A Study on Water Content in Lubricating Oil of Hydrogen-fueled Medium Duty Vehicle on Demonstration

Abstract

A demonstration test was conducted using a heavy-duty vehicle equipped with a hydrogen engine to transport cargo from summer to winter. A sampling survey of the lubricating oil revealed that the amount of water in the oil increased during the winter season. The water condensing in oil showed a strong relationship with both exhaust gas temperature and humidity. It was shown that water condenses in the oil when the temperature of the oil was lower than the dew point of blow-by gas. This result described that heating oil is effective for preventing oil from emulsifying in winter.