LABCAR-MODEL-ICE: Simulation model of internal combustion engines
for HiL tests
LABCAR-MODEL-ICE (internal combustion engine) encompasses diesel, gasoline, and CNG engines. Embracing the fuel system, air system, combustion system, and exhaust gas treatment, it covers the full spectrum of current engine technology.
As LABCAR-MODEL-ICE is implemented in Simulink®, it offers free access to all parameters and the exchange of model components. Basic functional components are integrated via Simulink S-functions. They are delivered in compiled form.
LABCAR-MODEL-ICE is divided into various subsystems, which exist in several variants. In conjunction with the LABCAR-MODEL-VVTB simulation environment (simulation model of a virtual vehicle test bench for HiL tests), the Drivetrain, Driver, Environment, and Driving Dynamics systems are also available.
Now we will describe the engine-relevant subsystems in more depth:
- Fuel system: The model covers both systems with intake manifold injection and with direct injection. The corresponding components – pumps, tank, rail, and injection valves – are represented by a combination of map-based and physical models.
- Combustion system (cylinders): The torque, the heat development, and the gas composition are calculated using a mean value approach. All injection and ignition signals are recorded and processed sequentially for each cylinder in the subsequent engine turn. Modification of the cylinder charge calculation through variable valve timing and camshaft timing control is available. Knock probability and amplitude are also calculated as required. The cooling system is divided into water and oil cooling and connected bi-directionally to the cylinder model through heat flow.
- Air and exhaust gas system: Components such as tubes, throttles, EGR valves, multi-stage turbochargers, and all widely used catalytic converters are physically represented with regard to gas and temperature dynamics, while maps permit the isolated parameterization of specific behavior.