Description
The Gearbox File (.vgbx) defines alls gearbox-related input parameters like gear ratios and transmission loss maps.
See
Gear Shift Model for details.
Relatve File Paths
It is recommended to define
relative filepaths. This way the Job File and all input files can be
moved without having to update the paths.
Example: "Gears\Gear1.vtlm" points to the "Gears" subdirectory of the Gearbox File's directoy.
VECTO automatically uses relative paths if the input file (e.g. Shift Polygons
File) is in the same directory as the Gearbox File. (The Gearbox File must be
saved before browsing for input files.)
Main Gearbox Parameters
Make and Model
Free text defining the
gearbox model, type, etc.
Transmission Type
Depending on the
transmission type some options below are not available. The following
types are available:
- Manual
Transmission (MT)
- Automated
Manual Transmission (AMT)
- Automatic
Transmission (AT)
- Custom
Note: The types AT and Custom are not available in
Declaration Mode.
Inertia [kgm
2]
Rotational inertia of the
gearbox (constant for all gears).
Traction Interruption
[s]
Interruption during
gear shift event.
Gears
Use the

and

buttons to add or
remove gears form the vehicle. Doubleclick entries to edit existing gears.
- Gear "A" defines the ratio of the axle transmission /
differential.
- Column "TC" (AT only) defines which gears are using the torque converter (lock-up clutch open).
- Column
"Loss Map or Efficiency" allows to define either a constant efficiency
value or a loss map (.vtlm).
- Column "Shift polygons" defines the Shift Polygons Input File (.vgbs) for each gear. Not required in Declaration Mode. See Gear Shift Model for details.
Gear shift parameters
Allow shift-up inside
polygons
Skip GearsTorque Reserve [%]
This parameter is required
for the "Allow shift-up
inside polygons" and "Skip
Gears" options.
Minimum shift time [s]
Limits
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 Gear
In 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.
Chart Area
The Chart Area displays the
Shift Polygons Input File (.vgbs) for the selected gear.
Torque Converter
The
Torque Converter Model is still in development.
Inertia [kgm
2]
Rotational inertia of the engine-side part of the torque converter. (Gearbox-side inertia is not considered in VECTO.)
Controls
New
file
Create a new empty .vgbx
file
Open
existing file
Open an existing .vgbx
file
Save
current file
Save
file as...
Send
current file to the VECTO
Editor
Note: If the current
file was opened via the
VECTO
Editor the file will be sent automatically when saved.
Open file browser.
Open file (see
File
Open Command).
Save and close fileIf necessary the file path
in the
VECTO Editor
will be updated.
Cancel without saving