Air induction systems are for an internal combustion engine. The air induction systems comprise an air intake plenum that conducts intake airflow to an air cleaner for cleaning prior to combustion in the internal combustion engine. The air intake plenum is movable with respect to the air cleaner between an open position separated from the air cleaner and a closed position connected to the air cleaner. A bellows connects the air intake plenum to the air cleaner when the air intake plenum is in the closed position. The bellows has an upstream first end that seals with the air intake plenum and a downstream second end that seals with the air cleaner.

A structure of an intake manifold (1) for an engine is constituted of divided pieces (10, 20, 30). The structure of the intake manifold includes a gas supply hole (53) formed in a predetermined position of an outer surface of the intake manifold, and configured to supply predetermined gas from the outside, and a gas inlet passage (51) formed in predetermined joint surfaces (10m, 20m) of the divided pieces (10, 20), and configured to guide the gas supplied through the gas supply hole to a predetermined gas inlet position (11) of an intake passage (E1).

An engine system having donor cylinders and non-donor cylinders is disclosed. The engine system may have a first intake manifold configured to distribute air into the non-donor cylinders, and a second intake manifold configured to distribute air into the donor cylinders. The engine system may also have a first exhaust manifold configured to discharge exhaust from the non-donor cylinders to the atmosphere, and a second exhaust manifold separate from the first exhaust manifold and configured to recirculate exhaust from the donor cylinders to the first intake manifold. The engine system may further have an orifice disposed in between the first intake manifold and the second intake manifold. The orifice may be configured to regulate a flow rate of fluid flowing from the first intake manifold to the second intake manifold. The engine system may further have a controller configured to selectively control the orifice in response to a desired exhaust gas recirculation operating condition.

Embodiments for operating an engine having parallel turbochargers and two fluidically coupleable, separated intake manifolds is provided. In one example, a method includes responsive to a first condition, operating a first cylinder group of an engine, deactivating a second cylinder group of the engine, and blocking fluidic communication between a first intake manifold coupled to the first cylinder group and a second intake manifold coupled to the second cylinder group, and responsive to a second condition, activating the second cylinder group and establishing fluidic communication between the first and second intake manifolds.

An engine component includes an intake manifold of stratified layers defining a plurality of runners each having a gas outlet leading to a cylinder head, and a plenum including partial walls forming channels radiating from a common gas inlet extending into a gooseneck conduit having an incorporated positive crankcase ventilation (PCV) apparatus. The gooseneck conduit transitions into the channels and runners such that there is no seal between the gooseneck, plenum, and runners.

An engine component includes an intake manifold of stratified layers defining a plurality of runners each having a gas outlet leading to a cylinder head, and a plenum including partial walls forming channels radiating from a common gas inlet extending into a gooseneck conduit having an incorporated positive crankcase ventilation (PCV) apparatus. The gooseneck conduit transitions into the channels and runners such that there is no seal between the gooseneck, plenum, and runners.

An engine component includes an intake manifold of stratified layers defining a plurality of runners each having a gas outlet leading to a cylinder head, and a plenum including partial walls forming channels radiating from a common gas inlet extending into a gooseneck conduit having an incorporated throttle body. The gooseneck conduit transitions into the channels and runners such that there is no seal between the gooseneck, plenum, and runners.

Air induction systems are for an internal combustion engine. The air induction systems comprise an air intake plenum that conducts intake airflow to an air cleaner for cleaning prior to combustion in the internal combustion engine. The air intake plenum is movable with respect to the air cleaner between an open position separated from the air cleaner and a closed position connected to the air cleaner. A bellows connects the air intake plenum to the air cleaner when the air intake plenum is in the closed position. The bellows has an upstream first end that seals with the air intake plenum and a downstream second end that seals with the air cleaner. A spring is disposed in the bellows. The spring applies a biasing pressure on the bellows that encourages sealing between the bellows and at least one of the air intake plenum and the air cleaner when the air intake plenum is in the closed position. A shield is provided that blocks inflow of rain water to the bellows when the air intake plenum is in the open position.

Embodiments for operating an engine having parallel turbochargers and two fluidically coupleable, separated intake manifolds is provided. In one example, a method includes responsive to a first condition, operating a first cylinder group of an engine, deactivating a second cylinder group of the engine, and blocking fluidic communication between a first intake manifold coupled to the first cylinder group and a second intake manifold coupled to the second cylinder group, and responsive to a second condition, activating the second cylinder group and establishing fluidic communication between the first and second intake manifolds.

An air supply device for an internal combustion engine may include at least one air chamber and at least two intake pipes, which are connected to the at least one air chamber. The intake pipes may each be designed to supply air to respective cylinders of the internal combustion engine, and they each may have intake pipe end portion assigned to a corresponding inlet opening. Via the inlet openings, air can move from an air chamber interior of the at least one air chamber into respective intake pipe interiors of the at least two intake pipes and also via the intake pipe interiors to the cylinders. The intake pipe end portions may end in the air chamber interior and overlap in at least one direction, which is oriented perpendicularly to at least one center axis of at least one of the intake pipe end portions at a common overlapping region.