Licensers have been recommending the control method that is in proportion to M.E.P. (Mean Effective Pressure) for suitable quantity of feeding cylinder oil on large 2-stroke slow speed marine diesel engine.
But serious abnormal wear troubles on cylinder liner and piston ring, which are caused clearly by physical shortage of cylinder oil, are occurring in succession in spite of feeding the quantity recommended by licensers.
Especially, there are many problems in applying this control method to derating engine.
This situation suggests that the control method in proportion to M.E.P. treat lightly the physical factor (in proprotion to R. P. M.) .
In this paper, authors adovocated Multi, Proprotional Method (Cylinder oil feed quantity is in proportion to B. H. P. and R. P. M. simultarreou sly) for decision of safety and economical quantity fo cylinder oil, and examination the validity of the new method by analysis results of field dada.
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