The ASM engine models are ideal for developing and testing engine and exhaust gas aftertreatment ECUs. They simulate a combustion engine, including all the necessary components, as a controlled system for the ECUs. There are models for diesel and gasoline engines with different injection systems and exhaust gas aftertreatment systems. The real-time simulations can be performed with mean-value models or with models of physical precision.
Support of ModelDesk processing as a successor of ASM Parameterization
To meet new requirements for the exhaust behavior of combustion engines, the relevant development and test environments have to be continuously developed as well. For new engine generations, Weichai therefore uses dSPACE Automotive Simulation Models and dSPACE SYNECT.
One thing is for certain: If you start a large high-performance gas engine with a suitable generator, you are the best-motorized employee on site – at an electric power of up to 4,500 kW. Such powerful machines are used primarily for the stationary generation of energy and heat. Caterpillar Energy Solutions developed an entirely new control to ensure that future energy plants remain effi cient, dynamic, and maintenance-friendly.
No modern vehicle ever reaches the market without first undergoing exhaustive tests. And test vehicles alone are no longer enough to test the complex electronic control units. This job is performed by simulation models, which shift ECU development into the virtual reality of a virtual vehicle. Dr. Hagen Haupt, head of dSPACE's Modeling Group, explains how the dSPACE simulation models are meeting this challenge.
Models for developing engine ECUs.
Using mean value models to simulate combustion engines in real time and with rotation-angle-dependent cylinder-wise calculation of state variables
Mean value models have excellent real-time behavior. They are accurate enough to give plausible signals to conventional engine controls, which makes it possible to check the ECUs’ functions and diagnostic capabilities.
In-cylinder models simulate the state variables of the combustion engine consistently at each time instance and synchronously to the crank angle. On real-time computers, they help calculate the thermodynamic processes in the cylinder and the gas mass flow through the intake and exhaust valves synchronously to the crankshaft rotation.
The quality that simulations reach with in-cylinder models is rather high. In-cylinder models provide crank-angle-synchronous representations of the effects of the combustion and gas exchange process for each cylinder. The models are also required for ECUs that evaluate the cylinder pressure and control each intake and exhaust valve individually in timing and lift.
|Feature||Gasoline Basic||Gasoline||Diesel||InCylinder Gasoline||InCylinder Diesel|
|No. of cylinders||Unlimited||20||20||12||12|
|Common rail system||–||Yes||Yes||Yes||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, DOC 1)||Basic variant||DPF, DOC 1)|
|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|
Overview of mean value models and InCylinder models.
ASM Gasoline Engine Basic is a mean value engine model with torque modulation.ASM Gasoline Engine
ASM Gasoline Engine is a mean value engine model with torque modulation and exhaust gas system.ASM Diesel Engine
ASM Diesel Engine is a mean value engine model with torque modulation and exhaust gas system.ASM Gasoline Engine InCylinder
ASM Gasoline Engine InCylinder is a real-time-capable gasoline engine model with in-cylinder pressure and temperature simulation.ASM Diesel Engine InCylinder
ASM Diesel Engine InCylinder is a real-time-capable diesel engine model with in-cylinder pressure and temperature simulation.