摘要
针对传统电液式CVT速比控制系统存在的结构复杂、可靠性低等缺点,设计了CVT速比最优控制系统。采用PWM高速开关数字阀代替传统比例阀,建立了考虑电磁特性的PWM开关阀数学模型。简化CVT速比液压系统,建立了PWM阀控缸数学模型。应用离散系统二次型最优控制理论优化控制参数,设计了最优控制器。在Matlab环境下进行了起步加速、减速工况的CVT速比控制仿真试验。试验结果表明,所设计的CVT速比最优控制系统的稳态特性和动态特性良好,能够保证实际速比对目标速比的有效跟踪。
Aiming at the complicated structure and the lower reliability of the traditional electro hydraulic CVT ratio control system,a CVT ratio optimal control system is designed.The generally proportion valve is replaced with the PWM high speed on-off valve,and a mathematical model of PWM valve is built taking the magnetic characteristics of the valve into consideration.Then the CVT ratio control system is simplified to build a mathematical model of control cylinder for PWM valve.By applying optimal controls parameter of quadratic form theory of the discrete system,an optimal controller is designed.The simulation experiments for starting up and accelerating and decelerating are made under Matlab,which results show that the steady and the dynamic characteristics of the designed CVT ratio optimal control system are good with safeguarding of the effective track of the real ratio to the object ratio.
出处
《机械设计与制造》
北大核心
2011年第10期39-41,共3页
Machinery Design & Manufacture
基金
吉林大学农学部青年基金(4305050102D9)
