• Title, Summary, Keyword: Dugoff Tire Model

Search Result 4, Processing Time 0.038 seconds

Climbing Angle Estimation in Yawing Motion by UIO (UIO를 이용한 선회 시 등판각 추정)

  • Byeon, Hyeongkyu;Kim, Hyunkyu;Kim, Inkeun;Huh, Kunsoo
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.23 no.5
    • /
    • pp.478-485
    • /
    • 2015
  • Availability of the climbing angle information is crucial for the intelligent vehicle system. However, the climbing angle information can't be measured with the sensor mounted on the vehicle. In this paper, climbing angle estimation system is proposed. First, longitudinal acceleration obtained from gyro-sensor is compared with the actual longitudinal acceleration of the vehicle. If the vehicle is in yawing motion, actual longitudinal acceleration can't be approximated from time derivative of wheel speed, because lateral velocity and yaw rate affect actual longitudinal acceleration. Wheel speed and yaw rate can be obtained from the sensors mounted on the vehicle, but lateral velocity can't be measured from the sensor. Therefore, lateral velocity is estimated using unknown input observer with nonlinear tire model. Simulation results show that the compensated results using lateral velocity and yaw rate show better performance than uncompensated results.

A Study on Lateral Tire-road Friction Coefficient Estimation Using Tire Pneumatic Trail Information (타이어 뉴메틱 트레일 정보를 활용한 횡방향 타이어 노면 마찰 계수에 관한 연구)

  • Han, Kyoungseok;Choi, Seibum
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.24 no.3
    • /
    • pp.310-318
    • /
    • 2016
  • The demands for vehicle safety systems such as ABS and ESC have been increased. Accurate vehicle state estimation is required to realized the abovementioned systems and tire-friction coefficient is crucial information. Estimation of lateral tire-road friction coefficient using pneumatic trail information is mainly dealt in this paper. Pneumatic trail shows unique characteristics according to the wheel side slip angle and these property is highly sensitive to vehicle lateral motion. The proposed algorithm minimizes the use of conventional tire models such as magic formula, brushed tire model and Dugoff tire model. The pure side slip maneuver, which means no longitudinal dynamics, is assumed to achieve the ultimate goal of this paper. A simulation verification using Carsim and Simulink is performed and the results show the feasibility of the proposed algorithms.

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

A Study on Prevention of Secondary Collision considering Failure of Brake Actuator (제동 액츄에이터 손상을 고려한 2차 충돌 예방에 관한 연구)

  • Yang, Heecheol;Kim, Dooyong;Kang, Taewan;Soh, Minwoo;Kwon, Jaejoon;Park, Kihong
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.23 no.5
    • /
    • pp.553-563
    • /
    • 2015
  • Reportedly the fatality rate from secondary collision is six times higher than the average fatality rate from all traffic accidents. So prevention of the secondary collision is attracting significant attention from automotive industries. However, the secondary collision prevention systems that have been developed are not considering possibility of brake actuator failure that can occur by the impact during the initial collision. In this paper, a new system has been developed that could prevent secondary collision even in case of brake actuator failure by taking advantage of still operating actuators. In this system, a steering control is performed for maintaining a lane by using linear quadratic regulator. Additionally, the system attempts differential brake control with the remaining braking capability to stop the vehicle in the shortest distance. Through simulation in various collision scenarios, the system has demonstrated significant potential of preventing secondary collision that could otherwise have resulted in severe fatality.