【作者】 孙辉；

【导师】 姜继海；

【作者基本信息】 哈尔滨工业大学 ， 机械电子工程， 2009， 博士

【摘要】 随着世界范围内工业技术的迅速发展,能源短缺和环境污染问题日趋严重,全球能源危机和环境恶化要求汽车工业发展节能环保型汽车。二次调节静液传动技术是一种新型的传动技术,该技术在恒压网络的基础上通过改变液压泵/马达的斜盘倾角,从而改变排量来适应负载的变化。利用液压泵/马达的四象限工作特性,能够有效地实现制动动能和重力势能的回收与再利用。液压储能系统功率密度大,全充和全放能力强,满足短时间车辆制动时的能量转换和储存要求。除此之外,静液传动技术还具有无级变速的精细速度调节、容易实现正反转、操控性强以及可靠性高等优点。因此,将二次调节静液传动技术应用于车辆传动系统中,对研究车辆的能量回收,减少环境污染以及提高车辆的整体性能具有重要意义。本文以二次调节静液传动技术应用于车辆传动系统中实现能量回收和再利用为主要内容,对二次调节静液传动车辆关键技术进行了全面深入的研究。在查阅大量国内外有关文献的基础上,本文概述了国内外能量存储技术的发展概况,对能量储能元件做了比较,分析了液压储能装置的优势和静液传动技术的特点,综述了国内外二次调节静液传动车辆的发展现状。阐述二次调节静液传动车辆的工作原理,分别建立静液传动车辆的数学模型和仿真模型。通过对比计算和仿真,分析了不同配置方式、循环工况及控制策略等因素对系统效率的影响。在此基础上提出了一种新型二次调节静液传动车辆的配置方式,提高了整车的传动效率和对复杂路面的适应性。通过对二次调节静液传动车辆的实际工程约束条件、整车性能设计指标及其与动力系统部件的相互影响进行分析,优化关键元件的匹配关系,完善静液传动系统的设计准则。仿真研究表明,基于自适应模拟退火遗传算法的多目标优化方法,能够根据不同的设计指标有效地识别出关键元件参数的最优解,提高系统的整体性能。针对静液传动技术功率密度大的特点,设计液压再生制动策略。根据制动强度和载荷的不同,合理地分配前后轴的制动力及再生制动力和摩擦制动力的比例关系,在确保车辆安全制动的同时,高效地回收车辆的制动动能。设计“功率跟随”+“恒温器”的综合控制策略,利用整车的仿真模型,优化能量利用策略的关键参数,并根据车辆载荷的不同动态调整控制策略的优化参数。仿真结果显示,能量利用策略保证发动机工作于高效区,有效地弥补了液压蓄能器能量密度小的缺点,避免了发动机的频繁起停,使节油率达到最高。根据驱动和制动系统的特点设计了转矩控制方式和转速控制方式,采用离散滑模变结构控制理论设计驱动和制动系统的鲁棒控制器,有效地抑制了系统参数大范围摄动、强非线性以及外界干扰的影响,提高车辆的控制性能。最后,利用搭建的二次调节静液传动车辆模拟试验平台,对本文相关的研究内容进行试验研究,并对试验结果进行分析。结果表明,转矩控制方式更适合于驱动和制动系统,并且验证了本文设计的鲁棒控制器、液压再生制动策略和能量利用策略的有效性。更多还原

【Abstract】 Along with the rapid development of industrial technology in the word, the increasingly serious problem of energy shortage and environmental pollution requires automobile industries all over the world exploring and developing energy saving and clean automobile. Hydrostatic transmission with secondary regulation is a new kind of transmission technology, which changes the swash angle of hydraulic pump/motor in the constant pressure network to adapt to the load change. Hydraulic pump/motor has the characteristic of four quadrant work, which can regenerate and reuse the inertial and gravitational energy of load. Hydraulic accumulator has the advantage of higher power density and the ability to accept the high rates and high frequencies of charging and discharging, both of which are favorable for energy conversion and storage requirements during vehicle braking. In addition, hydrostatic transmission with secondary regulation has the advantages of continuously variable speed adjustment, easy to achieve positive inversion and prevent overload of engine and so on. Therefore hydraulic hybrid technology is well suited for luxury passenger cars, sport utility vehicles, light duty trucks and heavy-duty trucks. It is undoubtedly important to apply secondary regulation to developing and exploring new hybrid vehicles to save energy and protect environment. Based on the application of secondary regulation technology in hybrid vehicles, series hybrid vehicles of hydrostatic transmission with secondary regulation are studied and analyzed in depth and breadth in this article.After consulting a lot of related literatures and reference materials at home and abroad, this paper summarizes and compares the properties of the different energy storage technologies. This paper also analyses the advantages of hydraulic energy storage system and the characteristics of hydrostatic transmission hybrid technology. Furthermore, summarizes the development of hydrostatic transmission hybrid vehicles at home and abroadAfter studying the operation principle of hydrostatic transmission hybrid vehicles, vehicle mathematical mode and simulation model were established. Furthermore, a new type of hydrostatic transmission hybrid system configuration was proposed to improve vehicle efficiency and adaptability to the complexity of the road on the basis of analysis of the factors influencing the system efficiency, such as difference configurations, driving cycles and control strategies.After the analyzing the interactive influence of hybrid vehicle actual engineering constraints, vehicle performance design target and power systemic components, the matching relationship of key components and design guideline of hydrostatic transmission hybrid vehicles were researched. Simulation studies have shown that adaptive simulated annealing genetic algorithm multi-objective optimization method effectively distinguishes the key components optimal parameters values, substantial improving the performance of hydrostatic transmission hybrid system.The hydraulic regenerative braking strategy was designed according to the large power density characteristics of hydrostatic transmission technology, which reasonably distributes the front/rear axle braking forces and the relationship between regenerative braking force and frictional braking force according to braking intensity. Hydraulic regenerative braking system and frictional braking system work together to brake safely, and effectively regenerate braking energy. The“power following”+“thermostat”energy distribution strategy was designed and optimized by using the simulation model. The simulation results have shown that the energy strategy ensure the engine work in high efficiency area, effectively overcome the lower energy density of hydraulic accumulator and avoid frequent start/stop of engine.As to deal with the robust control problems against parameter uncertainty and load disturbance, discrete sliding mode control method is employed to design the robust controller of hydraulic regenerative braking system.The experimental research was done using hydrostatic transmission hybrid test bed. The experimental results shown that torque control method is well suit for hydrostatic transmission hybrid system, discrete sliding mode robust controller is better than PID controller and hydraulic regenerative braking strategy and energy control strategy are quite effective.更多还原