液力机械传动车辆模糊换挡策略研究

为实现车辆换挡操纵的自动化，在车辆模型及其工作原理的基础上，确立了液力机械传动车辆换挡控制的原则。等于模糊理论，建立了由基本模糊换挡策略和模糊修正模块所组成的模糊换挡控制方案，并进而设计了模糊换挡策略。仿真结果表明了所设计的模糊换挡策略的可行性和有效性。

Fuzzy Control Strategy of Hydro-mechanical Transmission of a Vehicle

Based on the dynamic model and the working elements of the hydro mechanical transmission vehicle, which consists of six power shift clutches and two reverse gears, a fundamentals of the shift control was established. By using the fuzzy control theory, a fuzzy shift scheme was developed in this paper to realize the automation of the manipulating. The strategy is composed of a basic fuzzy shift strategy, which sets the schedule according to the vehicle speed and throttle valve opening when the vehicle on the plane road, and a fuzzy modification module, in which the modifying intensity is used to adjust the basic fuzzy shift stragety when the vehicle on the ramp road. The modification process can be easily realized in a control system applying the modification intensity. A fuzzy shift strategy was designed and two driving cases were simulated, the one of them was that the vehicle run on a plane road starting from the bottom gear and accelerating process, the other on the muddy ramp road. The simulation results showed that the fuzzy shift strategy was effective and feasible.