Adaptive electronic pressure-force control for conical-disc looping mechanisms, especially for motor vehicles (CVT)

摘要

The subject of the invention serves for the optimum metering of the pressure force between the conical friction discs and the transmission band (pull cord or push-type link band) in CVTs. Consequently, increased power losses occurring conventionally in the case of excessive pressure are reduced, and also harmful slip, particularly under spontaneous and extreme loads, is avoided, so that the lifetime of the components is also increased. Features are electronic devices and components assigned to CVTs: for acquiring and storing a continuously updated reference relation, ascertained under predetermined operating conditions (preferably idling), between the operative transmission "ü" of the CVT and its geometrical transmission position "s" recorded by means of a path sensor, from which, in dynamic practical use in motor vehicles, for the instantaneous geometrical transmission position precisely the slip component of the friction drive is selected from other ü-mismatches and is used as a regulator for controlling the pressure force; for the preparation and storage of an operation-dependent and load-dependent ü-deviation trend (42) of predetermined size which is composed, as a difference from the reference ü-trend (41) from an ideal (predetermined) slip and other influencing quantities which are in fixed relationships with the CVT operating mode; which, when the set transmission deviations, therefore the predetermined ideal slip, are exceeded, [lacuna] Original abstract incomplete. <IMAGE>