| 摘要 |
PROBLEM TO BE SOLVED: To inhibit deterioration of oil caused by, for instance, dilution of the oil with alcohol or moisture. SOLUTION: A first section passage 206a and a second connection passage part 240b connected to a cylinder head 230 are respectively closed by a throttle valve 214 and a solenoid valve 250 and no air is newly supplied from the outside of an engine 200 to the cylinder head 230. In addition, no air newly flows in a crankcase 290 and gas staying in the crankcase 290 flows out into the first section passage part 206a so that pressure in the crankcase 290 is reduced and, among the oil 280 stored in the crankcase 290, alcohol and moisture contained in the oil 280, alcohol and moisture of the components having relatively low boiling temperatures than the oil vaporize. COPYRIGHT: (C)2009,JPO&INPIT
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