Hydraulic Fluid Temperature -Imposed Nonlinearities in Automotive Active Hydraulic Suspension Systems | ||
| JES. Journal of Engineering Sciences | ||
| Article 4, Volume 52, Issue 3, May 2024, Pages 87-104 PDF (2.04 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.21608/jesaun.2024.226034.1246 | ||
| Authors | ||
| yousra gazaz* 1; M-Emad Soliman2; Mahmoud Abdelrahim3; Aly S. Abo El-Lail2 | ||
| 1Egyptian German College in Assiut Misr International Technological University, Assiut, Egypt. | ||
| 2Dept. of Mechanical Engineering, Faculty of Engineering, Assiut University, Assiut 71516, Egypt | ||
| 3Assoc. Professor, Department of Mechatronics Engineering, Faculty of Engineering, Assiut University, 71516, Assiut, Egypt | ||
| Abstract | ||
| In hydraulic active suspension systems, an often overlooked source of nonlinearity is the performance deviation of the working hydraulic oil through the wide band of operating temperatures. In this paper, a quarter-car, Simulink® Simscape nonlinear hydraulic active suspension model has been constructed, taking ISO VG 22 oil as the working oil[29]. A PID controller has been tuned for the active suspension system. Targeted response parameters were tire deflection and suspension travel, as measures of vehicle handling, and sprung-mass acceleration as a measure of riding comfort. At a typical moderate vehicle speed of 40 km/hr, system response was investigated for both a single sinusoidal bump and a continuous wavy sinusoidal road inputs. Simulation was performed at two distant, extreme, operating temperatures, namely -30°C and 60°C. Results showed that at higher temperatures, the decrease in oil viscosity of the hydraulic actuator results in higher tire-rebound amplitudes and longer settling times, and a higher sprung mass acceleration amplitude, worsening both tire-road holding and ride comfort compared to those at -30°C. The most significant conclusion is that an active suspension’s hydraulic actuator actually behaves as a nonlinear damper, besides being a force generator. | ||
| Keywords | ||
| ISO VG 22 fluid viscosity; Hydraulic actuator; Active Vehicle Suspension; Nonlinear actuator dynamics; PID controller | ||
| References | ||
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