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Make
and Model
Free text defining the
engine model, type, etc.
Rated
Engine Power [kW]
Displacement
[ccm]
Not used in the
current version (in future planned to be used for calculation of
rotational inertia)
Inertia
including Flywheel [kgm
2]
Inertia for rotating parts
including engine flywheel
Idling
Engine Speed [rpm]
Low idle, applied in
simulation for vehicle standstill in neutral gear position.
Rated Engine Speed
[rpm]
Full
Load and Drag Curves
(.vfld)
Multiple Full Load and Drag Curves can be defined and assigned to different gears. Gear "0" must be assigned for idling and
Engine Only Mode.
Use the

and

buttons to add or
remove .vfld files. Doubleclick entries to edit existing configurations.
The .vfld file contains the stationary full load curve as a function of engine speed:
Max. Torque (column
2). Engine
Motoring
Torque is defined in column 3.
Transient effects on
full-load torque built up are considered by a PT1 approach. The related
PT1 time constant
is considered in the model as a function of engine speed and has to be
specified in column 4.
Format
(comma-separated, dot = decimal-mark):
Note: text
lines (header, comments,
etc.) must start
with "c "
The PT1 approach to
calculate the dynamic full load is applied using this formula:

with:
ni
= current engine speed
T(ni) = PT1 time constant at engine
speed ni (col. 4 in .vfld file)
P_fld_stat(ni) = Static full load at engine
speed ni (col. 2 in .vfld file)
P_acti-1 = Engine power in previous time stet
Fuel
Consumption Map
(.vmap)
Fuel Consumption Map
measured in stationary conditions.
The following rules apply:
- The map must cover the full engine range between full load
and motoring curve. Extrapolation
is not possible and will abort the calculation!
- At least four points are required.
Format
(comma-separated, dot = decimal-mark):
Note: text
lines (header, comments,
etc.) must start
with "c "
Fuel Map Interpolation
The interpolation is based on
Delaunay
Triangulation 
and
works as follows:
- Triangulate
the given rpm/torque/fuel points (= x,y,z) to create
a
network of triangles with each point of the map being part of at least
one triangle.
- Find the triangle where the to-be-interpolated
load point (x,y) is inside. If no triangle meets the criterion the
calculation will be aborted.
- Calculate the z-value (= fuel) of the given x,y-point in
the plane of the triangle
Calibration
Test Cycle
Not implemented yet
(planned: import of
transient calibration test cycle and model internal calculation of
correction factor(s) to be applied to stationary fuel consumption map.
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Open Command).
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will be updated.
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