【作者】 张晓明；

【导师】 张镭；

【作者基本信息】 东北大学 ， 机械制造及其自动化， 2011， 硕士

【摘要】 车用无级自动变速器(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。另外,无级变速器可以保持在换档过程中动力不中断,减少了行驶冲击,因而提高了汽车的动力性能和驾驶舒适性。根据国外几大著名汽车厂商的性能对比试验得出,在同等条件下,装备CVT的汽车除了在传动效率和成本等方面稍稍逊色于或相当于装备有级机械变速器(MT)或液力机械自动变速器(AT)的同类汽车外,在行驶的经济性、动力性、舒适性、排放、寿命、可靠性等方面均有明显的优势。因此,车用CVT具有极好的实用价值和广阔的应用前景,目前它已经成为国内外汽车变速箱研究和推广的重点。本课题的研究对象是机械电子式无级变速器(EMCVT),它是辽宁省科学技术计划工业攻关重点项目,项目名称是“车用无级变速器实验与控制关键技术攻关”。相比于传统的金属带式无级变速器,EMCVT抛弃了耗能较大且可靠性低的液压加压方式,使用结构简单,能耗低或无能耗的电机、齿轮、弹簧加压等系统作为代替,既降低成了本,又提高了可靠性,而且进一步发挥了CVT节能经济的特点。EMCVT的研发虽已取得阶段性成果,但仍有许多问题尚需解决。本文主要针对EMCVT的控制系统进行了研究和实验。首先介绍了EMCVT的机械结构与变速原理,明确了控制任务及所需的输入输出控制信号,然后对其控制系统硬件电路进行设计与制作,并制成了变速器自动控制箱以及伺服驱动控制箱。文章中讨论了EMCVT传动速比与离合器的控制策略,最后对制成的电控系统进行了编程、仿真、台架实验和车载实验,从而验证了系统的控制功能,达到了较好的效果。更多还原

【Abstract】 Automotive automatic continuously variable transmission (CVT) is wider range of speed ratio change, through continuous adjusting transmission ratio, it can make the engine always work along the best fuel economy curve or the best dynamic curve in any condition, to save fuel, simple operation, reducing pollution exhaust. In addition, CVT can keep the power not break off in the shift process, reduce the impact of driving, thereby improve the dynamic performance and the car driving comfort. According to the performance contrast test by a few great foreign famous auto makers concluded that under the same conditions, the car equipmented CVT in addition to transmission efficiency and cost slightly inferior than the mechanical transmission (MT) or the hydraulic machinery automatic transmission (AT) car, it has obvious advantages in economical efficiency, dynamic property, comfort, exhaust, life expectancy and reliability and so on. Therefore, CVT have excellent practical value and broad application prospect, at present it has become the automobile gearbox focal point of research and extension in internal and foreign country.The research object of this topic is mechanical electronic CVT (EMCVT), compared with traditional metal belt CVT, EMCVT abandoned the high energy consumption and low reliability hydraulic pressure mode, use the simple structure, low or no energy consumption motor, gear, spring system instead, which decreased the cost, and improved reliability, and further develop the CVT energy-saving characteristic.Although the research of EMCVT already has made some progress, there are still many problems waitting to be solved. This article mainly aims at study the control system of EMCVT. Firstly introduced the mechanical structure and speed change principle, made clear the input/output control signals, then designed and made the control system hardware circuit, and made the electronic control box and SSR box. The article discussed the EMCVT control strategy of transmission ratio and the clutch, finally made the simulation experiments and on-board experiment, and verifies the system function, and achieved good results.更多还原