大扭矩无级变速器实验箱电液控制系统设计与仿真
发布时间：2018-08-12 11:01
【摘要】：无级自动变速器(Continuously Variable Transmission,简称CVT)具有较宽的速比变化范围,通过连续无级的调节传动比,可以使发动机在汽车的任何工况下始终沿着最佳燃油经济曲线或最佳动力曲线工作,达到了节约燃油、简便操作、减少排放污染的目的。 现在,坦克等军用车辆其档位多达七档；重卡等工程用车其档位多达九档；另外,这些车辆的工作环境非常恶劣,体型大又要求有较好的运行灵活性。但是,目前应用最广泛的无级变速器-金属带式无级变速器,主要应用于小型轿车上,据最新的研究成果表明,12层的金属带可以可传递的最大扭矩为400N.M,这远不能满足这些重型大排量车辆的需求,所以急需要一款可以传递大扭矩的无级变速器。 摆销链式无级变速器已经应用于奥迪轿车中排量在2.0以上的车型中,是一种可以传递大扭矩的无级变速器；然而,能否提高摆销链的传递性能来实现大扭矩输出,还需要通过实验箱来测试并确定。另外,由于链式无级变速器摩擦发热非常严重,又具有多边形效应,变速器能否克服这些不利条件也需要实验手段来测试。 本课题首先介绍了大扭矩CVT的发展概况和工作原理,分析了国内外目前的发展现状和发展趋势,在原有研究成果基础上的深化,依据设计要求和针对大扭矩无级变速器的特点,设计了满足大扭矩传动要求的新型液压系统：用传递函数法建立了数学模型,并对其进行仿真分析,设计了满足高油温环境条件下工作的齿轮泵、管路和比例控制液压阀,并对液压系统的密封进行了细致的研究；最后建立了速比和压力的控制策略。 大扭矩CVT技术对于提高大排量车辆性能、尤其是工程车辆、军用车辆的驾驶性能和机动性能、提高汽车企业的产品竞争力具有十分重要的意义和广阔的应用前景。
[Abstract]:The stepless automatic transmission (Continuously Variable Transmission,) has a wide range of speed ratio changes. By continuously adjusting the transmission ratio, the engine can always work along the best fuel economy curve or the best power curve under any working condition of the automobile. It can save fuel, operate conveniently and reduce emission pollution. At present, tanks and other military vehicles have as many as seven stalls; heavy trucks and other engineering vehicles have as many as nine stalls; in addition, the working environment of these vehicles is very harsh and the size of these vehicles requires better operational flexibility. However, the most widely used CVT, metal belt CVT, is mainly used in small cars. According to the latest research results, the maximum torque of the metal belt with 12 layers can be transferred is 400N.M.This is far from meeting the demand of these heavy vehicles with large displacement, so a stepless transmission that can transmit large torque is urgently needed. The pendulum chain stepless transmission has been used in the Audi car with a displacement of more than 2.0. It is a stepless transmission that can transmit large torque. However, can the transmission performance of the pendulum chain be improved to achieve large torque output. It also needs to be tested and confirmed through the test box. In addition, because the friction heat of chain CVT is very serious and has polygon effect, it is necessary to test whether the transmission can overcome these disadvantages. This paper first introduces the development and working principle of large torque CVT, analyzes the present development situation and development trend at home and abroad, deepens on the basis of the original research results, according to the design requirements and aims at the characteristics of large torque stepless transmission. A new hydraulic system is designed to meet the requirements of large torque transmission. The mathematical model is established by transfer function method, and the simulation analysis is carried out. The gear pump, pipeline and proportional control hydraulic valve are designed to work under the condition of high oil temperature. The sealing of hydraulic system is studied in detail, and the control strategy of speed ratio and pressure is established. High torque CVT technology is of great significance and broad application prospect in improving the performance of large displacement vehicles, especially the driving performance and maneuverability of military vehicles, and improving the product competitiveness of automobile enterprises.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.46;TH137
本文编号：2178851
[Abstract]:The stepless automatic transmission (Continuously Variable Transmission,) has a wide range of speed ratio changes. By continuously adjusting the transmission ratio, the engine can always work along the best fuel economy curve or the best power curve under any working condition of the automobile. It can save fuel, operate conveniently and reduce emission pollution. At present, tanks and other military vehicles have as many as seven stalls; heavy trucks and other engineering vehicles have as many as nine stalls; in addition, the working environment of these vehicles is very harsh and the size of these vehicles requires better operational flexibility. However, the most widely used CVT, metal belt CVT, is mainly used in small cars. According to the latest research results, the maximum torque of the metal belt with 12 layers can be transferred is 400N.M.This is far from meeting the demand of these heavy vehicles with large displacement, so a stepless transmission that can transmit large torque is urgently needed. The pendulum chain stepless transmission has been used in the Audi car with a displacement of more than 2.0. It is a stepless transmission that can transmit large torque. However, can the transmission performance of the pendulum chain be improved to achieve large torque output. It also needs to be tested and confirmed through the test box. In addition, because the friction heat of chain CVT is very serious and has polygon effect, it is necessary to test whether the transmission can overcome these disadvantages. This paper first introduces the development and working principle of large torque CVT, analyzes the present development situation and development trend at home and abroad, deepens on the basis of the original research results, according to the design requirements and aims at the characteristics of large torque stepless transmission. A new hydraulic system is designed to meet the requirements of large torque transmission. The mathematical model is established by transfer function method, and the simulation analysis is carried out. The gear pump, pipeline and proportional control hydraulic valve are designed to work under the condition of high oil temperature. The sealing of hydraulic system is studied in detail, and the control strategy of speed ratio and pressure is established. High torque CVT technology is of great significance and broad application prospect in improving the performance of large displacement vehicles, especially the driving performance and maneuverability of military vehicles, and improving the product competitiveness of automobile enterprises.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.46;TH137
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相关期刊论文 前3条
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，本文编号：2178851
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