动力换档有级自动变速箱的一种新的控制原理的概论

Outline of A New Control Concept for power Shifting of Fixed Step Ratio Automotive Transmissions

动力换档即自动变速器传统的换档是采用脱开 A档离合器和接合 B档离合器来使 A档换到 B档。本文试用一个第三离合器的设想 ,实质上 ,这种第三离合器可以作为传统的离合器之一 ,只用于其他档位换档。这就意味着可以在原来的变速器内采用一个最新的控制软件 ,试验在传统的控制原理协调平顺性和磨损之间关系已不存在困难。该磨损或不平顺性大约可降低为按照传统挂高档的一半。本文发现在采用一个附加离合器的最大趋向是它属于比挂高档高的高档。这里采用一个普通和简单的模型来进行理想研究 ,而仿真实例则采用一个真实齿轮箱的一个更加详细的模型。

Power shifting transmissions, e.g. automatic transmissions, are traditionally shifted from gear A to B by disengaging a clutch belonging to gear A and engaging a clutch belonging to gear B. This paper tries out the idea of employing a third clutch. In practice, such a third clutch can be one of the clutches which is traditionally used only for other gears. This means that the new concept can be used with only a control software update in an ordinary gearbox. The trade off between comfort and wear, which is experienced in the traditional control concept, becomes less troublesome. The wear, or the discomfort, can be reduced to roughly half of that corresponding to a traditionally controlled upshift. The work finds the largest potential in using an extra clutch which belongs to a gear higher than the high gear in an upshift. The theoretical study is carried out with a general and simple model, but a simulation example is added using a more detailed model of an existing gearbox.