The disclosure relates to a method and a device for checking the functionality of a crankcase ventilation system of an internal combustion engine. The crankcase ventilation system includes two crankcase ventilation lines arranged between a crankcase outlet of a crankcase and an associated introduction point into an air path of the internal combustion engine, via which crankcase ventilation lines gas can be introduced from the crankcase into the air path. The method includes measuring a pressure in the crankcase, supplying the measured pressure values to a control unit, and calculating the gradient of the measured pressure. The method also includes performing a gradient check, checking whether the gradient satisfies a specified criterion, and returning to the measurement of the pressure if the gradient satisfies the specified criterion. The method also includes recording an entry in a fault memory if the gradient does not satisfy the specified criterion.

A positive crankcase ventilation (PCV) system includes: an oil separator separating oil from blow-by gases; a PCV valve allowing the blow-by gases from which the oil has been separated by the oil separator to flow into intake ports of a cylinder head; a PCV passage vertically extending from the PCV valve; a PCV chamber connected to the PCV passage; and a plurality of bypass passages branching off from the PCV chamber to the intake ports, respectively.

The invention describes a filter element for an oil separator of a crankcase ventilation system in which a filter element is configured to separate oil from fluid and that has a covering surface extending parallel to a direction of flow, together with at least one cover element covering surface in at least some regions. An oil separator is taught having the filter element with at least one pressure control valve controlling crankcase pressure and has a valve closing body that operates in conjunction with a valve seat.

A positive crankcase ventilation (PCV) system includes: an oil separator separating oil from blow-by gases; a PCV valve allowing the blow-by gases from which the oil has been separated by the oil separator to flow into intake ports of a cylinder head; a PCV passage vertically extending from the PCV valve; a PCV chamber connected to the PCV passage; and a plurality of bypass passages branching off from the PCV chamber to the intake ports, respectively.

Disclosed is a device for purifying gas from a crankcase of an internal combustion engine, which includes: a transfer wall having a wall portion with a least one narrow accelerated-distribution opening; one gas-flow deflection wall placed behind the transfer wall and defining an impingement and guide surface; an auxiliary opening separate from the narrow opening, made in the transfer wall; and a bypass valve movable to meet a return member and provided to close the auxiliary opening via closure element for moving closer to the surface, the return member extending in the impingement chamber and having a portion that pushes behind the auxiliary opening in the event of overpressure upstream of the transfer wall.

An oil mist filter includes: a filter body having a tubular shape, the filter body causing processing-target gas supplied to a hollow in the filter body pass through an outer peripheral surface to capture oil mist contained in the processing-target gas; and an end plate disposed at one end surface of the filter body the end plate projecting outward beyond an outer peripheral edge of the one end surface of the filter body. A plurality of ventholes are formed at a portion of the end plate projecting beyond the outer peripheral edge of the one end surface of the filter body. The processing-target gas blown out from the outer peripheral surface of the filter body passes through the ventholes.

Disclosed are: a separation element (20) of a liquid separator (10) for the separation of liquid from an aerosol; a separation medium (38); a liquid separator (10); and a method for producing a separation element. The separation element (20) has at least one separation medium (38) for separating at least the liquid, the separation medium being arranged circumferentially about an element axis (22) in at least one medium layer (40). The aerosol is able to flow through the separation element (20) radially relative to the element axis (22). At least one medium layer (40) has, on a radially inward circumferential surface, at least one channel-shaped indentation (42) extending axially to the element axis (22) to realize at least one channel (44) for separated liquid.

The invention describes a filter element for an oil separator of a crankcase ventilation system in which a filter element is configured to separate oil from fluid and that has a covering surface extending parallel to a direction of flow, together with at least one cover element covering surface in at least some regions. An oil separator is taught having the filter element with at least one pressure control valve controlling crankcase pressure and has a valve closing body that operates in conjunction with a valve seat.

An oil mist separation mechanism of an internal combustion engine includes an oil mist separation portion being integrally provided with an internal combustion engine main body at an outer surface thereof, the oil mist separation portion for separating an oil mist included in a blow-by gas sent from the internal combustion engine main body, and an oil returning portion being connected to the oil mist separation portion, the oil returning portion returning an oil separated by the oil mist separation portion to an oil stored at a lower portion of the internal combustion engine main body.

A valve, an oil separator, and a ventilation system are described. These are used particularly in internal combustion engines, for example for separating oil mist or oil droplets from blow-by gases (crankcase gases). In particular a valve which can be used for example as a bypass valve in a ventilation system is described.