エンジンオイルへの燃現生成物混入メカニズムの解析

概要

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It is widely known that NO_x emissions from an engine play an important role in the formation of varnish and sludge in engine oil. Therefore, the authors measured the concentration of nitric and nitrous acid ions in the lubricating oil and analyzed the process through which NO_x mixes into the lubricating oil. It was found that NO_x mixes into the lubricating oil through oil film on the cylinder wall and through crankcase gas ; and that the amount of NO_x mixing into the lubricating oil was proportional to the NO_x concentration in the exhaust and crankcase gas. It was also found that a rapid increase in the concentration of nitrous acid ions when the engine temperature drops results in the condensation of water vapour contained in the crankcase gas.
1987-12-25