| RIDE PERFORMANCE ON WHEEL ROTATION SPEED DRIVEN CONTROLLED DAMPER SYSTEM
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| Hironobu Kikuchi , Kazuaki Inaba |
| Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology |
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| ABSTRACT |
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The trend in vehicle electrification has been increasing. However, the mass of the electric vehicle increases
with the battery size. Consequently, the ride and handling performance may be insufficient to meet user expectations. This
study aims to provide the value of the dynamic performance of electric vehicles. In a previous study, we proposed a skyhook
damping system that is driven by the wheel rotation speed signals. However, there was a problem of the feeling of a stiff ride
when applying the skyhook algorithm with a slow signal communication cycle. In this paper, we clarified the causes of an
incorrect damping coefficient switching timing, which excites the higher-order mode of the suspension system through a
numerical analysis. As a solution, we proposed a minimal control strategy that can achieve both body damping (1–2 Hz) and
isolation (3–6 Hz) through its smooth damping switching function under the limitation of a slow communication cycle of 20 ms.
The performance of the proposed algorithm showed a significant improvement based on a numerical analysis and vehicle
tests. As a limitation of the proposed algorithm, it has a fixed point near the sprung resonance frequency, a recommended
treatment for which is discussed herein. |
| Key Words:
Vehicle dynamics, Ride comfort, Semi-active suspension, Wheel rotation speed, Skyhook control, Electric vehicle
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Corresponding Author.
Hironobu Kikuchi , Email. 
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