Airborne electric hydraulic braking system and method

Abstract

The invention discloses an onboard electric hydraulic braking system and method. The normal electric brake driver is connected with a piston A of the hydraulic brake driver, the piston A divides the hydraulic brake driver into an air cavity A and a hydraulic oil cavity A, the hydraulic oil cavity A is connected with the differential brake actuator, and the differential brake actuator is connected with the left brake actuator and the right brake actuator. Pistons F and pistons G of the left brake actuator and the right brake actuator are correspondingly connected with the movable brake pads A and B; the left brake actuator is divided into a hydraulic oil cavity E and an air cavity E through a piston F, and the right brake actuator is divided into a hydraulic oil cavity F and an air cavity F through a piston G; the interior of the differential brake actuator is divided into a left cavity and a right cavity through a piston D; the left cavity is divided into an air cavity C and a hydraulic oil cavity C through a piston C, and the right cavity is divided into an air cavity D and a hydraulic oil cavity D through a piston E; the air cavity C and the air cavity D are close to a piston D, and the piston D is driven by a differential brake electric actuator; the hydraulic oil cavity A is respectively communicated with the hydraulic oil cavities C and D; and the hydraulic oil cavities C and D are respectively communicated with the hydraulic oil cavities E and F. The device has the characteristics of simple structure, high reliability and high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft brake system design, and in particular to an airborne electric hydraulic brake system and method. Background Art

[0002] At present, the onboard braking system is a pure hydraulic or pure electric braking system. Conventional aircraft are equipped with hydraulic systems. Using hydraulic systems as the braking power source can effectively deal with various problems that occur during the braking process. However, electric brakes will have the problem of insufficient braking force. The reason is mainly due to the inaccurate control of the braking force when the motor feedback force is large. The sudden change in the braking force will cause the aircraft to run off the runway during taxiing, posing a safety hazard to the flight. Now light drones are gradually promoting all-electric aircraft. The original hydraulic brakes on the aircraft have been replaced by electric brakes. However, during the test flight, the problem of uneven braking force often occurs, which brings great inconvenience to the test flight process. Summary of the invention

[0003] The object of the present invention is to provide an airborne electric hydraulic brake system and method. The present invention has the characteristics of simple structure, high reliability and high safety.

[0004] Technical solution. An airborne electric hydraulic brake system includes a normal electric brake driver, which is connected to the piston A of the hydraulic brake driver. The piston A separates the hydraulic brake driver into an air chamber A and a hydraulic oil chamber A. The hydraulic oil chamber A is connected to a differential brake actuator. The differential brake actuator is connected to a left brake actuator and a right brake actuator respectively. The pistons F and G of the left and right brake actuators are connected to the movable brake pads A and B respectively. The left brake actuator is separated into a hydraulic oil chamber E and an air chamber by the piston F. E, the right brake actuator is connected and divided into a hydraulic oil chamber F and an air chamber F by piston G; the differential brake actuator is divided into a left chamber and a right chamber by piston D; the left chamber is divided into an air chamber C and a hydraulic oil chamber C by piston C, and the right chamber is divided into an air chamber D and a hydraulic oil chamber D by piston E; both the air chamber C and the air chamber D are close to piston D, and piston D is driven by the differential brake electric actuator; the hydraulic oil chamber A is connected to the hydraulic oil chamber C and the hydraulic oil chamber D respectively; the hydraulic oil chamber C and the hydraulic oil chamber D are connected to the hydraulic oil chamber E and the hydraulic oil chamber F respectively.

[0005] In the aforementioned airborne electric hydraulic brake system, an accumulator is connected between the hydraulic brake driver and the differential brake actuator; the accumulator is divided into an air chamber B and a hydraulic oil chamber B by a piston B, and the hydraulic oil chamber B is connected to the hydraulic oil chamber A.

[0006] In the aforementioned airborne electric hydraulic brake system, the hydraulic oil chamber A is also connected to the emergency brake actuator; the emergency brake actuator is divided into a hydraulic oil chamber G and an air chamber G by a piston H; and the hydraulic oil chamber G is connected to the hydraulic oil chamber A.

[0007] In the aforementioned airborne electric hydraulic brake system, the air chamber G is connected to the outside through a valve.

[0008] In the aforementioned airborne electric hydraulic brake system, a valve is provided between the hydraulic oil chamber G and the hydraulic oil chamber A.

[0009] In the aforementioned airborne electric hydraulic brake system, valves and valves are respectively provided between the hydraulic oil chamber A and the hydraulic oil chamber C, and between the hydraulic oil chamber A and the hydraulic oil chamber D.

[0010] A braking method for an airborne electric hydraulic brake system as described above: when braking begins, the piston of a normal electric brake driver extends, driving piston A to move and injecting the hydraulic oil in hydraulic oil chamber A into the interior of the pipeline. This will cause the oil pressure in the pipeline to increase, pushing pistons C and E to compress air chamber C and air chamber D, and simultaneously pushing pistons F and piston G to extend outward. While compressing air chambers E and air chamber F, the movable brake pads A and movable brake pads B are pushed to move, causing friction braking to be performed between them and the fixed brake pads A and fixed brake pads B.

[0011] In the braking method of the aforementioned airborne electric hydraulic brake system, when differential braking is required, the valves and valves are closed, and the differential brake electric actuator is started to drive the piston D to move left / right, thereby adjusting the pressure difference between the air chamber C and the air chamber D, and then adjusting the extrusion pressure between the movable brake pad A and the fixed brake pad A, and between the movable brake pad B and the fixed brake pad B.

[0012] In the braking method of the aforementioned airborne electric hydraulic brake system, when the normal electric brake driver fails, the valve is opened, and the high-pressure gas in the air chamber G in the emergency brake actuator pushes the piston H outward, allowing the hydraulic oil in the hydraulic oil chamber G to enter the pipeline and take over the braking work from the normal electric brake driver.

[0013] In the braking method of the aforementioned airborne electric hydraulic brake system, when the flight is over, the valve is opened, and the piston of the normal electric brake driver that has been repaired is controlled to extend, so that the piston H in the emergency brake actuator shrinks to the neutral position, and then the valve is closed, and the air cavity G is inflated from the outlet with high-pressure nitrogen, and the valve is closed after the inflation is completed.

[0014] Beneficial effects: The present invention provides an onboard electric hydraulic brake system and method for an all-electric aircraft with a larger take-off weight. This electric-driven hydraulic brake system has the characteristics of simple structure, high reliability and high safety. It is suitable for various aircraft with a larger take-off weight, especially all-electrically driven medium and large aircraft.

[0015] The system uses a motor to directly drive the actuator, pushing the brake hydraulic cylinder to generate hydraulic driving force. The hydraulic oil in the hydraulic actuator enters the landing gear brake cylinder to drive the brake pads to brake. The system can also be used in parallel with the emergency pneumatic system to ensure that compressed air can still be used for emergency braking in the event of a motor failure to ensure the safe landing of the aircraft. At the same time, the system is also designed with a deviation correction electric actuator to control the size of the left and right brake pressures in real time to achieve deviation correction operations when the aircraft is taxiing at high speed.

[0016] The present invention provides a stable and reliable braking load for the entire braking system through electric drive, and can also use compressed nitrogen for emergency braking, thereby improving the safety and reliability of the braking system.

[0017] Compared with the traditional hydraulic brake system, the electric motor drives the plunger pump to generate higher pressure, but requires the hydraulic pump to work continuously, wasting on-board energy. The electric motor of this solution can be turned on when needed, making rational use of energy.

[0018] Compared with the traditional pure electric brake device, the present invention combines the advantages of electric actuators and hydraulic actuators. In the event of a motor actuator failure, the system can still brake effectively to ensure flight safety. At the same time, it also solves the problem of unstable braking force. The reason why pure electric brakes have problems is that the motor cannot be accurately controlled under extremely small strokes, so there are only two situations for pure electric brakes, namely full braking and no braking. This system can meet the various braking force requirements in actual use by adjusting the air pressure, volume and electric brake stroke.

[0019] Compared with the traditional emergency brake system, this system is more convenient to maintain. You only need to reset the emergency brake actuator and then inflate it. The traditional emergency brake system has mixed air and oil circuits, which requires exhaust treatment of the entire pipeline after emergency braking. The process is cumbersome, and it also wastes a lot of hydraulic oil and pollutes the environment. After the traditional brake system uses emergency braking, differential braking cannot be performed. However, this system can still use differential brake electric actuators for differential braking during emergency braking. Therefore, the reliability and safety are higher than the traditional brake system, and the system is simpler and lighter.

[0020] Traditional differential braking first needs to measure the speed of the two wheels separately, and then control the brake pressure of the two wheels separately to brake independently. The whole system is very complicated and has a high failure rate. This system completely breaks the principle of traditional differential braking and uses the characteristics of pressure complementarity to achieve dynamic adjustment of the left and right brake pressures. The system has high reliability and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the structural principle of the present invention. DETAILED DESCRIPTION

[0022] Example 1. An airborne electric hydraulic braking system and method, see Figure 1 , including a normal electric brake driver 1, which is connected to the piston A2-1 of the hydraulic brake driver 2, and the piston A2-1 divides the hydraulic brake driver 2 into an air chamber A2-2 and a hydraulic oil chamber A2-3, and the hydraulic oil chamber A2-3 is connected to the differential brake actuator 4, and the differential brake actuator 4 is connected to the left brake actuator 5 and the right brake actuator 6 respectively, and the pistons F5-1 and G6-1 of the left and right brake actuators are connected to the movable brake pads A5-4 and the movable brake pads B6-4 respectively; the left brake actuator 5 is divided into a hydraulic oil chamber E5-2 and an air chamber E5-3 by the piston F5-1, and the right brake actuator 6 is connected to the hydraulic oil chamber E5-2 and the air chamber E5-3 by the piston F5-1, and the right brake actuator 6 is connected to the hydraulic oil chamber E5-3 by the piston G6-1. 1 is divided into hydraulic oil chamber F6-2 and air chamber F6-3; the differential brake actuator 4 is divided into a left chamber and a right chamber by piston D4-2; the left chamber is divided into an air chamber C4-4 and a hydraulic oil chamber C4-6 by piston C4-1, and the right chamber is divided into an air chamber D4-5 and a hydraulic oil chamber D4-7 by piston E4-3; the air chamber C4-4 and the air chamber D4-5 are both close to piston D4-2, and piston D4-2 is driven by the differential brake electric actuator 7; the hydraulic oil chamber A2-3 is connected to the hydraulic oil chamber C4-6 and the hydraulic oil chamber D4-7 respectively; the hydraulic oil chamber C4-6 and the hydraulic oil chamber D4-7 are connected to the hydraulic oil chamber E5-2 and the hydraulic oil chamber F6-2 respectively.

[0023] An accumulator 3 is connected between the aforementioned hydraulic brake driver 2 and the differential brake actuator 4; the accumulator 3 is divided into an air chamber B3-1 and a hydraulic oil chamber B3-3 by a piston B3-2, and the hydraulic oil chamber B3-3 is connected to the hydraulic oil chamber A2-3.

[0024] The aforementioned hydraulic oil chamber A2-3 is also connected to the emergency brake actuator 8; the emergency brake actuator 8 is divided into a hydraulic oil chamber G8-3 and an air chamber G8-2 by the piston H8-1; the hydraulic oil chamber G8-3 is connected to the hydraulic oil chamber A2-3.

[0025] The aforementioned air cavity G8-2 is connected to the outside world through valve 9.

[0026] A valve 10 is provided between the aforementioned hydraulic oil chamber G8-3 and the hydraulic oil chamber A2-3.

[0027] A valve 11 and a valve 12 are respectively provided between the aforementioned hydraulic oil chamber A2-3 and the hydraulic oil chamber C4-6, and between the hydraulic oil chamber A2-3 and the hydraulic oil chamber D4-7.

[0028] The aforementioned valves are all solenoid valves.

[0029] In the braking method of the aforementioned airborne electric hydraulic brake system, when braking begins, the piston of the normal electric brake driver 1 extends, driving the piston A2-1 to compress inward, and injecting the hydraulic oil in the hydraulic oil chamber A2-3 into the pipeline. At this time, the oil pressure in the pipeline will increase, thereby pushing the piston B3-2 to contract and compressing the air chamber B3-1, causing its internal pressure to increase. Similarly, it will also push the piston C4-1 and the piston E4-3 to contract inward, compress the air chamber C4-4 and the air chamber D4-5, and simultaneously push the piston F5-1 and the piston C6-1 outward, while compressing the air chamber E5-3 and the air chamber F6-3, pushing the movable brake pad A5-4 and the movable brake pad B6 -4 moves, causing friction between the fixed brake pad A5-5 and the fixed brake pad B6-5; and as the displacement of the piston of the normal electric brake driver 1 increases, the pressure in the air chamber B3-1, the air chamber C4-4, and the air chamber D4-5 will increase accordingly, and at the same time, the extrusion pressure between the movable brake pad A5-4 and the movable brake pad B6-4 and the fixed brake pad A5-5 and the fixed brake pad B6-5 will also increase accordingly. Since the displacement of the fixed brake pad A5-5 and the fixed brake pad B6-5 is very small, when the pressure in the air chamber E5-3 and the air chamber F6-3 increases to a certain extent, it will no longer increase, which is also the reason why the braking force can be adjusted normally.

[0030] When differential braking is needed, it is only necessary to close valves 11 and 12 and start the differential brake electric actuator 7. The actuator will drive the piston D4-2 to move left or right. When the differential brake electric actuator 7 is extended, it will drive the piston D4-2 to move left. At this time, the pressure in the air chamber C4-4 is greater than the pressure in the air chamber D4-5, so that the extrusion pressure between the movable brake pad A5-4 and the fixed brake pad A5-5 is greater than the extrusion pressure between the movable brake pad B6-4 and the fixed brake pad B6-5, so that the braking force of the left wheel is greater than the braking force of the right wheel, so that the aircraft can be deflected to the left, and vice versa.

[0031] When the normal electric brake driver 1 fails, the valve 10 is opened, and the high-pressure gas in the air chamber G8-2 in the emergency brake actuator 8 pushes the piston H8-1 outward, so that the hydraulic oil in the hydraulic oil chamber G8-3 enters the pipeline and takes over the braking work of the normal electric brake driver 1. After the flight, the valve 9 needs to be opened, and the piston of the normal electric brake driver 1 that has been repaired is controlled to extend, so that the piston H8-1 in the emergency brake actuator 8 shrinks to the neutral position, and then the valve 10 is closed, and the air chamber G8-2 is inflated with high-pressure nitrogen from the outlet, and the valve 9 is closed after the inflation is completed.

Claims

1. An airborne electric hydraulic brake system, characterized in that: The invention comprises a normal electric brake driver (1), which is connected to a piston A (2-1) of a hydraulic brake driver (2), wherein the piston A (2-1) divides the hydraulic brake driver (2) into an air chamber A (2-2) and a hydraulic oil chamber A (2-3), wherein the hydraulic oil chamber A (2-3) is connected to a differential brake actuator (4), wherein the differential brake actuator (4) is respectively connected to a left brake actuator (5) and a right brake actuator (6), wherein pistons F (5-1) and G (6-1) of the left and right brake actuators are respectively connected to a movable brake pad A (5-4) and a movable brake pad B (6-4); the left brake actuator (5) is divided into a hydraulic oil chamber E (5-2) and an air chamber E (5-3) via piston F (5-1), and the right brake actuator (6) is connected to a hydraulic oil chamber E (5-2) and an air chamber E (5-3) via piston G (6-1). 1) is divided into a hydraulic oil chamber F (6-2) and an air chamber F (6-3); the differential brake actuator (4) is divided into a left chamber and a right chamber through a piston D (4-2); the left chamber is divided into an air chamber C (4-4) and a hydraulic oil chamber C (4-6) through a piston C (4-1), and the right chamber is divided into an air chamber D (4-5) and a hydraulic oil chamber D (4-7) through a piston E (4-3); the air chamber C (4-4) and the air chamber D (4-5) are both close to the piston D (4-2), and the piston D (4-2) is driven by the differential brake electric actuator (7); the hydraulic oil chamber A (2-3) is connected to the hydraulic oil chamber C (4-6) and the hydraulic oil chamber D (4-7) respectively; the hydraulic oil chamber C (4-6) and the hydraulic oil chamber D (4-7) are connected to the hydraulic oil chamber E (5-2) and the hydraulic oil chamber F (6-2) respectively.

2. The airborne electric hydraulic brake system according to claim 1, characterized in that: An accumulator (3) is connected between the hydraulic brake driver (2) and the differential brake actuator (4); the accumulator (3) is divided into an air chamber B (3-1) and a hydraulic oil chamber B (3-3) by a piston B (3-2), and the hydraulic oil chamber B (3-3) is connected to the hydraulic oil chamber A (2-3).

3. The airborne electric hydraulic brake system according to claim 1, characterized in that: The hydraulic oil chamber A (2-3) is also connected to the emergency brake actuator (8); the emergency brake actuator (8) is divided into a hydraulic oil chamber G (8-3) and an air chamber G (8-2) via a piston H (8-1); the hydraulic oil chamber G (8-3) is connected to the hydraulic oil chamber A (2-3).

4. The airborne electric hydraulic brake system according to claim 3, characterized in that: The air cavity G (8-2) is connected to the outside through a valve (9).

5. The airborne electric hydraulic brake system according to claim 3, characterized in that: A valve (10) is provided between the hydraulic oil chamber G (8-3) and the hydraulic oil chamber A (2-3).

6. The airborne electric hydraulic brake system according to claim 1, characterized in that: A valve (11) and a valve (12) are respectively provided between the hydraulic oil chamber A (2-3) and the hydraulic oil chamber C (4-6), and between the hydraulic oil chamber A (2-3) and the hydraulic oil chamber D (4-7).

7. A braking method of an airborne electric hydraulic brake system according to any one of claims 1 to 6, characterized in that: When braking begins, the piston of the normal electric brake driver (1) extends out, driving the piston A (2-1) to move and inject the hydraulic oil in the hydraulic oil chamber A (2-3) into the pipeline. At this time, the oil pressure in the pipeline increases, pushing the piston C (4-1) and the piston E (4-3) to compress the air chamber C (4-4) and the air chamber D (4-5), and simultaneously pushing the piston F (5-1) and the piston G (6-1) outward, compressing the air chamber E (5-3) and the air chamber F (6-3), while pushing the movable brake pad A (5-4) and the movable brake pad B (6-4) to move, so that friction braking is performed between them and the fixed brake pad A (5-5) and the fixed brake pad B (6-5).

8. The braking method of the airborne electric hydraulic braking system according to claim 7, characterized in that: When differential braking is required, valves (11) and (12) are closed, and the differential brake electric actuator (7) is started to drive piston D (4-2) to move left / right, thereby adjusting the pressure difference between air chamber C (4-4) and air chamber D (4-5), and further adjusting the squeezing pressure between movable brake pad A (5-4) and fixed brake pad A (5-5), and between movable brake pad B (6-4) and fixed brake pad B (6-5).

9. The braking method of the airborne electric hydraulic braking system according to claim 7, characterized in that: When the normal electric brake driver (1) fails, the valve (10) is opened, and the high-pressure gas in the air chamber G (8-2) in the emergency brake actuator (8) pushes the piston H (8-1) outward, so that the hydraulic oil in the hydraulic oil chamber G (8-3) enters the pipeline, taking over the braking work of the normal electric brake driver (1).

10. The braking method of the airborne electric hydraulic braking system according to claim 9, characterized in that: When the flight is over, the valve (9) is opened, and the piston of the normal electric brake driver (1) after maintenance is controlled to extend, so that the piston H (8-1) in the emergency brake actuator (8) is retracted to the neutral position, and then the valve (10) is closed, and the air cavity G (8-2) is inflated with high-pressure nitrogen from the outlet. After the inflation is completed, the valve (9) is closed.

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