An intake and exhaust system for preventing generation of condensed water may include: an exhaust gas recirculation (EGR) system circulating some of combustion gas from an exhaust pipe to an intake pipe; an active purging system compressing and supplying evaporation gas generated from a fuel tank to the intake pipe; and a controller to control the EGR system and the active purging system. In particular, the controller calculates a saturated water vapor pressure based on temperature at a position between the EGR system and the intake pipe, and calculates a saturated water vapor pressure based on temperature of the intake pipe and then compares one of the two saturated water vapor pressures with a water vapor pressure of intake air so as to reduce an EGR rate of the EGR system or a purging rate of the active purging system based on the comparison result.

An air cleaner may include a filter case configured to introduce, by a suction force of an internal space, ambient air being discharged through a filter provided in the internal space as intake air from which foreign substances are removed; and a built-in valve built in the internal space of the filter case and configured to form an ambient air introduction path for introducing the ambient air and an additional ambient air introduction path separated from the ambient air introduction path and to open the additional ambient air introduction path so that the ambient air flows into through the additional ambient air introduction path when the suction force is increased.

A low emission submersible engine is part of a multipurpose aquatic device, such as an aquatic craft or an electrical generator. A propulsion system having a propeller is coupled to the submersible engine to produce a swimmer propulsion machine and a generator is attached to the engine to produce an electrical generator. The submersible engine receives air from a snorkel that extends up above a water line. The aquatic device has a fuel reservoir which may receive liquid fuel or may receive a fuel cylinder. Floatation chambers keep the aquatic device afloat with the engine submerged. The exhaust assembly and exhaust ports from the engine may also be submerged and the exhaust ports may provide additional thrust. A propulsion system housing integrates the drive shaft and propeller, clutch coupler, exhaust conduits and water flow conduits and is detachably attachable to the engine.

The present invention belongs to the technical sector of fluid filtration systems which can be used for air filtration in an internal combustion engine. The invention refers to a filtering device (1) including a filtering element (24) which presents an open axial end (26) and an axial end (27) closed by a cover (28); and an intake cover (7). The said cover (28) includes at least a first tubular boss (55) projecting towards the intake cover (7); and the intake cover (7) includes at least a second tubular boss (57) complementary to the first tubular boss (55) and projecting towards the cover (28); the first tubular boss (55) is slotted in the second tubular boss (57). The invention also refers to a tubular filtering element (24) and to a maintenance process of a filtering device.

In one example, an air intake system is provided. The air intake system includes a first air inlet duct providing intake air to an engine intake conduit, the first air inlet duct including an opening positioned external to an engine compartment. The air intake system also includes a second air inlet duct positioned upstream of the engine intake conduit and external to the engine compartment, the second air inlet duct including a porous material spanning an opening in the second air inlet duct, the porous material having a plurality of defined openings sized to prevent snow from traveling therethrough and collect on the porous material thereby impeding airflow through the second air inlet duct during snowy and icy conditions.

An inlet assembly for an auxiliary power unit for an aircraft, including a duct configured to provide fluid communication from an environment of the aircraft to an inlet of an engine of the auxiliary power unit, and a filter received in and extending across the duct. The filter includes a first filter portion permeable to air, positioned across only part of the duct and defining a transverse edge in the duct; a second filter portion permeable to air and extending from the transverse edge to an end downstream of the transverse edge, and a collection member impermeable to water. The collection member extends between the downstream end and a duct wall. The first and second filter portions are non-parallel and the second filter portion and the collection member are non-parallel. An auxiliary power unit assembly and a method of feeding air to an internal combustion engine are also discussed.

A system in a vehicle includes a primary intake manifold, a secondary intake manifold, a valve, and a computer. The primary and secondary intake manifolds are configured for an engine compartment of the vehicle. The secondary intake manifold is arrangeable to extend from outside the engine compartment to the valve. The valve is connected to each of the primary and secondary intake manifolds. The computer is in communication with the valve and programmed to identify a flood risk and then actuate the valve.

The internal combustion engine includes a compressor for supercharging intake air, an EGR device for introducing EGR gas into an intake passage at a position on an upstream side relative to the compressor, and a collecting pocket that is provided at an outer circumference of a compressor inlet and that collects condensed water generated inside the intake passage on an upstream side relative to the compressor. The collecting pocket opens towards the upstream side of the compressor, and is formed in a circular ring shape that surrounds the outer circumference of the compressor inlet. The collecting pocket includes a partition wall that holds back a flow of condensed water that attempts to move in a downward gravitational direction inside an internal space of the collecting pocket.

An internal combustion engine includes, in addition to an LPL-EGR system, two water vapor separation film modules for fresh air and for EGR gas. One module 34 is connected to a pressure reducing pump 40 through a suction passage 38. Other module 36 is connected to a pressure reducing pump 44 through a suction passage 42. A condenser 54 that condenses water vapor that flows through the suction passage 38 is provided in the suction passage 38. A water tank 56 that temporarily accumulates condensed water that is discharged from the condenser 54 is provided on a downstream side relative to the condenser 54. The water tank 56 is connected to injectors 60 that inject water from the water tank 56 into intake ports of respective cylinders or into respective cylinders.

A filter element assembly includes a filter body and an auxiliary filter. The filter body includes a sidewall around a hollow core. Further the filter body and auxiliary filter are both received and held on a support including a base and a cage.