Methods and systems are provided for determining a cylinder air charge based on a boost manifold volume of an engine. In one example, a method may include inducing a compressor surge event, and updating the boost manifold volume in response to a difference between an actual surge pressure and an expected surge pressure. The method further includes determining the cylinder air charge based on the updated boost manifold volume.

Methods and systems are provided for adjusting an active casing treatment of a compressor responsive to a predicted engine condition. In one example, a controller may actuate a sleeve of a variable geometry compressor casing to a position selected based on each of a compressor pressure ratio and a mass flow through the compressor, as well as driver behavior and predicted road conditions; and adjust each of an EGR actuator and a boost actuator based on the selected position to maintain the compressor pressure ratio during the actuating.

A control device is provided capable of reliably preventing occurrence of a surging state by judging a possibility of the surging state in a relatively easy manner and promptly executing a surging state avoidance control. When a supercharging pressure decreasing state in which a target supercharging pressure decreases is detected, an operating speed of a wastegate valve is determined based on a detected engine rotational speed. That is, by lowering the operating speed as the engine rotational speed lowers, reduction in flow rate of the air passing through a compressor is prevented, and the occurrence of the surging state is reliably prevented. By lowering the operating speed instead of changing a target opening degree of the wastegate valve, a maximum opening degree of the wastegate valve can be suppressed, and responsiveness in the case where an acceleration request is made immediately after deceleration of an engine can be improved.

A valve arrangement included in an engine peripheral structure provided with an intake system in an engine room, includes: a low-pressure intake passage of the intake system, arranged around an engine main body mounted in the engine room and connected to a passage upstream of a supercharger of the intake system in an intake direction; a high-pressure intake passage of the intake system, connected to a passage downstream of the supercharger in the intake direction; and an air bypass valve connected between the low-pressure intake passage and the high-pressure intake passage. The air bypass valve is fixed on a part of the low-pressure intake passage facing the engine main body.

An air handling arrangement in a two-stroke cycle, opposed-piston engine with uniflow scavenging and constructed for heavy-duty operation includes sequentially arranged turbochargers in series with a supercharger, in some aspects, the air handling system is equipped with an EGR channel.

Methods and systems are provided for a supercharged internal combustion engine having staged boosting devices. In one example, a system may include an engine coupled to an intake system for receiving charge air and an exhaust system for discharging exhaust gases, an electrically driven compressor arranged in the intake system upstream of a turbocharger compressor, a bypass line, including a bypass valve, coupled across the electrically driven compressor, a throttle arranged at an inlet of the electrically driven compressor, and an exhaust gas recirculation system that couples the exhaust system downstream of the exhaust turbine to the intake system upstream of the electrically driven compressor via a first recirculation branch and between the electrically driven compressor and the turbocharger compressor via a second recirculation branch. In this way, the electrically driven compressor may be operated to reduce condensate formation at an inlet of the turbocharger compressor.

A mixture supply system with quantitative mixture control comprises a charging system connectable to an internal combustion engine, comprising a bypass and a bypass valve, and a valve train for periodically actuating an intake valve of the internal combustion engine. A valve control time of the intake valve is controllable by the valve train. The system is configured to at least partially close the bypass valve and change the valve control time for extending the valve opening duration upon increase of an engine load, to at least partially open the bypass valve during and/or after expiration of a valve train latency time, and/or to at least partially open the bypass valve and change the valve control time for decreasing the valve opening duration upon an decrease of an engine load, and to at least partially close the bypass valve during and/or after expiration of a valve train latency time.

A control apparatus for an internal combustion engine is configured, when regenerative processing by an electric supercharger is executed, to control the opening degree of a throttle valve, the opening degree of an intake bypass valve and the power generation load on a motor generator to set the opening degree of the intake bypass valve and the power regeneration load so that a second intake pressure which is an intake pressure downstream of an electric compressor and upstream of a turbo compressor does not fall below a second specific pressure value, based on a request intake air flow rate of the internal combustion engine and the second intake pressure.

A supercharging device for an engine includes an electric supercharger which supercharges intake air, an intercooler which cools intake air discharged from the electric supercharger; and an intake manifold which is disposed substantially horizontally, and is configured to communicate between a downstream end of the intercooler in an intake air flow direction, and intake ports. The downstream end of the intercooler is located on a lower end of the intercooler. The downstream end of the intercooler is disposed substantially at the same height as an upstream end of the intake ports. The electric supercharger is disposed below the intercooler along a surface of the engine on an intake side where the intake ports are opened.

The turbocharged engine control device comprises a basic target torque-deciding part for deciding a basic target torque based on a driving state of a vehicle including an accelerator pedal operation state; a torque reduction amount-deciding part for deciding a torque reduction amount based on a driving state of the vehicle other than the accelerator pedal operation state; a final target torque-deciding part for deciding a final target torque based on the decided basic target torque and the decided torque reduction amount; and an engine output control part for controlling the engine so as to cause the engine to output the decided final target torque, wherein the engine output control part is operable, when an operating state of the engine falls within a supercharging region where supercharging by a compressor, to restrict control of the engine corresponding to a change in the torque reduction amount.