Brake control system for a vehicle, vehicle and train

Abstract

The application provides a brake control system of a vehicle, a vehicle and a train, wherein a first air port of a relay valve is connected with an air cylinder through a distribution valve, a second air port of the relay valve is connected with a brake pipe through a switch structure; a third air port of the relay valve is connected with the air cylinder, and a fourth air port of the relay valve is connected with a brake cylinder; a conversion device is connected with the distribution valve; the conversion device is connected with the switch structure; when the conversion device is in different gears, the distribution valve inputs different pressure gases to the first air port of the relay valve, and the switch structure controls the input of different pressure gases to the second air port of the relay valve, so that the relay valve controls the pressure of the flowing gas between the third air port of the relay valve and the fourth air port of the relay valve under the action of the distribution valve and the switch structure, and inputs different pressure gases to the brake cylinder, so that the vehicle can meet the brake requirements on two different lines.

Description

TECHNICAL FIELD

[0001] The present application relates to vehicle braking technology, in particular to a vehicle braking control system, a vehicle and a train. BACKGROUND

[0002] With the development of rail transportation, the current transportation of goods can be transported by national railway lines or subway lines.

[0003] Because the national railway line and the subway line have different requirements for the deceleration and braking distance of the vehicle braking, in the prior art, two different braking control systems can be installed in the vehicle to adapt to different requirements of the vehicle braking of different lines.

[0004] However, directly installing two braking control systems in the vehicle will increase the manufacturing cost and the maintenance cost of the vehicle. SUMMARY

[0005] The vehicle braking control system, the vehicle and the train provided by the present application are used to solve the problem that two different braking systems need to be installed when the vehicle runs on the national railway line and the subway line, so as to increase the manufacturing and maintenance cost of the vehicle.

[0006] In a first aspect, the present application provides a vehicle braking control system, comprising: a relay valve, a distribution valve, a switch structure and a conversion device; wherein a first gas port of the relay valve is connected with an air cylinder through the distribution valve, a second gas port of the relay valve is connected with a brake pipe through the switch structure; a third gas port of the relay valve is connected with the air cylinder, and a fourth gas port of the relay valve is connected with a brake cylinder; the conversion device is connected with the distribution valve; and the conversion device is connected with the switch structure.

[0007] The air cylinder is used to input gas to the distribution valve and the third gas port of the relay valve when the brake pipe is exhausted.

[0008] The brake pipe is used to exhaust gas to the switch structure.

[0009] The conversion device is used to control the distribution valve to output gas with different pressures to the first gas port of the relay valve when the conversion device is located at different gears, and control the switch structure to output gas with different pressures to the second gas port of the relay valve when the conversion device is located at different gears.

[0010] The relay valve is used to control the pressure of the flowing gas between the third gas port of the relay valve and the fourth gas port of the relay valve according to the gas with different pressures from the first gas port of the relay valve and the gas with different pressures from the second gas port of the relay valve, so as to input gas with different pressures to the brake cylinder.

[0011] In a possible design, the switch structure includes a cut-off switch and a one-way valve; a first gas port of the cut-off switch is connected with a second gas port of the relay valve, a second gas port of the cut-off switch is connected with the brake pipe; a gas outlet of the one-way valve is connected with a third gas port of the cut-off switch, a gas inlet of the one-way valve is connected with the brake pipe; the switching device is connected with the cut-off switch; the first gas port of the cut-off switch is adjacent to the third gas port of the cut-off switch.

[0012] The switching device is specifically configured to control the cut-off switch to be opened or closed when the switching device is located at different gears, so that the brake pipe outputs gas with different pressures to the second gas port of the relay valve through the switch structure.

[0013] In a possible design, the switching device is specifically configured to control the cut-off switch to be closed when the switching device is located at a first gear of the different gears, and control the cut-off switch to be opened when the switching device is located at a second gear of the different gears.

[0014] In a possible design, the relay valve includes a first valve body, a second valve body and a balance beam; the first valve body and the second valve body are located at two ends of the balance beam.

[0015] The third gas port of the relay valve and the fourth gas port of the relay valve are located on the first valve body, and the second gas port of the relay valve is located on the second valve body; the first valve body and the second valve body are communicated through a first communication pipe, and the first gas port of the relay valve is located on the first communication pipe.

[0016] The second valve body is configured to apply different pressures to the first valve body through the balance beam when the first gas port of the relay valve is input with gas with different pressures and the second gas port of the relay valve is input with gas with different pressures, so that the pressure of the flowing gas between the third gas port of the relay valve and the fourth gas port of the relay valve changes.

[0017] In a possible design, the first valve body is provided with a pressure limiting valve and a first control valve; the bottom end of the first control valve is arranged on the first end of the balance beam, and the pressure limiting valve is located on the top of the first control valve.

[0018] The distribution valve is configured to input gas with a first pressure to the first gas port of the relay valve when the switching device is located at a first gear of the different gears, and input gas with a second pressure to the first gas port of the relay valve when the switching device is located at a second gear of the different gears, the first pressure being greater than the second pressure.

[0019] The switch structure is configured to input a first gas pressure gas to a second port of the relay valve when the conversion device is located at a first gear of the different gears; control the gas pressure at the second port of the relay valve to be a second gas pressure smaller than the first gas pressure when the conversion device is located at a second gear of the different gears and the gas pressure of the brake pipe is a third pressure; and control the gas pressure at the second port of the relay valve to be a third gas pressure smaller than the second gas pressure when the conversion device is located at the second gear of the different gears and the gas pressure of the brake pipe is a fourth pressure smaller than the third pressure.

[0020] The second valve body is configured to apply a first force to the first control valve through the balance beam based on the first pressure gas and the first gas pressure gas, apply a second force to the first control valve through the balance beam based on the second pressure gas and the second gas pressure gas, and apply a third force to the first control valve through the balance beam based on the second pressure gas and the third gas pressure gas, the third force being greater than the second force.

[0021] The first control valve is configured to lift the pressure limiting valve based on the first pressure to make the third port of the relay valve and the fourth port of the relay valve communicate and the size of a cavity in the first valve body between the third port of the relay valve and the fourth port of the relay valve be a first size, lift the pressure limiting valve based on the second pressure to make the third port of the relay valve and the fourth port of the relay valve communicate and the size of the cavity in the first valve body between the third port of the relay valve and the fourth port of the relay valve be a second size greater than the first size, and lift the pressure limiting valve based on the third pressure to make the third port of the relay valve and the fourth port of the relay valve communicate and the size of the cavity in the first valve body between the third port of the relay valve and the fourth port of the relay valve be a third size greater than the second size.

[0022] In a possible design, the second valve body is provided with a first cavity and a second cavity; the second port of the relay valve is located on the first cavity, the first cavity is provided with a first piston, and the first cavity is provided with a first port communicating with the atmosphere;

[0023] The second cavity is provided with an upper die plate, a lower die plate and a second control valve; the lower die plate penetrates the second control valve, and the upper die plate is located at the top end of the second control valve; the lower end of the second cavity is provided with a second port communicating with the atmosphere; and the bottom end of the second control valve is arranged on the second end of the balance beam.

[0024] The second communication pipe and the third communication pipe are connected between the first cavity and the second cavity; the first communication pipe and the second communication pipe are in communication, one end of the third communication pipe is adjacent to the first port, and the other end of the third communication pipe is located between the upper die plate and the lower die plate.

[0025] The first piston is configured to, based on the gas at the first pressure and the gas at the first air pressure not moving, make the gas at the lower end of the upper die plate communicate with the atmosphere through the third communication pipe, the first port, and the atmosphere, so that the upper die plate applies a first force to the second control valve; based on the gas at the second pressure and the gas at the second air pressure not moving, make the upper die plate apply a second force to the second control valve, the second force being greater than the first force; and based on the gas at the second pressure and the gas at the third air pressure moving, make the second communication pipe and the third communication pipe communicate, so that the lower die plate applies a third force to the second control valve, the third force being greater than the second force.

[0026] The second control valve is configured to, based on the first force, apply the first force to the first control valve through the balance beam; based on the second force, apply the second force to the first control valve through the balance beam; and based on the third force, apply the third force to the first control valve through the balance beam.

[0027] In a possible design, the relay valve further includes a support point for supporting the balance and a second piston; one end of the support point is connected to the second piston, and the other end of the second piston is connected to the empty and heavy vehicle adjusting device.

[0028] In a possible design, the first air port of the distribution valve is connected to the first air port of the relay valve, the second air port of the distribution valve is connected to the air cylinder, and the third air port of the distribution valve is connected to the brake pipe.

[0029] The distribution valve is specifically configured to, when the switching device is located at the first gear of the different gears, input, according to the output gas of the air cylinder, the gas at the first pressure from the first air port of the distribution valve to the first air port of the relay valve; and when the switching device is located at the second gear of the different gears, input, according to the output gas of the air cylinder, the gas at the second pressure from the first air port of the distribution valve to the first air port of the relay valve.

[0030] In a second aspect, the embodiments of the present application provide a vehicle, wherein the vehicle is provided with the brake control system according to the first aspect.

[0031] In a possible design, the vehicle is further provided with a wind cylinder and a brake pipe; the brake pipe is connected with the wind cylinder through the distribution valve;

[0032] The brake pipe is configured to charge the wind cylinder with air.

[0033] In a possible design, the vehicle is further provided with a wind cylinder, a brake pipe and a main wind pipe; the main wind pipe is connected with the wind cylinder;

[0034] The main wind pipe is configured to charge the wind cylinder with air.

[0035] In a third aspect, an embodiment of the present application provides a train, which comprises a locomotive and the vehicle according to the second aspect; the locomotive is configured to provide power for the vehicle.

[0036] The vehicle provided by the present application is provided with a brake control system, a vehicle and a train, wherein the first air port of the relay valve is connected with the wind cylinder through the distribution valve, the second air port of the relay valve is connected with the brake pipe through the switch structure, the third air port of the relay valve is connected with the wind cylinder, and the fourth air port of the relay valve is connected with the brake cylinder; the switching device is connected with the distribution valve and the switch structure; when the switching device is in different gears, the distribution valve inputs different pressure air to the first air port of the relay valve, and the switch structure inputs different pressure air to the second air port of the relay valve, so that the relay valve controls the pressure of the flowing air between the third air port and the fourth air port of the relay valve under the action of the distribution valve and the switch structure, to input different pressure air to the brake cylinder, so that the vehicle can meet the braking requirements on two different lines. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0038] Figure 1 FIG. 1 is a structural schematic diagram of a brake control system of a vehicle provided by an embodiment of the present application;

[0039] Figure 2 FIG. 2 is a structural schematic diagram of another brake control system of a vehicle provided by an embodiment of the present application;

[0040] Figure 3 FIG. 3 is a structural schematic diagram of a relay valve provided by an embodiment of the present application.

[0041] Reference signs:

[0042] 1: relay valve;

[0043] 11: first air port of the relay valve;

[0044] 12: second air port of relay valve;

[0045] 13: third air port of relay valve;

[0046] 14: fourth air port of relay valve;

[0047] 15: other end of second piston;

[0048] 161: first communication pipe;

[0049] 162: second communication pipe;

[0050] 163: third communication pipe;

[0051] 17: balance beam;

[0052] 18: pressure limiting valve;

[0053] 191: first control valve;

[0054] 192: second control valve;

[0055] 101: first piston;

[0056] 102: upper die plate;

[0057] 103: lower die plate;

[0058] 2: distribution valve;

[0059] 21: first air port of distribution valve;

[0060] 22: second air port of distribution valve;

[0061] 23: third air port of distribution valve;

[0062] 3: switch structure;

[0063] 4: conversion device;

[0064] 5: air cylinder;

[0065] 6: brake pipe;

[0066] 7: brake cylinder;

[0067] 8: cut-off switch;

[0068] 81: first air port of cut-off switch;

[0069] 82: second air port of cut-off switch;

[0070] 83: third air port of cut-off switch;

[0071] 9: check valve. DETAILED DESCRIPTION

[0072] The embodiment of the present application is applied to a brake control system of a vehicle, the vehicle and a train. It should be noted that when the scheme of the embodiment of the present application is applied to the brake control system of the present vehicle or the brake control system of the future vehicle, the names of various structures may change, but this does not affect the implementation of the scheme of the embodiment of the present application.

[0073] The vehicle is an important means of transportation for long-distance travel of human beings, and is also one of the important tools for cargo transportation. When transporting goods over a long distance, a national railway line or a subway line can usually be used for transportation.

[0074] Since the track of the national railway line is long, a longer braking distance can be provided for the vehicle, and the deceleration of the vehicle during braking is smaller; and the track of the subway line is shorter relative to the national railway line, so that a shorter braking distance is provided for the vehicle, and the deceleration of the vehicle during braking is higher. Therefore, for a vehicle that can run on both the subway line and the national railway line, the braking system on the vehicle needs to adapt to the different requirements of the two lines.

[0075] In one example, two different brake control systems can be installed on the vehicle to adapt to different requirements of different lines for vehicle braking. However, directly installing two different brake control systems in the vehicle increases the manufacturing cost of the vehicle, and in the process of later repair and maintenance, more manpower and material resources are also wasted, and the repair and maintenance cost is also correspondingly increased.

[0076] The present application provides a brake control system of a vehicle, a vehicle and a train, aiming at solving the above technical problems of the prior art.

[0077] Figure 1 A structural schematic diagram of a brake control system of a vehicle provided by the embodiment of the present application is shown in FIG. 1. As shown in the figure, the brake control system of the vehicle comprises: Figure 1

[0078] a relay valve 1, a distribution valve 2, a switch structure 3 and a conversion device 4; wherein the first gas port 11 of the relay valve is connected with the air cylinder 5 through the distribution valve 2, the second gas port 12 of the relay valve is connected with the brake pipe 6 through the switch structure 3; the third gas port 13 of the relay valve is connected with the air cylinder 5, and the fourth gas port 14 of the relay valve is connected with the brake cylinder 7; the conversion device 4 is connected with the distribution valve 2; and the conversion device 4 is connected with the switch structure 3.

[0079] The air cylinder 5 is used to input gas to the distribution valve 2 and the third gas port 13 of the relay valve when the brake pipe 6 is exhausted.

[0080] The brake pipe 6 is used to exhaust air to the switch structure 3.

[0081] ​The switching device 4 is used to control the distribution valve 2 to output gas with different pressure to the first gas port 11 of the relay valve when the switching device 4 is located at different gears, and control the switch structure 3 to output gas with different pressure to the second gas port 12 of the relay valve when the switching device 4 is located at different gears.

[0082] The relay valve 1 is used to control the pressure of the gas flowing between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve according to the gas with different pressure from the first gas port 11 of the relay valve and the gas with different pressure from the second gas port 12 of the relay valve, so as to input gas with different pressure to the brake cylinder 6.

[0083] Exemplarily, since different lines have different requirements for the deceleration of the vehicle braking, it is necessary to provide a vehicle braking control system which can meet the requirements of the vehicle braking on different lines at the same time.

[0084] In order to meet the requirements of the vehicle braking on two lines (subway line and national railway line), the vehicle braking control system provided in the embodiment is provided with a relay valve 1, a distribution valve 2, a switch structure 3 and a switching device 4. The relay valve 1 at least includes the following gas ports: the first gas port 11 of the relay valve, the second gas port 12 of the relay valve, the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve. In order to complete the control process of the vehicle braking provided in the embodiment, the first gas port 11 of the relay valve is connected with the air cylinder 3 through the distribution valve 2, and the air cylinder 3 can pre-store gas, and when the vehicle brakes, the air cylinder 3 can provide pressure at the first gas port 11 of the relay valve through the distribution valve 2; the second gas port 12 of the relay valve is connected with the brake pipe 6 through the switch structure 3, that is, the gas in the brake pipe 6 can be applied to the second gas port 12 of the relay valve through the switch structure 3 by applying a certain pressure to the switch structure 3; the third gas port 13 of the relay valve is connected with the air cylinder 5, and the fourth gas port 14 of the relay valve is connected with the brake cylinder 7; the switching device 4 is connected with the distribution valve 2; the switching device 4 is connected with the switch structure 3;

[0085] A third control valve is arranged on the brake pipe 6 of the vehicle, and the third control valve is used to control the exhaust and inflation process of the brake pipe 6. When the vehicle needs to brake, the user can control the third control valve to exhaust the brake pipe 6. When the brake pipe 6 is exhausted, since the first gas port 11 of the relay valve is communicated with the air cylinder 5 through the distribution valve 2, the gas in the air cylinder 5 can flow to the distribution valve 2 and then flow to the first gas port 11 of the relay valve, and the gas in the air cylinder 5 also flows to the third gas port 13 of the relay valve.

[0086] Further, the conversion device 4 is an adjusting device with different gears, the conversion device 4 is connected with the handle adjusting the output pressure in the distribution valve 2 through a connecting rod, and by adjusting the gears of the conversion device 4, the connecting rod drives the handle adjusting the output pressure in the distribution valve 2 to change the position, so that the distribution valve 2 outputs gas with different pressures. When the vehicle is running, by adjusting the gears of the conversion device 4, the distribution valve 2 outputs gas with different pressures, and further, when the vehicle is braking, by adjusting the third control valve, the brake pipe 6 is exhausted, the pressure in the brake pipe 6 drops, at this time, the passage of the distribution valve 2 at the first air port 11 of the relay valve is opened, so that the gas in the air cylinder 5 flows to the distribution valve 2, and the gas flowing to the first air port 11 of the relay valve through the distribution valve 2 is gas with different pressures.

[0087] Further, the conversion device 4 is also connected with the switch structure 3 through a connecting rod, when the vehicle is braking, the brake pipe 6 is exhausted and the pressure drops, so one end of the switch structure 3 connected with the brake pipe 6 provides pressure, when the gears of the conversion device 4 are adjusted, the air path between one end and the other end of the switch structure 3 changes, and further, the air pressure of one end of the switch structure 3 to the other end of the switch structure 3 also changes, and further, the second air port 12 of the relay valve connected with the other end of the switch structure also outputs gas with different pressures.

[0088] In the relay valve 1, according to the gas with different pressures at the first air port 11 of the relay valve and the gas with different pressures at the second air port 12 of the relay valve, the passage between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve is connected, so that the gas in the air cylinder 5 can flow to the brake cylinder through the third air port 13 of the relay valve and the fourth air port 14 of the relay valve in turn, and because the conversion device is in different gears, the pressure at the first air port 11 of the relay valve will be different, and the pressure at the second air port 12 of the relay valve will also be different, so that the gas pressure of the air cylinder 5 input into the brake cylinder 7 through the relay valve 1 will also be different. Because the brake cylinder 7 is connected with the vehicle wheels through a connecting structure, when the gas in the brake cylinder 7 is at different pressures, the brake cylinder 7 will exert different forces on the wheels through the connecting structure, so that the wheels will brake at different deceleration under the action of different forces, and further, the braking system in the vehicle can be suitable for different line requirements at the same time.

[0089] In the embodiment, a brake control system of a vehicle is provided, wherein the first air port 11 of the relay valve is connected with the air cylinder 5 through the distribution valve 2, the second air port 12 of the relay valve is connected with the brake pipe 6 through the switch structure 3, the third air port 13 of the relay valve is connected with the air cylinder 5, the fourth air port 14 of the relay valve is connected with the brake cylinder 7, the switch device 4 is connected with the distribution valve 2, the switch device 4 is connected with the switch structure 3, when the switch device 4 is in different gears, the distribution valve 2 inputs different pressure gases to the first air port 11 of the relay valve, and the switch structure 3 controls the input of different pressure gases to the second air port 12 of the relay valve, so that the relay valve 1 controls the pressure of the flowing gas between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve under the action of the distribution valve 2 and the switch structure 3, so as to input different pressure gases to the brake cylinder 7, so that the vehicle can meet the brake requirements on two different lines, and the vehicle can avoid installing two different brake control systems at the same time, thereby reducing the manufacturing cost and maintenance cost of the vehicle, and the brake control system of the vehicle does not need power supply, thereby saving the electricity cost.

[0090] Figure 2 Another structure schematic diagram of a brake control system of a vehicle provided by the embodiment is shown in the figure. Figure 2 As shown in the embodiment, the switch structure 3 further comprises a cut-off switch 8 and a one-way valve 9. Figure 1 The first air port 81 of the cut-off switch is connected with the second air port 12 of the relay valve, the second air port 82 of the cut-off switch is connected with the brake pipe 6, the gas outlet of the one-way valve 9 is connected with the third air port 83 of the cut-off switch, and the gas inlet of the one-way valve 9 is connected with the brake pipe 6.

[0091] The switch device 4 is specifically used for controlling the cut-off switch 8 to be opened or closed when the switch device 4 is in different gears, so that the brake pipe 6 outputs different pressure gases to the second air port 12 of the relay valve through the switch structure 3.

[0092] In one example, the switch device 4 is specifically used for controlling the cut-off switch 8 to be closed when the switch device 4 is in the first gear of different gears, and controlling the cut-off switch 8 to be opened when the switch device 4 is in the second gear of different gears.

[0093] In one example, the first air port 21 of the distribution valve is connected with the first air port 11 of the relay valve, the second air port 22 of the distribution valve is connected with the air cylinder 5, and the third air port 23 of the distribution valve is connected with the brake pipe 6.

[0094] The distribution valve 2 is configured to input the first pressure gas to the first port 11 of the relay valve through the first port 21 of the distribution valve according to the output gas of the air cylinder 5 when the switching device 4 is located at the first gear of the different gears; and the distribution valve 2 is configured to input the second pressure gas to the first port 11 of the relay valve through the first port 21 of the distribution valve according to the output gas of the air cylinder 5 when the switching device 4 is located at the second gear of the different gears.

[0095] Exemplarily, based on the embodiment shown in the figure, the switch structure 3 can specifically include the cut-off switch 8 and the one-way valve 9. The cut-off switch 8 includes the first port 81, the second port 82 and the third port 83 of the cut-off switch. The one-way valve 9 includes the inlet port and the outlet port of the one-way valve. The distribution valve 2 includes the first port 21, the second port 22 and the third port 23 of the distribution valve. Figure 1

[0096] In order to complete the control process of the vehicle braking, the first port 81 of the cut-off switch is connected to the second port 12 of the relay valve, the second port 82 of the cut-off switch is connected to the brake pipe 6, and then when the cut-off switch 8 is opened, the second port 12 of the relay valve is connected to the brake pipe 6 through the cut-off switch 8, so that the pressure at the second port 12 of the relay valve decreases with the decrease of the pressure in the brake pipe 6; the outlet port of the one-way valve 9 is connected to the third port 83 of the cut-off switch, and the inlet port of the one-way valve 9 is connected to the brake pipe 6, i.e. the gas in the brake pipe 6 can flow to the second port 12 of the relay valve through the one-way valve 9, and when the pressure of the brake pipe 6 decreases, the gas at the second port 12 of the relay valve cannot flow to the brake pipe 6 through the one-way valve 9; the switching device 4 is connected to the cut-off switch 8 through a connecting rod.

[0097] The switching device 4 has two different gears, i.e. the first gear and the second gear. The first gear is suitable for the national railway line, and the second gear is suitable for the subway line. When the switching device 4 is adjusted to the first gear, the switching device 4 drives the connecting rod connected to the cut-off switch 8, so that the cut-off switch 8 is closed, i.e. the gas path between the first port 81 of the cut-off switch and the second port 82 of the cut-off switch is closed. When the vehicle is running, the gas in the brake pipe 6 can be transmitted to the second port 12 of the relay valve through the inlet port of the one-way valve 9, the outlet port of the one-way valve 9, the third port 83 of the cut-off switch and the first port 81 of the cut-off switch, so as to provide a gas pressure for the second port 12 of the relay valve. When the vehicle is braking, the pressure of the brake pipe 6 decreases, and the gas at the second port 12 of the relay valve cannot flow out, i.e. the pressure at the second port 12 of the relay valve remains unchanged.

[0098] ​When the switching device 4 is adjusted to the second gear, at this time, the switching device 4 drives the connecting rod connected with the cut-off switch 8, so that the cut-off switch 8 is opened, that is, the gas path between the first gas port 81 of the cut-off switch and the second gas port 82 of the cut-off switch is communicated, and when the vehicle is running, the gas in the brake pipe 6 can flow to the second gas port 12 of the relay valve through the second gas port 82 of the cut-off switch, the first gas port 81 of the cut-off switch in turn, and the gas in the brake pipe 6 can also be transmitted to the second gas port 12 of the relay valve through the gas inlet of the one-way valve 9, the gas outlet of the one-way valve 9, the third gas port 83 of the cut-off switch, the first gas port 81 of the cut-off switch in turn, and when the vehicle is braking, at this time, the pressure in the brake pipe 6 decreases, and the gas at the second gas port 12 of the relay valve flows to the brake pipe 6 through the first gas port 81 of the cut-off switch, the second gas port 82 of the cut-off switch in turn, so that the gas pressure at the second gas port 12 of the relay valve decreases with the decrease of the pressure in the brake pipe 6.

[0099] In addition, the first gas port 21 of the distribution valve is connected with the first gas port 11 of the relay valve, the second gas port 22 of the distribution valve is connected with the air cylinder 5, and the third gas port 23 of the distribution valve is connected with the brake pipe 6; when the vehicle is braking, the pressure in the brake pipe 6 decreases, and the pressure at the third gas port 23 of the distribution valve connected with the brake pipe 6 also decreases, at this time, the first gas port 21 of the distribution valve is opened, and since the air cylinder 5 is connected with the second gas port 22 of the distribution valve, the gas in the air cylinder 5 can flow to the first gas port 11 of the relay valve through the second gas port 22 of the distribution valve, the first gas port 21 of the distribution valve in turn.

[0100] In addition, the switching device 4 and the distribution valve 2 are connected by a connecting rod, when the switching device 4 is switched to the first gear, at this time, the switching device 4 drives the connecting rod to further enable the distribution valve 2 to output a pressure, that is, when the vehicle is braking, the gas in the air cylinder 5 flows to the first gas port 11 of the relay valve through the second gas port 22 of the distribution valve, the third gas port 23 of the distribution valve in turn, and when the switching device 4 is switched to the second gear, at this time, the switching device 4 drives the connecting rod to further enable the distribution valve 2 to output another pressure, that is, when the vehicle is braking, the gas in the air cylinder 5 flows to the first gas port 11 of the relay valve through the second gas port 22 of the distribution valve, the third gas port 23 of the distribution valve in turn.

[0101] In an example, the relay valve 1 includes a first valve body, a second valve body and a balance beam 17; the first valve body and the second valve body are located at two ends of the balance beam 17.

[0102] The third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve are located on the first valve body, and the second gas port 12 of the relay valve is located on the second valve body; the first valve body and the second valve body are communicated by a first communication pipe 161, and the first gas port 11 of the relay valve is located on the first communication pipe 161.

[0103] The second valve body is used to apply different pressure to the first valve body through the balance beam 17 when the first gas port 11 of the relay valve is input with gas of different pressure and the second gas port 12 of the relay valve is input with gas of different pressure, so as to cause the pressure of the flowing gas between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve to change.

[0104] In one example, the first valve body is provided with a pressure limiting valve 18 and a first control valve 191; the bottom end of the first control valve 191 is arranged on the first end of the balance beam 17, and the pressure limiting valve 18 is located on the top of the first control valve 191.

[0105] The distribution valve 2 is used to input gas of a first pressure to the first gas port 11 of the relay valve when the switching device 4 is located at a first gear of different gears; and input gas of a second pressure to the first gas port 11 of the relay valve when the switching device 4 is located at a second gear of different gears, the first pressure being greater than the second pressure.

[0106] The switch structure 3 is used to input gas of a first gas pressure to the second gas port 12 of the relay valve when the switching device 4 is located at a first gear of different gears; control the gas pressure at the second gas port 12 of the relay valve to be a second gas pressure when the switching device 4 is located at a second gear of different gears and the gas pressure of the brake pipe 6 is a third pressure, the second gas pressure being less than the first gas pressure; control the gas pressure at the second gas port 12 of the relay valve to be a third gas pressure when the switching device 4 is located at a second gear of different gears and the gas pressure of the brake pipe 6 is a fourth pressure, the third gas pressure being less than the second gas pressure, and the fourth pressure being less than the third pressure.

[0107] The second valve body is used to apply a first force to the first control valve 191 through the balance beam 17 based on the gas of the first pressure and the gas of the first gas pressure; apply a second force to the first control valve 191 through the balance beam 17 based on the gas of the second pressure and the gas of the second gas pressure, the second force being greater than the first force; and apply a third force to the first control valve 191 through the balance beam 17 based on the gas of the second pressure and the gas of the third pressure, the third force being greater than the second force.

[0108] The first control valve 191 is used to lift the pressure limiting valve 18 based on the first pressure to make the third port 13 of the relay valve and the fourth port 14 of the relay valve communicate, and the size of the cavity between the third port 13 of the relay valve and the fourth port 14 of the relay valve in the first valve body is the first size; lift the pressure limiting valve 18 based on the second pressure to make the third port 13 of the relay valve and the fourth port 14 of the relay valve communicate, and the size of the cavity between the third port 13 of the relay valve and the fourth port 14 of the relay valve in the first valve body is the second size, the second size is greater than the first size; lift the pressure limiting valve 18 based on the third pressure to make the third port 13 of the relay valve and the fourth port 14 of the relay valve communicate, and the size of the cavity between the third port 13 of the relay valve and the fourth port 14 of the relay valve in the first valve body is the third size, the third size is greater than the second size.

[0109] Exemplary, Figure 3 A structure schematic diagram of a relay valve provided by the embodiment of the application is shown in the figure, Figure 3 As shown in the figure, the relay valve 1 comprises a first valve body, a second valve body and a balance beam 17, the first valve body is located on one side of the balance beam 17, and the second valve body is located on the other side of the balance beam 17. The first valve body and the second valve body are communicated through a first communication pipe 161.

[0110] Among them, the third port 13 of the relay valve and the fourth port 14 of the relay valve are arranged on the first valve body, the second port 12 of the relay valve is arranged on the second valve body, and the first port 11 of the relay valve is arranged on the first communication pipe 161 between the first valve body and the second valve body.

[0111] When the vehicle brakes, the air cylinder 5 inputs different pressure gases to the first port 11 of the relay valve in the second valve body through the distribution valve 2, and inputs different pressure gases to the second port 12 of the relay valve in the second valve body due to the on-off of the cut-off switch 8 and the change of the brake pipe 6 pressure, under the joint action of the pressure of the two ports, different forces are applied to the first valve body through the balance beam 17, so that the air cylinder 5 inputs different pressure gases to the fourth port 14 of the relay valve through the third port 13 of the relay valve in the first valve body, so that different pressure gases are input into the brake cylinder 7 connected with the fourth port 14 of the relay valve.

[0112] And, the pressure limiting valve 18 and the first control valve 191 are arranged in the first valve body, the bottom end of the first control valve 191 is in contact with a section of the balance beam 17, and the first control valve 191 is located at the top of the balance beam 17.

[0113] When the conversion device 4 is in the first gear (i.e. the vehicle is in the national railway line), when the vehicle is in ordinary braking or emergency braking, the brake pipe 6 starts to drop the gas pressure under the action of the third control valve, since the brake pipe 6 is connected with the third gas port 23 of the distribution valve, therefore the pressure at the third gas port 23 of the distribution valve also decreases with the decrease of the pressure in the brake pipe 6, at this time the first gas port 21 of the distribution valve is opened, the gas in the air cylinder 5 can be input into the first pressure gas in the first gas port 11 of the relay valve through the second gas port 22 of the distribution valve and the first gas port 21 of the distribution valve in turn. In addition, when the conversion device 4 is in the first gear and before the vehicle is braked, the gas in the brake pipe 6 connected with the switch structure 3 can flow to the second gas port 12 of the relay valve connected with the switch structure 3 through the switch structure 3, so that the pressure thereof is the first air pressure, and the gas at the second gas port 12 of the relay valve cannot flow back to the brake pipe 6; when the vehicle is braked and the pressure of the gas in the brake pipe 6 decreases, the pressure at the second gas port 12 of the relay valve remains unchanged and is still the first air pressure; under the joint action of the gas based on the first pressure and the gas with the first air pressure, the second valve body applies the first force to the first control valve 191 in the first valve body through the balance beam 17, the first control valve 191 is lifted under the action of the first force to make the pressure limiting valve 18, so that the template originally between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve rises, and then the gas path between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve is communicated, and the size of the cavity between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve is the first size. At this time, since the air cylinder 5 is connected with the third gas port 13 of the relay valve, the gas in the air cylinder 5 flows to the fourth gas port 14 of the relay valve through the third gas port 13 of the relay valve, and then the brake cylinder 7 connected with the fourth gas port 14 of the relay valve is inflated, so that the brake cylinder 7 exerts the first force on the wheels, at this time under the action of the pressure at the fourth gas port 14 of the relay valve, the template provided on the first control valve 191 is pressed down, and then the pressure limiting valve 18 at the upper end of the first control valve 191 also moves downward, so that the gas path between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve is closed, and the inflation process of the brake cylinder 7 is ended.

[0114] When the switching device 4 is in the second gear (i.e. the vehicle is in the subway line), when the vehicle brakes, the pressure of the brake pipe 6 starts to drop under the action of the third control valve, when the vehicle ordinary brakes, the air pressure in the brake pipe 6 is reduced to the third pressure, because the brake pipe 6 is connected with the third air port 23 of the distribution valve, so the pressure at the third air port 23 of the distribution valve also decreases with the decrease of the pressure in the brake pipe 6, at this time the first air port 21 of the distribution valve is opened, the air in the air cylinder 5 can be input to the first air port 11 of the relay valve through the second air port 22 of the distribution valve and the first air port 21 of the distribution valve in turn, and the second pressure is greater than the first pressure. In addition, when the switching device 4 is in the second gear and before the vehicle brakes, the air in the brake pipe 6 connected with the switching structure 3 can flow to the second air port 12 of the relay valve connected with the switching structure 3 through the switching structure 3, and the air at the second air port 12 of the relay valve can flow back to the brake pipe 6 through the switching structure 3; when the vehicle brakes and the air pressure in the brake pipe 6 decreases, the air at the second air port 12 of the relay valve flows out to the brake pipe 6 through the switching structure 3 connected therewith, so that the air pressure at the second air port 12 of the relay valve changes to the second air pressure, wherein the second air pressure is less than the first air pressure; under the joint action of the air based on the second pressure and the air based on the second air pressure, the second valve body presses down one end of the balance beam, and applies the second force to the first control valve 191 in the first valve body through the lever action of the balance beam 17, wherein the second force is greater than the first force; the first control valve 191 is lifted under the action of the second force, so that the template originally between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve rises, and then the air path between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve is communicated, and the size of the cavity between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve is the second size, wherein the second size is greater than the first size. At this time, because the air cylinder 5 is connected with the third air port 13 of the relay valve, the air in the air cylinder 5 can flow to the fourth air port 14 of the relay valve through the third air port 13 of the relay valve, and then the brake cylinder 7 connected with the fourth air port 14 of the relay valve is inflated, so that the brake cylinder 7 exerts the second force on the wheels, wherein the second force is greater than the first force. At this time, under the action of the pressure at the fourth air port 14 of the relay valve, the template provided on the first control valve 191 is pressed down, and then the pressure limiting valve 18 at the upper end of the first control valve 191 also moves downward, so that the air path between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve is closed, and the inflation process of the brake cylinder 7 ends.

[0115] When the switching device 4 is in the second gear, and the vehicle is braking, the pressure of the brake pipe 6 starts to decrease under the action of the third control valve, when the vehicle is emergency braking, the air pressure in the brake pipe 6 decreases to the fourth pressure (at this time the fourth pressure is 0), wherein the fourth pressure is less than the third pressure; since the brake pipe 6 is connected with the third air port 23 of the distribution valve, therefore the pressure at the third air port 23 of the distribution valve also decreases with the decrease of the pressure in the brake pipe 6, at this time the first air port 21 of the distribution valve is opened, the air in the air cylinder 5 can flow to the first air port 11 of the relay valve through the second air port 22 of the distribution valve and the first air port 21 of the distribution valve in turn, and input the air with the second pressure to the first air port 11 of the relay valve, wherein the second pressure is greater than the first pressure. In addition, when the switching device 4 is in the second gear, before the vehicle is braking, the air in the brake pipe 6 connected with the switching structure 3 can flow to the second air port 12 of the relay valve connected with the switching structure 3 through the switching structure 3, and the air at the second air port 12 of the relay valve can flow back to the brake pipe 6 through the switching structure 3; when the vehicle is braking, the air pressure in the brake pipe 6 decreases to the fourth pressure, the air at the second air port 12 of the relay valve flows out to the brake pipe 6 through the switching structure 3 connected therewith, so that the air pressure at the second air port 12 of the relay valve changes to the third pressure, wherein the third pressure is less than the second pressure; under the joint action of the air with the second pressure and the air with the third pressure, the second valve body presses down one end of the balance beam, and applies the third force to the first control valve 191 in the first valve body through the lever action of the balance beam 17, wherein the third force is greater than the second force; the first control valve 191 is lifted under the action of the third force, so that the diaphragm originally between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve is lifted, thereby the air path between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve is communicated, and the size of the cavity between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve is the third size, wherein the third size is greater than the second size. At this time, since the air cylinder 5 is connected with the third air port 13 of the relay valve, therefore the air in the air cylinder 5 can flow to the fourth air port 14 of the relay valve through the third air port 13 of the relay valve, thereby the brake cylinder 7 connected with the fourth air port 14 of the relay valve is inflated, so that the brake cylinder 7 exerts the third force on the wheels, wherein the third force is greater than the second force. At this time, under the action of the pressure at the fourth air port 14 of the relay valve, the diaphragm arranged on the first control valve 191 is pressed down, and the pressure limiting valve 18 at the upper end of the first control valve 191 also moves downward, thereby the air path between the third air port 13 of the relay valve and the fourth air port 14 of the relay valve is closed, and the inflation process of the brake cylinder 7 is ended.

[0116] In an example, the second valve body is provided with a first cavity and a second cavity; the second port 12 of the relay valve is located on the first cavity, and the first cavity is provided with a first piston 101, and the first cavity is provided with a first port which is in communication with the atmosphere;

[0117] The second cavity is provided with an upper die plate 102, a lower die plate 103 and a second control valve 192; the lower die plate 103 is arranged on the second control valve 192, and the upper die plate 102 is located at the top end of the second control valve 192; the lower end of the second cavity is provided with a second port which is in communication with the atmosphere; and the bottom end of the second control valve 192 is arranged on the second end of the balance beam 17;

[0118] The first cavity and the second cavity are connected by a second communication pipe 162 and a third communication pipe 163; the first communication pipe 161 and the second communication pipe 162 are in communication, one end of the third communication pipe 163 is adjacent to the first port, and the other end of the third communication pipe 163 is located between the upper die plate 102 and the lower die plate 103;

[0119] The first piston 101 is used to make the gas based on the first pressure and the gas based on the first air pressure not move, so that the gas at the lower end of the upper die plate 102 is in communication with the atmosphere through the third communication pipe 163 and the first port, and the upper die plate 102 applies a first force to the second control valve 192; the gas based on the second pressure and the gas based on the second air pressure do not move, so that the upper die plate 102 applies a second force to the second control valve 192, and the second force is greater than the first force; the gas based on the second pressure and the gas based on the third air pressure move, so that the second communication pipe 162 is in communication with the third communication pipe 163, and the lower die plate 103 applies a third force to the second control valve 192, and the third force is greater than the second force;

[0120] The second control valve 192 is used to apply a first force to the first control valve 191 through the balance beam 17 based on the first force; apply a second force to the first control valve 191 through the balance beam 17 based on the second force; and apply a third force to the first control valve 191 through the balance beam 17 based on the third force.

[0121] In an example, the second valve body of the relay valve 1 contains a first cavity and a second cavity, and in the first cavity, the second port 12 of the relay valve and the first piston 101 are included. The first piston 101 is also provided with a first port which is in communication with the atmosphere, so that the piston can be in communication with the atmosphere through the first port.

[0122] In the second cavity, there are an upper die plate 102, a lower die plate 103 and a second control valve 192. The bottom end of the second control valve 192 is in contact with the other end of the balance beam 17. The upper die plate 102 is located at the top end of the second control valve 192. The lower die plate 103 is arranged on the second control valve 192. In addition, the lower end of the second cavity is provided with a second port which is open to the atmosphere, so that the lower surface of the lower die plate 103 is in communication with the atmosphere.

[0123] In addition, the first cavity and the second cavity are in communication through the second communication pipe 162 and the third communication pipe 163. One end of the third communication pipe 163 is adjacent to the first port on the first cavity. The other end of the third communication pipe 163 is between the upper die plate 102 and the lower die plate 103.

[0124] When the switching device 4 is in the first gear (i.e. the vehicle is in the national railway line), when the vehicle is normally braked or emergency braked, the pressure of the brake pipe 6 starts to drop under the action of the third control valve, and the gas pressure in the brake pipe 6 starts to drop, and since the brake pipe 6 is connected with the third gas port 23 of the distribution valve, the pressure at the third gas port 23 of the distribution valve also decreases with the decrease of the pressure in the brake pipe 6, at this time the first gas port 21 of the distribution valve is opened, and the gas in the air cylinder 5 can be input into the first gas port 11 of the relay valve through the second gas port 22 of the distribution valve and the first gas port 21 of the distribution valve in turn to input the gas with the first pressure. In addition, when the switching device 4 is in the first gear and before the vehicle is braked, the gas in the brake pipe 6 connected with the switching structure 3 can flow to the second gas port 12 of the relay valve connected with the switching structure 3 through the switching structure 3 to make the pressure at the second gas port 12 of the relay valve be the first air pressure, and the gas at the second gas port 12 of the relay valve cannot flow back to the brake pipe 6; when the vehicle is braked and the pressure of the gas in the brake pipe 6 decreases, the pressure at the second gas port 12 of the relay valve remains unchanged and is still the first air pressure; in the second valve body, since the second gas port 12 of the relay valve is communicated with the first piston 101, and the pressure at the second gas port 12 of the relay valve remains unchanged, the first piston 101 is acted on by the first air pressure to make the gas at the lower end of the upper die plate 102 communicated to the atmosphere through the third communication pipe 163 and the first port, and the upper end of the upper die plate 102 is communicated with the first gas port 11 of the relay valve through the first communication pipe 161, so the pressure at the upper end of the upper die plate 102 is the first pressure, at this time the pressure at the upper end of the upper die plate 102 is different from the pressure at the lower end of the upper die plate 102; the gas at the upper end of the lower die plate 103 is communicated to the atmosphere through the third communication pipe 163 and the first port, and the gas at the lower end of the lower die plate 103 is communicated to the atmosphere through the second port of the second cavity, at this time the pressure at the upper end of the lower die plate 103 is the same as the pressure at the lower end of the lower die plate 103, therefore, in the second cavity, since the pressure at the upper end of the upper die plate 102 is greater than the pressure at the lower end of the upper die plate 102, the upper die plate 102 exerts the first force on the second control valve 192 to press down one end of the balance beam 17, and exerts the first force on the first control valve 191 in the first valve body through the lever action of the balance beam 17, the first control valve 191 is lifted under the action of the first force to make the pressure limiting valve 18, which is originally between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve, rise, thereby the gas path between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve is communicated, and the size of the cavity between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve is the first size. At this time, since the air cylinder 5 is connected with the third gas port 13 of the relay valve, the gas in the air cylinder 5 flows to the fourth gas port 14 of the relay valve through the third gas port 13 of the relay valve, thereby making the brake cylinder 7 connected with the fourth gas port 14 of the relay valve be inflated, and making the brake cylinder 7 exert the first force on the wheels.At this time, under the action of the pressure at the fourth port 14 of the relay valve, the template provided on the first control valve 191 is pressed down, and then the pressure limiting valve 18 at the upper end of the first control valve 191 is also moved downward, so that the air passage between the third port 13 of the relay valve and the fourth port 14 of the relay valve is closed, and the inflation process of the brake cylinder 7 is ended.

[0125] When the switching device 4 is in the second gear (i.e. the vehicle is on the subway line), when the vehicle brakes, the pressure of the brake pipe 6 is under the action of the third control valve, the gas pressure in the brake pipe 6 begins to drop, when the vehicle ordinary brake, the air pressure in the brake pipe 6 is reduced to the third pressure, because the brake pipe 6 is connected with the third gas port 23 of the distribution valve, so the pressure at the third gas port 23 of the distribution valve also decreases with the decrease of the pressure in the brake pipe 6, at this time the first gas port 21 of the distribution valve is opened, the gas in the air cylinder 5 can input the gas of the second pressure to the first gas port 11 of the relay valve through the second gas port 22 of the distribution valve and the first gas port 21 of the distribution valve in turn, wherein the second pressure is greater than the first pressure. In addition, when the switching device 4 is in the second gear, and before the vehicle brakes, the gas in the brake pipe 6 connected with the switching structure 3 can flow to the second gas port 12 of the relay valve connected with the switching structure 3 through the switching structure 3, so that the first piston 101 connected with the second gas port 12 of the relay valve moves to the left.When the vehicle brakes, the gas pressure in the brake pipe 6 decreases, the gas at the second gas port 12 of the relay valve flows out to the brake pipe 6 through the switch structure 3 connected thereto, so that the gas pressure at the second gas port 12 of the relay valve decreases to a second gas pressure, wherein the second gas pressure is less than the first gas pressure; in the second valve body, since the second gas port 12 of the relay valve is in communication with the first piston 101, and the pressure at the second gas port 12 of the relay valve decreases to the second gas pressure as the pressure of the brake pipe 6 connected thereto through the switch device decreases, at this time, the pressure at the first piston 101 in communication with the second gas port 12 of the relay valve also decreases to the second gas pressure, but the decrease in pressure at the first piston 101 is not enough to move the first piston 101, so at this time, the first piston 101 is acted on by the second gas pressure, so that the gas at the lower end of the upper die plate 102 flows to the atmosphere through the third communication pipe 163 and the first port, and the upper end of the upper die plate 102 is in communication with the first gas port 11 of the relay valve through the first communication pipe 161, so the gas pressure at the upper end of the upper die plate 102 is the same as the pressure at the first gas port 11 of the relay valve, at this time, the pressure at the upper end of the upper die plate 102 is different from the pressure at the lower end of the upper die plate 102; and the gas at the upper end of the lower die plate 103 flows to the atmosphere through the third communication pipe 163 and the first port, and the gas at the lower end of the lower die plate 103 flows to the atmosphere through the second port of the second cavity, at this time, the pressure at the upper end of the lower die plate 103 is the same as the pressure at the lower end of the lower die plate 103, so in the second cavity, since the second pressure at the upper end of the upper die plate 102 is greater than the pressure at the lower end of the upper die plate 102, the upper die plate 102 exerts a second force on the second control valve 192 under the action of the second pressure, since the second pressure is greater than the first pressure, the second force is greater than the first force; and the second control valve 192 presses down one end of the balance beam, and exerts a second force on the first control valve 191 in the first valve body through the lever action of the balance beam 17, wherein the second force is greater than the first force; the first control valve 191 lifts the pressure limiting valve 18 under the action of the second force, so that the die plate originally between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve rises, thereby the gas path between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve is communicated, and the size of the cavity between the third gas port 13 of the relay valve and the fourth gas port 14 of the relay valve is a second size, wherein the second size is greater than the first size. At this time, since the air cylinder 5 is connected to the third gas port 13 of the relay valve, the gas in the air cylinder 5 can flow to the fourth gas port 14 of the relay valve through the third gas port 13 of the relay valve, thereby inflating the brake cylinder 7 connected to the fourth gas port 14 of the relay valve, so that the brake cylinder 7 exerts a second force on the wheels, wherein the second force is greater than the first force, thereby making the commonly used braking speed of the vehicle on the subway line greater than the braking speed of the vehicle on the national railway line.At this time, under the action of the pressure at the fourth port 14 of the relay valve, the template provided on the first control valve 191 is pressed down, and then the pressure limiting valve 18 at the upper end of the first control valve 191 is also moved downward, so that the air passage between the third port 13 of the relay valve and the fourth port 14 of the relay valve is closed, and the inflation process of the brake cylinder 7 is ended.

[0126] When the switching device 4 is in the second gear, and the vehicle is braking, the pressure in the brake pipe 6 starts to decrease under the action of the third control valve, and when the vehicle is emergency braking, the pressure in the brake pipe 6 decreases to a fourth pressure, wherein the fourth pressure is less than the third pressure; since the brake pipe 6 is connected to the third port 23 of the distribution valve, the pressure at the third port 23 of the distribution valve also decreases with the decrease of the pressure in the brake pipe 6, at this time the first port 21 of the distribution valve is opened, and the gas in the air cylinder 5 can be input to the first port 11 of the relay valve through the second port 22 of the distribution valve and the first port 21 of the distribution valve, and the second pressure of the gas is greater than the first pressure. In addition, when the switching device 4 is in the second gear, and before the vehicle is braking, the gas in the brake pipe 6 connected to the switching structure 3 can flow to the second port 12 of the relay valve connected to the switching structure 3 through the switching structure 3, so that the first piston 101 connected to the second port 12 of the relay valve moves to the left; when the vehicle is braking, and the pressure of the gas in the brake pipe 6 decreases to the fourth pressure, the gas at the second port 12 of the relay valve will flow out to the brake pipe 6 through the switching structure 3 connected thereto, so that the pressure of the gas at the second port 12 of the relay valve changes to the third pressure, wherein the third pressure is less than the second pressure; in the second valve body, since the second port 12 of the relay valve is in communication with the first piston 101, and the pressure at the second port 12 of the relay valve decreases to the third pressure with the decrease of the pressure in the brake pipe 6 connected to the switching device, at this time the pressure at the first piston 101 connected to the second port 12 of the relay valve also decreases to the third pressure, and the first piston 101 moves to the right, and the first piston 101 moves to the third communication pipe 163 between the first port and one end of the third communication pipe 163, at this time the gas passages between the first communication pipe 161, the second communication pipe 162 and the third communication pipe 163 are in communication, and since the first port 11 of the relay valve connected to the first communication pipe 161 is in communication, the pressures in the first communication pipe 161, the second communication pipe 162 and the third communication pipe 163 are all the second pressure, that is, at this time the upper end of the upper die plate 102 and the lower end of the upper die plate 102 are in communication through the second communication pipe 162 and the third communication pipe 163, and the pressures at the upper end of the upper die plate 102 and the lower end of the upper die plate 102 are both the second pressure; in addition, since the upper end of the lower die plate 103 is in communication with the lower end of the upper die plate 102, the pressure at the upper end of the lower die plate 103 is also the second pressure, and the lower end of the lower die plate 103 is in communication with the atmosphere through the second port, so that the pressure at the upper end of the lower die plate 103 is greater than the pressure at the lower end of the lower die plate 103, and the lower die plate 103 exerts a third force on the second control valve 192, and since the surface area of the lower die plate 103 is greater than the surface area of the upper die plate 102, the third force is greater than the second force.And the second control valve 192, the lower balance beam one end, through the lever action of the balance beam 17 to the first control valve 191 in the first valve body to apply the third force, wherein the third force is greater than the second force; the first control valve 191 under the action of the third force to lift the pressure limiting valve 18, so that the original template between the third port 13 of the relay valve and the fourth port 14 of the relay valve rises, in turn, the third port 13 of the relay valve and the fourth port 14 of the relay valve between the gas path is communicated, and the size of the cavity between the third port 13 of the relay valve and the fourth port 14 of the relay valve is the third size, wherein the third size is greater than the second size. At this time, because the air cylinder 5 is connected with the third port 13 of the relay valve, so the gas in the air cylinder 5 can flow to the fourth port 14 of the relay valve through the third port 13 of the relay valve, and then make the brake cylinder 7 connected with the fourth port 14 of the relay valve inflation, so that the brake cylinder 7 on the wheel exerts the third force, wherein the third force is greater than the second force, so that the speed of the vehicle emergency braking on the subway is greater than the speed of the vehicle on the subway commonly used brake. At this time, under the action of the pressure at the fourth port 14 of the relay valve, the template is pressed down on the first control valve 191, and then the pressure limiting valve 18 at the upper end of the first control valve 191 also moves down, and then the gas path between the third port 13 of the relay valve and the fourth port 14 of the relay valve is closed, and the inflation process of the brake cylinder 7 is ended.

[0127] In one example, the relay valve 1 further comprises a support point for supporting the balance beam 17, and a second piston; the support point is connected with one end of the second piston, and the other end 15 of the second piston is connected with the empty and heavy vehicle adjusting device.

[0128] Exemplarily, the lower end of the balance beam 17 of the relay valve 1 is further provided with a movable support point and a second piston. One end of the second piston is connected with the support point, and the other end 15 of the second piston can be connected with the empty and heavy vehicle adjusting device (for example, a weighing valve).

[0129] In order to ensure that the vehicle has the same deceleration when the vehicle is under different loads, the air load adjustment device can be connected to the other end 15 of the second piston of the relay valve 1, when the load of the vehicle increases, in order to ensure that the vehicle has the same deceleration when braking on the same line, the brake cylinder 7 needs to provide more force to the wheels, at this time the air load adjustment device will push the second piston to move to the left due to the increase of the load of the vehicle, further moving the support point connected to the one end of the second piston to the left. When the vehicle is braking, the distance between the bottom end of the second control valve 192 and the support point becomes longer, at this time if the second control valve 192 applies a first force to the one end of the support beam, due to the increase of the distance between the bottom end of the second control valve 192 and the support point, the fourth force applied by the support beam to the first control valve 191 is greater than the original first force, further making the third port 13 of the relay valve communicate with the fourth port 14 of the relay valve, the size of the cavity between the third port 13 of the relay valve and the fourth port 14 of the relay valve is the fourth size, wherein the fourth size is greater than the first size, so that more gas in the air cylinder 5 connected to the third port 13 of the relay valve can flow to the brake cylinder 7 through the third port 13 of the relay valve, the fourth port 14 of the relay valve and the brake cylinder 7 in turn, and the brake cylinder 7 applies a fourth force to the wheels, wherein the fourth force is greater than the first force, so as to ensure that the vehicle has the same deceleration when braking on the same line when the load of the vehicle increases.

[0130] In the embodiment, a brake control system of a vehicle is provided, and the brake system comprises a switching device 4. By adjusting the gear of the switching device 4, different pressures can be output by the distribution valve 2 connected to the switching device 4, so as to affect the pressure at the first port 11 of the relay valve connected to the third port 23 of the distribution valve; meanwhile, the switching device 4 can also control the opening and closing of the cut-off switch 8 connected to the switching device 4, so as to further affect the pressure at the second port 12 of the relay valve connected to the first port 81 of the cut-off switch, so that the piston at the second port 12 of the relay valve is in different positions, and the upper surface and the lower surface of the upper die plate 102 and the lower die plate 103 in the second cavity are subjected to different air pressures, so that the upper die plate 102 or the lower die plate 103 drives the second control valve 192 to exert different forces on the first control valve 191 through the support beam, and the first control valve 191 exerts different forces on the pressure limiting valve 18 on the first control valve 191 under the action of different forces, so that the third port 13 of the relay valve is in communication with the fourth port 14 of the relay valve, and the air cylinder 5 can input different air pressures to the brake cylinder 7 through the third port 13 of the relay valve and the fourth port 14 of the relay valve, so that the brake cylinder 7 exerts different forces on the wheels, so that the vehicle can meet the braking requirements of different lines. In addition, the air weight adjustment device can also be connected to the other end 15 of the second piston of the relay valve 1, so that when the vehicle runs on the same line with increased load, the same deceleration can be achieved, so as to ensure the safety of the connection device of the vehicle. In addition, the brake control system of the vehicle provided in the embodiment does not need to be controlled by power supply, and can meet the needs of vehicles without power supply, and can reduce the power consumption cost of the vehicle. In addition, the installation of two different brake control systems in the vehicle is avoided, and the manufacturing cost and maintenance cost of the vehicle are reduced. In addition, the brake control system can also be connected to multiple relay valves 1 and multiple brake cylinders 7.

[0131] In the embodiment, a vehicle is provided, and the vehicle is provided with the brake control system provided in any of the above embodiments.

[0132] In one example, the vehicle is further provided with the air cylinder 5 and the brake pipe 6; the brake pipe 6 is connected to the air cylinder 5 through the distribution valve 2;

[0133] The brake pipe 6 is used for charging the air cylinder 5 with air.

[0134] In one example, the vehicle is further provided with the air cylinder 5, the brake pipe 6 and the main air pipe; the main air pipe is connected to the air cylinder 5; and the main air pipe is used for charging the air cylinder 5 with air.

[0135] Exemplarily, before the vehicle brakes, the air cylinder 5 needs to be filled with air. In one possible way, the air in the air cylinder 5 can come from the brake pipe 6. On the basis of the above-mentioned embodiment structure, when the vehicle is running, at this time, the first air port 21 of the distribution valve is closed, the second air port 22 of the distribution valve is open, and the third air port 23 of the distribution valve is open, the air in the brake pipe 6 can flow to the second air port 22 of the distribution valve through the third air port 23 of the distribution valve connected thereto, and further flow to the air cylinder 5 connected thereto through the second air port 22 of the distribution valve, so as to fill the air cylinder 5 with air.

[0136] In another possible way, the air in the air cylinder 5 can also come from the main air pipe. On the basis of the above-mentioned embodiment structure, the vehicle has a main air pipe, the main air pipe can be connected to one end of the pressure reducing valve, and the other end of the pressure reducing valve is connected to the air. When the vehicle is running, the pressure reducing valve can be artificially controlled to communicate among the main air pipe, the pressure reducing valve and the air cylinder 5, so that the main air pipe can fill the air cylinder 5 with air.

[0137] The embodiment of the present application also provides a train, which comprises a locomotive and the vehicle provided in the above-mentioned embodiment, and the locomotive is used to provide power to the vehicle.

[0138] When used in the present application, although the terms "first", "second" and the like can be used in the present application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element can be called a second element, and similarly, a second element can be called a first element, as long as all occurrences of "first element" are consistently renamed and all occurrences of "second element" are consistently renamed. The first element and the second element are both elements, but can not be the same element.

[0139] The above technical description can refer to the accompanying drawings, which form a part of the present application, and the implementation according to the described embodiments is shown in the drawings by description. Although these embodiments are described in sufficient detail to enable those skilled in the art to implement these embodiments, these embodiments are non-limiting; thus, other embodiments can be used, and changes can also be made without departing from the scope of the described embodiments. For example, the order of the operations described in the flowchart is non-limiting, and thus the order of two or more operations illustrated in the flowchart and described according to the flowchart can be changed according to several embodiments. As another example, one or more operations illustrated in the flowchart and described according to the flowchart are optional, or can be deleted, in several embodiments. In addition, certain steps or functions can be added to the disclosed embodiments, or the order of two or more steps is replaced. All these changes are considered to be included in the disclosed embodiments and claims.

[0140] Furthermore, terminology is used in the above technical description to provide a thorough understanding of the described embodiments. However, excessive detail is not required to implement the described embodiments. Therefore, the above description of the embodiments is presented for illustrative and descriptive purposes. The embodiments presented in the above description, as well as the examples disclosed according to these embodiments, are provided separately to add context and aid in understanding the described embodiments. The above specification is not intended to be exhaustive or to limit the described embodiments to the precise form of this application. Based on the above teachings, several modifications, selections, and variations are possible. In some cases, well-known processing steps have not been described in detail to avoid unnecessarily affecting the described embodiments.

[0141] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

[0142] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A brake control system of a vehicle, characterized by, The system comprises a relay valve, a distribution valve, a switch structure and a conversion device; wherein the first gas port of the relay valve is connected with the air cylinder through the distribution valve, the second gas port of the relay valve is connected with the brake pipe through the switch structure; the third gas port of the relay valve is connected with the air cylinder, and the fourth gas port of the relay valve is connected with the brake cylinder; the conversion device is connected with the distribution valve; the conversion device is connected with the switch structure; The air cylinder is used for inputting gas to the distribution valve and the third gas port of the relay valve when the brake pipe is exhausted; The brake pipe is used for exhausting gas to the switch structure; The conversion device is used for controlling the distribution valve to output gas with different pressures to the first gas port of the relay valve when the conversion device is located at different gears, and controlling the switch structure to output gas with different pressures to the second gas port of the relay valve when the conversion device is located at different gears; The relay valve is used for controlling the pressure of the flowing gas between the third gas port of the relay valve and the fourth gas port of the relay valve according to the gas with different pressures from the first gas port of the relay valve and the gas with different pressures from the second gas port of the relay valve, so as to input gas with different pressures to the brake cylinder; The switch structure comprises a cut-off switch and a one-way valve; the first gas port of the cut-off switch is connected with the second gas port of the relay valve, and the second gas port of the cut-off switch is connected with the brake pipe; the gas outlet of the one-way valve is connected with the third gas port of the cut-off switch, and the gas inlet of the one-way valve is connected with the brake pipe; the conversion device is connected with the cut-off switch; the first gas port of the cut-off switch is adjacent to the third gas port of the cut-off switch; The conversion device is specifically used for controlling the cut-off switch to be opened or closed when the conversion device is located at different gears, so that the brake pipe outputs gas with different pressures to the second gas port of the relay valve through the switch structure.

2. The system of claim 1, wherein, The conversion device is specifically used for controlling the cut-off switch to be closed when the conversion device is located at the first gear of the different gears, and controlling the cut-off switch to be opened when the conversion device is located at the second gear of the different gears.

3. The system of claim 1, wherein, The relay valve comprises a first valve body, a second valve body and a balance beam; the first valve body and the second valve body are located at two ends of the balance beam; The third gas port of the relay valve and the fourth gas port of the relay valve are located on the first valve body, and the second gas port of the relay valve is located on the second valve body; the first valve body and the second valve body are communicated through a first communication pipe, and the first gas port of the relay valve is located on the first communication pipe; The second valve body is used for applying different pressures to the first valve body through the balance beam when the first gas port of the relay valve is inputted with gas with different pressures and the second gas port of the relay valve is inputted with gas with different pressures, so that the pressure of the flowing gas between the third gas port of the relay valve and the fourth gas port of the relay valve changes.

4. The system of claim 3, wherein, The first valve body is provided with a pressure limiting valve and a first control valve; the bottom end of the first control valve is arranged on the first end of the balance beam, and the pressure limiting valve is located on the top of the first control valve; The distribution valve is used for inputting gas with a first pressure to the first gas port of the relay valve when the conversion device is located at the first gear of the different gears, and inputting gas with a second pressure to the first gas port of the relay valve when the conversion device is located at the second gear of the different gears, the first pressure being greater than the second pressure; The switch structure is used for inputting gas with a first air pressure to the second gas port of the relay valve when the conversion device is located at the first gear of the different gears, and controlling the air pressure at the second gas port of the relay valve to be a second air pressure when the conversion device is located at the second gear of the different gears and the air pressure of the brake pipe is a third pressure, the second air pressure being less than the first air pressure; The switch structure is used for inputting gas with a first air pressure to the second gas port of the relay valve when the conversion device is located at the first gear of the different gears, and controlling the air pressure at the second gas port of the relay valve to be a second air pressure when the conversion device is located at the second gear of the different gears and the air pressure of the brake pipe is a third pressure, the second air pressure being less than the first air pressure; The second valve body is used for applying a first force to the first control valve through the balance beam based on the gas with the first pressure and the gas with the first air pressure, applying a second force to the first control valve through the balance beam based on the gas with the second pressure and the gas with the second air pressure, the second force being greater than the first force, and applying a third force to the first control valve through the balance beam based on the gas with the second pressure and the gas with the third air pressure, the third force being greater than the second force; The first control valve is used for lifting the pressure limiting valve based on the first pressure, so that the third gas port of the relay valve and the fourth gas port of the relay valve are communicated, and the size of the cavity in the first valve body between the third gas port of the relay valve and the fourth gas port of the relay valve is a first size, lifting the pressure limiting valve based on the second pressure, so that the third gas port of the relay valve and the fourth gas port of the relay valve are communicated, and the size of the cavity in the first valve body between the third gas port of the relay valve and the fourth gas port of the relay valve is a second size, the second size being greater than the first size, and lifting the pressure limiting valve based on the third pressure, so that the third gas port of the relay valve and the fourth gas port of the relay valve are communicated, and the size of the cavity in the first valve body between the third gas port of the relay valve and the fourth gas port of the relay valve is a third size, the third size being greater than the second size.

5. The system of claim 4, wherein, The second valve body is provided with a first cavity and a second cavity; the second gas port of the relay valve is located on the first cavity, the first cavity is provided with a first piston, and the first cavity is provided with a first port which is communicated with the atmosphere. The second cavity is provided with an upper die plate, a lower die plate and a second control valve; the lower die plate is arranged on the second control valve, and the upper die plate is located at the top end of the second control valve; the lower end of the second cavity is provided with a second port which is communicated with the atmosphere; the bottom end of the second control valve is arranged on the second end of the balance beam; The first cavity and the second cavity are connected with a second communication pipe and a third communication pipe; the first communication pipe and the second communication pipe are communicated, one end of the third communication pipe is adjacent to the first port, and the other end of the third communication pipe is located between the upper die plate and the lower die plate; The first piston is used for not moving the gas based on the first pressure and the gas based on the first air pressure, so that the gas at the lower end of the upper die plate is communicated with the atmosphere through the third communication pipe and the first port, and the upper die plate applies a first force to the second control valve; the gas based on the second pressure and the gas based on the second air pressure are not moved, so that the upper die plate applies a second force to the second control valve, and the second force is greater than the first force; The gas based on the second pressure and the gas based on the third air pressure are moved, so that the second communication pipe and the third communication pipe are communicated, and the lower die plate applies a third force to the second control valve, and the third force is greater than the second force; The second control valve is used for applying the first force to the first control valve through the balance beam based on the first force, applying the second force to the first control valve through the balance beam based on the second force, and applying the third force to the first control valve through the balance beam based on the third force.

6. The system of claim 3, wherein, The relay valve further comprises a support point for supporting the balance beam and a second piston; one end of the support point is connected with the second piston, and the other end of the second piston is connected with the empty and heavy vehicle adjusting device.

7. The system according to any of claims 1-6, characterized in that, The first air port of the distribution valve is connected with the first air port of the relay valve, the second air port of the distribution valve is connected with the air cylinder, and the third air port of the distribution valve is connected with the brake pipe; The distribution valve is specifically used for inputting the gas with the first pressure to the first air port of the relay valve through the first air port of the distribution valve according to the output gas of the air cylinder when the switching device is located at the first gear of the different gears, and inputting the gas with the second pressure to the first air port of the relay valve through the first air port of the distribution valve according to the output gas of the air cylinder when the switching device is located at the second gear of the different gears.

8. A vehicle characterized by comprising: The vehicle is provided with the brake control system according to any one of claims 1-7.

9. The vehicle of claim 8, wherein, The vehicle is further provided with an air cylinder and a brake pipe; the brake pipe is connected with the air cylinder through the distribution valve; The brake pipe is used for charging the air cylinder.

10. The vehicle of claim 8, wherein, The vehicle is further provided with an air cylinder, a brake pipe and a main air pipe; the main air pipe is connected with the air cylinder; The main air pipe is used for charging the air cylinder.

11. A train characterized by The train comprises a locomotive and the vehicle according to any one of claims 8-10; the locomotive is used for providing power for the vehicle.

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