Fresh gas supply device for an internal combustion engine having an exhaust gas turbocharger, and method for the control thereof

A method for regulating an outlet pressure in an outlet of a fresh-gas supply device, the method comprising the steps of:

• determining an inlet pressure in a charge-air inlet and an outlet pressure in the outlet of the fresh-gas supply device with pressure sensors;
• determining operating parameters of an operating state of an internal combustion engine arranged downstream of the outlet of the fresh-gas supply device;
• blocking a connection of the outlet to the charge-air inlet by closing an adjusting device arranged in the connection of the outlet to the charge-air inlet if one or more determined operating parameters require an increased acceleration of the internal combustion engine;
• opening a connection of the outlet to the compressed-air inlet by opening at least one valve and a proportional valve during a pressure build-up phase;
• regulating the outlet pressure after opening the connection of the outlet to the compressed-air inlet by comparing the outlet pressure with a nominal pressure and by adjusting the proportional valve during a pressure-regulating phase in response to the result of the comparison of the outlet pressure with the nominal pressure;
• and
• when the inlet pressure has reached a defined and parameterizable value, closing the connection of the outlet to the compressed-air inlet by closing the at least one valve and the proportional valve and opening the connection of the outlet to the charge-air inlet by opening the adjusting device.

A fresh-gas supply device for use in an internal combustion engine having an exhaust-gas turbocharger, comprising:

• a charge-air inlet for admission of charge air from the exhaust-gas turbocharger;
• a compressed-air inlet for admission of compressed air;
• an outlet connectable via an adjusting device to the charge-air inlet and via a flow-regulating device to the compressed-air inlet, the flow-regulating device being closed when the adjusting device is partially open or fully open;
• and
• a control device for controlling the adjusting device and the flow-regulating device as a function of operating states of the internal combustion engine,
• wherein the flow-regulating device has at least two valves for opening and for closing off the compressed-air inlet and for adjusting the outlet pressure in the outlet, said at least two valves being controllable separately by the control device via in each case one control valve.

A fresh-gas supply device for use in an internal combustion engine having an exhaust-gas turbocharger, comprising:

• a charge-air inlet for admission of charge air from the exhaust-gas turbocharger;
• a compressed-air inlet for admission of compressed air;
• an outlet connectable via an adjusting device to the charge-air inlet and via a flow-regulating device to the compressed-air inlet, the flow-regulating device being closed when the adjusting device is partially open or fully open;
• and
• a control device for controlling the adjusting device and the flow-regulating device as a function of operating states of the internal combustion engine,
• wherein the flow-regulating device has at least one valve for opening and for closing off the compressed-air inlet and has a proportional valve, which is connected downstream in the flow direction, for adjusting an outlet pressure in the outlet.