The Engine Dynamics Library is used for combustion engine systems modeling, simulation and analysis, including engine to intake/exhaust flow paths, intercoolers, turbochargers, and EGR-loops. Pressure and thermal dynamics of the complete air and exhaust gas exchange are explicitly modeled. Several turbocharger and EGR configurations can be modeled, including variable geometry turbine designs. The library is well suited for creating models used in transient engine response and related engine control.

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ENGINE
DYNAMICS
LIBRARY
Overview

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 About Engine dynamics library
 Key Features
 Key Capabilities
 Key Applications
 Library Contents
 Modelon Compatibility
 Latest Release: 2018.2
AGENDA
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• Modelica library for simulation of combustion engine systems, including air path
management and gas exchange with focus on the gas dynamics.
• Transient dynamics and steady state performance of engine systems
• Mean-value combustion models for both SI and CI engines
• Fast simulation performance
• Capture trends of emission generation
ABOUT ENGINE DYNAMICS LIBRARY
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• Physical gas exchange modeling
• Mean value combustion model
• Flexible model options for torque,
heat generation, emissions
• Capture dynamics and steady state performance of engine systems
• Wide range of engine and fluid component models
• Engine system templates and examples for rapid model realization
• Compatible with other Modelica libraries for full vehicle thermal management, drivability, fuel economy, etc.
• SIL simulation with engine control system
KEY BENEFITS
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• Diesel and spark-ignited engines
• Capture essential system behavior such as non-
minimum phase and sign reversal effects
• Transient exhaust condition modeling and emissions
• Virtual prototyping on system level
• Drivability analysis
• SiL simulation with engine control system
• HiL simulation
• Capture trends of Nox and soot
KEY CAPABILITIES
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KEY APPLICATIONS
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• Model of an engine in a test cell with fixed speed & ramped fuel
injection.
• Spark ignited engine
• Boost pressure
• Vehicle Thermal Management (VTM)
KEY APPLICATIONS
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EXAMPLE: FUEL RAMP
TURBO CHARGED
ENGINE
This is an example simulation model
illustrating how engine test cell simulations
can be performed. The engine is assumed to
be mounted to an electrical dynamometer that
directly controls the engine speed.
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EXAMPLE: SPARK
IGNITED ENGINE
Test model for the entire engine system with
dynamic measured signal as input. To create
an experiment, extend from this model and
redeclare the engine with a configured one.
Then chose parameters and initial values in
the drop-down menus in the engine parameter
dialog. These are best created by using the
supplied MATLAB functions.
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Boost pressure step response to EGR valve actuation
Objective
CASE STUDY
Results
The EGR valve model is validated with part load map data.
Upstream and downstream pressures are prescribed and the
simulated EGR flow rate is compared to measurements
EGR valve has some essential system properties such as
nonminimum phase behavior in the intake manifold pressure
and a non-minimum phase behavior and a sign reversal in the
compressor flow. It captures the non-minimum phase
behavior between the EGR valve position, change
and inlet manifold pressure.
EGR flow model validation. EGR flow [kg/s], simulated (solid) and
measured (dashed)

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Vehicle Thermal Management (VTM)
Objective
CASE STUDY
Results
Balancing system level requirements for cooling and
energy usage
• Multi-domain physical modeling approach for energy
conservation across domains (mechanical, thermal,
electrical, thermofluid) and vehicle thermal
management
• Flexibility in integration of physical and controls
models
• Thermal
• Mechanical
• Electrical
• Coolant
• Air
• Controls
Controlled temperature
Actuator - thermostat

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LIBRARY CONTENTS
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• Engines
• Cylinder component
• Turbo components
• Heat exchangers
• Volumes
• Pipes
• Valves
• Media models
• Sources
• Sensors
• FlowModifiers
LIBRARY CONTENTS
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Cylinder
• CI (Compression ignition)
• SimpleCICylinder
• MapBAsedCylinder
• SI (Spark ignited)
• SimpleSICylinder
• Templates
• CylinderBase (This template defines
a minimal interface of connectors
and parameters as well as basic
physical equations for a MVM)
LIBRARY CONTENTS
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Cylinder Correlations
• The properties that must be assigned are:
• Volumetric efficiency
• Energy conversion efficiency, η = Indicated MEP / Fuel MEP
• Mechanical friction torque
• Exhaust gas temperature
• Emission concentrations, as defined by medium model
• Torque during engine brake
• Exhaust gas temperature during engine brake
LIBRARY CONTENTS
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Turbo
• Compressor
• Compressor & Compressor_velocity
• Turbine
• Turbine & Turbine_velocity
• VGTTurbine & VGTTurbine_Velocity
• All are parameterized by maps of:
• Corrected mass flow
• Isentropic efficiency
• Corrected speed
• Pressure ratio
LIBRARY CONTENTS
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Note: Turbo components are flow models – use them between volume models or
pressure sources for good numerics.

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HeatExchangers
• ExhaustLiquid
• TableBasedEfficiency
• EpsNTU
• AirLiquid
• TableBasedEfficiency
• EpsNTU
• AirAir
• TableBasedEfficiency
• EpsNTU
LIBRARY CONTENTS
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Note: The heat exchangers are flow models – use them between volume models or pressure sources for
good numeric. The friction model is replaceable.

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Volumes
Several volume components are available
• Storage of mass and energy, assumes ideal mixture
• Introduce state variables for
• Pressure, Temperature, and Mass fractions and trace from
medium model
• Via parameters it is possible to include
• Wall heat capacity & Heat trasfer between gas and wall
• Difference between components
• Port configuration, Default medium choice &
• Connector color
LIBRARY CONTENTS
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Pipes
• Pipe components for air, exhaust gas and coolant are
available.
• The pipe component can model any component where
friction and heat transfer are the dominant effects,
including coolers.
• Friction and heat transfer correlations are selectable using
the parameter dialog
• Use pipe models between volumes or pressure sources
for good numerics
LIBRARY CONTENTS
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Media Models
• Air
• 4-component mixture (H2O, O2, N2, Ar) – Full NASA
• 4-component mixture (H2O, O2, N2, Ar) – Linear Cp
• 1-component (Dry air) – Linear Cp
• Exhaust gas
• 5-component mixture (CO2, H2O, O2, N2, Ar) – Full NASA, with trace
components (NOx, Soot, Hydrocarbons, CO)
• 5-component mixture (CO2, H2O, O2, N2, Ar) – Linear Cp, with trace components
(NOx, Soot, Hydrocarbons, CO)
• 5-component mixture (CO2, H2O, O2, N2, Ar) – Linear Cp
• 2-component mixture (Air, Burned gas) – Linear Cp
LIBRARY CONTENTS
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Basic Components
• FlowModifiers
• Sources
• Sensors
LIBRARY CONTENTS
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MODELON COMPATIBILITY
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• Engine Dynamics Library components are seamless compatible with HeatExchanger Library, VaporCycle
Library, Liquid Cooling Library and Vehicle Dynamics Library.
• Engine Dynamics Library compatible with Modelon product FMI Toolbox
RECOMMENDED MODELON LIBRARY
COMPATIBILITY
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EXAMPLE :
DRIVABILITY
Problem: Engine and drive line control
balancing energy consumption and
drivability.
Solution: Model-based system
design/optimization and control design
Tools: Dymola + Engine Dynamics Library
+ Vehicle Dynamics Library
Partner: OEM
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EXAMPLE : A
WORKFLOW
EXAMPLEUsing the Functional Mock-up Interface, state-
of-the-art physical models becomes
accessible in each state-of-art tool.
Workflow of analyze a Modelica model in
MATLAB using Modelon’s Functional Mock-up
Interface for MATLAB
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LATEST RELEASE: 2019.2

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RELEASE:2019.2
New Features
• Engine Dynamic library 2.4 is based on Modelon Base Library 3.4 and compliant
with Modelica Standard Library 3.2.2 and 3.2.3
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