【作者】 杜晓强；

【导师】 宋锦春；

【作者基本信息】 东北大学 ， 机械电子工程， 2008， 硕士

【摘要】 车用无级变速器(Continuously Variable Transmission, CVT)可以使汽车发动机的使用功率特性尽可能的接近理想发动机的功率特性,从而达到燃油经济,低排放的目的,是未来轿车发展的主要方向。电控式金属带无级变速器(Electronic Continuously Variable Transmission, ECVT)为现在应用最广泛的CVT。随着现代工业自动化的影响,液压技术与计算机技术、电子技术的结合已成为必然趋势。这就促进了数字液压技术的产生与发展。高速开关阀是一种新型的液压元件,具有结构简单、价格低廉、对污染不敏感等优点。而且,不需D/A转换接口便可以实现与计算机技术的结合。高速开关阀的这些特点,为其在工业领域的广泛应用提供了可能。本文阐述了汽车无级变速器的概况,并详细阐述了CVT 160C的结构及原理,尤其是液压部分的组成及原理。在前人研究的基础上,通过现场研究与部分试验,在对CVTGL160C结构熟悉了解的基础上,作者设计了CVT PWM控制高速开关阀液压系统,采用了模糊自整定PID控制策略,并对其建模仿真分析。仿真结果表明,系统响应迅速,控制稳定、精确。和液压比例系统的仿真结果对比表明,高速开关阀液压控制系统及其模糊自整定PID的采用是优越的。更多还原

【Abstract】 Matching the usage power characteristic of engine with its ideal characteristic as soon as possible, The advanced technology of Continuously Variable Transmission (CVT), guarantee the low oil consumption and low exhaust emission, is the main develop orientation of automobile. Electronic Continuously Variable Transmission (ECVT) is the improved type of CVT which most broadly used now.With the development of the industrial automation, a combination of Hydraulic technology, computer technology and electronic technology has been an inevitable trend. So it caused the appearance and development of the digital hydraulic technology. High speed on/off valve (HSV) is a kind of new valve, Simple structure, low cost, non-sensitive to contamination and no need for D/A converter with the computer make it possible for widely used in the industrial.This paper introduced the CVT’s profile and the structure and principles of CVT GL160C, especially the composition and theory of the hydraulic sysyem. Based on the previous research and six months’tests in the factory, the author designed PWM control hydraulic system, modeled and simulated the system with Fuzzy-PID control method.The simulation showed that the system’s response is rapid, the control is stable and precision. Contrasting with the simulation results of the proportional hydraulic system shows that the high-speed on/off valve hydraulic control system and the fuzzy-PID control method is superior.更多还原