Description
The Vehicle File (.vveh) defines the main vehicle/chassis parameters like axles including
RRCs, air resistance and weight.
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: "Demo\RT1.vrlm" points to the "Demo" subdirectory of the Vehicle File's directoy.
VECTO automatically uses relative paths if the input file (e.g. Retarder Losses File)
is in the same directory as the Vehicle File. (The Vehicle File must be
saved before browsing for input files.)
General vehicle parameters
Vehicle Category
Axle
Configuration
Gross Vehicle Mass Rating [t]
HDV
Class
Displays the
automatically selected HDV Class depending on the settings above.
Weight/Loading
These fields define the
weight and loading of the vehicle.
Max.
Loading displayes the maximum possible loading for the
selected vehicle depending on curb weight and GVW values.
Note: VECTO uses the sum of Curb
Weight Vehicle,
Curb
Weight Extra Trailer/Body and Loading for calculation!
Air Resistance
The product of Drag Coefficient
[-] and Cross Sectional Area
[m
2] (
cd x A) and
Air
Density [kg/m
3]
(see
Settings) together with the vehicle speed defines the Air Resistance. Note that the Drag Coefficient may
be altered when using
Cross
Wind Correction.
Axles/Wheels
For each axle the parameters
Relative axle load,
RRCISO and
FzISO have to be defined in order to calculate the total
Rolling Resistance Coefficient.
Furthermore the
Wheels Inertia [kgm²] has to be set
per wheel for each axle. In
Declaration Mode the inertia is defined automatically according to the selected tyres.
Use the

and

buttons to add or
remove axles form the vehicle. Doubleclick entries to edit existing
axle configurations.
Dynamic Tyre Radius [mm]
Effective (dynamic) wheel radius used to calculate engine speed. In
Declaration Mode the radius calculated automatically using tyres/rims of the powered axle.
Powered axle tyres/rims
Retarder Losses
If available a
Retarder Torque Loss Map can be defined here to consider idling losses caused by the retarder.
Note: Do not use this function if the retarder's losses are already included in the Transmission Loss Maps!
Three options are available:
- None
- Primary (before gearbox): The rpm ratio is relative to the
engine speed
- Secondary (after gearbox): The rpm ratio is relative to the
cardan shaft speed
Both, primary and secondary retarders, require an
Retarder Loss Torque Input File (.vrlm).
Cross Wind Correction
Four different options
are available:
- No Correction
- Speed dependent (User-defined)
- Speed dependent (Declaration Mode)
- Vair & Beta Input
Depending on the chosen mode either a
Speed Dependent Cross Wind Correction Input File (.vcdv) or a
Vair & Beta Cross Wind Correction Input File (.vcdb) must be defined. For details see
Cross
Wind Correction.
Controls
New
file
Create a new empty .vveh
file
Open
existing file
Open an existing .vveh
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.
Save
and close file
If necessary the file path
in the
VECTO Editor
will be updated.
Cancel without saving