Make and Model
Free text defining the
gearbox model, type, etc.
Transmission TypeDepending on the transmission type some options below are not available. The following types are available:
- Manual Transmission (MT)
- Activates the "Skip Gears" option. No torque converter.
- Automated Manual Transmission (AMT)
- Activates the "Allow shift-up inside polygons" and "Skip Gears" option. No torque converter.
- Automatic Transmission (AT)
- Torque converter ist set and must be parameterized.
- Custom
- Enables all options for user-defined settings.
Inertia [kgm
2]
Rotational inertia of the
gearbox (constant for all gears).
Traction Interruption
[s]
Interruption during
gear shift event.
Gears
- Doubleclick items to edit
ratio and efficiency of the selected gear.
-
Gear "A" defines the ratio of the axle transmission / differential.
- Gear
"TC" (AT only): For AT gearboxes with torque converter a seperate (fictional) gear
is defined for cases where the lock-up clutch is open. This gear
is used at vehicle start; when the up-shift rpm is reached VECTO
will shift to the next gear (Gear 1) which means the lock-up clutch is
closed. In the modal result files (.vmod) the "TC" gear will be output as "0.5" (to avoid non-numeric characters).
-
Set ratio=0 for unused gears.
Alternatively to setting a constant efficiency value it is possible to
define a Torque Loss Map in the following format:
Torque Loss
Map Format (comma-separated, dot = decimal-mark):
c Input Speed |
Input
Torque |
Torque
Loss |
c [rpm] |
[Nm] |
[Nm] |
... |
... |
... |
... |
... |
... |
Note: text
lines (header, comments,
etc.) must start
with "c "

Remove Gear (i.e. Ratio=0)
Gear shift parameters
Shift polygons file (.vgbs)
This
file contains the up- and down- shift curves that control the gear
shift behaviour. Whenever the actual engine speed crosses the up- or
down-shift line a gear-shift is initiated.
Shift Polygons File Format (comma-separated, dot = decimal-mark):
c Engine Torque |
Downshift rpm |
Upshift rpm |
c [Nm] |
[1/min] |
[1/min] |
... |
... |
... |
... |
... |
... |
Note: text
lines (header, comments,
etc.) must start
with "c "
Allow shift-up inside polygonsIf the next higher gear provides the required
torque reserve and it's rpm is still above down-shift-rpm VECTO will shift up.

Skip GearsWhenever
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.

Torque ReserveThis parameter is required for the "Allow shift-up inside polygons" and "Skip Gears" options.
Minimum time between two gear shiftsLimits
the time between two gear shifts in whole seconds. This rule will be
ignored if rpms are too high or too low. Note that high values may
cause high rpms during acceleration.
Start GearIn order to calculate an appropriate
gear for vehicle start (first gear after vehicle standstill) a
fictional load case is calculated using a specified reference vehicle speed and reference acceleration
together with the actual road gradient, transmission losses and
auxiliary power demand. This way the start gear is independent from the
target speed. VECTO uses the highest possible gear which provides the
defined torque reserve.
Torque ConverterTorque Converter installedThis option is only available if
transmission type is set to
Custom. For AT this option is always On, for MT and AMT always Off.
Torque converter characteristics file (.vtcc)
This file defines the torque converter characteristics as described in VDI 2153:
Speed Ratio (ν) = Output Speed / Input Speed
Torque Ratio (μ) = Output Torque / Input Torque
Input Torque is the input torque (over ν) for a specific reference engine speed (see below).
The torque converter characteristics must also be defined for speed ratios of more than one (
ν>1) in order to calculate overrun conditions (torque<0).
Torque Loss
Map Format (comma-separated, dot = decimal-mark):
c Speed Ratio ν |
Torque Ratio μ |
Input Torque at reference rpm |
c [-] |
[-] |
[Nm] |
... |
... |
... |
... |
... |
... |
Note: text
lines (header, comments,
etc.) must start
with "c " Reference rpm for torque characteristicReference engine speed associated with the Input Torque curve in the .vtcc file.
Open file browser.
Open file with GRAPHi or an user-defined tool (see
File Open Command).