WOLFRAM SYSTEM MODELER

# T_demand

Block that calculates the demanded torque of the basic engine based on engine speed and throttle.

# Wolfram Language

In[1]:=
`SystemModel["IndustryExamples.AutomotiveTransportation.Driveline.Components.EnginePackage.Utilities.T_demand"]`
Out[1]:=

# Driveline: T_demand

## Description

This block calculates the demanded torque of the basic engine based on engine speed and throttle. The equations have been derived from [1] and they capture the following features:

• The maximum torque
• The torque decrease at high engine speed
• Idling and idle speed control
• Engine braking at speeds over idling

The default parameters have been set so that the maximum output torque corresponds to a generic engine.

[1] P. Nobrant, "Driveline Modelling using MathModelica," MSc thesis, Vehicular Systems, Linköping Institute of Technology, Sweden, 2001. www.fs.isy.liu.se/Publications/MSc/01_EX_3114_PN.pdf

# Parameters (7)

m_ac_Min Value: 0.0021 Type: Mass (kg) Description: Minimum mass of air in cylinders Value: 0.0759 Type: Mass (kg) Description: Minimum mass of air in cylinders Value: 101.3 * 10 ^ 3 Type: Pressure (Pa) Description: Ambient pressure Value: 1.222 * 10 ^ 4 Type: Pressure (Pa) Description: Minimum intake manifold pressure Value: 77870000.0 Type: Real (1/(m·s²)) Description: Torque demand constant Value: 0.006117 Type: Volume (m³) Description: Torque demand constant Value: 0.0008426 Type: Volume (m³) Description: Torque demand constant

# Connectors (3)

u1 Type: RealInput Description: Connector of Real input signal 1 Type: RealInput Description: Connector of Real input signal 2 Type: RealOutput Description: Connector of Real output signal

# Used in Components (1)

 BasicEngine IndustryExamples.AutomotiveTransportation.Driveline.Components.EnginePackage Engine as implemented in "Driveline Modelling using MathModelica", Per Nobrant.