Single-wheel anti-deflection braking system of main landing gear

Abstract

The invention belongs to the field of undercarriage brake control, and particularly relates to a single-wheel anti-deflection brake system of a main undercarriage. The brake system comprises a brake hydraulic energy source, a differential brake instruction switch, a brake instruction sensor, a brake device, a pressure sensor, a wheel speed sensor, a brake control unit, a brake control valve assembly and a differential brake electromagnetic valve. According to the main landing gear single-wheel anti-deflection braking system, a control framework of the main landing gear single-wheel anti-deflection braking system is designed, the problem that left braking and right braking are inconsistent possibly caused by main landing gear single-wheel braking is solved, and meanwhile the differential braking function can be achieved.

Description

Technical Field

[0001] This application belongs to the field of landing gear brake control, and specifically relates to a main landing gear single-wheel anti-yaw brake system. Background Technology

[0002] The wheel braking system plays a crucial role in the takeoff and landing design of aircraft. For manned aircraft, the braking system is also closely related to human-machine interface, and a well-designed braking control system and braking law directly affect the aircraft's ground handling performance. This is especially true for aircraft with a large main-to-main-wheel track and a small number of main braking wheels, where braking system design is particularly important.

[0003] For aircraft with a large main-to-main wheel distance and only one brake wheel on each main landing gear, the design of the braking system is more challenging, as this type of braking system is prone to problems such as brake sway.

[0004] Therefore, there is an urgent need for a technical solution to overcome or mitigate at least one of the aforementioned defects in the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide a main landing gear single-wheel anti-yaw braking system to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] A main landing gear single-wheel anti-yaw braking system includes:

[0008] Differential brake command switch, used to issue differential brake command;

[0009] Brake command sensors, including a left brake command sensor and a right brake command sensor, are used to collect left brake commands and right brake commands, respectively.

[0010] The braking system includes a left wheel brake and a right wheel brake. The left wheel brake is connected to a left brake hydraulic power source via a left brake hydraulic circuit, and is used to convert the hydraulic pressure of the left brake hydraulic circuit into braking torque acting on the left brake disc to brake the left wheel. The right wheel brake is connected to a right brake hydraulic power source via a right brake hydraulic circuit, and is used to convert the hydraulic pressure of the right brake hydraulic circuit into braking torque acting on the right brake disc to brake the right wheel.

[0011] Pressure sensors include a left brake pressure sensor and a right brake pressure sensor; the left brake pressure sensor is installed in the left brake hydraulic circuit to collect the left brake pressure signal; the right brake pressure sensor is installed in the right brake hydraulic circuit to collect the right brake pressure signal.

[0012] Wheel speed sensors include a left wheel speed sensor mounted on the left engine wheel axle and a right wheel speed sensor mounted on the right engine wheel axle, which are used to collect the speed of the left engine wheel and the speed of the right engine wheel, respectively;

[0013] The brake control unit is used to generate left brake control commands based on left brake commands, left brake pressure signals, and left wheel speed; generate right brake control commands based on right brake commands, right brake pressure signals, and right wheel speed; and generate differential brake control commands based on differential brake commands.

[0014] The brake control valve assembly includes a left brake control valve assembly and a right brake control valve assembly; the left brake control valve assembly is disposed on the left brake hydraulic circuit and is used to control the hydraulic pressure of the left brake hydraulic circuit according to the left brake control command; the right brake control valve assembly is disposed on the right brake hydraulic circuit and is used to control the hydraulic pressure of the right brake hydraulic circuit according to the right brake control command.

[0015] The differential brake solenoid valve is installed in the left brake hydraulic circuit and the right brake hydraulic circuit, and is located downstream of the brake control valve assembly. It is used to control the on / off state of the left brake hydraulic circuit and the right brake hydraulic circuit according to the differential brake control command.

[0016] Preferably, the differential brake command switch includes a two-position manual control switch.

[0017] Preferably, the differential brake command switch is in the off position by default.

[0018] Preferably, the differential brake command switch is interconnected with the brake control unit via electrical signals.

[0019] Preferably, the brake control unit includes a first brake control module and a second brake control module, which are used to implement dual-redundant control.

[0020] Preferably, the first brake control module and the second brake control module take turns according to a preset rule, and when one of the brake control modules fails, it automatically switches to the other brake control module.

[0021] Preferably, the left brake control valve assembly includes a left brake cut-off valve and a left brake servo valve, with the left brake servo valve located downstream of the left brake cut-off valve;

[0022] The right brake control valve assembly includes a right brake cut-off valve and a right brake servo valve, with the right brake servo valve located downstream of the right brake cut-off valve.

[0023] Preferably, the left brake pressure sensor is located downstream of the left brake servo valve, and the right brake pressure sensor is located downstream of the right brake servo valve.

[0024] Preferably, the outputs of the left brake servo valve and the right brake servo valve are connected via a hydraulic circuit, and the differential brake solenoid valve is located on this hydraulic circuit.

[0025] Preferably, when either brake control valve assembly fails, the differential brake solenoid valve is set to the ON state.

[0026] Preferably, the differential brake solenoid valve is connected to the brake control unit via electrical wiring.

[0027] Preferably, the main landing gear single-wheel anti-yaw braking system has a first control mode, in which:

[0028] The differential brake solenoid valve is shut off according to the differential brake control command;

[0029] The left brake control valve assembly controls the left wheel brake according to the left brake control command; the right brake control valve assembly controls the right wheel brake according to the right brake control command.

[0030] Preferably, the main landing gear single-wheel anti-yaw braking system has a second control mode, in which:

[0031] The differential brake solenoid valve opens according to the differential brake control command;

[0032] The left brake control valve assembly controls the left and right wheel brakes according to the left brake control command; or, the right brake control valve assembly controls the left and right wheel brakes according to the right brake control command.

[0033] The invention has at least the following beneficial technical effects:

[0034] The main landing gear single-wheel anti-yaw braking system of this application designs a control architecture for the main landing gear single-wheel anti-yaw braking system, which solves the problem of inconsistent braking between the left and right sides that may be caused by the main landing gear single-wheel braking, and can also realize differential braking function. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a main landing gear single-wheel anti-sway braking system according to one embodiment of this application.

[0036] in:

[0037] 1-Differential command switch; 2.1-Left brake command; 2.2-Right brake command; 3.1-Left brake control valve assembly; 3.1.1-Left brake cut-off valve; 3.1.2-Left brake servo valve; 3.2-Right brake control valve assembly; 3.2.1-Right brake cut-off valve; 3.2.2-Right brake servo valve; 4.1-Left brake pressure sensor; 4.2-Right brake pressure sensor; 5-Differential brake solenoid valve; 6.1-Left brake device; 6.2-Right brake device; 7-Brake control unit; 7.1-First brake control module; 7.2-Second brake control module; 8.1-Left brake hydraulic power source; 8.2-Right brake hydraulic power source; 9.1-Left brake wheel speed sensor; 9.2-Right brake wheel speed sensor. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0039] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0040] This application provides a main landing gear single-wheel anti-yaw braking system, including: a differential brake command switch 1, a brake command sensor, a brake device, a pressure sensor, a wheel speed sensor, a brake control unit 7, a brake control valve assembly, and a differential brake solenoid valve 5.

[0041] Specifically, such as Figure 1 As shown, the differential brake command switch 1 is used to issue a differential brake command and report the differential brake command to the brake control unit 7. This command is used to control whether the differential brake solenoid valve 5 is opened, thereby realizing the differential brake function. In a preferred embodiment of this application, the differential brake command switch 1 includes a two-position manual control switch, which is in the off position by default. When differential braking is required, the switch is manually turned to the differential brake position. The differential brake command switch 1 and the brake control unit 7 are interconnected via electrical signals.

[0042] The brake command sensors include a left brake command sensor 2.1 and a right brake command sensor 2.2, which are used to sense the operator's left brake command and right brake command, respectively, and convert the left brake command and right brake command into electrical signals and report them to the brake control unit 7.

[0043] The braking system includes a left wheel brake 6.1 and a right wheel brake 6.2. The left wheel brake 6.1 is connected to a left brake hydraulic power source 8.1 via a left brake hydraulic circuit, converting the hydraulic pressure of the left brake hydraulic circuit into braking torque acting on the left brake disc to brake the left wheel. The right wheel brake 6.2 is connected to a right brake hydraulic power source 8.2 via a right brake hydraulic circuit, converting the hydraulic pressure of the right brake hydraulic circuit into braking torque acting on the right brake disc to brake the right wheel. Both the left and right brake hydraulic power sources 8.1 and 8.2 provide hydraulic power to the braking system.

[0044] The pressure sensors include a left brake pressure sensor 4.1 and a right brake pressure sensor 4.2, which can sense the magnitude of brake pressure. The left brake pressure sensor 4.1 is installed on the left brake hydraulic circuit to collect the left brake pressure signal; the right brake pressure sensor 4.2 is installed on the right brake hydraulic circuit to collect the right brake pressure signal. The left brake pressure signal and the right brake pressure signal are reported to the brake control unit 7 for feedback control.

[0045] The wheel speed sensors include a left wheel speed sensor 9.1 mounted on the left engine wheel axle and a right wheel speed sensor 9.2 mounted on the right engine wheel axle, which are used to collect the speed of the left engine wheel and the speed of the right engine wheel, respectively, and report them to the brake control unit 7 for feedback control.

[0046] The brake control unit 7 is used to generate left brake control commands based on left brake commands, left brake pressure signals, and left wheel speed; to generate right brake control commands based on right brake commands, right brake pressure signals, and right wheel speed; and to generate differential brake control commands based on differential brake commands. The brake control unit 7 includes a first brake control module 7.1 and a second brake control module 7.2. Both the first brake control module 7.1 and the second brake control module 7.2 can control the left brake control valve assembly 3.1 and the right brake control valve assembly 3.2 to achieve dual-redundancy control. The two brake control modules can achieve complete redundancy switching. The first brake control module 7.1 and the second brake control module 7.2 take turns according to a preset rule. When one brake control module fails, it automatically switches to the other brake control module. Both brake control modules include a brake control law to acquire and process signals from the brake command sensor, differential brake command switch 1, brake pressure sensor, and wheel speed sensor. The two brake control modules can drive the brake control valve assembly and differential brake solenoid valve 5 according to the corresponding control commands. Based on the received brake commands, pressure, wheel speed, and other signals, the brake control law outputs the corresponding valve current to control the pressure output of the shut-off valve and servo valve, thereby realizing the brake pressure regulation function.

[0047] The brake control valve assembly includes a left brake control valve assembly 3.1 and a right brake control valve assembly 3.2. The left brake control valve assembly 3.1 is located on the left brake hydraulic circuit and is used to control the hydraulic pressure of the left brake hydraulic circuit according to the left brake control command. The right brake control valve assembly 3.2 is located on the right brake hydraulic circuit and is used to control the hydraulic pressure of the right brake hydraulic circuit according to the right brake control command. The brake control valve assembly can output a corresponding hydraulic pressure value based on the valve current signal sent by the brake control unit 7. Specifically, the left brake control valve assembly 3.1 includes a left brake cut-off valve 3.1.1 and a left brake servo valve 3.1.2, with the servo valve 3.1.2 located downstream of the left brake cut-off valve 3.1.1; the right brake control valve assembly 3.2 includes a right brake cut-off valve 3.2.1 and a right brake servo valve 3.2.2, with the servo valve 3.2.2 located downstream of the right brake cut-off valve 3.2.1. The main function of the servo valve is to adjust the valve opening according to the magnitude of the valve current output by the brake control unit 7, thereby outputting the corresponding hydraulic pressure. The left brake pressure sensor 4.1 is located downstream of the left brake servo valve 3.1.2, and the right brake pressure sensor 4.2 is located downstream of the right brake servo valve 3.2.2.

[0048] The differential brake solenoid valve 5 is installed in both the left and right brake hydraulic circuits, downstream of the brake control valve assembly. It controls the on / off state of the left and right brake hydraulic circuits according to differential brake control commands. The outputs of the left brake servo valve 3.1.2 and the right brake servo valve 3.2.2 are connected via hydraulic circuits, and the differential brake solenoid valve 5 is located on these hydraulic circuits. When either brake control valve assembly malfunctions, the differential brake solenoid valve 5 is activated, connecting the left and right brake hydraulic circuits. This allows for unified control of both brakes via either brake control valve assembly. The differential brake solenoid valve 5 is electrically connected to the brake control unit 7.

[0049] The main landing gear single-wheel anti-yaw braking system of this application has a first control mode, in which:

[0050] The differential brake solenoid valve 5 is shut off according to the differential brake control command;

[0051] The left brake control valve assembly 3.1 controls the left wheel brake according to the left brake control command; the right brake control valve assembly 3.2 controls the right wheel brake according to the right brake control command.

[0052] In the first control mode, when the brake control unit 7 receives a differential brake command from the differential brake command switch 1, it outputs a shut-off command for the differential brake solenoid valve 5. At this time, the braking system controls the left brake with the left brake control valve assembly 3.1 and the right brake with the right brake control valve assembly 3.2, and differential braking function can be realized according to the different left and right brake commands. In one embodiment of this application, when the differential command switch 1 is closed, the brake control unit 7 integrates the command values ​​of the left and right brake command sensors and outputs brake control commands to the left brake control valve assembly 3.1 or the right brake control valve assembly 3.2 in turn, realizing the braking of the left and right main brakes using a single-sided brake control valve. When designing the brake control law in the brake control unit 7, the pressure feedback information of the left brake pressure sensor 4.1 and the right brake pressure sensor 4.2, as well as the wheel speed feedback information of the left wheel speed sensor 9.1 and the right wheel speed sensor 9.2 are integrated.

[0053] The main landing gear single-wheel anti-yaw braking system of this application has a second control mode, in which:

[0054] The differential brake solenoid valve 5 opens according to the differential brake control command;

[0055] The left brake control valve assembly 3.1 controls the left wheel brake and the right wheel brake according to the left brake control command; or, the right brake control valve assembly 3.2 controls the left wheel brake and the right wheel brake according to the right brake control command.

[0056] In the second control mode, when the differential brake solenoid valve 5 is opened, the two brake servo valves are connected, and the left and right brakes can be controlled through either servo valve. The two servo valves form a redundancy design, which improves the reliability of the single-wheel braking system.

[0057] During normal braking when the aircraft is malfunctioning in either brake control valve assembly, the differential brake command switch 1 can be turned on, allowing both brake control modules and both brake control valve assemblies to work simultaneously to control the left and right brakes, thus achieving normal braking function for the aircraft.

[0058] The main landing gear single-wheel anti-yaw braking system of this application can realize both the redundancy control of the braking system and the differential braking function.

[0059] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A main landing gear single wheel anti- yaw brake system, characterized in that, The application relates to a differential brake system, comprising: a differential brake instruction switch (1) for sending a differential brake instruction; brake instruction sensors, including a left brake instruction sensor (2.1) and a right brake instruction sensor (2.2) for collecting left brake instructions and right brake instructions respectively; brake devices, including a left machine wheel brake device (6.1) and a right machine wheel brake device (6.2); the left machine wheel brake device (6.1) is connected with a left brake hydraulic oil path and a left brake hydraulic energy source (8.1) and is used for converting the hydraulic pressure of the left brake hydraulic oil path into brake torque to act on a left brake disc for left machine wheel braking; the right machine wheel brake device (6.2) is connected with a right brake hydraulic oil path and a right brake hydraulic energy source (8.2) and is used for converting the hydraulic pressure of the right brake hydraulic oil path into brake torque to act on a right brake disc for right machine wheel braking; pressure sensors, including a left brake pressure sensor (4.1) and a right brake pressure sensor (4.2); the left brake pressure sensor (4.1) is arranged on the left brake hydraulic oil path and is used for collecting a left brake pressure signal; the right brake pressure sensor (4.2) is arranged on the right brake hydraulic oil path and is used for collecting a right brake pressure signal; wheel speed sensors, including a left wheel speed sensor (9.1) arranged on a left machine wheel axle and a right wheel speed sensor (9.2) arranged on a right machine wheel axle and used for collecting left machine wheel speed and right machine wheel speed respectively; a brake control unit (7) for generating a left brake control instruction according to the left brake instruction, the left brake pressure signal and the left machine wheel speed, generating a right brake control instruction according to the right brake instruction, the right brake pressure signal and the right machine wheel speed and generating a differential brake control instruction according to the differential brake instruction; brake control valve assemblies, including a left brake control valve assembly (3.1) and a right brake control valve assembly (3.2); the left brake control valve assembly (3.1) is arranged on the left brake hydraulic oil path and is used for controlling the hydraulic pressure of the left brake hydraulic oil path according to the left brake control instruction; the right brake control valve assembly (3.2) is arranged on the right brake hydraulic oil path and is used for controlling the hydraulic pressure of the right brake hydraulic oil path according to the right brake control instruction; a differential brake electromagnetic valve (5) arranged on the left brake hydraulic oil path and the right brake hydraulic oil path and located downstream of the brake control valve assemblies and used for controlling the opening and closing of the left brake hydraulic oil path and the right brake hydraulic oil path according to the differential brake control instruction.

2. The main landing gear single wheel anti-derailment brake system according to claim 1, characterized in that, The differential brake instruction switch (1) comprises two-position manual control switches.

3. The main landing gear single wheel anti-derailment brake system according to claim 2, characterized in that, The differential brake instruction switch (1) is in the default off position.

4. The main landing gear single wheel anti-derailment brake system according to claim 3, characterized in that, The differential brake instruction switch (1) and the brake control unit (7) are interconnected through electrical signals.

5. The main landing gear single wheel anti-derailment brake system according to claim 1, characterized in that, The brake control unit (7) comprises a first brake control module (7.1) and a second brake control module (7.2) for realizing double-redundancy control.

6. The main landing gear single wheel anti-derailment brake system according to claim 5, characterized in that, The first brake control module (7.1) and the second brake control module (7.2) are on duty according to a preset rule and automatically switch to the other brake control module when one of the brake control modules fails.

7. The main landing gear single wheel anti-derailment brake system according to claim 1, characterized in that, The left brake control valve assembly (3.1) comprises a left brake cut valve (3.1.1) and a left brake servo valve (3.1.2), and the left brake servo valve (3.1.2) is located downstream of the left brake cut valve (3.1.1); The right brake control valve assembly (3.2) comprises a right brake cut valve (3.2.1) and a right brake servo valve (3.2.2), and the right brake servo valve (3.2.2) is located downstream of the right brake cut valve (3.2.1). The left brake pressure sensor (4.1) is located downstream of the left brake servo valve (3.1.2), and the right brake pressure sensor (4.2) is located downstream of the right brake servo valve (3.2.2).

8. The main landing gear single wheel anti-derailment brake system according to claim 7, characterized in that, The output ends of the left brake servo valve (3.1.2) and the right brake servo valve (3.2.2) are connected through a hydraulic oil path, and the differential brake solenoid valve (5) is arranged on the hydraulic oil path. When any side brake control valve assembly fails, the differential brake solenoid valve (5) is set to an on state.

9. The main landing gear single wheel anti-derailment brake system according to claim 8, characterized in that, The differential brake solenoid valve (5) is connected to the brake control unit (7) through an electrical line.

10. The main landing gear single wheel anti-derailment brake system according to claim 9, characterized in that, The main landing gear single-wheel anti-yaw brake system has a first control mode, in which:

11. The main landing gear single wheel anti-derailment brake system according to claim 10, characterized in that, The differential brake solenoid valve (5) is closed according to the differential brake control command; 12. The main landing gear single wheel anti-derailment brake system according to claim 11, characterized in that, The left brake control valve assembly (3.1) controls the left machine wheel brake according to the left brake control command; and the right brake control valve assembly (3.2) controls the right machine wheel brake according to the right brake control command. The main landing gear single-wheel anti-yaw brake system has a second control mode, in which: The differential brake solenoid valve (5) is opened according to the differential brake control command; 13. The main landing gear single wheel anti-derailment brake system according to claim 12, characterized in that, The left brake control valve assembly (3.1) controls the left machine wheel brake and the right machine wheel brake according to the left brake control command; or, the right brake control valve assembly (3.2) controls the left machine wheel brake and the right machine wheel brake according to the right brake control command. ​ ​

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