Some embodiments of the teachings herein include an apparatus for diagnosing bypass valve failure in an electric supercharger with a motor and an electric compressor comprising: a bypass valve on a bypass line branching from an intake line with the electric supercharger; and a control unit which assesses the vehicle-state information to determine whether failure criteria of a bypass valve start are satisfied. If the failure criteria are satisfied, the control unit transmits ‘open’ or ‘close’ control instructions to the bypass valve and transmits, to the electric supercharger, a specific rotational-speed target value for determining whether the bypass valve is in the normal open state or the normal closed state, thereby determining whether the bypass valve is subject to stuck-open failure or stuck-closed failure.

A supercharger for an internal combustion engine includes two compressors, each having a compressor wheel mounted on a common shaft, and a mechanical linkage for transmitting power from a running engine to the common shaft to provide a desired boost with less torque by using two smaller compressor wheels rather than a single larger compressor wheel.

A supercharger for an internal combustion engine includes two compressors, each having a compressor wheel mounted on a common shaft, and a mechanical linkage for transmitting power from a running engine to the common shaft to provide a desired boost with less torque by using two smaller compressor wheels rather than a single larger compressor wheel.

An exhaust gas recirculation (EGR) system that utilizes an insulated separation wall that separates the hot, humid EGR gas duct from the cool, dry inlet air duct in the upstream proximity of the compressor inlet of the associated turbocharger compressor. This insulated separation wall inhibits the condensation of water droplets and the formation of ice particles near the mixing point of the EGR gases and inlet air in the upstream proximity of the compressor inlet, such that the turbocharger compressor wheel, blades, and other components are not subsequently damaged by the condensed water droplets or formed ice particles. The added insulation in this cold sink area essentially thermally isolates the hot, humid EGR gas flow from the cool, dry inlet air flow until the actual mixing point of the flows.

An exhaust gas recirculation (EGR) system that utilizes an insulated separation wall that separates the hot, humid EGR gas duct from the cool, dry inlet air duct in the upstream proximity of the compressor inlet of the associated turbocharger compressor. This insulated separation wall inhibits the condensation of water droplets and the formation of ice particles near the mixing point of the EGR gases and inlet air in the upstream proximity of the compressor inlet, such that the turbocharger compressor wheel, blades, and other components are not subsequently damaged by the condensed water droplets or formed ice particles. The added insulation in this cold sink area essentially thermally isolates the hot, humid EGR gas flow from the cool, dry inlet air flow until the actual mixing point of the flows.

A system for feeding operating gas to a drive (1) of a motor vehicle, including an atmosphere-side suction inlet (2a) for air under atmospheric pressure, and a feed line (2) for the operating gas to the drive (1) under an operating pressure, the operating gas which is conducted to the drive comprising at least part of the air which is sucked in, at least part of the operating gas being conducted through a turbomachine (3) upstream of the drive (1) in a first operating type, the turbomachine (3) comprising an electric generator (4), and the turbomachine (3) being operated in a second operating type as a compressor for the operating gas, an actuable valve arrangement (5) being provided, at least part of the air which is sucked in being conducted in a turbine direction (T) through the turbomachine (3) in a first position of the valve arrangement (5), and at least part of the air which is sucked in being conducted in a reversed compressor direction (V) through the turbomachine (3) in a second position of the valve arrangement (5).

A turbocharger includes a shaft extending along an axis, a compressor wheel coupled to a first end of the shaft, a turbine wheel coupled to a second end of the shaft and having a first diameter; and a bearing housing extending about the shaft. The bearing housing is disposed between the compressor wheel and the turbine wheel. The bearing housing having a thermal dam having a volume extending circumferentially about the shaft and disposed proximate to the second end of the shaft between the compressor wheel and the turbine wheel. The thermal dam has a second diameter extending radially from the shaft. Moreover, the second diameter of the thermal dam is between 1.1 and 1.2 times greater than the first diameter of the turbine wheel.

A turbocharger includes a shaft extending along an axis, a compressor wheel coupled to a first end of the shaft, a turbine wheel coupled to a second end of the shaft and having a first diameter; and a bearing housing extending about the shaft. The bearing housing is disposed between the compressor wheel and the turbine wheel. The bearing housing having a thermal dam having a volume extending circumferentially about the shaft and disposed proximate to the second end of the shaft between the compressor wheel and the turbine wheel. The thermal dam has a second diameter extending radially from the shaft. Moreover, the second diameter of the thermal dam is between 1.1 and 1.2 times greater than the first diameter of the turbine wheel.

An internal combustion engine including a block, a head coupled to the block to at least partially define a cylinder therebetween, and a compressor assembly having an inlet and an outlet in fluid communication with the cylinder. Where the compressor is operable in a first mode, in which a first portion of the gasses exiting the outlet are directed to the cylinder and a second portion of the gasses exiting the outlet is recirculated back to the inlet.

An internal combustion engine including a block, a head coupled to the block to at least partially define a cylinder therebetween, and a compressor assembly having an inlet and an outlet in fluid communication with the cylinder. Where the compressor is operable in a first mode, in which a first portion of the gasses exiting the outlet are directed to the cylinder and a second portion of the gasses exiting the outlet is recirculated back to the inlet.