• Title, Summary, Keyword: Antilock Brake System

Search Result 21, Processing Time 0.245 seconds

Design of a Servo Controller for Antilock Brake Systems Based on the Automotive Tire Model (차륜 모델에 기초한 차량 ABS의 서보 제어기 설계)

  • Hwang, I-Cheol
    • Journal of Power System Engineering
    • /
    • v.19 no.3
    • /
    • pp.42-47
    • /
    • 2015
  • This paper studies on the design of a servo controller for an antilock brake system(ABS) based on the car tire model. First, a nonlinear differential equation of the car tire is constructed and its linearization model is obtained by Taylor's series. Second, a servo controller based on the mathematical model is analytically designed to obtain the maximum brake force, where the tire velocity and the slip ratio of car tire are respectively controlled to the given command values. Third, it is theoretically shown that the proposed control algorithm has good usefulness in ABS.

Variable Parameter Sliding Controller Design for Vehicle Brake with Wheel Slip

  • Liang, Hong;Chong, Kil-To
    • Journal of Mechanical Science and Technology
    • /
    • v.20 no.11
    • /
    • pp.1801-1812
    • /
    • 2006
  • In this paper, a 4-wheel vehicle model including the effects of tire slip was considered, along with variable parameter sliding control, pushrod force as the end control parameter, and an antilock sliding control, in order to improve the performance of the vehicle longitudinal response. The variable sliding parameter is made to be proportional to the square root of the pressure derivative at the wheel, in order to compensate for large pressure changes in the brake cylinder. A typical tire force-relative slip curve for dry road conditions was used to generate an analytical tire force-relative slip function, and an antilock sliding control process based on the analytical tire force-relative slip function was used. A retrofitted brake system, with the pushrod force as the end control parameter, was employed, and an average decay function was used to suppress the simulation oscillations. Simulation results indicate that the velocity and spacing errors were slightly larger than the results that without considering wheel slip effect, the spacing errors of the lead and follower were insensitive to the adhesion coefficient up to the critical wheel slip value, and the limit for the antilock control on non-constant adhesion road condition was determined by the minimum of the equivalent adhesion coefficient.

Vehicle Longitudinal Brake Control with Wheel Slip and Antilock Control (바퀴 슬립과 잠김 방지 제어를 고려한 차량의 종렬 브레이크 제어)

  • Liang Hong;Choi Yong-Ho;Chong Kil-To
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.11 no.6
    • /
    • pp.502-509
    • /
    • 2005
  • In this paper, a 4-wheel vehicle model including the effects of tire slip was considered, along with variable parameter sliding control, in order to improve the performance of the vehicle longitudinal response. The variable sliding parameter is made to be proportional to the square root of the pressure derivative at the wheel, in order to compensate for large pressure changes in the brake cylinder. A typical tire force-relative slip curve for dry road conditions was used to generate an analytical tire force-relative slip function, and an antilock sliding control process based on the analytical tire force-relative slip function was used. A retrofitted brake system, with the pushrod force as the end control parameter, was employed, and an average decay function was used to suppress the simulation oscillations. The simulation results indicate that the velocity and spacing errors were slightly larger than those obtained when the wheel slip effect was not considered, that the spacing errors of the lead and follower were insensitive to the adhesion coefficient up to the critical wheel slip value, and that the limit for the antilock control under non-constant adhesion road conditions was determined by the minimum value of the equivalent adhesion coefficient.

Development of ABS ECU for a Bus using Hardware In-the-Loop Simulation

  • Lee, K.C.;Jeon, J.W.;Nam, T.K.;Hwang, D.H.;Kim, Y.J.
    • 제어로봇시스템학회:학술대회논문집
    • /
    • /
    • pp.1714-1719
    • /
    • 2003
  • Antilock Brake System (ABS) is indispensable safety equipment for vehicles today. In order to develop new ABS ECU suitable for pneumatic brake system of a bus, a Hardware In-the-Loop Simulation (HILS) System was developed. In this HILS, the pneumatic brake system of a bus and antilock brake component were used as hardware. For the computer simulation, the 14-Degree of Freedom (DOF) bus dynamic model was constructed using the Matlab/Simulink software package. This model was compiled and downloaded in the simulation board, where the Power PC processor was used for real-time simulation. Additional commercial package, the ControlDesk was used to monitor the dynamic simulation results and physical signal values. This paper will focus on the procedure and results of evaluating the ECU in the HILS simulation. Two representative cases, wet basalt road and $split-{\mu}$ road, were used to simulate real road conditions. At each simulated road, the vehicle was driven and stopped under the help of the developed ECU. In each simulation, the dynamical behavior of the vehicle was monitored. After enough tests in the laboratory using HILS, the parameter-tuned ECU was equipped in a real bus, which was driven and stopped in the real test field in Korea. And finally, the experiment results of ABS equipped vehicle's dynamic behavior both in HILS test and in test fields were compared.

  • PDF

Implementation and Tests of Antilock Braking Algorithm for a heavy vehicle

  • Lee, Ki-Chang;Jeongwoo Jeon;Donha Hwang;Kim, Yongjoo
    • 제어로봇시스템학회:학술대회논문집
    • /
    • /
    • pp.67.4-67
    • /
    • 2002
  • Antilock brake System (ABS) is a essential safety equipment for modern vehicles. It prevents wheels from being locked-up when emergency braking of a vehicle is required. So it can improves directional stability of the vehicle, shortens stopping distance. Heavy Vehicles such as trucks and buses use mainly pneumatic pressures for their braking systems, where pneumatic modulators control the flow rate of compressed air thus braking pressures in the wheels. In this paper, a antilock braking algorithm which is suitable for heavy vehicles was developed. This algorithm uses limit cycle of wheels and is implemented in the ABS ECU. The developed algorithm and ECU were tested in the labo..

  • PDF

A Study on the Implementation of Automatic parking brake system using In-Vehicle network (차량 네트워크를 이용한 자동 주차브레이크 시스템 구현)

  • 문용선;문창현;이명복;정철호;최형윤
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.8 no.3
    • /
    • pp.733-739
    • /
    • 2004
  • As per the recent technology related to safety of vehicles, Active safety system is being developed in combination withthe technology of electronic system. For example, ABC(Active Body Control), ABS(Antilock Brake System), ACC(Adaptive Cruise Control) are representative of this system. This technology is based on an electronic system, and shares a lot of data through network-system invehicles. Therefore, the control-algorism and the practicable application are realized in this research in order that CAN, network system for vehicles can run the brake device, which is composed mechanically and hand-operated. Additionally the possibility is confirmed that this control-system can be compatible with the existing electronic system in vehicles.

A Study on the Design of Electronic Control Unit for Antilock Brake System (전자제어식 미끄럼 방지 제동장치의 제어기 설계에 관한 연구)

  • Ha, Yeon-Chul;Cho, Jeong-Mok;Shin, Byung-Chul;Hwang, Don-Ha;Park, Doh-Young;Kim, Yong-Joo
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.2345-2347
    • /
    • 2000
  • ABS(Antilock Brake System) prevents the wheels from "locking" and improve "handling" during braking. Currently, safety and environmental issues are a major concern in the automotive industry. ABS has become the vital brake system. ABS is composed of sensors for wheel speed, a pressure modulator for controlling the brake pressures in the wheel brake cylinders, and an electronic control unit(ECU) which evaluates the signals from the wheel speed sensors and converts these to commands to control the pressure of modulator. In this paper, ECU developed for commercial vehicles is described. Detection of wheel slip, control algorithms of ABS, and diagnosis method of ECU are presented.

  • PDF

Development of HILS System for Performance Analysis of the ABS ECU for Commercial Vehicles (상용차용 ABS ECU의 성능분석을 위한 HILS 시스템 개발)

  • 황돈하;이기창;전정우;김용주;조정목;조중선
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.8 no.10
    • /
    • pp.898-906
    • /
    • 2002
  • Antilock Brake System (ABS) is designed to prevent wheels from being locked-up under emergency braking of a vehicle. Therefore it improves directional stability of the vehicle, shortens stopping distance, and enhances maneuvering during braking, regardless of road conditions. Hardware In-the-Loop Simulation (HILS) is an effective tool for design Performance evaluation and test of vehicle subsystems such as ABS, active suspension, and steering systems. This paper describes a HILS model for ABS/ ASR(Acceleration Slip Regulation) system applications. A fourteen degrees-of-freedom vehicle dynamics model is simulated in an alpha-chip processor board. The proposed HILS system is tested with a basic ABS control algorithm. The design and implementation of HILS system for the ABS ECU(Electronic Control Unit) development of commercial vehicle are presented. The results show that the proposed HILS system can be used to test the performance, stability, and reliability of a vehicle under braking.

Automotive Occupant Protection Technologies (차량용 탑승자 보호 기술)

  • Lee, Seongsoo
    • Journal of IKEEE
    • /
    • v.22 no.1
    • /
    • pp.223-226
    • /
    • 2018
  • Recently, various safety technologies have been extensively developed to protect occupants from accidents. This paper surveys various automotive occupant protection technologies such as antilock braking system, traction control system, electronic brake distribution, electronic stability control, autonomous emergency braking, airbag, seatbelt pretensioner, and active headrest. Their operation principles and implementations are also explained.

Evaluation of A Direct Yaw Moment Control Algorithm by Brake Hardware-In-The -Loop Simulation (브레이크HILS를 이용한 능동 요모멘트 제어 알고리즘의 평가)

  • 류제하;김호수
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.7 no.8
    • /
    • pp.172-179
    • /
    • 1999
  • This paper presents a simple but effective DYC algorithm which enhances vehicle lateral stability by using an anti=lock brake system (ABS). In the proposed algorithm, only the front outer wheel is controlled during cornering maneuver instead of controlling all four wheels because the wheel has the largest role in DYC and it is easy and simple to control the only one wheel. An ABS Hardware - In -The -Loop Simulation ( HILS) system that may be used to realistically test real vehicle dynamic behavior in a lab is used for evaluating the proposed DYC algorithm in severe situations where a vehicle is destabilized without DYC . The HILS results show that the proposed DYC algorithm has the potential of maintaining vehicle stability in some dangerous situations.

  • PDF