A Study on Energy Harvesting by Using Hydraulic Suspension System in Electric Vehicles
Date Issued
2012
Date
2012
Author(s)
Sung, Yung-Ching
Abstract
Suspension systems are used to diminish the vibration of vehicles. The damping in suspension systems is mainly provided by the orifices of the hydraulic dampers so that the vibration energy can be reduced by the orifice and transferred into heat.
Recently, the hybrid drive vehicles and electric vehicles, which do not use gasoline, are more and more popular because of the energy consumption problem. Therefore, the higher and higher energy efficiency is in demand. If the wasted energy during the drive of vehicles can be recycled, the endurance of power can be highly enhanced.
The main purpose of this thesis is to develop a renewable energy system in electric vehicles by means of the hydraulic dampers, which combines a novel energy harvesting system and a semi-active vibration control. Instead of the constant orifice in the conventional hydraulic damper, a proportional valve is used in the hydraulic dampers to regulate the orifice for changing the damping force. Thus, the semi-active control can be developed. Meanwhile, the novel energy harvesting system mainly consists of a hydraulic motor and a DC generator. When the suspension system works under vibration, the oil of the hydraulic damper can drive the hydraulic motor, and the motor can then drive the generator. Therefore, the vibration energy can be recycled to the low voltage battery to enhance the energy efficiency.
This thesis first designs the energy harvesting system by using hydraulic suspension system in electric vehicles. Mathematical models are derived in accordance with the system design. Then Matlab/Simulink is used to develop the dynamic simulation. For semi-active vibration control, fuzzy sliding mode control is used to develop the controller. A test rig is also set up to confirmed the proposed concept. Through simulation of open-loop and closed-loop control, the energy harvesting system and semi-active control in the proposed system can be confirmed.
Subjects
electric vehicle
hydraulic damper
energy harvesting
semi-active control
dynamical simulation
SDGs
Type
thesis
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