An on-board electro-hydraulic brake system and method

Abstract

The application discloses an airborne electric hydraulic brake system and method. A normal electric brake driver is connected with a piston A of a hydraulic brake driver, the piston A divides the hydraulic brake driver into a gas cavity A and a hydraulic oil cavity A, the hydraulic oil cavity A is connected with a differential brake actuator, the differential brake actuator is connected with a left brake actuator and a right brake actuator respectively, pistons F and G of the left and right brake actuators are connected with movable brake pads A and B respectively; the left brake actuator is divided into the hydraulic oil cavity E and the gas cavity E by the piston F, the right brake actuator is divided into the hydraulic oil cavity F and the gas cavity F by the piston G; the differential brake actuator is divided into left and right cavities by a piston D; the left cavity is divided into the gas cavity C and the hydraulic oil cavity C by a piston C, the right cavity is divided into the gas cavity D and the hydraulic oil cavity D by a piston E; the gas cavities C and D are close to the piston D, the piston D is driven by a differential brake electric actuator; the hydraulic oil cavity A is connected with the hydraulic oil cavities C and D respectively; the hydraulic oil cavities C and D are connected with the hydraulic oil cavities E and F respectively. The application has the characteristics of simple structure, high reliability and high safety.

Description

TECHNICAL FIELD

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

[0002] At present, the airborne brake system is a pure hydraulic or pure electric brake system. Conventional aircrafts are equipped with a hydraulic system, and the hydraulic system is used as a brake power source, which can effectively deal with various problems in the brake process. However, the electric brake may have a problem of insufficient brake force. The reason is that the feedback force of the electric motor is not accurately controlled, and the sudden change of the brake force may cause the aircraft to rush out of the runway during taxiing, which may cause safety hazards. At present, light unmanned aerial vehicles begin to gradually promote all-electric aircrafts, and the original hydraulic brake on the aircraft has been replaced by an electric motor brake. However, during the test flight, the problem of uneven brake force often occurs, which brings great inconvenience to the test flight. SUMMARY

[0003] The present application provides an airborne electric hydraulic brake system and method. The present application has the characteristics of simple structure, high reliability and high safety.

[0004] Technical scheme. An airborne electric hydraulic brake system, comprising a normal electric brake driver, the normal electric brake driver being connected with a piston A of a hydraulic brake driver, the piston A separating the hydraulic brake driver into a gas cavity A and a hydraulic oil cavity A, the hydraulic oil cavity A being connected with a differential brake actuator, the differential brake actuator being connected with a left brake actuator and a right brake actuator respectively, the piston F and the piston G of the left brake actuator and the right brake actuator being connected with movable brake pads A and movable brake pads B respectively; the left brake actuator is separated into a hydraulic oil cavity E and a gas cavity E by the piston F, and the right brake actuator is separated into a hydraulic oil cavity F and a gas cavity F by the piston G; the differential brake actuator is separated into a left cavity and a right cavity by a piston D; the left cavity is separated into a gas cavity C and a hydraulic oil cavity C by a piston C, and the right cavity is separated into a gas cavity D and a hydraulic oil cavity D by a piston E; the gas cavities C and D are close to the piston D, and the piston D is driven by a differential brake electric actuator; the hydraulic oil cavity A is connected with the hydraulic oil cavities C and D respectively; the hydraulic oil cavities C and D are connected with the hydraulic oil cavities E and F respectively.

[0005] In the foregoing airborne electric hydraulic brake system, the hydraulic brake driver and the differential brake actuator are connected with an accumulator; the accumulator is separated into a gas cavity B and a hydraulic oil cavity B by a piston B, and the hydraulic oil cavity B is connected with the hydraulic oil cavity A.

[0006] In the foregoing airborne electric hydraulic brake system, the hydraulic oil cavity A is further connected with an emergency brake actuator; the emergency brake actuator is separated into a hydraulic oil cavity G and a gas cavity G by a piston H; the hydraulic oil cavity G is communicated with the hydraulic oil cavity A.

[0007] In the foregoing airborne electric hydraulic brake system, the gas cavity G is communicated with the outside through a valve.

[0008] In the foregoing airborne electric hydraulic brake system, a valve is arranged between the hydraulic oil cavity G and the hydraulic oil cavity A.

[0009] In the foregoing airborne electric hydraulic brake system, a valve and a valve are respectively arranged between the hydraulic oil cavity A and the hydraulic oil cavity C and between the hydraulic oil cavity A and the hydraulic oil cavity D.

[0010] A brake method of the foregoing airborne electric hydraulic brake system: when starting braking, the piston of the normal electric brake driver extends, drives the piston A to move and injects the hydraulic oil in the hydraulic oil cavity A into the pipeline, at this time, the oil pressure in the pipeline is increased, the piston C and the piston E are compressed, the piston F and the piston G are synchronously extended, the gas cavities E and F are compressed, the movable brake pads A and B are driven to move, and the movable brake pads A and B are rubbed with the fixed brake pads A and B.

[0011] In the foregoing brake method of the airborne electric hydraulic brake system, when differential braking is needed, the valves are closed, the piston D is driven to move left and right by the differential brake electric actuator, the pressure difference between the gas cavities C and D is adjusted, and then the pressing force between the movable brake pads A and the fixed brake pads A and between the movable brake pads B and the fixed brake pads B is adjusted.

[0012] In the foregoing brake method of the airborne electric hydraulic brake system, when the normal electric brake driver fails, the valve is opened, the high-pressure gas in the gas cavity G of the emergency brake actuator drives the piston H to extend, the hydraulic oil in the hydraulic oil cavity G enters the pipeline, and the normal electric brake driver is replaced to perform braking work.

[0013] In the foregoing brake method of the airborne electric hydraulic brake system, after flight, the valve is opened, the piston of the normal electric brake driver after being repaired is controlled to extend, the piston H in the emergency brake actuator is retracted to the neutral position, then the valve is closed, the gas cavity G is inflated by using high-pressure nitrogen gas from the gas outlet, and after the inflation is completed, the valve is closed.

[0014] Beneficial effects: the airborne electric hydraulic brake system and method for a full-electric airplane with a larger take-off weight are provided, the electric drive hydraulic brake system has the characteristics of simple structure, high reliability and high safety, is suitable for various aircrafts with a larger take-off weight, and is especially suitable for full-electric medium and large aircrafts.

[0015] The system drives the brake hydraulic actuator cylinder by the motor direct drive actuator, the hydraulic oil in the hydraulic actuator enters the landing gear brake actuator cylinder, drives the brake pad to move, brakes, the system can also be used in parallel with the emergency pneumatic system, ensures that the motor fails, still can use compressed air to perform emergency braking, ensures the safe landing of the aircraft. Meanwhile, the system also designs a deviation electric actuator for real-time control of the size of the left and right brake pressure, realizes the deviation operation of the aircraft during high-speed sliding.

[0016] The application provides stable and reliable brake load for the whole brake system by electric driving, and also can use compressed nitrogen for emergency braking, thereby improving the safety and reliability of the brake system.

[0017] Compared with the traditional hydraulic brake system, the motor drives the plunger pump to work, and higher pressure can be generated, but the hydraulic pump needs to work continuously, and energy on the aircraft is wasted, the motor of the scheme can be started as needed, and energy is reasonably utilized.

[0018] Compared with the traditional pure electric brake device, the application combines the advantages of the electric actuator and the hydraulic actuator, and the system can still effectively brake in the case of motor actuator failure, thereby ensuring flight safety. Meanwhile, the problem of unstable brake force is solved, and the problem of pure electric brake is that the motor cannot be accurately controlled under a very small stroke, so that the pure electric brake has only two conditions, that is, full brake and no brake. The system can meet the demand for various brake forces in actual use by adjusting the air pressure, volume and electric brake stroke.

[0019] Compared with the traditional emergency brake system, the system is more convenient to maintain, only needs to reset the emergency brake actuator and then inflate, the traditional emergency brake system mixes the air path and the oil path, so that the entire pipeline needs to be exhausted after emergency braking, the process is complicated, a large amount of hydraulic oil is wasted, and the environment is polluted. After the traditional brake system adopts the emergency brake, differential braking cannot be performed, but the system can still perform differential braking by using the differential brake electric actuator during emergency braking, so that the reliability and safety are higher than those of the traditional brake system, and the system is more simple and light in weight.

[0020] The traditional differential brake needs to measure the speeds of two wheels respectively, and then control the brake pressures of the two wheels respectively, so that the brake is performed separately, the whole system is very complex, and the failure rate is high. The system breaks the principle of the traditional differential brake, realizes dynamic adjustment of the left and right brake pressures by using the pressure complementary feature, and the system has high reliability and lower cost. BRIEF DESCRIPTION OF DRAWINGS

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

[0022] Embodiment 1. An airborne electric hydraulic brake system and method, see Figure 1 , comprising a normal electric brake driver 1, the normal electric brake driver 1 is connected with a piston A2-1 of a hydraulic brake driver 2, the piston A2-1 separates the hydraulic brake driver 2 into an air cavity A2-2 and a hydraulic oil cavity A2-3, the hydraulic oil cavity A2-3 is connected with a differential brake actuator 4, the differential brake actuator 4 is connected with a left brake actuator 5 and a right brake actuator 6 respectively, the pistons F5-1 and G6-1 of the left and right brake actuators are connected with movable brake pads A5-4 and B6-4 respectively; the left brake actuator 5 is separated into a hydraulic oil cavity E5-2 and an air cavity E5-3 through the piston F5-1, the right brake actuator 6 is separated into a hydraulic oil cavity F6-2 and an air cavity F6-3 through the piston G6-1; the differential brake actuator 4 is separated into a left cavity and a right cavity through a piston D4-2; the left cavity is separated into an air cavity C4-4 and a hydraulic oil cavity C4-6 through a piston C4-1, the right cavity is separated into an air cavity D4-5 and a hydraulic oil cavity D4-7 through a piston E4-3; the air cavities C4-4 and D4-5 are close to the piston D4-2, the piston D4-2 is driven by a differential brake electric actuator 7; the hydraulic oil cavity A2-3 is connected with the hydraulic oil cavities C4-6 and D4-7 respectively; the hydraulic oil cavities C4-6 and D4-7 are connected with the hydraulic oil cavities E5-2 and F6-2 respectively.

[0023] The hydraulic brake driver 2 and the differential brake actuator 4 are connected with an accumulator 3; the accumulator 3 is separated into an air cavity B3-1 and a hydraulic oil cavity B3-3 through a piston B3-2, the hydraulic oil cavity B3-3 is connected with the hydraulic oil cavity A2-3.

[0024] The hydraulic oil cavity A2-3 is also connected with an emergency brake actuator 8; the emergency brake actuator 8 is separated into a hydraulic oil cavity G8-3 and an air cavity G8-2 through a piston H8-1; the hydraulic oil cavity G8-3 is connected with the hydraulic oil cavity A2-3.

[0025] The air cavity G8-2 is connected with the outside through a valve 9.

[0026] The hydraulic oil cavity G8-3 and the hydraulic oil cavity A2-3 are provided with a valve 10.

[0027] The hydraulic oil cavity A2-3 and the hydraulic oil cavity C4-6 are provided with a valve 11, and the hydraulic oil cavity A2-3 and the hydraulic oil cavity D4-7 are provided with a valve 12.

[0028] The valves are all electromagnetic valves.

[0029] The brake method of the aforementioned airborne electric hydraulic brake system, when starting braking, the piston of the normal electric brake driver 1 extends, drives the piston A2-1 to compress inward, injects the hydraulic oil in the hydraulic oil cavity A2-3 into the pipeline, at this time, the oil pressure in the pipeline increases, thereby pushing the piston B3-2 to contract, compressing the air cavity B3-1, increasing the internal pressure, and in the same way, also pushing the piston C4-1 and the piston E4-3 to contract inward, compressing the air cavity C4-4, the air cavity D4-5, synchronously pushing the piston F5-1 and the piston C6-1 to extend outward, compressing the air cavity E5-3 and the air cavity F6-3, and pushing the movable brake pad A5-4 and the movable brake pad B6-4 to move, so as to rub with the fixed brake pad A5-5 and the fixed brake pad B6-5; and with the increase of the displacement of the piston of the normal electric brake driver 1 extending, the pressure in the air cavity B3-1, the air cavity C4-4, and the air cavity D4-5 increases correspondingly, and the extrusion force 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 also increases correspondingly, since the displacement of the fixed brake pad A5-5 and the fixed brake pad B6-5 is very small, when the pressure of the air cavity E5-3 and the air cavity F6-3 increases to a certain degree, it will not increase any more, which is the reason why the brake force can be normally adjusted.

[0030] When differential braking is needed, only the valve 11 and the valve 12 need to be closed, and the differential brake electric actuator 7 is started, which drives the piston D4-2 to move leftward or rightward, when the differential brake electric actuator 7 extends, the piston D4-2 moves leftward, at this time, the pressure in the air cavity C4-4 is greater than the pressure in the air cavity D4-5, so that the extrusion force between the movable brake pad A5-4 and the fixed brake pad A5-5 is greater than the extrusion force between the movable brake pad B6-4 and the fixed brake pad B6-5, thereby the brake force of the left wheel is greater than the brake force of the right wheel, realizing the deflection of the airplane to the left, and vice versa.

[0031] When the normal electric brake driver 1 fails, at this time, the valve 10 is opened, the high-pressure gas in the air cavity G8-2 in the emergency brake actuator 8 pushes the piston H8-1 to extend outward, so that the hydraulic oil in the hydraulic oil cavity G8-3 enters the pipeline, replacing the normal electric brake driver 1 to brake. After the flight is finished, the valve 9 needs to be opened, and the piston of the normal electric brake driver 1 after being repaired is controlled to extend, so that the piston H8-1 in the emergency brake actuator 8 contracts to the neutral position, then the valve 10 is closed, and the air cavity G8-2 is inflated by high-pressure nitrogen gas from the gas outlet, and after the inflation is finished, the valve 9 is closed.

Claims

1. An airborne electro-hydraulic brake system, characterized in that, The application relates to a differential brake actuator, which comprises a normal electric brake driver (1), a hydraulic brake driver (2), a differential brake actuator (4), a left brake actuator (5), a right brake actuator (6), an emergency brake actuator (8), a pressure accumulator (3) and a valve (9).

2. The on-board electro-hydraulic brake system of claim 1, wherein, The hydraulic brake driver (2) is connected with the differential brake actuator (4) and is provided with the pressure accumulator (3); the pressure accumulator (3) is divided into a gas cavity B (3-1) and a hydraulic oil cavity B (3-3) by a piston B (3-2); the hydraulic oil cavity B (3-3) is communicated with the hydraulic oil cavity A (2-3).

3. The on-board electro-hydraulic brake system of claim 1, wherein, The hydraulic oil cavity A (2-3) is further connected with the emergency brake actuator (8); the emergency brake actuator (8) is divided into a hydraulic oil cavity G (8-3) and a gas cavity G (8-2) by a piston H (8-1); the hydraulic oil cavity G (8-3) is communicated with the hydraulic oil cavity A (2-3).

4. The on-board electro-hydraulic brake system of claim 3, wherein, The gas cavity G (8-2) is communicated with the outside through the valve (9).

5. The on-board electro-hydraulic brake system of claim 3, wherein, The hydraulic oil cavity G (8-3) and the hydraulic oil cavity A (2-3) are provided with the valve (10).

6. The on-board electro-hydraulic brake system of claim 1, wherein, The hydraulic oil cavity A (2-3) and the hydraulic oil cavity C (4-6) and the hydraulic oil cavity A (2-3) and the hydraulic oil cavity D (4-7) are respectively provided with the valve (11) and the valve (12).

7. A method of braking for an airborne electro-hydraulic brake system as claimed in any one of claims 1 to 6, characterised in that, When the brake is started, the piston of the normal electric brake driver (1) is extended, which drives the piston A (2-1) to move and inject the hydraulic oil in the hydraulic oil cavity A (2-3) into the pipeline, at this time, the oil pressure in the pipeline is increased, the piston C (4-1) and the piston E (4-3) are compressed, the air cavity C (4-4) and the air cavity D (4-5) are compressed, the piston F (5-1) and the piston G (6-1) are extended, the air cavity E (5-3) and the air cavity F (6-3) are compressed, and the movable brake pad A (5-4) and the movable brake pad B (6-4) are moved to rub with the fixed brake pad A (5-5) and the fixed brake pad B (6-5).

8. The brake method of the airborne electro-hydraulic brake system according to claim 7, characterized by, When the differential brake is needed, the valve (11) and the valve (12) are closed, the differential brake electric actuator (7) is started to drive the piston D (4-2) to move left / right, the pressure difference between the air cavity C (4-4) and the air cavity D (4-5) is adjusted, and then the pressing force between the movable brake pad A (5-4) and the fixed brake pad A (5-5) and between the movable brake pad B (6-4) and the fixed brake pad B (6-5) is adjusted.

9. The brake method of the airborne electro-hydraulic brake system according to claim 7, characterized by, When the normal electric brake driver (1) fails, the valve (10) is opened, the high-pressure gas in the air cavity G (8-2) of the emergency brake actuator (8) pushes the piston H (8-1) to extend, the hydraulic oil in the hydraulic oil cavity G (8-3) enters the pipeline, and the normal electric brake driver (1) performs brake work.

10. The brake method of the airborne electro-hydraulic brake system according to claim 9, characterized by, After the flight is finished, the valve (9) is opened, the piston of the normal electric brake driver (1) is extended, the piston H (8-1) in the emergency brake actuator (8) is retracted to the neutral position, the valve (10) is closed, high-pressure nitrogen gas is used to inflate the air cavity G (8-2) from the gas outlet, and after the inflation is finished, the valve (9) is closed.

Images