Engines Library

I4 Mean Value Engine Model  I4 Crank Angle Engine Model
I4 Crank Angle Engine Model with VCT
Animation of V8 Engine Model
V6 Mean Value Engine Model with Turbo

Common templates for mean value and crank angle modelsEasy to customise to investigate new technologies like VCT and Atkinson cycle enginesAdd turbochargers, superchargers and related components such as intercoolers


The Engine library is capable of modelling both Spark Ignition and Compression Ignition engines and is split into two variants with different levels of fidelity. Both versions of the Engines library have been designed to work with common engine architecture templates. This enables quick model set-up and ensures a consistent layout for a variety of engine architectures.

The Mean Value version of the Engines library predicts the cycle averaged intake and exhaust flows, emissions and torque. The Crank Angle Resolved version predicts the complete cyclic intake and exhaust flows and torque.

Key Features
Mean Value Version
Crank Angle Resolved Version
    • Control system development using detailed physical models of internal combustion engines.
    • Supports spark ignition and compression ignition engines as mean-value or crank-angle resolved models.
    • Includes turbocharger and supercharger models for forced induction engines.
    • Captures the full transient response of the engine (air-flow, mechanics and thermal effects).
    • In-vehicle NVH and performance analysis when coupled to the Powertrain and Vehicle Dynamics libraries.
    • Reduction of dyno test time.
    • Repeatable virtual test conditions.
    • Real-time capability.
    • Animation is built-in to the models
    Animation of I4 engine model
  • The Mean Value version predicts the cycle averaged air flow and torque produced by the engine.

    The cylinder mass flow rates are calculated through an equation based approach allowing the engine capacity to be scaled within reasonable limits. This enables downsizing studies to be carried out using the library.

    The combustion and emissions modelling is map based using manifold pressure and engine speed as the primary inputs to the maps with further corrections for spark timing and afr.

    This version of the Engine library is particularly suited to driveability analysis where the effect of throttle transients on the driveline behaviour are investigated. In addition, this version of the library is also suited to catalyst light-off investigations.

    Whole vehicle with detailed engine, powertrain and chassis models
  • The Crank Angle Resolved version predicts the cyclic variations for air flow and torque. This is an extension to the Mean Value version of the library.

    The combustion heat release is modelled though a Wiebe model with table based coefficients. The table defines the Wiebe model coefficients at different engine speeds, loads and air-fuel ratios. Both Compression and Spark ignition heat release models are available. Port fuel and direct injection are also supported.

    The flow though the engine block is dictated by the valve geometry and opening characteristics and the piston-cylinder assembly model. Valve and spark timing effects on the fluid dynamics and combustion model mean that the engine performance can be investigated using this version of the library.

    This version of the Engine library is particularly suited to driveline nvh analysis, mount excitations, cranking and detailed friction modelling.

    In-cylinder pressure and temperature trace
  • Downloads

    Technical Papers

    Learn more

Discover Dymola