Search Results

Heavy-Duty (HD) diesel engines fulfill the current NOx limits by a sophisticated combination of in-cylinder technologies and an aftertreatment system. In the face of current testing cycles with low average load and efficiency/CO₂ demands measures for the provision of an adequate exhaust temperature become a development core. An alternative to common exhaust management strategies could be variable valve actuation (VVA). Hence a self-developed camless valve actuation system was implemented on a single-cylinder research engine to investigate potential strategies. As these investigations require an appropriate test bench setup the paper consists of two parts. The first part describes the design process of the test bench and focuses on the Rapid Prototyping Systems (RPS) that enabled its operation. The second part discusses the results of different VVA-based exhaust management strategies and gives an outlook to further investigations.

This paper describes the development process and the implementation of an electro-hydraulic variable valve actuation system to a HD single cylinder research Diesel engine. Because of the requirements of this special application the described development process deviates strongly from past publications. These requirements are directly derived from results of the combustion process development on a HD engine and their fulfillment by the VVA is simulated both for the mechanical design and the gas exchange. On the one hand the software AMESim is used on the other hand Ricardo Wave. Finally some experimental results of the prototype system are shown.