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Aircraft aircrew life support systems

  • US 5,314,402 A
  • Filed: 06/11/1991
  • Issued: 05/24/1994
  • Est. Priority Date: 06/19/1990
  • Status: Expired due to Term
First Claim
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1. A method of controlling inflation pressure of an aircrew G-suit in protecting an aircrew member against G-load and against exposure to altitude above a predetermined level, comprising the steps of:

  • storing in an aircraft on-board systems computer a schedule of G-suit inflation pressure against increasing acceleration along a vertical axis of the aircraft and a schedule of G-suit inflation pressure against decreasing cabin ambient pressure;

    inputting to the computer signals representative of acceleration sensed along the vertical axis of the aircraft and signals representative of cabin ambient pressure;

    looking up in the schedules and presenting requirements for G-suit inflation pressure;

    determining by control logic programmed in the computer a higher one of values for G-suit inflation pressure in the vent of simultaneous acceleration and cabin ambient pressure signal inputs requiring inflation of the G-suit;

    generating in the computer a G-suit inflation pressure demand signal;

    transmitting the G-suit inflation pressure demand signal to an electronic control unit dedicated to control of G-suit inflation pressure;

    sensing pressure existing in the G-suit or a pressure substantially corresponding thereto;

    feeding back to the electronic control unit a signal representative of existing G-suit pressure;

    comparing the existing G-suit pressure signal with the G-suit inflation pressure demand signal;

    generating a compensated error signal;

    combining the compensated error signal with the G-suit inflation pressure demand signal to provide a servo-demand signal;

    transmitting the servo-demand signal to servo-control valve means for regulation of a servo-pressure which acts to close G-suit vent valve means adapted when open for communicating the interior of the G-suit with ambient and to open G-suit inflation gas supply valve means adapted for controlling delivery of inflation gas to the interior of the G-suit whereby the G-suit is inflated to a required pressure.

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