Solving vehicle height using asymmetric damping switching to control vehicle body lifting and lowering
CAI Chen1, YAO Jialing1, TIAN Songmei2
1.College of Automobile and Traffic Engineering, Nanjing Forestry University, Nanjing 210037, China;
2.Research Institute of Automotive Engineering, Nanjing Automobile Group Limited Company, Nanjing 210028, China
Abstract：The balance position of vehicle body vibration with asymmetric damping will change. Inspired by this phenomenon, an idea and method of controlling the asymmetric switching of adjustable damping of semi-active suspension and using the vibration of suspension piecewise linear nonlinear system to lift the vehicle body is proposed. This idea and method provides a new theory and method for vehicle height and attitude control under the conditions of high-speed steering and emergency avoidance. To implement this height control, it is necessary to determine the corresponding relationship between vehicle body lifting height and asymmetric damping, vehicle speed and road input under different driving conditions. According to the characteristic that the transmission rate of piecewise linear nonlinear system is independent of the external excitation amplitude, the sinusoidal sweep excitation is carried out under a damping asymmetric working condition. The nonlinear system is linearized and its transfer function is obtained. The power spectral density of vehicle body lifting height is obtained by using the solution method of linear system, and then its root mean square value is obtained. Under the working conditions of different vehicle speeds, road input and asymmetric damping, the system is linearized and its transfer function is obtained, and then the lifting height of the vehicle body under random or harmonic road excitation is obtained. The mathematical model of the lifting height of the vehicle body and relevant working conditions parameters is established by the method of optimal fitting. The simulation shows that the mathematical model has high accuracy.
Key words: Adjustable damping damper; vehicle body lifting height; piecewise linear system; linearization method; vibration utilization
蔡琛1，姚嘉凌1,田松梅2. 利用非对称阻尼切换控制车体升降的车高求解研究[J]. 振动与冲击, 2022, 41(23): 36-42.
CAI Chen1, YAO Jialing1, TIAN Songmei2. Solving vehicle height using asymmetric damping switching to control vehicle body lifting and lowering. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(23): 36-42.
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