| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a blowby gas control device of an engine that can prevent freezing of an intake air flow rate control valve while maintaining an output efficiency of the engine. <P>SOLUTION: A blowby gas control device 1 of an engine E includes an upstream path 22 communicating an upstream of a throttle valve 20 with a crankcase 4, and a downstream path 21 communicating a downstream of the throttle valve 20 with the crankcase 4 via a PCV valve 31. The device includes: an intake air flow rate controlling means 51 that can perform a normal opening control for controlling the throttle valve 20 to an opening corresponding to an acceleration opening, and a low opening control for controlling the throttle valve 20 to a lower opening side than the opening corresponding to the acceleration opening; a moisture amount determining means 52 for determining whether moisture accumulated in an oil pan 4 reaches an accumulation acceptable value; and a return channel switching means for making the intake air flow rate controlling means 51 perform the low opening control, when an integrated value of an accumulated amount of moisture is determined to reach the accumulation acceptable value and the throttle valve opening is in a highly loaded state near fully-opened. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
