Abstract
A simulation of a diesel engine under cylinder deactivation at part load was conducted in GT-SUITE. The prototype engine is a 16-cylinder diesel engine for locomotive and marine purpose. Cylinder deactivation was implemented by operating valve train system of inactive cylinders in the following different strategies: all valves operate normally; intake valves are closed, exhaust valves operate normally; intake valves operate normally, exhaust valves are closed; all valves are closed. The fuel efficiency was evaluated in terms of relative brake specific fuel consumption. To identify the factors affecting fuel efficiency, an analysis of fuel energy distribution including friction losses, pumping losses, heat transfer to cylinder walls and exhaust gas energy was carried out. The histograms of fuel energy distribution for different strategies of cylinder deactivation were shown. The effect of fuel saving was obtained by closing intake and exhaust valves in the inactive cylinders; other options of cylinder deactivation lead to a decrease in fuel economy.
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