• Title/Summary/Keyword: Roll Stabilizer Bar

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Effects of an actuator attached to roll stabilizer bar on vehicle performance (롤안정바에 부착된 엑츄체이터가 차량의 성능에 미치는 영향 분석)

  • Sung, In-Chol;Kim, Keun-Soo;Yoo, Wan-Suk
    • Proceedings of the KSME Conference
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    • 2000.04a
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    • pp.649-654
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    • 2000
  • To analyze the effects of the front and rear roll stabilizer bar, five different models of roll stabilizer bar are simulated in this paper. It is shown that the stiffness change of the roll stabilizer bar is an effective way to alter the vehicle's roll gradient. Attaching an actuator at the roll stabilizer bar the vehicle's roll gradient can be controlled within error limits.

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A Study on the Performance Analysis of RSC (Roll Stability Control) for Driving Stability of Vehicles (차량 롤 주행안정성 향상을 위한 RSC (Roll Stability Control) 성능 해석에 관한 연구)

  • Kwon, Seong-Jin
    • IEMEK Journal of Embedded Systems and Applications
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    • v.17 no.5
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    • pp.257-263
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    • 2022
  • Active stabilizers use signals such as steering angle, yaw rate, and lateral acceleration to vary the roll stiffness of the front and rear suspension depending on the vehicle's driving conditions, and are attracting attention as RSC (Roll Stability Control) system that suppresses roll when turning and improves ride comfort when going straight. Various studies have been conducted in relation to active stabilizer bars and RSC systems. However, accurate modeling of passive stabilizer model and active stabilizer model and vehicle dynamics analysis result verification are insufficient, and performance result analysis related to vehicle roll angle estimation and electric motor control is insufficient. Therefore, in this study, an accurate vehicle dynamics model was constructed by measuring the passive/active stabilizer bar model and component parameters. Based on this, the analysis result with high reliability was derived by comparing the roll angle estimation algorithm based on the lateral acceleration and suspension of the vehicle with the actual vehicle driving test result. In addition, it was intended to accurately analyze the motor torque characteristics and roll reduction effects of the electric motor-driven RSC system.

Development of a CAE Technique for Vehicle Suspension Design -Roll Stabilizer Bar Modelling and Damper Design- (자동차 서스팬션의 설계를 위한 CAE 기법 개발 -롤안정바 모델링 및 댐퍼 설계-)

  • 김광석;길혁문;유완석
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.1
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    • pp.160-168
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    • 1998
  • In this paper. the Joint reaction forces in the suspension system of a passenger car are determined to calculate the deflections and stresses in the damper strut. A mathematical model of the Roll Stabilizer Bar(RSB) is developed to include the RSB forces in the dynamics analysis. Using these RSB forces, the variations of the damper forces and spring forces due to the wheel strokes are determined in a McPherson strut suspension. The graphs of shear force diagram, bending moment diagram, bending stress and deflections are drawn by the calculated joint reaction forces.

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Implementation of Roll Control System for Passenger Car (승용차의 차량 롤 제어를 위한 시스템 구현)

  • 장주섭;이상호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.5
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    • pp.20-26
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    • 1997
  • A System for reducing vehicle body roll by active control is developed. The stabilizer bar with hydraulic rotary actuator produces anti-roll moment which suppresses roll tendency. This reduction of roll improves the driving safety as well as the ride comfort. Vehicle test data shows considerable reduction of roll angle during steady-state turning. Also improvement of ride comfort is achieved by making the actuator freely rotatable, i.e. by connecting all chambers of actuator in normal driving conditions. A control algorithm using steering wheel angle and vehicle speed signal as input valve is applied. It is compared with signal of the G-sensor.

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Effects of Suspension Compliance and Chassis Flexibility in Handling Performance (현가장치의 유연성과 차체의 탄성효과가 조종안정성에 미치는 영향 분석)

  • Kang, Dong-Kwon;Yoo, Wan-Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.7
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    • pp.137-143
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    • 1997
  • In this study, handling simulation of a passenger car is carried out to see the effects of suspension compliance, roll stabilizef bar and chassis flexibility. The front suspension of the car is a MacPherson strut type and the rear suspension is a multi-link type. The following five DADS models are constructed and compared to verify the effects of suspension compliance and chassis flexibility during lane change. (1) Vdhicle model without hard point compliance and stabilizer, (2) Vehicle model with hard point compoiance, (3) Vehicle model with hard point compliance and stabilizer, (4) Vehicle model with hard point compoiance, stabilizer, and one vibration mode of the chaxxis. (5) Vehicle model with hard point compliance, stabilizer, and three vibration modes of the chassis. The result shows that hard point compliance and stabilizer are significant in roll angle, and the flexibility of the chassis affects the yaw angle and yaw rate.

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A Study on the Effects of Hysteretic Characteristics of Leaf Springs on Handling of a Large-Sized Truck (판스프링의 이력특성이 대형트럭의 조종성능에 미치는 영향에 관한 연구)

  • 문일동;오재윤
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.5
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    • pp.157-164
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    • 2001
  • This paper performs static and dynamic tests of a multi-leaf spring and a tapered leaf spring to investigate their hysteretic characteristics. In the static test, trapezoidal input load is applied with 0.1Hz excitation frequency and with zero initial loading conditions. In the dynamic test, sinusoidal input load is applied with five excitation amplitudes and three excitation frequencies. In these tests, static and dynamic hysteretic characteristics of the multi-leaf spring and the tapered leaf spring are compared, and, the effects of excitation amplitudes and frequencies on dynamic spring rate are also shown. In this paper, actual vehicle tests are performed to study the effects of hysteretic characteristics of the large-sized truck's handling performance. The multi-leaf spring or the tapered leaf spring is used in the front suspension. The actual vehicle test is performed in a double lane change track with three velocities. Lateral acceleration, yaw rate and roll angle are measured using a gyro-meter located at the mass center of the cab. The test results showed that a large-sized truck with a tapered leaf spring needs to have an additional apparatus such as roll stabilizer bar to increase the roll stabilizer due to hysteretic characteristics.

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Improving the Roll Stability of a Vehicle by H$_{\infty}$ Control (선회 조향시 강건 제어에 의한 롤 안정성 개선)

  • 김효준;양현석;박영필
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.3
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    • pp.92-99
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    • 2001
  • This paper presents a simulation study using a robust controller to improve the roll stability of a vehicle. The controller is designed in the framework of an output feedback H$_{\infty}$ control scheme based on the 3DOF linear vehicle model, solving the mixed-sensitivity problem to guarantee the robust stability and disturbance rejection with respect to parameter variations due to laden and running vehicle conditions. In order to investigate the feasibility of the active roll control system in a real car, its performance is evaluated by simulation in a 10DOF full vehicle model with actuator dynamics and tire characteristics.

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Study on Vehicle Dynamics Performance Evaluation of Electric Active Roll Control System for SUV (SUV 차량용 전동식 능동 롤 제어 시스템의 성능 평가 기술 연구)

  • Jeon, Kwang-Ki;Choi, Sung-Jin;Kim, Joon-Tae;Yi, Kyong-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.11
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    • pp.1421-1426
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    • 2012
  • Cornering maneuvers with reduced body roll and without comfort loss are important requirements for car manufacturers. An electric active roll control(ARC) system controls the body roll angle by using motor-driven actuators installed at the centers of the front and rear stabilizer bars. Co-simulation using the Matlab/Simulink controller model and the CarSim vehicle model was proposed to evaluate the performance of the ARC control algorithm. To validate the performance of the ARC actuator and system, bench tests and vehicle tests were proposed.

Development of a Computer Model for the Turning Maneuver Analysis of a Heavy Truck (대형 트럭의 선회 주행특성 해석을 위한 컴퓨터 모델의 개발)

  • 문일동;권혁조;오재윤
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.4
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    • pp.121-129
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    • 2000
  • this paper develops a computational model for the turning maneuver analysis of a cabover type heavy truck. The model having 42 degree-of-freedom is developed using ADAMS. Leaf springs used in the front and rear suspension systems are modeled by dividing it three links and joining them with joints. Force and displacement relationship showing nonlinear hysteric characteristics of the leaf spring is measured and modeled with an exponential function. A velocity and force relationship of a shock absorber is measured and modeled with a spline function. And a stabilizer bar is modeled using ADAMS beam element to consider a twisting and bending effect. To verify the developed model an actual vehicle test is performed in the double lane change course with 50kph and 60kph vehicle velocity. In the actual vehicle test lateral acceleration roll angle and yaw rate are measured, The tendency and peak-to-peak values of the actual vehicle test and simultion results are compared each other.

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