Network of Competence (K-Net): Internal Combustion Engines of the Future

Various alternative combustion processes to reduce particulate- and NOx-emissions of diesel engines are being investigated. The aim is to avoid zones within the combustion chamber that are rich in fuel and at the same time have high temperatures. This can be reached by homogenizing cylinder charge and using high rates of exhaust gas re-circulation. The development of alternative combustion processes with consideration of technical, economical and ecological requirements is focused on the following activities: Increase of load range dependent on boost-pressure with 1D simulations to investigate the potential of charging-concepts in respect to oncoming emission legislation together with tests on the EHVA-single-cylinder-research-engine. Reducing the trade-off between combustion noise and unburned mixture residuals of CO and HC as result of high rates of exhaust gas recirculation in homogeneous combustion. Different combustion processes for partial- and full load have to be combined which requires a fast-reacting combustion-based engine control. Investigations of high load operation with increasing exhaust gas recirculation rates for further reduction of NOx emissions. The aim of the network of competence is to develop methods and tools to find concepts for future diesel engines to fulfil economical aspects and the oncoming strict emission limits. The four-years research activities encompass bench tests with the EHVA-single-cylinder-research-engine and a serial production engine as well as simulations with 0D, 1D, and 3D programs. The results of engine tests and simulations will lead to the development of a passenger car that is tested and optimized at the end of the four-year duration of the project. The high operating flexibility of the single-cylinder-research-engine EHVA (latest common rail generation, swirl variability, variable valve train, high exhaust gas recirculation rates with roots blower) is used for further development of conventional and alternative combustion processes. The evaluation after two years was successfully passed in spring and an extension for a further three years period of the K-NET after 2007 is planed and prepared.