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Electro Hydrostatic Actuator System Based on Active Stabilizer System for Vehicular Suspension Systems

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Abstract

The suspension systems of vehicles are being actively researched to improve steering stability and ride comfort of vehicles. Among these, the active stabilizer system exhibits improved steering stability and ride comfort during the turning of a vehicle by controlling the vehicle body roll through actuators mounted on the front and rear stabilizer bars. This paper proposes an active stabilizer system of the electrohydraulic drive type, which addresses the disadvantages of the conventional hydraulic drive type whose active stabilizer system has poor ride comfort and causes excessive energy loss due to the system structure. In this study, the electrohydraulic actuator system model is designed, and the dynamic characteristics of the vehicle are analyzed with a simple proportional-integral-derivative (PID) controller for controlling the roll angle of the vehicle through the active stabilizer depending on the application of the designed system. The designed hydraulic model and system are evaluated based on the dynamic characteristics of a vehicle fitted with the active stabilizer of the electrohydraulic drive type and analyzed using the interface-analysis method between MATLAB/Simulink and CarSim. Furthermore, the results of the simulation are compared with those from the bench test to evaluate the performance.

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Abbreviations

ẋ 1 :

vane type motor displacement

ẋ 2 :

vane type motor speed

ẋ 3 :

P1 is pressure values of chambers

ẋ 4 :

P2 is pressure values of chambers

A :

actuating area of vane type motor

V 01, V 02 :

original total volumes of two chambers

D :

the displacement of the pump

ω :

speed of the servo driven pump system

k leak + C t :

leakage constant

Q v1, Q v2 :

flow rates from two supplement check valves

M φ :

roll moment of vehicle

W b :

distance from right and left spring

M T :

twisting moment of stabilizer bar

φ :

roll angle

l :

moment of inertial of vehicle roll

F a :

force of vane type motor

F c :

centrifugal force of vehicle

m s :

load mass of stabilizer

m v :

sprung mass of vehicle

Δh :

distance from roll axis to CG of sprung mass

g :

gravity constant

k :

spring stiffness

Δh :

distance from roll axis to CG of sprung mass

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Authors and Affiliations

  1. School of Mechanical Engineering, University of Ulsan, 93, Daehak-ro, Nam-gu, Ulsan, 44610, South Korea

    Hyung-Gyu Park, Keun-Hui Jeong & Kyoung-Kwan Ahn

  2. Graduate School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, South Korea

    Myeong-Kwan Park & Seok-Hee Lee

Authors
  1. Hyung-Gyu Park
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  2. Keun-Hui Jeong
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  3. Myeong-Kwan Park
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Correspondence to Kyoung-Kwan Ahn.

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Park, HG., Jeong, KH., Park, MK. et al. Electro Hydrostatic Actuator System Based on Active Stabilizer System for Vehicular Suspension Systems. Int. J. Precis. Eng. Manuf. 19, 993–1001 (2018). https://doi.org/10.1007/s12541-018-0117-9

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  • DOI: https://doi.org/10.1007/s12541-018-0117-9

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