An intake duct for an internal combustion engine includes a plurality of segments coupled together into a tubular shape. The segments include at least a first segment and a second segment. The first segment is formed from a material harder than the second segment. The first segment includes a groove that extends in the extending direction in a portion coupled to the second segment and projections that project from one of two inner surfaces of the groove. The second segment is formed from a material that allows for elastic deformation. The second segment includes a rib. The rib extends in the extending direction and has a projection width that is less than the opening width of the groove. The rib is fitted into the groove so that the projections locally compress the rib in the width direction of the groove.

Cross-port air flow that improves engine fuel economy and reduces pumping losses during part-throttle operation can be implemented in various types of internal combustion engine systems using ports that interconnect the intake ports of different cylinders, thus allowing different cylinders to share combustion air. Cross-port air flow is commenced during part-throttle engine operation to disrupt the primary combustion air flow from each throttle to its associated cylinder, which reduces charge density and engine power. The engine compensates for the reduced power by incrementally opening the throttles, thus increasing the primary combustion air flow, reducing pumping losses and improving fuel economy.

A spin tube assembly for an engine air cleaner is provided. The spin tube assembly includes a housing, a spin tube panel, a plurality of spin tubes and at least one constrictor. The plurality of spin tubes are supported on the spin tube panel in parallel relation to one another. Each spin tube of the plurality of spin tubes includes a helical element causing air entering the spin tube to rotate such that particles within the air are moved by centrifugal action outwardly against a wall of the spin tube. At least one spin tube of the plurality of spin tubes has a constrictor upstream from the helical element thereof. The constrictor causes a localized restriction of air entering the at least one spin tube compared to the spin tubes without constrictors. Methods of use and configuration are also provided.

The invention relates to a fluid pipe arrangement (100), in particular for a charged air duct of an internal combustion engine, comprising a housing (10) having a longitudinal extension (L). The housing (10) includes a first fluid duct (20) having a first fluid inlet (22) and a first fluid outlet (24) for a first fluid and at least one second fluid duct (30) having a second fluid inlet (32) and a second fluid outlet (34) for a second fluid. Thermal insulation means (40) are provided between at least a portion (38) of the second fluid duct (30) and at least a portion (28) the first fluid duct (20).

A system, apparatus and associated method for the catalyzation of a fossil fuel prior to combustion within an internal combustion engine. A voltage is inputted from a source to a relay and an ignition circuit in separate communication with the relay. The relay converts the input voltage to a negative output voltage applied to a fuel line in communication with a fuel injector of the engine, resulting in a negative charge imparted to the fuel prior to combustion and in order to increase oxidation/burn efficiency with resultant mileage/horsepower increase and concurrent decrease in pollutants resulting from discharge of partially combusted reactants.

A system, apparatus and associated method for the catalyzation of a fossil fuel prior to combustion within an internal combustion engine. A voltage is inputted from a source to a relay and an ignition circuit in separate communication with the relay. The relay converts the input voltage to a negative output voltage applied to a fuel line in communication with a fuel injector of the engine, resulting in a negative charge imparted to the fuel prior to combustion and in order to increase oxidation/burn efficiency with resultant mileage/horsepower increase and concurrent decrease in pollutants resulting from discharge of partially combusted reactants.

An inlet duct includes a tubular main body formed by a compression-molded fibrous molded body. The main body includes an alternate layout region in which an air-impermeable high-compression portion and an air-permeable low-compression portion hat is compression-molded at a lower compressibility than a compressibility of the high-compression portion are alternately laid out in an axial direction of the main body. The alternate layout region is configured such that an arbitrary pair of points at an equal distance in the axial direction to a central position in an upstream region and a downstream region of the alternate layout region include only points that are both located in the low-compression portions and points one of which is located in the low-compression portion and the other one of which is located in the high-compression portion.

A variable intake system for a vehicle is provided and includes an air cleaner that filters air via a filter and supplies the air to an engine. A main duct is connected to the air cleaner to supply the air, and a variable valve has a housing that is coupled and mounted to a mounting aperture of a mounting part disposed on a front end of the filter of the air cleaner. An internal passage of the housing is opened by suction pressure of the engine in the mounting part to suction external air. A projection formed on the housing of the variable valve is inserted into a projection seat formed in the mounting part, so that the variable valve is secured to the mounting part.

Turbocharged engine water vapor ingestion control techniques determine a dew point of a charge air cooler (CAC) in an induction system of the engine based on measured humidity and temperature of a mixture of (i) air drawn into the induction system and (ii) exhaust gas produced by the engine that is cooled and recirculated by a low pressure cooled exhaust gas recirculation (LPCEGR) system of the engine back into the induction system. When the mixture temperature is less than the CAC dew point, a condensate accumulation in the CAC is determined. When the CAC condensate accumulation does not satisfy a set of one or more thresholds, the mixture temperature is increased. When the CAC condensate accumulation satisfies the set of one or more thresholds, an amount of the exhaust gas that is cooled and recirculated by the LPCEGR system is decreased until the mixture temperature meets the CAC dew point.

Cross-port air flow that improves engine fuel economy and reduces pumping losses during part-throttle operation can be implemented in various types of internal combustion engine systems using ports that interconnect the intake ports of different cylinders, thus allowing different cylinders to share combustion air. Cross-port air flow is commenced during part-throttle engine operation to disrupt the primary combustion air flow from each throttle to its associated cylinder, which reduces charge density and engine power. The engine compensates for the reduced power by incrementally opening the throttles, thus increasing the primary combustion air flow, reducing pumping losses and improving fuel economy.