Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation to an intake passage via a first exhaust manifold and exhaust gas to an exhaust passage via a second exhaust manifold. In one example, each of a first valve positioned in an exhaust gas recirculation (EGR) passage, the EGR passage coupled between the intake passage and the first exhaust manifold coupled to a first set of cylinder exhaust valves, and a second valve positioned in a flow passage coupled between the first exhaust manifold and the exhaust passage may be adjusted based on a measured pressure in the first exhaust manifold.

Systems are provided for aligning and assembling an exhaust gas recirculation (EGR) assembly with an engine intake housing. In one example, an intake system may include an EGR port housing for coupling the EGR assembly on an intake housing. The EGR port housing may include one or more alignment tabs on at least one side of the EGR port housing for aligning and guiding the EGR assembly during installation onto the intake housing.

Systems are provided for aligning and assembling an exhaust gas recirculation (EGR) assembly with an engine intake housing. In one example, an intake system may include an EGR port housing for coupling the EGR assembly on an intake housing. The EGR port housing may include one or more alignment tabs on at least one side of the EGR port housing for aligning and guiding the EGR assembly during installation onto the intake housing.

An internal combustion engine includes low and high pressure turbochargers connected in series. An engine cylinder has an intake valve that fluidly connects a main chamber of the engine cylinder with an outlet of the high pressure compressor through an intake passage. An exhaust gas recirculation passage is fluidly interconnected between exhaust and intake conduits. A pre-chamber encloses a spark plug and is fluidly open with the main chamber of the engine cylinder. A first fluid path extends from the intake passage directly to the pre-chamber, and a second fluid path extends from the intermediate passage directly to the pre-chamber.

An internal combustion engine includes low and high pressure turbochargers connected in series. An engine cylinder has an intake valve that fluidly connects a main chamber of the engine cylinder with an outlet of the high pressure compressor through an intake passage. An exhaust gas recirculation passage is fluidly interconnected between exhaust and intake conduits. A pre-chamber encloses a spark plug and is fluidly open with the main chamber of the engine cylinder. A first fluid path extends from the intake passage directly to the pre-chamber, and a second fluid path extends from the intermediate passage directly to the pre-chamber.

The invention relates to a method for a vehicle system (100) comprising an internal combustion engine (10) having a turbocharger unit (110) connected thereto, a turbocompound unit (120) arranged to receive exhaust gas flowing from the turbocharger unit (110), and an exhaust gas recirculation system (130). The method comprises controlling the exhaust gas flowing through the exhaust gas recirculation system (130) by determining a pressure difference, and, if the determined pressure difference is above a predetermined threshold value directing the recirculated exhaust gas to an air intake line (160) downstream a charge air cooler (170), and, if the determined pressure difference is not above the predetermined threshold value directing the recirculated exhaust gas to a compressor (114) of the turbocharger unit (110).

The invention relates to a method for a vehicle system (100) comprising an internal combustion engine (10) having a turbocharger unit (110) connected thereto, a turbocompound unit (120) arranged to receive exhaust gas flowing from the turbocharger unit (110), and an exhaust gas recirculation system (130). The method comprises controlling the exhaust gas flowing through the exhaust gas recirculation system (130) by determining a pressure difference, and, if the determined pressure difference is above a predetermined threshold value directing the recirculated exhaust gas to an air intake line (160) downstream a charge air cooler (170), and, if the determined pressure difference is not above the predetermined threshold value directing the recirculated exhaust gas to a compressor (114) of the turbocharger unit (110).

An intake system of a vehicle includes: an intake manifold having a plurality of runners for supplying intake gas to a multiple-cylinder engine; a surge tank cover coupled to the intake manifold to define a surge tank communicating with the plurality of runners via the intake manifold; an intake air inlet formed on the intake manifold as a passage through which intake air flows into the surge tank; an intake outlet formed on the intake manifold as a passage through which intake air sequentially passing through the intake air inlet, the surge tank, and the plurality of runners, and is discharged to the engine as the intake gas; a gas inlet which is a passage formed on the intake manifold and selectively receiving recirculation exhaust gas; and a gas chamber formed on the intake manifold so that the recirculation exhaust gas flows in through the gas inlet.

An intake system of a vehicle includes: an intake manifold having a plurality of runners for supplying intake gas to a multiple-cylinder engine; a surge tank cover coupled to the intake manifold to define a surge tank communicating with the plurality of runners via the intake manifold; an intake air inlet formed on the intake manifold as a passage through which intake air flows into the surge tank; an intake outlet formed on the intake manifold as a passage through which intake air sequentially passing through the intake air inlet, the surge tank, and the plurality of runners, and is discharged to the engine as the intake gas; a gas inlet which is a passage formed on the intake manifold and selectively receiving recirculation exhaust gas; and a gas chamber formed on the intake manifold so that the recirculation exhaust gas flows in through the gas inlet.

This air intake apparatus includes an air intake apparatus main body including a plurality of pieces bonded to each other along a split plane and an external gas passage formed inside the air intake apparatus main body by bonding the plurality of pieces to each other and including an external gas receiving port that directly receives external gas from a cylinder head and an external gas introduction port that introduces the external gas into a surge tank.