关键词: 车辆工程；连续天棚控制算法；中心复合有界设计；响应面法；乘坐舒适性和操纵稳定性

Abstract: The damping control co-simulation model for the semi-active suspension of the entire vehicle was established, based on continuous skyhook control algorithm within the adjustable damping coefficient range of CDC shock absorbers and vehicle muti-body dynamics model. To optimize the damping coefficient of the front and rear suspension skyhook of the control algorithm, the comprehensive evaluation index was established to balance ride comfort and handling stability, which was consisted of suspension vibration isolation index for continuous small and medium-sized excitations, suspension vibration reduction index for single pulse excitations, and suspension response index for angular step excitations. Secondly, the central composite bounded design was adopted to define DOE strategy, and a quadratic response surface model between the optimization variables and the comprehensive evaluation index was constructed by simulating and calculating the comprehensive evaluation index. The optimization objective was to minimize the comprehensive evaluation index, and the damping coefficients of the front and rear suspension skyhook after optimization were 5.39 and 3.61 Ns/mm, respectively. Finally, the proposed method was verified by simulation and comparison. It is verified that the optimized continuous skyhook control algorithm can significantly improve ride comfort on the premise of ensuring handling stability equivalent to passive suspension. Under continuous small and medium excitation, the suspension vibration isolation comfort is improved by 20.44%, and under single pulse excitation, the suspension impact comfort is improved by 56.67%.

Key words: vehicle engineering; continuous skyhook control algorithm; central composite bounded design; response surface methodology; ride comfort and handling stability