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Anti-lock braking system module for aircraft equipped with master cylinder brake systems

Imported: 24 Feb '17 | Published: 06 Jan '04

Allen R. Gale, Jeffrey K. Arnold, Allan W. Blunt, Leo H. McWilliams

USPTO - Utility Patents

Abstract

A combination brake and anti-lock system for a wheeled vehicle such as an aircraft includes an operator controlled source of pressurized hydraulic fluid for selectively applying hydraulic pressure to a hydraulically actuated wheel rotation braking device which responds to the applied hydraulic pressure to apply a braking force to a wheel of the vehicle to thereby arresting wheel motion. There is a low pressure hydraulic fluid return with a normally open hold valve in circuit between the source and the braking device for selectively opening and closing a fluid flow path from the source to the braking device and a normally closed decay valve in circuit between the braking device and the return for selectively opening and closing a fluid flow path from the braking device to the return. A wheel speed sensing device provides an indication of the rotational speed of the wheel and a valve control responds to an indication of a skid indicative wheel speed irregularity from the sensing device to close the normally open valve and open the normally closed valve. The valve control may be disabled manually by an operator on command or automatically upon detecting an anti-skid malfunction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic illustration of the present invention applied to an aircraft braking system;

FIG. 2 is a view taken along view line

2

2 of FIG. 1,

FIGS. 3

a and

3

b are a hydraulic schematic illustration of the present invention; and

FIG. 4 is a simplified schematic illustration of an electronic control for one wheel of FIGS. 3

a and

3

b.

Claims

1. A combined brake and anti-lock system for a wheeled vehicle comprising:

2. The combined brake and anti-lock system for a wheeled vehicle as set forth in claim 1, wherein the means for disabling comprises an operator actuable control.

3. The combined brake and anti-lock system for a wheeled vehicle as set forth in claim 1, wherein the means for disabling comprises an error sensing circuit for monitoring anti-lock system operation.

4. The combined brake and anti-lock system for a wheeled vehicle as set forth in claim 1, further comprising:

5. The combined brake and anti-lock system for a wheeled vehicle as set forth in claim 4, further comprising a first hydraulic pump between the low pressure fluid return and the operator controlled source of pressurized hydraulic fluid, a second hydraulic pump between the second low pressure fluid return and the second operator controlled source of pressurized hydraulic fluid, and a common motor for simultaneously driving the first and second pumps upon the occurrence of an indication of a skid indicative wheel speed irregularity from the either the first sensing device or the second sensing device.

6. A combined brake and anti-lock system for a wheeled vehicle comprising:

7. The combined brake and anti-lock system for a wheeled vehicle as set forth in claim 6, wherein the means for disabling comprises an operator actuable control.

8. The combined brake and anti-lock system for a wheeled vehicle as set forth in claim 6, wherein the means for disabling comprises an error sensing circuit for monitoring anti-lock system operation.

9. A method of retrofitting an aircraft braking system of the type having two independently operable hydraulic braking circuits, each said braking circuits including a master cylinder for selectively supplying pressurized hydraulic fluid to a corresponding brake actuating mechanism, to incorporate an anti-skid feature, comprising:

10. The method of claim 9, wherein the step of introducing includes the introduction of two further pair of valves, one further pair in parallel with a corresponding said pair in each of the hydraulic circuits, and a pair of pressure actuated shuttle valves each coupling one of each parallel valve pair to the corresponding actuating mechanism.