An arrangement for removing blow-by gases from a crankcase of an internal combustion engine, the blow-by gases being able to be supplied to an air intake system via a tube device, the tube device being connected or connectable to a component assigned to the air intake system and to a component which is in fluid connection to the crankcase. The tube device including a blow-by conduit. The risk of a leaking or incorrectly mounted tube device is avoided in that the tube device has a diagnostic conduit, a spurious air flow being detectable via the diagnostic conduit when the tube device is not tightly connected or is not connected.

An engine including: an exhaust manifold (7) provided near one side surface of an engine; a turbocharger (60) having an exhaust-side inlet connected to the exhaust manifold; and a rocker-arm-chamber-integrated intake manifold (8) disposed on a cylinder head (5) and integrally including a rocker arm chamber (90) and an intake manifold (6). The intake manifold has a wall (101) dividing the rocker arm chamber provided near one side surface of the engine and the intake manifold provided near another side surface thereof to isolate the rocker arm chamber and the intake manifold from each other. The rocker arm chamber has, in its upper portion, a positive crankcase ventilation device protruding therefrom and returning blowby gas to an intake system. The positive crankcase ventilation device has a blowby-gas discharge port (67) connected with a gas conduit (68) through which blowby gas is delivered to an intake-side inlet of the turbocharger.

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.

A motorcycle supercharger (42) pressurizes intake air (I) for a combustion engine (E). The supercharger (42) includes a centrifugal impeller (50) and an impeller casing (52) which covers the impeller (50). The impeller casing (52) includes an outer peripheral wall (84) located radially outward of the impeller (50) and a side wall (86) located axially outward of the impeller (50). Reinforcing first and second side wall ribs (94, 96) are provided at the side wall (86) of the impeller casing (52).

An oil dilution rate calculation system of an internal combustion engine acquires a blowby gas flow ratio showing the ratio of the flow of blowby gas to the flow of gas to the combustion chamber and an output current of the air-fuel ratio sensor during fuel cut control in which the internal combustion engine stops the feed of fuel to the combustion chamber and at a plurality of points of time of different flows of blowby gas passing through the blowby gas passage and flowing to the downstream side of the throttle valve in the intake passage, and calculate an oil dilution rate based on the acquired blowby gas flow ratio and output current.

A gas-liquid separator comprises a housing comprising a first inlet structured to receive a blowby gas stream, the blowby gas stream having a first flow velocity, and a second inlet structured to a communicate a compressed gas into the housing, at least a portion of the second inlet disposed within the first inlet. An elastomeric nozzle is coupled to the first inlet and positioned around the second inlet, the elastomeric nozzle structured to combine the blowby gas stream with the compressed gas such that the compressed gas causes the blowby gas stream to flow at a second flow velocity that is greater than the first flow velocity. An impaction plate is disposed downstream of the elastomeric nozzle such that the blowby gas stream impacts the impaction plate and separates liquid and aerosol contained in the blowby gas stream.

Provided is a connection state determination device. The connection state determination device for the breather pipe determines the connection state of a breather pipe in an internal combustion engine having a supercharger, and the breather pipe is connected between an engine body including a crank case and an intake passage on the upstream side of a compressor of the supercharger, and communicates the crank case and the intake passage. The connection state determination device includes a pipe internal pressure sensor that detects the pressure inside the breather pipe, a pulsation waveform obtaining part for obtaining pulsation due to the variation of pressure inside the breather pipe as a pulsation waveform based on the detected pressure, and a connection state determination part that determines the connection state of the breather pipe based on the pulsation waveform.

An intake manifold made of resin includes a surge tank, a plurality of branch pipes branching off from the surge tank, an EGR gas distribution part for distributing EGR gas to each of the branch pipes, and an EGR cooler for cooling EGR gas introduced into the EGR gas distribution part. The EGR cooler and the EGR gas distribution part are made of resin and provided adjacently and integrally. The EGR cooler includes a gas passage through which EGR gas flows and a water passage through which engine cooling water flows to cool the gas passage to allow the EGR gas to pass through the EGR cooler and then flow in the EGR gas distribution part.

A cylinder head cover structure of an engine includes a positive crankcase ventilation (PCV) valve releasing blow-by gas from an oil separating chamber to an intake system of the engine. The oil separating chamber is included in an oil separator provided to an interior of a cylinder head cover. In the oil separating chamber, oil mist is separated and removed from the blow-by gas. The PCV valve is located between a portion of a defining wall and an exterior wall of the cylinder head cover, and supported by the defining wall and the exterior wall, the defining wall defining the oil separating chamber and the cam housing, and the exterior wall being spaced apart from the portion of the defining wall. The PCV valve is surrounded by a space communicating with the cam housing.

An intake manifold assembly for a vehicle engine includes an intake manifold housing defining a main chamber having perimeter walls and an open upper end; a charge air cooler (CAC) positioned in the main chamber and having an upper cover plate defining a sealing flange; and an integrated positive crankcase ventilation (PCV) system. The PCV system includes a PCV chamber integrally formed into an upper surface of one of the perimeter walls, the PCV chamber having an open upper end; a PCV port integrally formed with the intake manifold housing and in fluid communication with the PCV chamber; a distribution port defined by a wall of the PCV chamber and in fluid communication with an outlet plenum of the intake manifold. Upon securing the CAC to the intake manifold housing, the CAC sealing flange provides a sealed closure for the intake manifold main chamber and the PCV chamber.