Research on Hydro-Mechanical shift system of Belt-CVT to improve both efficiency and performance
Research on Hydro-Mechanical shift system of Belt-CVT to improve both efficiency and performance
复制标题
提高效率和性能的带式无级变速液压机械换档系统研究
DOI：
10.5739/jfps.36.152
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Hirohisa Tanaka
中科院分区：
文献类型：
--
作者：
T. Wakahara;T. Izumi;Toshiji Iida;Hirohisa Tanaka
新一代带式无级变速器，最高可达3.5升级发动机上市。这种无级变速器有助于提高效率和性能。本文介绍了一种新开发的无级变速器皮带轮速比控制的“控制方法”。在以前的控制系统中，滑轮比仅由步进电机控制。为了达到目标比率，与主压力相比，额外的管道压力是必不可少的。当管路压力不足以满足一次压力时，皮带轮传动比就不能精确控制，而且会降低。另一方面，该控制充分利用了液压机械换挡系统的特性，不仅可以由步进电机控制，还可以由线性电磁阀控制带动比。此时，通过确定步进电机指令与皮带轮比之间的关系，寻找最合适的线路压力。因此，管线压力也可以比主压力小一点，而不会造成令人不快的皮带轮比狩猎。
A new-generation belt type Continuously Variable Transmission ranging up to 3.5 liter class engine is on the market. This CVT contributes to improvement in both efficiency and performance. This article describes a ‘control method’ newly developed for this CVT pulley ratio control. In the former control system, pulley ratio was controlled only by step-motor. Extra margin of line pressure was indispensable compared to primary pressure to accomplish target-ratio. If line pressure was not sufficient for primary pressure, pulley ratio couldn't be controlled accurately, and would be lower. On the other hand, in this new control, characteristics of hydro-mechanical shift system are utilized positively, and pulley ratio can be controlled by not only step-motor but also linear solenoid for line pressure. At this time, the most suitable line pressure is searched for by confirming the relation between command of step-motor and pulley ratio. In the result, line pressure can also be reduced a little less than primary pressure without causing unpleasant pulley ratio hunting.