Brake function based on controlling according to acceleration

• US 7,941,261 B2
• Filed: 04/15/2005
• Issued: 05/10/2011
• Est. Priority Date: 04/15/2004
• Status: Active Grant

• Current Assignee: Oddvard Johnsen
• Original Assignee: Oddvard Johnsen
• Inventors: Johnsen, Oddvard
• Primary Examiner(s): Tran; Khoi
• Assistant Examiner(s): Figueroa; Jaime
• Application Number:
  US10/599,783
• Publication Number:
  US 20070203633A1
• Time in Patent Office: 2,216 Days
• Field of Search: 701/78, 701/79, 701/70, 701/71, 701/82, 701/83, 303/125, 303/126
• US Class Current: 701/70
• CPC Class Codes: B60T 8/1703 for aircrafts
• CPC Class Codes: B64C 25/426 Braking devices providing an automatic sequence of braking

Abstract

A brake controller function to optimally brake a wheel of a vehicle in motion, such as an aircraft. The brake pressure control self regulates by means of applying brake pressure in accordance with vehicle acceleration information and the change in acceleration over time in the horizontal plane. Vehicle acceleration and information about its change enable a brake pressure control function to determine the brake pressure associated with maximum obtainable retardation for a vehicle at that given point in time. By continuously monitoring acceleration change and detecting retardation pinnacles, the culmination and turning points of retardation, with their associated brake pressure, maximum braking ability is assured at any given time. By applying acceleration data in real time as a controls reference in a brake logic control function to increase or reduce brake pressure, such a brake control function will assure a brake pressure perfectly fit with net of all the forces that a vehicle is subjected to. It will ensure optimal brake level with respect the vehicle tire/pavement surface interface.

Claims

1. A brake control system, comprising:

an accelerometer configured to measure a linear deceleration of a vehicle body and output a measured deceleration signal;

a brake pressure sensor configured to output a brake pressure signal; and

a brake controller configured to;

receive the measured deceleration signal from the accelerometer and calculate a change in linear deceleration over time;

receive the brake pressure signal and calculate a change in an applied brake pressure; and

calculate a brake pressure adjustment signal using the calculated change in linear deceleration over time and the calculated change in applied brake pressure.

4. The system of claim 1, wherein the vehicle body is an aircraft.

5. The system of claim 1, further comprising an automatic brake configured to receive the brake pressure adjustment signal.

6. The system of claim 1, further comprising a manual brake configured to receive the brake pressure adjustment signal.

10. The system of claim 1, wherein the change in linear deceleration over time is calculated as a vector equal to a hypotenuse in a right-angle triangle where longitudinal and lateral deceleration are equal to sides adjacent to the right-angle of the triangle.

11. The system of claim 1, wherein the change in linear deceleration over time comprises longitudinal deceleration, lateral deceleration, vertical deceleration, or a combination thereof.

12. The system of claim 1, wherein the brake controller is further adapted to determine a maximum braking capability of the vehicle body using the change in linear deceleration of the vehicle body.

13. The system of claim 1, wherein the vehicle deceleration signal comprises at least one of longitudinal, lateral, and vertical deceleration data.

14. The system of claim 1, wherein the brake controller is further adapted to output deceleration data to a data storage file or a display.

2. A method for controlling a braking operation, comprising:

applying brake pressure to a wheel of a vehicle body;

measuring a linear deceleration of the vehicle body;

increasing the brake pressure to the wheel after the brake pressure has been applied, wherein the brake pressure to the wheel is increased from a first time frame to a second time frame;

calculating a change in linear deceleration of the vehicle body from the first time frame to the second time frame;

calculating a change in the brake pressure applied to the wheel from the first time frame to the second time frame; and

reducing the brake pressure applied to the wheel when the calculated change in linear deceleration becomes negative and the calculated change in brake pressure applied to the wheel is greater than or equal to zero.

3. The method of claim 2, wherein the change in linear deceleration is calculated as a vector equal to a hypotenuse in a right-angle triangle where longitudinal and lateral deceleration are equal to sides adjacent to the right-angle of the triangle.

7. The method of claim 2, wherein the vehicle body is an aircraft.

8. The method of claim 2, wherein the brake pressure is applied with an automatic brake.

9. The method of claim 2, wherein the brake pressure is applied with a manual brake.

15. The method of claim 2, wherein the change in linear deceleration over time comprises longitudinal deceleration, lateral deceleration, vertical deceleration, or a combination thereof.

17. The method of claim 2, wherein brake pressure applied to the wheel is reduced by a predetermined pressure increment.

18. The method of claim 2, wherein the linear deceleration of the vehicle body represents information about optimal braking capability of the vehicle body when the calculated change in linear deceleration becomes negative and the calculated change in brake pressure applied to the wheel is greater than or equal to zero.

19. The method of claim 2, wherein the brake pressure applied to the wheel is reduced when velocity of the vehicle body is greater than zero.

20. The method of claim 2, wherein the brake pressure applied to the wheel is increased incrementally.

16. A method for controlling a braking operation of a vehicle body, comprising:

applying brake pressure to a wheel of the vehicle body;

increasing the brake pressure to the wheel for a length of time;

calculating a change in linear deceleration of the vehicle body over the length of time;

determining a maximum braking capability of the vehicle body using the calculated change in linear deceleration of the vehicle body over the length of time; and

varying the brake pressure applied to the wheel based on the determined maximum braking capability of the vehicle body.