Stopping energy based selection logic for taxi brake release

Patent metadata

Field	Value
Publication number	US-9914442-B2
Application number	US-201313972645-A
Country	US
Kind code	B2
Filing date	Aug 21, 2013
Priority date	Aug 21, 2013
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

The present disclosure provides a system, method, and apparatus for distributing energy amongst at least one forward brake and at least one aft brake for a vehicle. The method involves determining, with at least one processor, an energy for at least one first brake and an energy for at least one second brake. Further, the method involves comparing, with at least one processor, the energy for at least one first brake with the energy for at least one second brake. Also, releasing at least one first brake, when at least one processor determines the energy of at least one first brake is greater than the energy for at least one second brake. Further, releasing at least one second brake, when at least one processor determines the energy of at least one second brake is greater than the energy for at least one first brake.

First claim

We claim:

1. A method for distributing energy amongst at least one first brake and at least one second brake for a vehicle, the method comprising:
subtracting, with at least one processor, a previous number of revolutions of at least one first wheel, which were counted during a previous clock cycle, from a current number of revolutions of the at least one first wheel, which were counted during a current clock cycle, to obtain a difference in the number revolutions for the at least one first wheel;
multiplying, with the at least one processor, force applied to the at least one first brake to the difference in the number of revolutions for the at least one first wheel to obtain brake energy absorbed by the at least one first brake;
subtracting, with the at least one processor, a previous number of revolutions of at least one second wheel, which were counted during the previous clock cycle, from a current number of revolutions of the at least one second wheel, which were counted during the current clock cycle, to obtain a difference in the number revolutions for the at least one second wheel;
multiplying, with the at least one processor, force applied to the at least one second brake to the difference in the number of revolutions for the at least one second wheel to obtain brake energy absorbed by the at least one second brake;
comparing, with the at least one processor, the brake energy absorbed by the at least one first brake with the brake energy absorbed by the at least one second brake;
releasing, by a switch, the at least one first brake, when the at least one processor determines the brake energy absorbed by the at least one first brake is greater than the brake energy absorbed by the at least one second brake to allow the at least one first brake to cool; and
releasing, by the switch, the at least one second brake, when the at least one processor determines the brake energy absorbed by the at least one second brake is greater than the brake energy absorbed by the at least one first brake to allow the at least one second brake to cool.

2. The method of claim 1 , wherein the at least one first brake is at least one forward brake, and wherein the at least one second brake is at least one aft brake.

3. The method of claim 1 , wherein the method further comprises counting, with at least one first sensor, during the current clock cycle, the current number of revolutions of the at least one first wheel; and
counting, with at least one second sensor, during the current clock cycle, the current number of revolutions of the at least one second wheel.

4. A method for distributing energy amongst at least one forward brake and at least one aft brake for a vehicle, the method comprising:
subtracting, with at least one processor, a previous number of revolutions of at least one forward wheel, which were counted during a previous clock cycle, from a current number of revolutions of the at least one forward wheel, which were counted during a current clock cycle, to obtain a difference in the number revolutions for the at least one forward wheel;
multiplying, with the at least one processor, force applied to the at least one forward brake to the difference in the number of revolutions for the at least one forward wheel to obtain brake energy absorbed by the at least one forward brake;
subtracting, with the at least one processor, a previous number of revolutions of at least one aft wheel, which were counted during the previous clock cycle, from a current number of revolutions of the at least one aft wheel, which were counted during the current clock cycle, to obtain a difference in the number revolutions for the at least one aft wheel;
multiplying, with the at least one processor, force applied to the at least one aft brake to the difference in the number of revolutions for the at least one aft wheel to obtain brake energy absorbed by the at least one aft brake;
subtracting, with at least one processor, the brake energy absorbed by the at least one aft brake from the brake energy absorbed by the at least one forward brake to obtain a difference in brake energy;
determining, with the at least one processor, whether the difference in brake energy is greater than zero;
releasing, by a switch, the at least one forward brake, when the difference in brake energy is greater than zero to allow the at least one forward brake to cool; and
releasing, by the switch, the at least one aft brake, when the difference in brake energy is one of less than zero and equal to zero to allow the at least one aft brake to cool.

5. The method of claim 4 , wherein the method further comprises counting, with at least one forward sensor, during the current clock cycle, the current number of revolutions of the at least one forward wheel; and
counting, with at least one aft sensor, during the current clock cycle, the current number of revolutions of the at least one aft wheel.

6. The method of claim 4 , wherein the method further comprises, prior to the determining of whether the difference in brake energy is greater than zero, adding, with the at least one processor, a remaining amount of brake energy to the difference in brake energy.

7. The method of claim 6 , wherein the method further comprises multiplying, with the at least one processor, a previous difference in brake energy with a brake cooling factor to obtain the remaining amount of brake energy.

8. The method of claim 7 , wherein the brake cooling factor is related to at least one of a material of the at least one forward brake, a material of the at least one aft brake, an ambient temperature affect, a loading of the vehicle, road conditions, and weather conditions.

9. A system for distributing energy amongst at least one forward brake and at least one aft brake for a vehicle, the system comprising:
the at least one forward brake;
the at least one aft brake; and
at least one processor configured (1) to subtract a previous number of revolutions of at least one forward wheel, which were counted during a previous clock cycle, from a current number of revolutions of the at least one forward wheel, which were counted during a current clock cycle, to obtain a difference in the number revolutions for the at least one forward wheel, (3) to multiply force applied to the at least one forward brake to the difference in the number of revolutions for the at least one forward wheel to obtain brake energy absorbed by the at least one forward brake, (4) to subtract a previous number of revolutions of at least one aft wheel, which were counted during the previous clock cycle, from a current number of revolutions of the at least one aft wheel, which were counted during the current clock cycle, to obtain a difference in the number revolutions for the at least one aft wheel, (5) to multiply force applied to the at least one aft brake to the difference in the number of revolutions for the at least one aft wheel to obtain brake energy absorbed by the at least one aft brake, (6) to subtract the brake energy absorbed by the at least one aft brake from the brake energy absorbed by the at least one forward brake to obtain a difference in brake energy, and (7) to determine whether the difference in brake energy is greater than zero,
wherein when the difference in brake energy is greater than zero, at least one forward brake is released, by a switch, to allow the at least one forward brake to cool, and
wherein when the difference in brake energy is one of less than zero and equal to zero, at least one aft brake is released, by the switch, to allow the at least one aft brake to cool.

10. The system of claim 9 , wherein the vehicle is an airborne vehicle.

11. The system of claim 10 , wherein th

Assignees

• Boeing Co

Inventors

• Kanemori Scott Brandon
• Yamamoto David T

Classifications

• B60T13/662 Primary

  characterised by specified functions of the control system components · CPC title

• B60T8/1703 Primary

  for aircrafts · CPC title