Systems and methods are provided for improving a purge flow from a canister via a canister purge valve in a boosted engine. One method comprises adjusting an opening of a shut-off valve to regulate compressor bypass flow through an aspirator, during boosted conditions, to generate vacuum at the aspirator. The vacuum is applied downstream of a solenoid valve and upstream of a sonic choke within a canister purge valve.

Methods and systems are provided for purging a fuel vapor canister. In one example, a method may include during boosted engine operating conditions, utilizing regulated compressed air from an engine intake to purge fuel vapors stored in the fuel vapor canister. Further, during non-boosted condition, regulated air from the intake may be utilized to purge the fuel vapor canister. The purged fuel vapors and intake air may be delivered to upstream of a compressor when operating with boost, or to an intake manifold when operating without boost.

A supercharged internal combustion engine includes an intake tract and a throttle element. Between the compressor and the throttle element, the intake tract is gas-conductively connected on the low-pressure side to a first line and on the high-pressure side to a second line via an overrun air recirculation valve. A fuel tank having an activated carbon filter is provided for supplying fuel to the internal combustion engine, the fuel tank being gas-conductively connected via a valve to a tank venting valve. Between the compressor and the throttle element, the intake tract is gas-conductively connected on the low-pressure side to a third line and on the high-pressure side to a fourth line via the tank venting valve. The overrun air recirculation valve and the tank venting valve are arranged in parallel in terms of flow and the first and third lines and the second and fourth lines are, at least in sections, the same lines.

A turbocharger includes an annular bypass volute to allow exhaust gas to bypass the turbine wheel. An annular bypass valve is disposed in the bypass volute. The bypass valve comprises a fixed annular valve seat and a rotary annular valve member arranged coaxially with the valve seat. The valve member is disposed against the valve seat and is rotatable about the axis for selectively varying a degree of alignment between respective orifices in the valve seat and valve member. The valve member is rotatably driven by a rotary actuator and drive linkage that rotates about an axis parallel to and offset from the axis about which the valve member rotates.

A method and apparatus is provided for regulating stable operation of an exhaust-gas turbocharger of an internal combustion engine having a fresh-gas supply device, a switchover valve, a control device, a compressor for generating compressed air and an air-processing unit with a discharge valve. The compressor is operated in a suction intake mode in which the compressor is connected to an air inlet, and based on monitored operating parameters, the switchover valve switches the compressor from the suction intake mode into a pressure-charged in which the compressor is connected to an exhaust-gas turbocharger compressor. Based on monitored operating parameters when in the pressure-charged mode, the switchover valve switches the compressor from the pressure-charged mode into the suction intake mode.

Methods and systems are provided for enhancing crankcase ventilation in a boosted engine. During boosted conditions, a crankcase may be ventilated via vacuum generated at an aspirator coupled in a compressor bypass passage. However, when the aspirator is plugged, pressure in the crankcase may be relieved by flowing crankcase gases through an aspirator bypass passage.

Exhaust aftertreatment assemblies and methods of manufacturing and operating exhaust aftertreatment assemblies. The exhaust aftertreatment assembly includes a reductant delivery device, a reductant source fluidly coupled to the reductant delivery device, a mixing chamber positioned between the reductant delivery device and the reductant source and thereby fluidly coupling the reductant source to the reductant delivery device, and a compressed air source fluidly coupled to the mixing chamber upstream of the mixing chamber with respect to the reductant delivery device. The compressed air source provides compressed air to mix with reductant in the mixing chamber.

A turbine housing assembly can include an inlet conduit portion that defines an inlet passage, where the inlet passage is in fluid communication with a cavity via an opening surrounded by a valve seat; a volute portion that defines a volute that is in fluid communication with the inlet passage and a turbine wheel space; a valve, where a shaft is rotatably supported by a bushing disposed in a bore and where, in a closed state of the valve, an arm is disposed in the cavity; and a controller operatively coupled to a control arm to transition the valve between the closed state and an open state, where, in the open state, a plug moves into the inlet passage to restrict flow between an inlet opening and a volute and to direct flow to the cavity, where the cavity is in fluid communication with a treatment unit.

A turbine housing assembly can include an inlet conduit portion that defines an inlet passage, where the inlet passage is in fluid communication with a cavity via an opening surrounded by a valve seat; a volute portion that defines a volute that is in fluid communication with the inlet passage and a turbine wheel space; a valve, where a shaft is rotatably supported by a bushing disposed in a bore and where, in a closed state of the valve, an arm is disposed in the cavity; and a controller operatively coupled to a control arm to transition the valve between the closed state and an open state, where, in the open state, a plug moves into the inlet passage to restrict flow between an inlet opening and a volute and to direct flow to the cavity, where the cavity is in fluid communication with a treatment unit.

A turbine housing assembly can include an inlet conduit portion that defines an inlet passage, where the inlet passage is in fluid communication with a cavity via an opening surrounded by a valve seat; a volute portion that defines a volute that is in fluid communication with the inlet passage and a turbine wheel space; a valve, where a shaft is rotatably supported by a bushing disposed in a bore and where, in a closed state of the valve, an arm is disposed in the cavity; and a controller operatively coupled to a control arm to transition the valve between the closed state and an open state, where, in the open state, a plug moves into the inlet passage to restrict flow between an inlet opening and a volute and to direct flow to the cavity, where the cavity is in fluid communication with a treatment unit.