-lock brake system(ABS) module damage is presented. The purpose of ABS module is to improve braking and steering ability under sudden stop of the vehicle by repeatedly activating and releasing the brake with electric signal via electric control unit. The electric control unit for ABS may experience incomplete contact between power line and signal line or electrical breakdown on the printed circuit board by undergoing repetitive signal change which would consequently result in electrical heat and spark, eventually leading to automotive fire. Therefore, the purpose of this paper is to provide fundamental data by analyzing connector and power wiring of ABS module damage conducive to the precise investigation on the cause of vehicle fire.

• Smart Structures and Systems
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• 제8권5호
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• pp.501-524
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• 2011

Recent studies have discovered that a conventional passive isolation system may suffer from an excessive isolator displacement when subjected to a near-fault earthquake that usually has a long-period velocity pulse waveform. Semi-active isolation using variable friction dampers (VFD), which requires a suitable control law, may provide a solution to this problem. To control the VFD in a semi-active isolation system more efficiently, this paper investigates experimentally the possible use of a control law whose control logic is similar to that of the anti-lock braking systems (ABS) widely used in the automobile industry. This ABS-type controller has the advantages of being simple and easily implemented, because it only requires the measurement of the isolation-layer velocity and does not require system modeling for gain design. Most importantly, it does not interfere with the isolation period, which usually decides the isolation efficiency. In order to verify its feasibility and effectiveness, the ABS-type controller was implemented on a variable-friction isolation system whose slip force is regulated by an embedded piezoelectric actuator, and a seismic simulation test was conducted for this isolation system. The experimental results demonstrate that, as compared to a passive isolation system with various levels of added damping, the semi-active isolation system using the ABS-type controller has the better overall performance when both the far-field and the near-fault earthquakes with different PGA levels are considered.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.170.3-170
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• 2001

Antilock brake system(ABS) prevent the wheels of road vehicle from locking up and skidding so that the braking force is from static friction instead of kinetic friction. Therefore ABS helps drivers maintain steering control during breaking situation particularly at an emergency stopping situation. So when trying to stop the road vehicle it is best to have the most friction possible for faster deceleration ABS keep the wheels turning which means there is more friction between the tires of vehicles and the road surface. Because of this advantage, ABS are now a commonly installed feature for passenger's safety in road vehicles. In this study, hydraulic system of ABS of vehicle is composed of 3port-2position solenoid valve. In order to minimize ...

• 한국정밀공학회지
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• 제23권4호
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• pp.44-51
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• 2006

This paper addresses sliding mode control of the anti-lock braking system (ABS) with a disturbance observer for model uncertainties such as vehicle parameter variation, un-modeled dynamics, and external disturbances. By using a nominal vehicle model, a sliding mode controller is designed to achieve a desired wheel slip ratio for ABS control. To compensate the model uncertainties, a disturbance observer is introduced with the help of a transfer function of a hydraulic brake dynamics. A proposed sliding mode controller with a disturbance observer is evaluated through simulations for model uncertainties. The simulation results show that the disturbance observer can enhance performances of sliding mode control for ABS.

• 한국자동차공학회논문집
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• 제21권1호
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• pp.78-85
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• 2013

This paper presents the sliding mode control methods for anti-lock brake system (ABS) with the friction force observer. Using a simplified quarter car model, the sliding mode controller for ABS is designed to track the desired wheel slip ratio. Here, new method to find the desired wheel slip ratio which produces the maximum friction force between road and tire is suggested. The desired wheel slip ratio is varying according road and tire conditions to produce maximum friction force. In order to find optimum desired wheel slip ratio, the sliding mode observer for friction force is used. The proposed sliding mode controller with observer is evaluated in simulation, and the control design is shown to have high performance on roads with constant and varying adhesion coefficients.

• 전기학회논문지
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• 제59권11호
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• pp.2083-2088
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• 2010

It is necessary to carry out quantitative analysis for the ABS hydraulic modulator to upgrade the system performances. Mathematical modeling method for the ABS hydraulic modulator, is suggested in the view of electromagnetism and fluid mechanics. Also, an analytic method is proposed for the resultant forces of electromagnetism and hydraulic pressure generated in the real vehicle ABS. The relationships between the design factor of Inlet & outlet solenoid valve and the system performance of ABS, are investigated through the analytical precess.

• 오토저널
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• 제24권2호
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• pp.108-113
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• 2002

• Korean Chemical Engineering Research
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• 제52권3호
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• pp.382-387
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• 2014

본 연구에서는 PC/ABS 블렌드를 고속전단성형법을 사용하여 제조하였고 스크류 회전속도와 전단부하시간을 공정 변수로 하여 이에 따른 블렌드의 모폴로지 변화를 분석하였다. 블렌드의 모폴로지 및 ABS 분산상의 크기를 주사전자현미경으로 관찰하여 안정한 상 구조와 최적의 물성을 가지는 고속전단성형조건을 확립하였고, 전단응력에 의한 블렌드의 열화 현상을 알아보기 위해 기계적 물성의 변화를 측정하였다. 이 때, 스크류 회전속도는 500 rpm에서 3000 rpm까지 변화시켰으며 전단부하시간은 10초에서 40초까지 주었다. 고속전단성형법을 사용하여 제조한 PC/ABS 블렌드 및 고속전단성형을 가하지 않은PC/ABS 컴파운드의 분산상 크기를 명확하게 관찰하기 위하여 블렌드의 단면에 크롬산 수용액을 이용한 에칭공정을 시행하였고 공정 전후의 모폴로지를 비교 분석하였다. 에칭으로 생긴 블렌드 내의 ABS 홀을 이미지 측정 프로그램인 Image J를 이용하여 측정한 결과, 스크류 회전속도에 따라 그 크기가 감소하였으며 특히 1000 rpm 이상의 스크류 회전속도 하에서 제조된 PC/ABS 블렌드의 경우, 기계적 물성이 급격하게 감소하여 블렌드의 분해가 일어났음을 알 수 있었다. 결과적으로 PC/ABS 블렌드에 1000 rpm의 스크류 회전속도를 가한 경우, 나노미터 단위의 분산상을 가지며 가장 안정한 상구조를 관찰할 수 있었고 인장강도 및 신율도 상대적으로 높아서 PC/ABS 블렌드의 최적 고속전단성형조건이라 할 수 있다.