基于稳定性分析的电控离合器任务调度周期设计  

Task Scheduling Period Selection Based on Stability Analysis of Automatic Clutches

作　　者：程小宣 陈俐[1] CHENG Xiaoxuan;CHEN Li(Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China)

机构地区：[1]上海交通大学海洋工程国家重点实验室高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《上海交通大学学报》2019年第4期438-446,共9页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(51475284)资助项目

摘　　要：离合器接合过程在短时间内经过空行程、滑摩和锁止3个阶段,需要合理设计其电子控制器的实时任务调度周期,以避免离散化导致系统失稳,降低接合品质.基于实时调度与控制性能协同设计的思路,建立离合传动系统动力学模型及其闭环控制模型,采用z变换进行离散化,根据离散系统稳定性得到控制任务的临界调度周期,然后模拟计算不同任务调度周期对离合器接合过程冲击度、滑摩功的影响,并在传动台架上进行试验验证.结果表明,任务调度周期小于临界值时,离合器接合品质未见显著改变;但任务调度周期一旦超过临界值,接合品质急剧恶化.Clutch engagement process consists of three sequential phases, i.e., open, slipping and stick (locked). The task scheduling period of the clutch control task should be selected carefully in case that the improper discretization leads to instability and deteriorates the engagement quality. An integrated approach which considers both control performance and real-time scheduling aspects is applied to allocate task scheduling periods. Firstly, the model of a closed-loop control system for a powertrain with a clutch element is developed and discretized by z-transformation. The stability criterion of the discretized system during slipping phase is derived, thus, the critical task scheduling period can be determined. The engagement quality in terms of vehicle jerk and clutch frictional losses is evaluated by simulation data, further, the dynamic response is also tested on transmission dynamometers. The results show that, the clutch engagement quality is insensitive to the task period which is less than the critical value, however, is deteriorated seriously when the task period exceeds the critical value.

关 键 词：任务调度周期 离合器接合控制 稳定性 动态响应 

分 类 号：U163[交通运输工程]