Lean combustion, EGR or gHCCI at high-load: challenging tasks in the 0D / 1D engine simulation
Nowadays 0D/1D simulations are being widely used in the engine development process. Thanks to the high prediction quality of the models and the low computational times, this is a powerful tool used to reduce development costs by partially eliminating the need for cost-intensive test bench investigations. The trend of vehicle hybridization means that fuel consumption and emissions have to be reduced significantly over the entire engine map and especially in the area of 40 to 80% load, as the electric drivetrain is active in the low-load range. Hence, new concepts are needed to guarantee the efficient engine operation in a very wide range of engine operating conditions. In this context, technologies such as lean engine operation, high load EGR and gHCCI emerge as new, challenging tasks in the 0D/1D simulation.
In order to achieve high model prediction accuracy, 0D/1D models used for the simulation of future SI engine concepts have to not only consider thermodynamic effects, but also account for the in-cylinder chemical processes in detail. Kinetic reaction mechanisms for different fuel types that have been intensively developed in the recent years can be used to perform simulations at in-cylinder conditions that provide better understanding of the chemical processes during the combustion. More importantly, they enable the development and validation of simplified approaches for the 0D/1D simulation that reproduce the real chemistry behavior very accurately.
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