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In this paper, to reveal behavior of SO2 gas which is recirculated from the exhaust gas on wear of piston rings and cylinder liner in diesel engines, a numerical model to estimate the amount of SO2 in oil layer on the cylinder wall is developed. The experimental fact that increase of wear of the piston rings and the cylinder liner due to EGR can be explained by the increase of the calculated SO2 concentration in the oil layer.

The “idling stop” of the vehicle, which is defined as no rotation of the engine when it stops, theoretically brings to reduce the fuel consumption (i.e. carbon dioxide) and the exhaust emissions. However, the idling stop practically has weak points as follows: 1. When the engine is restarted, much fuel is consumed. 2. When the engine is restarted, much the exhaust emissions are discharged. 3. While various electric devices work, the load of the battery is high. 4. The deterioration of the lubricating oil proceeds due to repeating start and stop. In order to overcome the above weak points the authors propose the new system called IISS.