×

Robustness and availability of aircraft acceleration evaluation

  • US 10,293,923 B2
  • Filed: 10/06/2015
  • Issued: 05/21/2019
  • Est. Priority Date: 10/06/2015
  • Status: Active Grant
First Claim
Patent Images

1. A system for determining an accepted deceleration rate of an aircraft comprising:

  • an avionics unit capable of transmitting an avionics deceleration rate, the avionics unit having an avionics monitor circuit configured to transmit avionics operational data that indicates the avionics deceleration rate is either valid or invalid;

    at least two wheel speed sensors configured to output wheel speed data including a wheel speed of a corresponding wheel;

    a brake control unit comprising;

    a first brake control unit card having a first accelerometer configured to detect a first accelerometer deceleration rate and having a first brake controller configured to transmit first accelerometer operational data that indicates the first accelerometer deceleration rate is either valid or invalid; and

    a second brake control unit card having a second accelerometer configured to detect a second accelerometer deceleration rate and a second brake controller configured to transmit second accelerometer operational data that indicates the second accelerometer deceleration rate is ether valid or invalid,wherein the brake control unit is in operable communication with the avionics unit and the at least two wheel speed sensors, the brake control unit configured to;

    determine a wheel speed deceleration rate based on the wheel speed data; and

    determine the accepted deceleration rate of the aircraft to be used by the brake control unit according to one of the following options A through G;

    A) if the avionics deceleration rate is valid, the first accelerometer deceleration rate is invalid, and the second accelerometer deceleration rate is invalid, then the accepted deceleration rate is the avionics deceleration rate;

    B) if the avionics deceleration rate is invalid, the first accelerometer deceleration rate is invalid, and the second accelerometer deceleration rate is invalid, then then the accepted deceleration rate is the wheel speed deceleration rate;

    C) if the avionics deceleration rate is invalid, the first accelerometer deceleration rate is valid, and the second accelerometer deceleration rate is invalid, then the accepted deceleration rate is the wheel speed deceleration rate;

    D) if the avionics deceleration rate is invalid, the first accelerometer deceleration rate is invalid, and the second accelerometer deceleration rate is valid, then the accepted deceleration rate is the wheel speed deceleration rate;

    E) if the avionics deceleration rate is valid, the first accelerometer deceleration rate is valid, and the second accelerometer deceleration rate is valid, then;



    determine whether or not the avionics deceleration rate is within a predetermined threshold percentage of both the first accelerometer deceleration rate and the second accelerometer deceleration rate, 

    if so, the accepted deceleration rate is the avionics deceleration rate;



    if not, determine whether or not the avionics deceleration rate is within a predetermined threshold percentage of one of the first accelerometer deceleration rate and the second accelerometer deceleration rate, 

    if so, determine whether or not the first accelerometer deceleration rate and the second accelerometer deceleration rate are within a predetermined threshold percentage of each other, 

    if so, the accepted deceleration rate is an average between the avionics deceleration rate and the one of the first accelerometer deceleration rate and the second accelerometer deceleration rate that the avionics deceleration rate was within the predetermined threshold percentage of;



    if not, the accepted deceleration rate is the wheel speed deceleration rate;



    if not, determine whether or not the first accelerometer deceleration rate and the second accelerometer deceleration rate are within a predetermined threshold percentage of each other, 

    if so, the accepted deceleration rate is an average between the first accelerometer deceleration rate and the second accelerometer deceleration rate;



    if not, the accepted deceleration rate is the wheel speed deceleration rate;

    F) if the avionics deceleration rate is invalid, the first accelerometer deceleration rate is valid, and the second accelerometer deceleration rate is valid, then;



    determine whether or not the first accelerometer deceleration rate and the second accelerometer deceleration rate are within a predetermined threshold percentage of each other, 

    if so, the accepted deceleration rate is an average between the first accelerometer deceleration rate and the second accelerometer deceleration rate;



    if not, the accepted deceleration rate is the wheel speed deceleration rate;

    G) if the avionics deceleration rate is valid, the first accelerometer deceleration rate is valid, and the second accelerometer deceleration rate is invalid, then;



    determine whether or not the avionics deceleration rate and the first accelerometer deceleration rate are within a predetermined threshold percentage of each other, 

    if so, the accepted deceleration rate is an average between the avionics deceleration rate and the first accelerometer deceleration rate;



    if not, the accepted deceleration rate is the wheel speed deceleration rate;

    H) if the avionics deceleration rate is valid, the first accelerometer deceleration rate is invalid, and the second accelerometer deceleration rate is valid, then;



    determine whether or not the avionics deceleration rate and the second accelerometer deceleration rate are within a predetermined threshold percentage of each other, 

    if so, the accepted deceleration rate is an average between the avionics deceleration rate and the second accelerometer deceleration rate;



    if not, the accepted deceleration rate is the wheel speed deceleration rate.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×