机械电子式无级变速器调速负载特性研究
发布时间：2019-06-03 02:41
【摘要】：金属带式无级变速器(CVT)因其结构简单、成本低廉、使用寿命长以及容易实现动力传动系的综合控制,能够充分地发挥发动机的特性,更好地提高汽车的燃油经济性、动力性、驾驶舒适性及行驶平顺性,所以一直是备受推崇的变速箱产品种类。然而,目前的无级变速器均采用液压系统对锥盘加压实现变速控制,在该产品的生产使用实践中,存在着三个主要问题：(1)液压系统的高能耗；(2)液压系统的高成本；(3)液压系统的低可靠性。本文所研究的是一种新近开发的具有自主完全知识产权的机械电子式无级变速器(Electronic Mechnical Continuously Variable Transmission),这种新型的无级变速器抛开了高能耗的泵、阀、液力变矩器,用能耗低的电机、齿轮、碟形弹簧加压对EMCVT调速。本课题来源辽宁省科学技术计划工业攻关重点项目资助,项目编号：2009220015,该项目名称是“车用无级变速器实验与控制关键技术攻关”。 本文的主要工作是： 通过现场试验充分了解EMCVT的调速机构,对其进行受力分析,研究影响调速负载的各种因素,建立调速负载的数学模型； 利用有限元软件Ansys分析调速机构的核心元件-—碟形弹簧的力学特性,并分析不同转速条件下对碟形弹簧力学特性的影响； 建立调速负载simulink的仿真模型,得出其特性曲线,定量或定性地分析不同因素对调速负载的影响程度,为以后的控制策略、方法的研制提供一些理论指导； 提出调速负载的优化模型,并利用复合型法对其优化,得出优化后碟形弹簧的参数以及优化结果； 提出新的CVT的速比变化率与汽车加速度的关系表达式和研究它们关系的分析方法,在现有研究的基础上提出一个关于汽车加速度与速比变化率之间关系的猜想,并且建立了EMCVT下速比变化率的数学模型,求解了该EMCVT的各个时刻的速比变化率。 通过本文工作得出了如下重要结论：在所选定的有效工作范围内,变速箱转速对碟形弹簧的力学性能影响很小,可以不做考虑；求解的调速负载的特性曲线不是很合理,由此提出调速负载的优化模型,优化结果对比以前调速性能有比较明显的优化作用,同时该优化思想可以应用到EMCVT的结构设计上；本文提出新的CVT的速比变化率与汽车加速度的关系表达式更简洁更合理有利于分析它们之间的关系。所提出的关于车加速度与速比变化率之间关系的猜想以及求解的EMCVT的速比变化率,为EMCVT控制策略中的速比控制实践提供一定的理论支持。
[Abstract]:Because of its simple structure, low cost, long service life and easy to realize the comprehensive control of power transmission system, metal belt continuously variable transmission (CVT) can give full play to the characteristics of engine and improve the fuel economy of automobile. Power, driving comfort and ride comfort, so it has always been a highly respected gearbox product category. However, the hydraulic system is used to control the conical disk pressure in the current stepless transmission. There are three main problems in the production and application of the product: (1) the high energy consumption of the hydraulic system, (2) the high cost of the hydraulic system, and (2) the high cost of the hydraulic system. (3) the low reliability of hydraulic system. In this paper, a newly developed mechanical electronic continuously variable transmission (Electronic Mechnical Continuously Variable Transmission),) with independent and complete intellectual property rights is studied, which puts aside the high energy consumption pump, valve and hydraulic torque converter. Use low energy consumption motor, gear, disc spring pressure to speed the EMCVT speed. This project comes from Liaoning Province Science and Technology Plan Industrial key Project support, project number: 2009220015, the project name is "vehicle continuously variable Transmission experiment and Control key Technology Research". The main work of this paper is: through the field test to fully understand the speed regulation mechanism of EMCVT, to carry on the force analysis to it, to study the various factors that affect the speed regulation load, and to establish the mathematical model of the speed regulation load; The mechanical properties of disc spring, which is the core element of speed regulation mechanism, are analyzed by using finite element software Ansys, and the influence of different rotating speed on the mechanical properties of disc spring is analyzed. The simulation model of speed regulation load simulink is established, its characteristic curve is obtained, and the influence degree of different factors on speed regulation load is analyzed quantitatively or qualitatively, which provides some theoretical guidance for the development of control strategy and method in the future. The optimization model of speed regulating load is put forward, and the parameters and optimization results of the optimized disc spring are obtained by using the compound method. A new expression of the relationship between the speed ratio change rate of CVT and the automobile acceleration is put forward and the analysis method of their relationship is studied. on the basis of the existing research, a conjecture about the relationship between the speed ratio change rate and the speed ratio change rate is put forward. The mathematical model of the downspeed ratio change rate of EMCVT is established, and the speed ratio change rate of the EMCVT at each time is solved. Through the work of this paper, the following important conclusions are drawn: in the selected effective working range, the speed of the gearbox has little effect on the mechanical properties of the disc spring, which can be ignored; The characteristic curve of the speed regulation load is not very reasonable, so the optimization model of the speed regulation load is put forward, and the optimization results have obvious optimization effect compared with the previous speed regulation performance. At the same time, the optimization idea can be applied to the structural design of EMCVT. In this paper, it is proposed that the new expression of the relationship between the speed ratio of CVT and the acceleration of automobile is more concise and reasonable, which is beneficial to the analysis of the relationship between them. The conjecture about the relationship between vehicle acceleration and speed ratio change rate and the speed ratio change rate of solved EMCVT provide some theoretical support for the practice of speed ratio control in EMCVT control strategy.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.46
[Abstract]:Because of its simple structure, low cost, long service life and easy to realize the comprehensive control of power transmission system, metal belt continuously variable transmission (CVT) can give full play to the characteristics of engine and improve the fuel economy of automobile. Power, driving comfort and ride comfort, so it has always been a highly respected gearbox product category. However, the hydraulic system is used to control the conical disk pressure in the current stepless transmission. There are three main problems in the production and application of the product: (1) the high energy consumption of the hydraulic system, (2) the high cost of the hydraulic system, and (2) the high cost of the hydraulic system. (3) the low reliability of hydraulic system. In this paper, a newly developed mechanical electronic continuously variable transmission (Electronic Mechnical Continuously Variable Transmission),) with independent and complete intellectual property rights is studied, which puts aside the high energy consumption pump, valve and hydraulic torque converter. Use low energy consumption motor, gear, disc spring pressure to speed the EMCVT speed. This project comes from Liaoning Province Science and Technology Plan Industrial key Project support, project number: 2009220015, the project name is "vehicle continuously variable Transmission experiment and Control key Technology Research". The main work of this paper is: through the field test to fully understand the speed regulation mechanism of EMCVT, to carry on the force analysis to it, to study the various factors that affect the speed regulation load, and to establish the mathematical model of the speed regulation load; The mechanical properties of disc spring, which is the core element of speed regulation mechanism, are analyzed by using finite element software Ansys, and the influence of different rotating speed on the mechanical properties of disc spring is analyzed. The simulation model of speed regulation load simulink is established, its characteristic curve is obtained, and the influence degree of different factors on speed regulation load is analyzed quantitatively or qualitatively, which provides some theoretical guidance for the development of control strategy and method in the future. The optimization model of speed regulating load is put forward, and the parameters and optimization results of the optimized disc spring are obtained by using the compound method. A new expression of the relationship between the speed ratio change rate of CVT and the automobile acceleration is put forward and the analysis method of their relationship is studied. on the basis of the existing research, a conjecture about the relationship between the speed ratio change rate and the speed ratio change rate is put forward. The mathematical model of the downspeed ratio change rate of EMCVT is established, and the speed ratio change rate of the EMCVT at each time is solved. Through the work of this paper, the following important conclusions are drawn: in the selected effective working range, the speed of the gearbox has little effect on the mechanical properties of the disc spring, which can be ignored; The characteristic curve of the speed regulation load is not very reasonable, so the optimization model of the speed regulation load is put forward, and the optimization results have obvious optimization effect compared with the previous speed regulation performance. At the same time, the optimization idea can be applied to the structural design of EMCVT. In this paper, it is proposed that the new expression of the relationship between the speed ratio of CVT and the acceleration of automobile is more concise and reasonable, which is beneficial to the analysis of the relationship between them. The conjecture about the relationship between vehicle acceleration and speed ratio change rate and the speed ratio change rate of solved EMCVT provide some theoretical support for the practice of speed ratio control in EMCVT control strategy.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.46
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