An engine assembly comprises: an internal combustion engine having: a combustion chamber; an air inlet for supplying air to the combustion chamber; a fuel injector for supplying fuel to the combustion chamber; an exhaust outlet for releasing exhaust gas from the combustion chamber and a rotatable drive shaft, wherein combustion of fuel in air within the combustion chamber results in rotation of the drive shaft. The engine assembly further comprises: a turbocharger system comprising: a turbine configured to recover energy from exhaust gas provided via the exhaust gas outlet; and a turbocharger compressor configured to receive energy from the turbine and thereby to compress air for use in combustion of fuel in the combustion chamber. The engine assembly further comprises: a supercharger system comprising a supercharger compressor configured to receive kinetic energy from the drive shaft and to compress air for use in combustion in the combustion chamber. The engine assembly further comprises: a flywheel configured for kinetic energy storage; a first linkage between the drive shaft and the flywheel, wherein the linkage comprises a variable belt drive; and a second linkage between the first linkage and the supercharger compressor.

An engine assembly comprises: an internal combustion engine having: a combustion chamber; an air inlet for supplying air to the combustion chamber; a fuel injector for supplying fuel to the combustion chamber; an exhaust outlet for releasing exhaust gas from the combustion chamber and a rotatable drive shaft, wherein combustion of fuel in air within the combustion chamber results in rotation of the drive shaft. The engine assembly further comprises: a turbocharger system comprising: a turbine configured to recover energy from exhaust gas provided via the exhaust gas outlet; and a turbocharger compressor configured to receive energy from the turbine and thereby to compress air for use in combustion of fuel in the combustion chamber. The engine assembly further comprises: a supercharger system comprising a supercharger compressor configured to receive kinetic energy from the drive shaft and to compress air for use in combustion in the combustion chamber. The engine assembly further comprises: a flywheel configured for kinetic energy storage; a first linkage between the drive shaft and the flywheel, wherein the linkage comprises a variable belt drive; and a second linkage between the first linkage and the supercharger compressor.

Proposed is a gas heat-pump system including: a compressor of an air conditioning module; a gas engine generating a drive force of the compressor; and a turbocharger primarily first-level pressure to a fuel-to-air mixture and supplying the fuel-to-air mixture to the gas engine or applying second-level pressure to the fuel-to-air mixture to which the first-level pressure is applied and supplying the fuel-to-air mixture to the gas engine.

Proposed is a gas heat-pump system including: a compressor of an air conditioning module; a gas engine generating a drive force of the compressor; and a turbocharger primarily first-level pressure to a fuel-to-air mixture and supplying the fuel-to-air mixture to the gas engine or applying second-level pressure to the fuel-to-air mixture to which the first-level pressure is applied and supplying the fuel-to-air mixture to the gas engine.

A compressor for a turbocharger includes an inlet-adjustment mechanism in an air inlet for the compressor, operable to move between an open position and a closed position in the air inlet. The compressor housing upstream of the inlet-adjustment mechanism defines a series of acoustic cavities, and openings are defined in the compressor housing wall leading into the acoustic cavities. The openings and cavities are aimed at mitigating noise and flow pulsation in the air inlet caused when the inlet-adjustment mechanism is adjusted to the closed position to effectively reduce the inlet diameter approaching the compressor wheel.

A compressor for a turbocharger includes an inlet-adjustment mechanism in an air inlet for the compressor, operable to move between an open position and a closed position in the air inlet. The compressor housing upstream of the inlet-adjustment mechanism defines a series of acoustic cavities, and openings are defined in the compressor housing wall leading into the acoustic cavities. The openings and cavities are aimed at mitigating noise and flow pulsation in the air inlet caused when the inlet-adjustment mechanism is adjusted to the closed position to effectively reduce the inlet diameter approaching the compressor wheel.

A control unit configured to control an electric turbocharger and an EGR valve. While an internal combustion engine is stopped, an oxygen-free period, which is a period during which oxygen surrounding an exhaust gas purifier used for an oxidation reaction runs out, is estimated based on a temperature of the exhaust gas purifier. Before entering the oxygen-free period, the EGR valve is opened and the electric turbocharger is driven. Air surrounding the exhaust gas purifier is replaced with fresh air. After replacement with the fresh air has been completed, the electric turbocharger is stopped.

An electric turbomachine for use with an internal combustion engine, a turbocharger or a fuel cell e-compressor, said electric turbomachine comprising: a high-speed electrical machine located internally within a housing that is arranged to be rotationally drive a shaft (30) about a rotational axis (R); a compressor that is arranged to compress fluid within a turbo compressor when it is rotationally driven about the rotational axis (R) by the shaft; and a power electronics assembly (190) that is arranged to supply power to the electrical machine; a control assembly (230) that is arranged to control the power supplied by the power electronics assembly to the electrical machine, wherein the power electronics assembly is mounted externally on the housing (50) on a first surface of the housing and the control assembly is mounted externally on the housing on a second surface of the housing.

An electric turbomachine for use with an internal combustion engine, a turbocharger or a fuel cell e-compressor, said electric turbomachine comprising: a high-speed electrical machine located internally within a housing that is arranged to be rotationally drive a shaft (30) about a rotational axis (R); a compressor that is arranged to compress fluid within a turbo compressor when it is rotationally driven about the rotational axis (R) by the shaft; and a power electronics assembly (190) that is arranged to supply power to the electrical machine; a control assembly (230) that is arranged to control the power supplied by the power electronics assembly to the electrical machine, wherein the power electronics assembly is mounted externally on the housing (50) on a first surface of the housing and the control assembly is mounted externally on the housing on a second surface of the housing.

A method of manufacturing a casing of a turbocharger includes: a steam treatment step of subjecting at least one of a turbine housing and a bearing housing to a steam treatment to form an oxide film on the at least one of the turbine housing and the bearing housing before assembling the turbine housing, the bearing housing and a compressor housing; and an assembling step of assembling the turbine housing, the bearing housing and the compressor housing.