• 제목/요약/키워드: Brake Pressure

검색결과 262건 처리시간 0.025초

제동압력 제한밸브의 모터싸이클 ABS에의 적용 (Application of a Brake Pressure Restriction Valve to a Motorcylce ABS)

  • 지동익;류제하;김호수;임재우;박종혁
    • 한국자동차공학회논문집
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    • 제9권2호
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    • pp.130-136
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    • 2001
  • This paper presents an of a brake pressure restriction valve to a motorcycle anti-lock brake system(ABS). In the conventional anti-lock brake system of automobiles, slip ratio as a control variable is actively controlled, which requires wheel speed sensors, ECU, and a pressure modulator. In the ABS valve that has been developed for use in motorcycles, however, the brake pressure that is close to the wheel locking pressure is preset by simple exercises and then the valve just allows to pass the wheel locking pressure and cutoff the remaining pressure. Simulation studies with a single wheel braking dynamics and lumped chassis model show that the pressure restriction valve has basic ABS functions as well as some robustness properties for the uncertain load and road conditions as well as various initial braking speeds. Field tests also show that the pressure restriction valve avoids the wheel locking effectively.

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전자식 차량 제동력 배분 시스템을 위한 퍼지제어기의 연구 (A Study on a Fuzzy Controller for the Electronic Braking Force Distribution System)

  • 김승대;김훈모
    • 한국자동차공학회논문집
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    • 제8권6호
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    • pp.220-229
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    • 2000
  • In the brake systems a proportioning valve which reduces the brake pressure at each wheel cylinder for anti-locking of rear wheels is closely related with the safety of vehicles. But, it is impossible for a present proportioning valve to exactly control brake pressure because mechanically it is an open loop control system. So, in this paper we describe a electronic brake pressure distribution system using a fuzzy controller in order to exactly control brake pressure using a close loop control system. The object of electronic brake pressure distribution system is to change an cut-in pressure and an valve slop of proportioning valve in order to obtain better good performance of brake system than with mechanical system.

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브레이크 압력 추정을 적용한 구동력 제어 (Traction Control with Brake Pressure Estimation)

  • 김세윤
    • 드라이브 ㆍ 컨트롤
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    • 제10권3호
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    • pp.1-6
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    • 2013
  • Traction control suppresses the spinning of the driven wheel during drive away or acceleration on slippery road condition. In this study, the estimation method of brake pressure hardly measured is proposed. The estimation method of brake pressure and the brake pressure control with pulse width modulation(PWM) are verified a good performance through experiment. Also, the vehicle simulation on slippery road conditions is validated the applicability of brake pressure control for traction control. The simulation results have showed that the brake pressure can be used the control variable for traction control.

Electronic Control of Braking Force Distribution for Vehicles Using a Direct Adaptive Fuzzy Controller

  • Kim, Hunmo;Kim, Seungdae;Sung, Yoon-Gyeoung
    • Journal of Mechanical Science and Technology
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    • 제15권1호
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    • pp.66-80
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    • 2001
  • In brake systems, a proportioning valve(P. V), which reduces the brake line pressure on each wheel cylinder for the anti-locking of rear wheels, is closely related to the safety of vehicles. However, it is impossible for current P. V. s to completely control brake line pressure because, mechanically, it is an open loop control system. In this paper we describe an electronic brake force distribution system using a direct adaptive fuzzy controller in order to completely control brake line pressure using a closed loop control system. The objective of the electronic brake force distribution system is to change the cut-in-pressure and the valve slop of the P. V in order to obtain better performance of the brake system than with mechanical systems.

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자동차용 미끄럼 방지 제동 장치의 동특성에 관한 시뮬레이션 연구 (A simulation study on the dynamics of an antiskid brake systems for automotive vehicles)

  • 김경훈;조형석;홍예선
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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    • pp.315-320
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    • 1988
  • This paper considers modelling and control of ABS(Anti-skid Brake System) which avoids dangerous wheel locking due to excessive brake pressure during the vehicle braking. The brake pressure is controlled by on and off's of solenoid valves via the variation of the wheel circumferential deceleration measured using tacho-sensors. The dynamic model between the brake pressure and the wheel acceleration of a vehicle is mathematically derived. The computer simulation shows that the threshold value of the on-off control is critical to the performance of the ABS.

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미끄럼 방지 제동장치용 유압모듈레이터의 압력 특성 해석에 관한 연구 (A Study on the Analysis of Pressure Characteristics of Hydraulic Modulator for Anti-Lock Brake System)

  • 송창섭;양해정
    • 한국정밀공학회지
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    • 제13권8호
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    • pp.120-127
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    • 1996
  • Anti-lock Brake System has been developed to reduce tendency for wheel lock and improve vehicle control during sudden braking on slippery road surfaces. This is achieved by controlling the braking pressure, avoiding wheel lock, while retaining handling and brake performance. This paper is concerned about pressurecharacteristics of hydraulic modulator. Experimental sets which is consists of hydraulic modulator, duty controller, pressure regulator, pressure senset is consuructed. System modelling and computer simulation are performed for comparison with experimental results. Brake wheel pressure are measured under various driving pulse. The result of experiment show fairly agreement with the simulation. As a result, it is known that wheel pressure is affected by duty ratio, orifice diameter through computer simulation.

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화물열차의 공기제동 압력 특성에 관한 실험적 연구 (Experimental Study on the Pressure Characteristics of Pneumatic Brake for Freight Train)

  • 남성원;문경호;이동형
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 춘계학술대회논문집B
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    • pp.593-598
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    • 2000
  • Experimental study is conducted to clarify the pneumatic characteristics of brake system for freight train. Empty-load and diaphragm brake systems are mainly installed in the freight trains owned by KNR(Korean National Railroad). Experimental train set is composed of sixteen freight train and one diesel locomotive that are now in use. From the experimental results, in case of commercial brake, empty-load brake system responds to the brake command more slowly than the diaphragm brake system. But, in case of release command, the response time of diaphragm brake system is shorter than that of empty-load one. In the emergency brake test, the decreasing rate of brake pipe pressure of tenth car is almost same that of decreasing rate of commercial brake service.

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디스크 브레이크의 편마모 방지를 위한 finger 안쪽면 윗 부분이 가공된 캘리퍼 하우징의 유한 요소 해석 (FEM Analysis of Caliper Housing Cut Inside Upper Face for Unbalance Wear Prevention of Disk Brake Pad)

  • 김남경;강종표
    • 한국기계가공학회지
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    • 제1권1호
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    • pp.89-100
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    • 2002
  • The purpose if this research was to improve the pressure distribution on the disk brake pad Not uniform pressure distribution on the disk brake pad generate the unbalance wear of it and the unbalance wear of disk brake pad generate vibration, noise, heat and reduce the braking capacity. For improve the pressure distribution on the pad in this research, upper face of caliper housing finger was cut. Two kinds of caliper which uncut and cut of finger face were compared the stress distribution by FEM analysis and real experiment. Also natural frequency and deforming displacement ware calculated. It was understood that pressure distribution could Improve by cut inside upper face of caliper housing finger.

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유한요소법을 이용한 드럼브레이크의 응력 및 온도 해석 (Stress and temperature analysis of a drum brake using FEM)

  • 함선균;이기수
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2001년도 춘계학술대회 논문집
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    • pp.707-710
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    • 2001
  • Brakes are one of the important safety parts in cars. The requirements of brakes in performance, in comfort, and working lifetime are high. This paper presents the static analysis on the stress and temperature of a automotive drum brake. The particular interest is the distribution of the contact pressure between brake lining and drum. The problems to be solved are the effects of friction coefficient, actuation force, temperature, and brake component's stiffness. The contact problem includes friction, and is solved using the ABAQUS.

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마찰면의 압력 분포를 고려한 제동디스크의 열응력 해석 (Thermal Stress Analysis for a Brake Disk considering Pressure Distribution at a Frictional Surface)

  • 이영민;박재실;석창성;이찬우;김재훈
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 추계학술대회 논문집
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    • pp.842-846
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    • 2005
  • A brake disk and a pad are important parts that affect the braking stability of a railway vehicle. Especially, because a brake disk stops the vehicle using conversion of the kinetic energy to frictional energy, thermal fatigue cracks are generated by the cyclic thermal load, as frictional heat, on a frictional surface and these cracks cause the fracture of a brake disk. Therefore, many researches for the thermal stress must be performed to improve the efficiency of brake disk and ensure the braking stability. In this study, we performed the thermal stress analysis for a ventilated brake disk with 3-D analysis model. For that, we simplified the shape of a ventilated hole to minimize problems that could be occurred in analysis process. Thermal stress analysis was performed in case that pressure distributions on a frictional surface is constant and is not. To determine pressure distributions of irregular case, pressure distribution analysis for a frictional surface was carried out. Finally using the results that were obtained through pressure distribution analysis, we carried out thermal stress analysis of each case and investigated the results of thermal stress analysis.

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