| 摘要 |
PROBLEM TO BE SOLVED: To provide a reduction device for blow-by gas equipped with a crankcase pressure adjusting valve capable of substantializing reduction in crankcase pressure under conditions of both a high load high speed operating condition and an exhaust brake working condition. SOLUTION: The reduction device for blow-by gas has a negative pressure pipe equipped with the adjusting valve connecting the crankcase of an engine and an intake passage. The negative pipe between the adjusting valve and the intake passage is branched into two branching passages. Each of the passages are connected to the intake passages of the upstream side and downstream side of the engine intake air. A selector valve is attached to branching parts of both the branching passages, and the branching passages are switched according to the engine operating state by the selector valve. COPYRIGHT: (C)2005,JPO&NCIPI
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