PCV SYSTEM FOR INTERNAL COMBUSTION ENGINE

摘要

Provided is a PCV system for an internal combustion engine with which it is possible to suppress the occurrence of pre-ignition caused by the flow of oil into the cylinders. In the pre-ignition occurrence region a passage-switching valve (70) is controlled so as to enable blow-by gas to flow via a bypass passage (72). Thus, the passage pressure loss increases, the PCV flow volume decreases, and the blow-by gas is able to pass through a high-collection-efficiency separator (74). Consequently, it is possible to reduce the amount of oil that is removed, and it is possible to suppress the occurrence of pre-ignition caused by the flow of oil into the cylinders.