Fresh Gas Supply Device for an Internal Combustion Engine Having an Exhaust Gas Turbocharger, and Method for the Control Thereof

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 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, and operating parameters of an operating state of the internal combustion engine;
• blocking the connection of the outlet to the charge-air inlet by closing the adjusting device if one or more determined operating parameters require an increased acceleration of the internal combustion engine;
• opening the 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 and regulating the outlet pressure by comparing the outlet pressure with a nominal pressure by adjusting the proportional valve during a pressure-regulating phase;
• and
• 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 if the inlet pressure has reached a defined and parameterizable value.

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

• determining operating parameters of an operating state of the internal combustion engine;
• blocking the connection of the outlet to the charge-air inlet by closing the adjusting device if one or more determined operating parameters require an acceleration of the internal combustion engine;
• opening the connection of the outlet to the compressed-air inlet by fully opening the at least two valves in a pressure build-up phase and regulating the outlet pressure by comparing said pressure with a nominal pressure during a pressure-regulating phase by separately opening and closing at least two valves or by adjusting at least one of the at least two valves between an open and closed position;
• and
• closing the connection of the outlet to the compressed-air inlet by closing the at least two valves and opening the connection of the outlet to the charge-air inlet by opening the adjusting device if the inlet pressure has reached a defined and parameterizable value.