Method and system for emergency ventilating and pressurizing an aircraft cabin

A system for emergency ventilating and pressurizing an aircraft cabin, comprising:

• a device for determining a cabin pressure prevailing within the aircraft cabin,
• a device for determining an ambient pressure prevailing in an aircraft environment, and
• an electrical control device, the control device being adapted to:
• initiate descent of the aircraft, when the cabin pressure falls below a predetermined threshold value,
• initiate a supply of ambient air from the aircraft environment into the aircraft cabin, when, during descent of the aircraft, a differential pressure between the cabin pressure and the ambient pressure falls below a first calculated threshold value, and
• feedback-control the supply of ambient air from the aircraft environment into the aircraft cabin based on a feedback signal indicative of a flow of ambient air from the aircraft environment into the aircraft cabin by adjusting a flow cross-section of an emergency ram inlet or of a valve allowing the supply of ambient air into the aircraft cabin and controlling an operation of an air outflow valve of a cabin pressurization system of the aircraft, such that a flow of ambient air from the aircraft environment into the aircraft cabin corresponds to at least a predetermined minimum value and the differential pressure between the cabin pressure and the ambient pressure does not fall below a second calculated threshold value.

A system for emergency ventilating and pressurizing an aircraft cabin, comprising:

• a device for determining a cabin pressure prevailing within the aircraft cabin,
• a device for determining an ambient pressure prevailing in an aircraft environment, and
• an electrical control device, the control device being adapted to:
• initiate descent of the aircraft, when the cabin pressure falls below a predetermined threshold value,
• initiate a supply of ambient air from the aircraft environment into the aircraft cabin, when, during descent of the aircraft, a differential pressure between the cabin pressure and the ambient pressure falls below a first calculated threshold value, and
• control the supply of ambient air from the aircraft environment into the aircraft cabin and an operation of an air outflow valve of a cabin pressurization system of the aircraft such that a flow of ambient air from the aircraft environment into the aircraft cabin corresponds to at least a predetermined minimum value and the differential pressure between the cabin pressure and the ambient pressure does not fall below a second calculated threshold value, further comprising at least one of:
• a device for determining a number of passengers present within the aircraft cabin,
• a device for determining an ambient temperature, and
• a device for determining a cabin temperature,
• wherein the control device is adapted to determine a constant cruising altitude of the aircraft and the second calculated threshold value of the differential pressure between the cabin pressure and the ambient pressure, which is maintained while the aircraft is cruising at the constant cruising altitude, in dependence on at least one of the number of passengers present within the aircraft cabin, the ambient temperature, and the cabin temperature.