| In recent years, along with the energy problem, people begin to study focus on the electric cars which are more energy saving and environmental protection. As an important part of vehicle, suspension have great influence on vehicle handling stability and riding comfort, therefore, how to make use of the semi-active suspension control for electric cars to provide better performance, become the research content of this article, the research process is realized by experiments.Damping adjustable shock absorbers is the main component of a Semi-active suspension, this paper used a magnetorheological damper to build the test system. There are three main problems needed to be sloved in this process: Firstly, our country has not developed the standard of the unity of the change for the characteristics of magnetorheological damper at present, so we need to carry on the calibration experiment before using it. Secondly, according to its own characteristics of electric vehicles, a electric suspension with a quarter automobile model is established. The simulated body weight blocks can be increased or be reduced to simulate a car as the quality of the performance under different load. Thirdly, a suspension model is established in this paper, the process also needs a test environment to simulate the situation of the suspension in the process of various external incentives during working, at the same time it needs to collect the suspension of work parts of signals for analysis contrast. In addition, in order to apply the passive suspension of the electric car, passive suspension test of magnetorheological damper is not connected to the control current.There are many evaluation indexes for the performance of the suspension, but they are all around in the trade-off between stability and comfort. The experimental results show that due to damping variable the semi-active control suspension do better on vibration control under different excitation input by changing the size of the damping force. |
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