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ASM Gasoline Engine InCylinder

In-cylinder pressure, temperature, and torque calculation

ASM Gasoline Engine InCylinder is a real-time-capable gasoline engine model with in-cylinder pressure and temperature simulation.

ASM Gasoline Engine InCylinder is an open Simulink model for developing and testing electronic control units (ECUs) with engine management based on the in-cylinder pressure. The model simulates in-cylinder pressure in real time by means of a zero-dimensional thermodynamic approach. The gasoline combustion process is reflected by considering ignition delay, combustion duration, and typical burn function trajectories. In the combustion process, gas exchange simulation is related to the lift of the intake and exhaust valves. The gas-dynamic behavior of the air path and exhaust path is implemented as a mean value system with manifold pressure, temperature, and mass calculation. The inlet and exhaust valves are modeled as isentropic orifices. They can handle variable valve timing (VVT), variable valve lift (VVL), and the simulation of engines without a camshaft. To simulate the engine within an automotive system (car or truck), the engine model incorporates a basic longitudinal drivetrain model. Models for the environment and driver complement the virtual powertrain.

Features at a Glance

  • Simulation of in-cylinder pressure and temperature in real time: e.g., in response to injection, ignition event or variable valve timing
  • Gasoline applications with up to 12 cylinders with direct or port injection and turbocharger for real-time simulation. Unlimited number of cylinders for offline simulation.
  • Gas exchange simulation related to the lift of the intake and exhaust valves
  • Fuel injection systems: direct or port injection
  • Exhaust gas recirculation (EGR) of exhaust and fresh air with EGR cooler
  • Start/stop system support
  • Air path topology (e.g., V-engine or inline engine) configurable via parameters

  • Air system
  • Fuel system
  • Valve system
  • Piston engine
  • Turbocharger
  • Drivetrain (simple)
  • Vehicle dynamics (longitudinal)
  • Environment (simple)

Feature Gasoline Basic Gasoline Diesel InCylinder Gasoline InCylinder Diesel
No. of cylinders Unlimited 20 20 12 12
EGR Yes Yes Yes Yes
Map-based turbocharger Yes Yes Yes Yes Yes
Physical turbocharger Yes Yes Yes Yes
Common rail system Yes Yes Yes Yes
Pump nozzle Yes
Fuel injection Intake manifold Direct, intake manifold Direct Direct, intake manifold Direct
Wall film evaporation Yes Yes
Combustion modes Homogeneous Homogeneous, stratified Diffusion Homogeneous Diffusion
Exhaust system Basic variant Basic variant DPF, DOC1) Basic variant DPF, DOC1)
Soft ECU, engine Yes Yes 2) Yes 2) Yes 2) Yes 2)
Combustion simulation Mean value Mean value Mean value Physical Physical
Valve simulation Mean value Mean value Mean value Physical Physical
1) DPF: diesel particulate filter, DOC: diesel oxidation catalyst
2) Torque-based

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