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Engine Editor

eng


newNew file
Create a new empty .veng file


openOpen existing file
Open an existing .veng file


save Save current file


SaveAs Save file as...


sendto 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.


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 [kgm2]
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):
Engine Speed Max. Torque
(Static full load)
Motoring Torque PT1 time constant
c [rpm] [Nm] [Nm] [s]
... ... ... ...
... ... ... ...
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):
Engine Speed Torque Fuel Consumption
c [rpm] [Nm] [g/h]
... ... ...
... ... ...
Note: text lines (header, comments, etc.) must start with "c "

Fuel Map Interpolation

The interpolation is based on Delaunay Triangulation  and works as follows:
  1. 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.
  2. 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.
  3. 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 file with GRAPHi or an user-defined tool (see File Open Command).

OKSave and close file
If necessary the file path in the VECTO Editor will be updated.


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