Methods and systems for an engine intake system. In one example, a system comprises a first charge air cooler arranged upstream of a second charge air cooler. The first charge air cooler is configured to provide thermal transfer between a compressed charge air and a fresh intake air.

A heat exchanger for providing charged air to a vehicle is described. The heat exchanger includes a plurality of heat exchange elements, and at least one passage. The plurality of heat exchange elements is stacked together in between a pair of side plates, and ends of the plurality of heat exchange elements are received in a pair of headers to configure a fluid circuit. The at least one passage is formed in a first heat exchange element amongst the plurality of heat exchange elements, along with the plurality of heat exchange elements and the first heat exchange element is formed above at least few heat exchange elements of the plurality of heat exchange elements.

An exhaust gas recirculation (EGR) system with independent intake air compressor includes an engine having at least one cylinder communicating with a cylinder exhaust passage. A bypass valve positioned in the cylinder exhaust passage when selectively aligned in a first position directs all exhaust from the at least one cylinder to an exhaust passage and when selectively aligned in a second position directs all exhaust from the at least one cylinder into an EGR dedicated passage. An intake manifold is in communication with the EGR dedicated passage. An electrically powered eBoost compressor when activated receives atmospheric air and generates a required boosted air pressure flow during a mid-load engine operation portion and a high-load engine operation portion for introduction into the intake manifold independently of the EGR dedicated passage. The eBoost compressor is deactivated during a low-load engine operation portion. A motor-generator generates at least a portion of the power for the eBoost compressor.

Methods and systems are provided for a tempering circuit. A system comprises where the tempering circuit is fluidly coupled to each of an engine cooling circuit, an EGR cooler, and an EGR valve. The tempering circuit comprising a plurality of control valves for selectively adjusting tempering medium flow to various portions of the tempering circuit.

Methods and systems are provided for variable thermal capacity charge air cooler (VTC-CAC). In one example, the VTC-CAC includes a plurality of cooling channels and an integrated bypass that diverts air around the cooling channels. Division of boosted intake air between the cooling channels and the bypass is regulated by a positioning of dual-gate mechanism that is adjusted in response to manifold charge temperature.

Methods and systems are provided for boosted engine systems. In one example, a system may include a pressurized air induction system with two pathways, the first for delivering ambient and the second for delivering boosted air to the engine. The pressurized air induction system is also adapted to store boosted air for faster supply of boost pressure in the event of demand for greater engine torque.

An aspect includes a dual valve system that includes a first valve body and a first valve disc operably disposed within the first valve body, where the first valve disc has a first disc geometry. The dual valve system also includes a second valve body and a second valve disc operably disposed within the second valve body, where the second valve disc has a second disc geometry. The dual valve system further includes a mechanical linkage operably coupled to the first valve disc and the second valve disc, where the second disc geometry differs from the first disc geometry such that opening of a first flow area between the first valve body and the first valve disc occurs prior to opening of a second flow area between the second valve body and the second valve disc responsive to movement of the mechanical linkage.

Methods and systems are provided for boosted engine systems. In one example, a system may include a pressurized air induction system with two pathways, the first for delivering ambient and the second for delivering boosted air to the engine. The pressurized air induction system is also adapted to store boosted air for faster supply of boost pressure in the event of demand for greater engine torque.

An aspect includes an offset parallel valve system that includes a first valve body and a first valve disc operably disposed within the first valve body. The offset parallel valve system also includes a second valve body in parallel with the first valve body and a second valve disc operably disposed within the second valve body, where the second valve disc is laterally offset from the first valve disc. A linkage system is operably coupled to the first valve disc and the second valve disc. The linkage system includes an armature coupled to a grooved linkage member having a first groove and a second groove. The first groove delays movement of the second valve disc as the first valve disc rotates, and the second groove controls a rotation angle of the second valve disc.

An aspect includes an offset parallel valve system that includes a first valve body and a first valve disc operably disposed within the first valve body. The offset parallel valve system also includes a second valve body in parallel with the first valve body and a second valve disc operably disposed within the second valve body, where the second valve disc is laterally offset from the first valve disc. A linkage system is operably coupled to the first valve disc and the second valve disc. The linkage system includes an armature coupled to a grooved linkage member having a first groove and a second groove. The first groove delays movement of the second valve disc as the first valve disc rotates, and the second groove controls a rotation angle of the second valve disc.