湿式多片离合器热场分析及温度预估模型研究

发布时间：2019-04-22 12:06

【摘要】：对于当前中国正迅速发展的变速器自动化研究来说,对湿式多片离合器的研究是一个十分核心的关键技术。在湿式多片离合器基础之上开发的变速器系统,它的使用性能和寿命都受到湿式多片离合器工作特性的影响。尤其是其工作时候的温度更是影响它的工作性能的一个极其关键的要素。一方面,由于湿式多片离合器的温度升高会使它的摩擦系数、压紧力、摩擦副工作表面的面积大小以及磨损量等发生比较大的变化,这些变化了的性能参数又会影响到汽车的正常起步、换挡及使用性等许多性能;除此以外,倘若湿式多片离合器在整个工作期间的温度大于了它自身的热容量设计极限值,将会导致湿式多片离合器的摩擦片及对偶钢片发生局部或整体变形,进而引起湿式多片离合器失效,直接影响的车辆行驶的可靠性和安全性。建立湿式多片离合器摩擦副温度模型,研究它的工作温度,并在此基础上,修正控制离合器的一系列性能参数,并为离合器的控制策略提供决策参考,对改善变速器的使用性能和提高它的使用寿命、可靠性等具有十分重要的意义。本文通过建立湿式多片离合器的动力学模型、温度模型,计算了带有行星排的EVT混合动力车用湿式多片离合器在两种不同起步工况下的滑磨功,仿真了在一定的工况下湿式多片离合器摩擦副温度的变化情况;通过分析摩擦副的温度变化峰值可以对离合器的控制模块设定一个温度阈值的措施来达到对湿式多片离合器的热量过载时的保护。为了尽可能的减小湿式多片离合器温度信息检测滞后的影响,通过使用灰色系统理论的方法,分析计算了湿式多片离合器摩擦副的温度的展变化趋势,为进一步研究改进湿式多片离合器的控制策略打下了一定的基础。本文关于湿式多片离合器工作温度特性的研究,对解决变速器中因为离合器温度升高带来的离合器性能改变、使用寿命缩短以及车辆行驶安全性等一系列的问题有一定的理论和实际意义。
[Abstract]:For the rapid development of transmission automation research in China, the research on wet multi-disc clutch is a very key technology. The performance and service life of the transmission system developed on the basis of wet multi-disc clutch are affected by the working characteristics of wet multi-disc clutch. In particular, its working temperature is a very important factor that affects its performance. On the one hand, the friction coefficient, the pressing force, the area of the working surface and the wear amount of the wet multi-disc clutch will change greatly due to the increase of the temperature of the wet multi-disc clutch. These changes in performance parameters will also affect the normal start of the car, gear shift and use of many other performance; In addition, if the temperature of the wet multi-disc clutch during the entire working period is greater than its own thermal capacity design limit, it will result in local or integral deformation of the friction plate and the dual steel plate of the wet multi-disc clutch. The failure of the wet multi-disc clutch directly affects the reliability and safety of the vehicle. The temperature model of wet multi-disc clutch friction pair is established, and its working temperature is studied. On this basis, a series of performance parameters of the control clutch are corrected, and the decision-making reference is provided for the control strategy of the clutch. It is of great significance to improve the performance of transmission and to improve its service life and reliability. In this paper, the dynamic model and temperature model of wet multi-disc clutch are established, and the sliding work of wet multi-disc clutch with planetary row in EVT hybrid vehicle under two different starting conditions is calculated. The temperature change of wet multi-disc clutch friction pair under certain working conditions is simulated. By analyzing the peak value of temperature variation of friction pairs, a temperature threshold can be set for the clutch control module to protect the wet multi-disc clutch from heat overload. In order to reduce the influence of temperature information detection lag of wet multi-disc clutch as far as possible, the development trend of temperature of wet multi-disc clutch friction pair is analyzed and calculated by using the method of grey system theory. It lays a foundation for further study on the control strategy of wet multi-disc clutch. In this paper, the working temperature characteristics of wet multi-disc clutch are studied to solve the change of clutch performance caused by the increase of clutch temperature in transmission. A series of problems, such as shortened service life and vehicle driving safety, have certain theoretical and practical significance.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.4

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