Gear Shift Model

The Gear Shift Model is based on shift curves that define the engine speed for up- and down- shifting as a function of engine torque. As soon as the engine operation point passes one of the shift curves a gear change is initiated.
The shift polygons are saved in the Shift Polygons Input File (.vgbs) and have to be added to the Gearbox File. In Declaration Mode the shift polygons are generated automatically based on the full load curve.


Example shift polygons

In the Gearbox File two additional parameters are defined:

 
Gear Skipping


Gear Skipping can be enabled in the Gearbox File. By default it is enabled for AMT and MT.
Whenever a gear change is initiated (by crossing the up- or down-shift line) VECTO may skip one or several gears as long as the required torque reserve is provided.



Early Upshift

Early Upshift can be enabled in the Gearbox File (Allow shift-up inside polygons). By default it is enabled for AMT only.
If the next higher gear provides the required torque reserve and it's rpm is still above down-shift-rpm VECTO will shift up.