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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 Curve
(.vfld)
Stationary full load curve described as a function of engine speed by Max. Torque (column 2). Engine Motoring Torque is described 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 measued 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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