A turbocharged engine system with electric compressor arranged to inject a compressed fluid into the exhaust subsystem upstream of the turbine of the turbocharger such that, in use, the compressed fluid injected by the electric compressor into the exhaust subsystem maintains the speed of or accelerates the turbine, thereby maintaining or increasing the boost pressure supplied to the turbocharged internal combustion engine. A method of controlling the boost pressure supplied to an internal combustion engine by a turbocharger, said method comprising the steps of: producing a stream of compressed fluid; injecting the stream of compressed fluid into an exhaust stream of the internal combustion engine to produce a pressure-boosted exhaust stream; and controlling the speed of a turbine of the turbocharger using the pressure-boosted exhaust stream to control the boost pressure supplied to the internal combustion engine

A turbocharged engine system with electric compressor arranged to inject a compressed fluid into the exhaust subsystem upstream of the turbine of the turbocharger such that, in use, the compressed fluid injected by the electric compressor into the exhaust subsystem maintains the speed of or accelerates the turbine, thereby maintaining or increasing the boost pressure supplied to the turbocharged internal combustion engine. A method of controlling the boost pressure supplied to an internal combustion engine by a turbocharger, said method comprising the steps of: producing a stream of compressed fluid; injecting the stream of compressed fluid into an exhaust stream of the internal combustion engine to produce a pressure-boosted exhaust stream; and controlling the speed of a turbine of the turbocharger using the pressure-boosted exhaust stream to control the boost pressure supplied to the internal combustion engine

In a turbocharged internal combustion engine system including an eCompressor as a secondary air pump (SAP) for injecting air into an exhaust system of the ICE, controllable valves enable the turbocharger compressor and the SAP to provide two-stage compressed air to the intake of the ICE in certain operating conditions, or to feed the air via a secondary air injection line (SAI line) into the exhaust system in other conditions. A conduit is tapped off the discharge of the SAP and connects with discharge ducting from the turbocharger compressor, and an on/off valve configured for defined leakage in the “off” position controls flow through the conduit. When the air from the SAP is needed only for injection air, the leakage through the leaky valve into the intake system suppresses surge of the SAP.

A turbocharger (1) includes a turbine wheel (3) driven by exhaust gas, first and second compressor wheels (4, 5) coaxially coupled to the turbine wheel (3) via a shaft member (6), a compressor housing (8) accommodating the first and second compressor wheels (4, 5) and having defined therein a communication passage (17) through which air compressed by the first compressor wheel (4) flows to the second compressor wheel (5), and an electric motor (11) arranged in the communication passage (17) and using the shaft member (6) as a rotation shaft thereof.

A turbocharger (1) includes a turbine wheel (3) driven by exhaust gas, first and second compressor wheels (4, 5) coaxially coupled to the turbine wheel (3) via a shaft member (6), a compressor housing (8) accommodating the first and second compressor wheels (4, 5) and having defined therein a communication passage (17) through which air compressed by the first compressor wheel (4) flows to the second compressor wheel (5), and an electric motor (11) arranged in the communication passage (17) and using the shaft member (6) as a rotation shaft thereof.

The present invention relates to an electric compressor (9, 17) including a shaft (13) rotated by an electric motor by means of bearings (16), the shaft rotating a compressor wheel (14), the compressor (9) including two sealing segments (29a, 29b) mounted around the shaft (13) between the bearings (16) and the compressor wheel (14) and including a vent hole (31, 35, 38) for circulation of pollutant flows toward the outside of the compressor, the inlet of which is arranged between the two sealing segments, the vent hole including a non-return element (36).

A supercharging unit for an internal combustion engine has a high-pressure turbine which drives a high-pressure compressor so as to perform a rotational movement about a first axis and through which exhaust gas of the internal combustion engine flows, and having a low-pressure turbine which drives a low-pressure compressor so as to perform a rotational movement about a second axis and through which exhaust gas flows. The high-pressure turbine is arranged rotationally conjointly on a first shaft, and the high-pressure compressor is arranged rotationally conjointly on a second shaft, wherein the first and the second shaft are arranged parallel to one another and are arranged offset with respect to one another, wherein the first and the second shaft are mechanically operatively connected to one another such that the high-pressure compressor can be driven by the high-pressure turbine.

A supercharging unit for an internal combustion engine has a high-pressure turbine which drives a high-pressure compressor so as to perform a rotational movement about a first axis and through which exhaust gas of the internal combustion engine flows, and having a low-pressure turbine which drives a low-pressure compressor so as to perform a rotational movement about a second axis and through which exhaust gas flows. The high-pressure turbine is arranged rotationally conjointly on a first shaft, and the high-pressure compressor is arranged rotationally conjointly on a second shaft, wherein the first and the second shaft are arranged parallel to one another and are arranged offset with respect to one another, wherein the first and the second shaft are mechanically operatively connected to one another such that the high-pressure compressor can be driven by the high-pressure turbine.

An electrically assisted turbocharger (10) includes an air cooling system for cooling an electric motor (52) housed within a motor chamber (54) in a bearing housing (12). An inlet volute (76) is formed in the bearing housing (12) on a first side of the electric motor (52) and an outlet volute (78) is formed in the bearing housing (12) on a second side of the electric motor (52) opposite from the inlet volute (76). The inlet volute (76) accelerates cooling air that is fed into the inlet volute (76) and directs the cooling air into the motor chamber (54). The cooling air travels in an axial direction through the motor chamber (54) from the inlet volute (76) to the outlet volute (78), thereby cooling the electric motor (52). The outlet volute (78) decelerates the cooling air and directs the cooling air out of the motor chamber (54).

A turbocharger includes a two-stage serial compressor having a first impeller and a second impeller affixed to a shaft and arranged in series for a two-stage compression of air, an exhaust gas-driven turbine having a turbine wheel affixed to the shaft, and an electric motor mounted on the shaft for assisting the turbine in rotatably driving the compressor.