Simple Engine
Simplified engine model based on external speed characteristics.
blockType: SubSystem
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Path in the library: |
Description
Block Simple Engine Implements a simplified engine model using an interpolation table of the dependence of maximum torque on engine speed, mass fuel consumption parameters, and engine efficiency to estimate torque and fuel consumption. The block can be used for:
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Engine modeling in vehicle system models and during semi-natural testing (Hardware-in-the-loop, HIL);
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Research on fuel efficiency.
Ports
Input
#
TrqCmd
—
required torque
scalar
Details
Torque, in NM.
| Data types |
|
| Complex numbers support |
No |
#
EngSpd
—
engine speed
scalar
Details
Engine speed, in rpm.
| Data types |
|
| Complex numbers support |
No |
Output
#
Info
—
information signal
the tire
Details
A bus containing the results of the block calculation.
| The signal | Description | Units of measurement | ||
|---|---|---|---|---|
|
Mass air consumption |
kg/s |
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Normalized mass air flow in the engine cylinder |
— |
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The ratio of the amount of air to the amount of fuel (Air-Fuel Ratio, AFR) |
— |
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The output fuel consumption in the engine |
kg/s |
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Volumetric fuel consumption |
m3/s |
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Engine exhaust gas temperature |
K |
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Motor output torque |
N⋅m |
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Engine speed |
rpm |
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The absolute angle of rotation of the engine crankshaft where — the number of revolutions of the crankshaft in one working stroke |
degrees |
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Specific effective fuel consumption during engine testing on a brake bench (Brake-Specific Fuel Consumption, BSFC) |
g/kWh |
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|
Mass consumption of hydrocarbons in exhaust gases |
kg/s |
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Mass consumption of carbon monoxide in exhaust gases |
kg/s |
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Mass consumption of nitrogen oxide and nitrogen dioxide in exhaust gases |
kg/s |
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Mass consumption of carbon dioxide in exhaust gases |
kg/s |
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Mass consumption of solid particles |
kg/s |
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Power on the crankshaft |
Tue |
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Power generated from fuel |
Tue |
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Power loss |
Tue |
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_ Not used_ |
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| Data types |
|
| Complex numbers support |
No |
#
EngTrq
—
engine torque
scalar
Details
Engine torque, in NM.
| Data types |
|
| Complex numbers support |
No |
Parameters
Maximum torque curve
# Engine maximum torque [f_tqmax], Nm — maximum engine torque — external speed characteristic
Details
The maximum engine torque is the external speed characteristic, in nm.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
# Breakpoints for engine speed input [f_tqmax_n_bpt], rpm — engine speed
Details
Engine speed, in rpm.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
Fuel and efficiency
# Fuel lower heating value Lhv, J/kg — lower calorific value of fuel
Details
The lowest calorific value of the fuel, in J/kg.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
# Fuel specific gravity Sg — relative fuel density
Details
Relative fuel density, dimensionless.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
# Average brake specific fuel consumption BsfcAvg, g/kwh — average specific effective fuel consumption when the engine is tested on a brake stand
Details
Average specific effective fuel consumption during engine testing on a brake bench, in g/kWh.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |