The Eco Tuk engine uses a so called second generation direct injection process for gasoline engines. The concept of Direct Injection of Liquified Petroleum Gas (LPG-LDI), according the second generation injection process is developed by Mr Peter Mesman with the assistance of many students. The research has been executed in the Laboratory for Internal Combustion Engines at the HAN University of Applied Sciences.
The main objective of the research program was to develop a functioning injection system for an internal combustion engine, what has to be used with a stratified combustion process and a mean lambda value for the exhaust gas outside the lean ignition limit for LPG.
This goal has been reached by direct injection of liquid LPG at the end of the compression stroke just before the spark ignites.
The single cylinder research engine has been running with a lambda value of about 4, which means that a stratified combustion process was obtained. It also means that a lot of possibilities are present to unthrottle the engine when using LPG-LDI. Therefore a significant reduction in specific fuel consumption can be achieved in comparison with engines with port fuel injection of gaseous or liquid LPG.
This research project is finished with a PhD ceremony for Mr. Mesman on March 19th 2010, at the University of Karlsruhe (TH). The promotor is Professor Spicher of IFKM.