A tractor trailer coordinated braking system for air over hydraulic trailer parking brake

Abstract

The application provides a trailer air brake parking brake master trailer coordinated brake system, and belongs to the technical field of master trailer coordinated brake. An air inlet of a master vehicle relay valve is connected with a parking loop air source, a control port of the master vehicle relay valve is connected with a master vehicle hand valve, and an air outlet of the master vehicle relay valve is connected with a trailer valve. An air outlet of the trailer valve is connected with a double pipeline device inflation-red and a double pipeline device brake-yellow respectively. An air inlet of an emergency relay valve is connected with the double pipeline device inflation-red and a trailer air cylinder respectively, a control port of the emergency relay valve is connected with the double pipeline device brake-yellow, and an air outlet of the emergency relay valve is connected with a control port of a trailer AEBS electromagnetic valve. An air inlet of the trailer AEBS electromagnetic valve is connected with the trailer air cylinder. An air outlet of the trailer AEBS electromagnetic valve is connected with a brake chamber of a diaphragm brake air chamber and a spring double-cavity brake air chamber. The system can prevent wheel lock during braking and ensure controllable direction.

Description

Technical Field

[0001] This invention belongs to the field of master-trailer coordinated braking technology, and particularly relates to a master-trailer coordinated braking system for a trailer air-stop parking brake. Background Technology

[0002] With the development of the commercial vehicle industry, the number of countries involved in the export of tractor units is increasing, and user needs are becoming more diverse. The braking system principles of both the tractor unit and the trailer need to be modified accordingly to adapt to different requirements.

[0003] For example, current parking brake methods for trailers, such as CN201620977863.9, disclose a semi-trailer with an air-cut brake. This document includes a semi-trailer, in which the cab is equipped with a foot pedal and an air compressor. The lower end of the foot pedal is fixedly connected to a brake valve via a connecting rod. The port of the brake valve is connected to a first control air connector via a flange. The port of the first control air connector is connected to a control pipeline via a flange. The port of the control pipeline is connected to an emergency relay valve via a flange. The port of the emergency relay valve is connected to a brake air chamber via a flange. The outlet of the emergency relay valve is connected to an air reservoir via a flange. The outlet of the air reservoir is connected to a manual valve via a pipe.

[0004] This method can lead to insufficient parking braking force and trailer braking only on slopes when the tractor is towing heavy and bulky goods, which can significantly affect the safety and stability of vehicle transportation. Summary of the Invention

[0005] This invention provides a trailer-mounted air-operated parking brake coordinated braking system that can prevent wheel lock-up during braking and ensure directional controllability.

[0006] The trailer air-stop parking brake master-trailer coordinated braking system includes: master vehicle relay valve, trailer valve, dual-line device inflation-red, dual-line device braking-yellow, emergency relay valve, trailer air tank, trailer AEBS solenoid valve, trailer relay valve, diaphragm brake chamber, and spring dual-chamber brake chamber.

[0007] The air inlet of the main vehicle relay valve is connected to the air source of the parking circuit, the control port of the main vehicle relay valve is connected to the main vehicle hand valve, and the air outlet of the main vehicle relay valve is connected to the trailer valve.

[0008] The trailer valve is connected to the rear axle brake foot valve, the front axle brake foot valve, and the trailer hand valve, respectively.

[0009] The air outlet of the trailer valve is connected to the dual-pipeline device inflation-red and the dual-pipeline device braking-yellow, respectively.

[0010] The air inlet of the emergency relay valve is connected to the dual-pipeline device inflation-red and the trailer air tank respectively; the control port of the emergency relay valve is connected to the dual-pipeline device brake-yellow; the air outlet of the emergency relay valve is connected to the control port of the trailer AEBS solenoid valve; and the air inlet of the trailer AEBS solenoid valve is connected to the trailer air tank.

[0011] The outlet of the trailer AEBS solenoid valve is connected to the brake chamber of the diaphragm brake chamber and the spring dual-chamber brake chamber.

[0012] The inlet of the trailer relay valve is connected to the trailer air tank; the control port of the trailer relay valve is connected to the dual-pipeline inflation-red connection; and the outlet of the trailer relay valve is connected to the spring chamber of the spring dual-chamber brake air chamber.

[0013] It should be further noted that the trailer relay valve vents the spring chamber gas in the double-chamber brake air chamber during the vehicle's parking brake and emergency brake operations.

[0014] It should be further noted that both the main vehicle hand valve and the trailer hand valve are air shut-off valves, and the air pressure input to the outlet is 0 when the vehicle is parked.

[0015] It should be further noted that the trailer AEBS solenoid valve is an electrically controlled valve;

[0016] The relay valves used for the main vehicle relay valve and the trailer relay valve are TPJ73-00-00 F-7 relay valves or 9730110010 relay valves.

[0017] The air pressure at the outlet and control port of the trailer's AEBS solenoid valve is the same. When wheel lock-up is detected, the air pressure at the outlet is adjusted electronically.

[0018] This invention also provides a method for coordinated braking of the main and trailer components using a trailer-mounted air-operated parking brake, the method comprising:

[0019] When the vehicle is in normal operation, the brake foot valve air pressure is 0, while the main vehicle hand valve and trailer hand valve are at high pressure.

[0020] The parking circuit air source supplies high-pressure air to the trailer valve through the main vehicle relay valve. The trailer valve supplies high-pressure air to the trailer through the dual-pipeline device inflation-red. The dual-pipeline device brake-yellow has an air pressure of 0.

[0021] The emergency relay valve connects the air inlet, and the dual-pipeline device charges the air inlet and charges the trailer's air tank.

[0022] At this time, the air pressure of the dual-pipeline braking system is 0, the air pressure of the emergency relay valve outlet, the control port of the trailer AEBS solenoid valve, and the air pressure of the outlet are all 0. The air pressure of the diaphragm brake chamber and the spring dual-chamber brake chamber is 0, and the brake is not engaged. At the same time, the control port and outlet of the trailer relay valve, and the spring chamber of the spring dual-chamber brake chamber are under high pressure, and the large spring in the chamber is compressed and does not participate in braking.

[0023] It should be further noted that the method also includes:

[0024] When the vehicle is braking, the brake foot valve is under high pressure, as are the main vehicle hand valve and the trailer hand valve.

[0025] The main vehicle relay valve and dual-line device are inflated and red-filled. The trailer relay valve operates in the same way as during normal driving, charging the trailer air tank and the large spring in the air chamber does not participate in braking.

[0026] It should be further noted that, in the method, when only the trailer is under parking brake, the brake foot valve air pressure is 0, the master vehicle hand valve is high pressure, and the trailer hand valve air pressure is 0.

[0027] Dual-line device inflation - red, dual-line device braking - yellow, all trailer components operate in the same way as the vehicle's service brake, engage the brakes;

[0028] During vehicle braking, the brake chambers of the diaphragm brake chamber and the spring dual-chamber brake chamber participate in braking, and the brake foot valve and trailer hand valve regulate the braking pressure through their operation;

[0029] When the vehicle is fully parked, the air pressure of the brake foot valve is 0, and the air pressure of the main vehicle hand valve and trailer hand valve is also 0; the main vehicle relay valve is closed, and no high-pressure air is supplied to the trailer valve; the air pressure of the dual-line device charging-red and dual-line device braking-yellow is 0, realizing the trailer air-cut-off parking brake.

[0030] When the emergency relay valve has zero air pressure at the inlet, the emergency braking function is activated, and the inlet and outlet are connected. At this time, the trailer AEBS solenoid valve is powered by the trailer air tank through the inlet and the air tank through the emergency relay valve to the control port as control air. The outlet is high pressure, which causes the brake chambers of the diaphragm brake chamber and the spring dual-chamber brake chamber to open and brake.

[0031] The trailer relay valve is powered by the trailer air reservoir through the air inlet, but the air pressure at the control port is 0 and the air pressure at the outlet is 0. The spring chamber of the spring dual-chamber brake air chamber is emptied through the exhaust port of the trailer relay valve, and the large spring in the air chamber participates in braking.

[0032] It should be further explained that, in the method, when the vehicle is parked for a long time, the high pressure air in the brake chamber of the diaphragm brake chamber and the spring dual-chamber brake chamber will gradually decrease along with the high pressure air in the trailer air reservoir. At this time, the spring chamber of the spring dual-chamber brake chamber is still 0, and the large spring of the chamber continues to participate in braking.

[0033] It should be further explained that, in the method, when the dual-circuit device inflation-red and dual-circuit device braking-yellow malfunction, the air pressure of the dual-circuit device inflation-red and dual-circuit device braking-yellow will be 0, triggering emergency braking.

[0034] At this time, the actions of all trailer components are the same as those of the vehicle's parking brake. The diaphragm brake chamber, the brake chamber of the spring-double chamber brake chamber, and the large spring of the spring chamber all participate in braking.

[0035] As can be seen from the above technical solutions, the present invention has the following advantages:

[0036] 1. In the trailer air-stop parking brake master-trailer coordinated braking system provided by the present invention, the master vehicle relay valve associates the air supply of the trailer valve with the master vehicle hand valve. When the master vehicle hand valve is pulled up, i.e., the entire vehicle is parked, the air pressure of the trailer valve air supply source is 0, and the air pressure of the dual-pipeline device inflation-red and dual-pipeline device braking-yellow is 0, i.e. trailer air-stop parking brake. This can meet the special requirements of some national regulations, provide more options for export commercial vehicles, and help improve market competitiveness.

[0037] 2. The trailer relay valve of the present invention associates the spring chamber of the spring dual-chamber brake air chamber with the air-filling red of the dual-pipeline device. When the air pressure is 0, i.e. when the vehicle is under parking brake or emergency brake, the air in the spring chamber is emptied, so that the large spring in the air chamber participates in braking, thereby enhancing the braking force and improving the safety of vehicle transportation.

[0038] 3. This invention can be matched with different braking forces according to different working conditions. When the vehicle is under service braking or only the trailer is under parking braking, the brake chambers of the diaphragm brake chamber and the spring dual-chamber brake chamber participate in braking, resulting in relatively weak braking force. The braking pressure can be adjusted via the brake foot valve and trailer hand valve, which have self-resetting characteristics, making it suitable for downhill driving, short-term stops, and other working conditions. When the entire vehicle is under parking braking or emergency braking, the brake chambers of the diaphragm brake chamber and the spring chamber of the spring dual-chamber brake chamber participate in braking simultaneously, resulting in strong braking force. This can be used for long-term stops, emergency stops, and other working conditions, ensuring the safety of the driver and vehicle.

[0039] 4. In this invention, the braking force is large during emergency braking. If the wheels lock up, the air pressure at the outlet can be adjusted by the electronic control of the trailer AEBS solenoid valve to reduce the braking air pressure in the diaphragm brake chamber and the spring dual-chamber brake chamber, thereby preventing wheel lock-up and ensuring that the vehicle can be controlled in direction, especially during emergency braking, thus improving vehicle safety performance. Attached Figure Description

[0040] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the main and trailer coordinated braking system for a trailer-mounted air-operated parking brake. Detailed Implementation

[0042] In the trailer-mounted coordinated braking system for air-operated parking brakes provided by this invention, various embodiments of the present disclosure will be described more fully below. The present disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present disclosure to the specific embodiments disclosed herein, but rather the present disclosure should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of the present disclosure.

[0043] In the master-trailer coordinated braking system of the trailer air-operated parking brake, the terms "comprising" or "may include" as used in the various embodiments of this disclosure indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in the various embodiments of this disclosure, the terms "comprising," "having," and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or adding one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing.

[0044] In various embodiments of the master-trailer coordinated braking system for trailer-mounted air-operated parking brakes, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0045] In various embodiments of the trailer-mounted air-operated parking brake coordinated braking system, terms such as "first" and "second" may modify various components in the various embodiments, but do not limit the corresponding components. For example, the above descriptions do not limit the order and / or importance of the components. The above descriptions are only used for the purpose of distinguishing one component from others. For example, "first user device" and "second user device" refer to different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of this disclosure, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

[0046] It should be noted that if a description is made of "connecting" one component to another, then the first component can be directly connected to the second component, and a third component can be "connected" between the first and second components. Conversely, when a component is "directly connected" to another component, it can be understood that there is no third component between the first and second components.

[0047] The following will combine Figure 1 This invention details the trailer-mounted air-operated parking brake master-trailer coordinated braking system, which can be applied to trailer braking adjustment to achieve master vehicle braking control, trailer braking control, and master-trailer combined braking control, meeting braking requirements, reducing vehicle driving risks, and playing a positive role in improving vehicle safety.

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please see Figure 1 The diagram shown is a schematic of a coordinated braking system for a trailer-mounted air-stop parking brake in a specific embodiment. The system includes: a master vehicle relay valve 1, a trailer valve 2, a dual-line device inflation-red 3, a dual-line device braking-yellow 4, an emergency relay valve 5, a trailer air reservoir 6, a trailer AEBS solenoid valve 7, a trailer relay valve 8, a diaphragm brake chamber 9, and a spring-loaded dual-chamber brake chamber 10.

[0050] The number of trailer air tanks 6, diaphragm brake chambers 9, and spring-loaded dual-chamber brake chambers 10 in this system can be set according to actual needs. For example, two trailer air tanks 6 can be set up, one for each brake. Two diaphragm brake chambers 9 and two spring-loaded dual-chamber brake chambers 10 can be set up.

[0051] The air inlet 1 of the main vehicle relay valve 1 is connected to the air source of the parking circuit, the control port 4 is connected to the main vehicle hand valve, and the air outlet 2 is connected to the trailer valve 2. Ports 41, 42, and 43 of the trailer valve 2 are respectively connected to the brake foot valve-rear axle, the brake foot valve-front axle, and the trailer hand valve. The air outlets 12 and 22 of the trailer valve 2 are respectively connected to the dual-pipeline device inflation-red 3 and the dual-pipeline device brake-yellow 4.

[0052] The air inlets one and three of the emergency relay valve 5 are respectively connected to the dual-pipeline device inflation-red 3 and the trailer air tank 6. The control port four and the air outlet two of the emergency relay valve 5 are respectively connected to the dual-pipeline device brake-yellow 4 and the control port four of the trailer AEBS solenoid valve 7.

[0053] The inlet of the trailer AEBS solenoid valve 7 is connected to the trailer air tank 6, and the outlet is connected to the brake chamber of the diaphragm brake chamber 9 and the spring-loaded dual-chamber brake chamber 10. The inlet and control port of the trailer relay valve 8 are connected to the dual-pipeline inflation device 3 and the trailer air tank 6, respectively, and the outlet is connected to the spring chamber of the spring-loaded dual-chamber brake chamber 10.

[0054] In this embodiment, the main vehicle relay valve 1 and trailer valve 2 are main vehicle components of the braking system, while the emergency relay valve 5, trailer air tank 6, trailer AEBS solenoid valve 7, trailer relay valve 8, diaphragm brake chamber 9, and spring dual-chamber brake chamber 10 are trailer components of the braking system. The dual-line device inflation-red 3 and dual-line device braking-yellow 4 are used to complete the braking transmission between the main vehicle and the trailer.

[0055] According to the embodiments of this application, both the main vehicle hand valve and the trailer hand valve are air shut-off valves. The air pressure at the outlet decreases as the valve opening increases, meaning the outlet pressure is high when the vehicle is in motion and zero when parked. The main vehicle hand valve can also cause the trailer hand valve to operate simultaneously. When the trailer hand valve operates independently, it has a self-resetting characteristic, facilitating brake release to adapt to different operating conditions.

[0056] Optionally, the relay valves used in the main vehicle relay valve 1 and the trailer relay valve 8 are ordinary relay valves. Both the main vehicle relay valve 1 and the trailer relay valve 8 are supplied with air from the air inlet 1 and control air from the control port 4. The air pressure at the air outlet 2 is equal to the air pressure at the control port 4.

[0057] It should be noted that trailer valve 2 is supplied with air from inlet 1, outlet 12 supplies power to the trailer, and outlet 22 provides control air to the trailer. The air pressure at outlet 22 is directly proportional to and approximately equal to that at control outlets 41 and 42, and inversely proportional to that at outlet 43. If the air pressure at outlet 12 of trailer valve 2 is 0, then the air pressure at outlet 22 of trailer valve 2 is also 0. If the air pressure at outlet 22 of trailer valve 2 is 0, and the air pressure remains unchanged after applying the brakes or engaging the handbrake, then the pressure at outlet 12 of trailer valve 2 will drop sharply until it reaches 0.

[0058] The high-pressure air from inlet one of the emergency relay valve 5 can be supplied unidirectionally to inlet three. When inlet one of the emergency relay valve 5 is high-pressure air, the air pressure at outlet two is proportional to and approximately equal to that at control port four. When the air pressure at inlet one is 0, inlet three supplies power to outlet two, and the air pressure at outlet two is independent of that at control port four.

[0059] In this embodiment, the trailer AEBS solenoid valve 7 is supplied with air from the first air inlet and control air from the fourth control port. The air pressure at the second air outlet is equal to the air pressure at the fourth control port. When wheel lock-up is detected, the air pressure at the second air outlet can be adjusted electronically.

[0060] The following are embodiments of the master-trailer coordinated braking method for trailer air-stop parking brake provided in this disclosure. This method belongs to the same inventive concept as the master-trailer coordinated braking system for trailer air-stop parking brake in the above embodiments. For details not described in detail in the embodiments of the master-trailer coordinated braking method for trailer air-stop parking brake, please refer to the embodiments of the master-trailer coordinated braking system for trailer air-stop parking brake described above.

[0061] The method includes: when the vehicle is driving normally, the brake foot valve air pressure is 0, while the master vehicle hand valve and trailer hand valve are high pressure. The parking circuit air source supplies high pressure air to the trailer valve 2 through the master vehicle relay valve 1. The trailer valve 2 supplies high pressure air to the trailer through the dual-line inflation device - red 3. The air pressure of the dual-line brake device - yellow 4 is 0.

[0062] Emergency relay valve 5 connects air inlets 1 and 1-2, and the dual-pipeline inflation device (red 3) charges the trailer air reservoir 6. At this time, because the air pressure of the dual-pipeline braking device (yellow 4) is 0, the air pressure at outlet 2 of emergency relay valve 5, control port 4 of trailer AEBS solenoid valve 7, and outlet 2 is 0, the brake chamber pressure of diaphragm brake chamber 9 and spring dual-chamber brake chamber 10 is 0, and the brakes are not engaged. Simultaneously, control port 4 of trailer relay valve 8, outlet 2, and the spring chamber of spring dual-chamber brake chamber 10 are under high pressure, compressing the large spring in the chamber and preventing it from participating in braking.

[0063] According to an embodiment of this application, when the vehicle is braking, the brake foot valve is under high pressure, as are the main vehicle hand valve and the trailer hand valve. The main vehicle relay valve 1, the dual-line device inflation-red 3, and the trailer relay valve 8 operate in the same way as during normal driving, charging the trailer air reservoir 6 while the large spring in the air chamber does not participate in braking. Because the brake foot valve is under high pressure and the dual-line device braking-yellow 4 is under high pressure, the emergency relay valve 5 and the trailer AEBS solenoid valve 7 open, and high-pressure air is input into the brake chambers of the diaphragm brake chamber 9 and the spring dual-chamber brake chamber 10, thus activating the service brake.

[0064] In this method, when only the trailer is under parking brake, the brake foot valve pressure is 0, the main vehicle hand valve is high pressure, and the trailer hand valve pressure is 0. The dual-line device is inflated (red 3), the dual-line device is braked (yellow 4), and all trailer components operate in the same way as the vehicle's service brake, activating the brakes. During service brake operation and when only the trailer is under parking brake, the diaphragm brake chamber 9 and the spring-loaded dual-chamber brake chamber 10 participate in braking. The brake foot valve and trailer hand valve can adjust the braking pressure through their operation. The driver can manually judge and adjust the braking force according to the working conditions, but the overall braking force is relatively weak. Furthermore, the brake foot valve and trailer hand valve have self-resetting characteristics; that is, releasing the brake foot valve or trailer hand valve immediately releases the brakes, meeting the needs of conditions such as downhill parking brake only for the trailer and brief stops at intersections.

[0065] When the vehicle is fully parked, the air pressure in the brake foot valve is 0, and the air pressure in the master vehicle hand valve and trailer hand valve is also 0. The master vehicle relay valve 1 is closed, and no high-pressure air is supplied to the trailer valve 2. The air pressure in the dual-line device charging-red 3 and the dual-line device braking-yellow 4 is 0, realizing the trailer's air-cut parking brake. Because the air pressure at the inlet of the emergency relay valve 5 is 0, the emergency braking function is activated, and the inlet of the emergency relay valve 5 is connected to the outlet of the emergency relay valve 5. At this time, the trailer AEBS solenoid valve 7 is powered by the trailer air tank 6 through the inlet of the emergency relay valve 5, and the control air is supplied from the trailer air tank 6 through the emergency relay valve 5 to the control port of the emergency relay valve 5. The outlet of the emergency relay valve 5 is high pressure, which causes the brake chambers of the diaphragm brake chamber 9 and the spring dual-chamber brake chamber 10 to open and brake. The trailer relay valve 8 is powered by the trailer air reservoir 6 through inlet 1, but the air pressure at control port 4 and outlet 2 is 0. The spring chamber of the spring-dual-chamber brake chamber 10 is emptied through outlet 3 of the trailer relay valve 8, and the large spring in the chamber participates in braking. When the vehicle is parked for an extended period, the high-pressure air in the diaphragm brake chamber 9 and the brake chamber of the spring-dual-chamber brake chamber 10 will gradually leak and decrease along with the high-pressure air in the trailer air reservoir 6, thereby releasing the brake. At this time, the spring chamber of the spring-dual-chamber brake chamber 10 remains at 0, and the large spring in the chamber continues to participate in braking, providing a basic guarantee for vehicle parking safety.

[0066] As an example, when the dual-line inflator (Red 3) or brake (Yellow 4) of the vehicle experiences a rupture, disconnection, or leak, the air pressure in both devices will drop to 0, triggering emergency braking. At this time, the operation of all trailer components is identical to that of the vehicle's parking brake. The diaphragm brake chamber 9, the brake chamber of the spring-dual-chamber brake chamber 10, and the large spring in the spring chamber all participate in braking, resulting in strong braking capability. This ensures timely stopping of the vehicle in unexpected situations, improving transportation safety.

[0067] When the vehicle is under service braking, trailer-only braking, or emergency braking, if the wheels do not lock up, the brake air pressure in the diaphragm brake chamber 9 and the spring-loaded dual-chamber brake chamber 10 depends on the air pressure at the control port 4 of the trailer AEBS solenoid valve 7. If wheel lockup is detected, the trailer AEBS solenoid valve 7 adjusts the air pressure at the outlet 2 electronically, reducing the brake air pressure in the diaphragm brake chamber 9 and the spring-loaded dual-chamber brake chamber 10 to prevent wheel lockup. Especially during emergency braking, the braking force is greater, making wheel lockup more likely. The trailer AEBS solenoid valve 7 maximizes vehicle directional control during braking, improving vehicle safety performance.

[0068] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coordinated braking system for a trailer-mounted air-operated parking brake, characterized in that, include: Main vehicle relay valve (1), trailer valve (2), dual-line device inflation-red (3), dual-line device braking-yellow (4), emergency relay valve (5), trailer air tank (6), trailer AEBS solenoid valve (7), trailer relay valve (8), diaphragm brake chamber (9), spring dual-chamber brake chamber (10); The air inlet of the main vehicle relay valve (1) is connected to the parking circuit air source, the control port of the main vehicle relay valve (1) is connected to the main vehicle hand valve, and the air outlet of the main vehicle relay valve (1) is connected to the trailer valve. The trailer valve (2) is connected to the rear axle brake foot valve, the front axle brake foot valve, and the trailer hand valve, respectively. The air outlet of the trailer valve (2) is connected to the dual-pipeline device inflation-red (3) and the dual-pipeline device braking-yellow (4) respectively; The air inlet of the emergency relay valve (5) is connected to the dual-pipeline device inflation-red (3) and the trailer air tank (6) respectively. The control port of the emergency relay valve (5) is connected to the dual-pipeline device brake-yellow (4). The air outlet of the emergency relay valve (5) is connected to the control port of the trailer AEBS solenoid valve (7). The air inlet of the trailer AEBS solenoid valve (7) is connected to the trailer air tank (6). The outlet of the trailer AEBS solenoid valve (7) is connected to the brake chambers of the diaphragm brake chamber (9) and the spring dual-chamber brake chamber (10); The air inlet of the trailer relay valve (8) is connected to the trailer air tank (6); the control port of the trailer relay valve (8) is connected to the dual-pipeline device inflation-red (3); and the air outlet of the trailer relay valve (8) is connected to the spring chamber of the spring dual-chamber brake air chamber (10).

2. The trailer-mounted coordinated braking system for a trailer-mounted air-operated parking brake according to claim 1, characterized in that, The trailer relay valve (8) vents the spring chamber gas in the spring double-chamber brake chamber (10) during the vehicle's parking brake and emergency brake.

3. The trailer-mounted coordinated braking system for a trailer-mounted air-operated parking brake according to claim 1, characterized in that, Both the main vehicle hand valve and the trailer hand valve are air shut-off valves, and the air pressure input to the outlet is 0 when the vehicle is parked.

4. The trailer-mounted coordinated braking system for air-operated parking brakes according to claim 1, characterized in that, The trailer AEBS solenoid valve (7) is an electrically controlled valve; The relay valves used for the main vehicle relay valve (1) and the trailer relay valve (8) are TPJ73-00-00 F-7 relay valves or 9730110010 relay valves.

5. The trailer-mounted coordinated braking system for a trailer-mounted air-stop parking brake according to claim 4, characterized in that, The air pressure at the outlet of the trailer AEBS solenoid valve (7) is the same as that at the control port. When wheel lock-up is detected, the air pressure at the outlet is adjusted by electronic control.

6. A method for coordinated braking of the main and trailer components using a trailer-mounted air-operated parking brake, characterized in that, The method employs the trailer-mounted coordinated braking system for a trailer-mounted air-operated parking brake as described in any one of claims 1 to 5; the method includes: When the vehicle is in normal operation, the brake foot valve air pressure is 0, while the main vehicle hand valve and trailer hand valve are at high pressure. The parking circuit air source supplies high-pressure air to the trailer valve (2) through the main vehicle relay valve (1). The trailer valve (2) supplies high-pressure air to the trailer through the dual-pipeline device inflation-red (3). The air pressure of the dual-pipeline device brake-yellow (4) is 0. The emergency relay valve (5) connects the air inlet, and the dual-pipeline device charges the air-red (3) to charge the trailer air tank (6); At this time, the air pressure of the dual-pipeline device brake-yellow (4) is 0, the air pressure of the outlet of the emergency relay valve (5), the control port of the trailer AEBS solenoid valve (7), and the air pressure of the outlet are 0, the air pressure of the diaphragm brake chamber (9) and the brake chamber of the spring double chamber brake chamber (10) are 0, and the brake is not activated; at the same time, the control port and outlet of the trailer relay valve (8) and the spring chamber of the spring double chamber brake chamber (10) are under high pressure, the large spring of the air chamber is compressed and does not participate in the braking.

7. The method for coordinated braking of the main and trailer vehicles using a trailer-mounted air-operated parking brake according to claim 6, characterized in that, The method also includes: When the vehicle is braking, the brake foot valve is under high pressure, as are the main vehicle hand valve and the trailer hand valve. The main vehicle relay valve (1), the dual-pipeline device inflation-red (3), and the trailer relay valve (8) operate in the same way as normal driving, charging the trailer air tank (6) and the large spring in the air chamber does not participate in braking.

8. The method for coordinated braking of the main and trailer vehicles using a trailer-mounted air-stop parking brake according to claim 6, characterized in that, In the method, when only the trailer is under parking brake, the brake foot valve air pressure is 0, the main vehicle hand valve is high pressure, and the trailer hand valve air pressure is 0. Dual-circuit device inflation - red (3), dual-circuit device braking - yellow (4), all trailer components operate in the same way as the vehicle service brake, activate the brake; During service braking, the brake chambers of the diaphragm brake chamber (9) and the spring double-chamber brake chamber (10) participate in braking, and the brake foot valve and trailer hand valve regulate the braking pressure through their actions; When the vehicle is fully parked, the air pressure of the brake foot valve is 0, and the air pressure of the main vehicle hand valve and trailer hand valve is also 0; the main vehicle relay valve (1) is closed, and no high-pressure air is supplied to the trailer valve (2). The air pressure of the dual-pipeline device charging-red (3) and the dual-pipeline device braking-yellow (4) is 0, thus realizing the trailer air-cut parking brake. Because the air pressure at the inlet of the emergency relay valve (5) is 0, the emergency braking function is activated, and the inlet and outlet are connected. At this time, the trailer AEBS solenoid valve (7) is powered by the trailer air tank (6) through the inlet and by the trailer air tank (6) through the emergency relay valve (5) to the control port as control air. The outlet is high pressure, which causes the brake chambers of the diaphragm brake chamber (9) and the spring double chamber brake chamber (10) to open and brake. The trailer relay valve (8) is powered by the trailer air reservoir (6) through the air inlet, but the air pressure at the control port is 0 and the air pressure at the outlet is 0. The spring chamber of the spring double-chamber brake air chamber (10) is emptied through the exhaust port of the trailer relay valve (8), and the large spring of the air chamber participates in braking.

9. The method for coordinated braking of the main and trailer vehicles using a trailer-mounted air-stop parking brake according to claim 6, characterized in that, In the method, when the vehicle is parked for a long time, the high pressure air in the brake chambers of the diaphragm brake chamber (9) and the spring double-chamber brake chamber (10) will gradually decrease along with the high pressure air in the trailer air reservoir (6). At this time, the spring chamber of the spring double-chamber brake chamber (10) is still 0, and the large spring of the chamber continues to participate in braking.

10. The method for coordinated braking of the main and trailer vehicles using a trailer-mounted air-stop parking brake according to claim 6, characterized in that, In the method, when the dual-circuit device inflation-red (3) and dual-circuit device braking-yellow (4) of the vehicle malfunction, the air pressure of dual-circuit device inflation-red (3) and dual-circuit device braking-yellow (4) is 0, triggering emergency braking; At this time, the actions of all trailer components are the same as the vehicle's parking brake. The brake chambers of the diaphragm brake chamber (9), the spring double-chamber brake chamber (10), and the large spring of the spring chamber all participate in braking.

Images