121 results about "Relay valve" patented technology

The utility model relates to a valve device for a vehicle electronic brake system and the vehicle electronic brake system. The valve device comprises a shell; an actuation assembly having a push rod; a first piston; a first spacer in which a pilot chamber in the housing is in fluid communication with a brake pedal side of a brake circuit of the vehicle electronic brake system; a second spacer having a control chamber in fluid communication with a brake side of the brake circuit and a high pressure chamber in fluid communication with a high pressure source side of the brake circuit; a relay valve comprising a second piston, in an unactivated valve position in which the push rod retracts and the second piston abuts against the second spacer to isolate the high pressure chamber from the control chamber, and in a working valve position in which the actuation assembly extends and urges the first piston through the second spacer to urge the second piston to fluidly communicate the high pressure chamber with the control chamber, high-pressure gas from the high-pressure gas source side enters the brake side through the high-pressure cavity and the control cavity so as to be used for generating brake pressure. According to the valve device and system, the risk that the electromagnetic valve fails is reduced.

The utility model discloses a brake hydraulic element fault detection system and a mining dump truck. The brake hydraulic element fault detection system comprises an oil tank, a variable pump, a pedal valve, a relay valve, an angle sensor, a controller, a brake and a pressure sensor. The oil tank is used for storing hydraulic oil; the variable pump is connected with the oil tank, serves as a hydraulic system oil source and outputs hydraulic oil outwards; the pedal valve and the relay valve are respectively connected with the variable pump; the pedal valve outputs pressure oil which is proportional to a pedal angle to a pilot port of the relay valve; the angle sensor mounted on the pedal is used for sending the detected angle of the treaded pedal to the controller; the brake is connected with the relay valve, and the relay valve outputs pressure oil proportional to the pressure of the pilot port to the brake; the pressure sensor is electrically connected with the controller and sends the detected pressure of the brake to the controller, and the controller judges whether the pedal valve and the relay valve break down or not by analyzing the angle of the pedal valve and the pressure of the brake.

A mine dump truck wet disc brake hydraulic system, including main control valve, one end of main control valve is connected pressure oil source, the other end is connected front brake system and middle and rear brake system, front brake system includes brake pedal, front axle proportional control valve group, front axle brake valve group and front brake cylinder, middle and rear brake system includes brake pedal, slow running valve, middle and rear axle brake valve, rear axle proportional valve group, relay valve group, rear axle brake cylinder and middle axle brake cylinder, the utility model discloses a mine dump truck wet disc brake hydraulic system can realize manual operation brake and line control remote brake function, reaches unmanned operation's requirement, is used for unmanned vehicle or auxiliary driving, and in order to adapt to the distance of middle and rear axle of three axle vehicle and the distance of main brake valve group is longer, two relay valve groups are added, brake corresponding speed is improved, faster brake response is realized, makes travel more safe.

The invention provides a pneumatic valve device, a pneumatic brake system and a commercial vehicle. The pneumatic valve device comprises a first air pressure port used for receiving air source pressure of a lower pressure value; the second air pressure port is used for transmitting trailer braking pressure; the third air pressure port is used for outputting trailer brake control air pressure; the first air pressure port is connected with the third air pressure port through a working cavity of the relay valve; the fourth air pressure port is used for receiving the air source pressure with the higher pressure value; the control end of the energy supply valve is connected with the first air pressure port, an air inlet of the energy supply valve is connected with the fourth air pressure port, an air outlet of the energy supply valve is connected with the second air pressure port, the energy supply valve is constructed to make the air inlet and the air outlet communicated when the pressure of the control end of the energy supply valve is larger than an opening threshold value, and the opening threshold value is smaller than the first pressure value. The air source pressure with the higher pressure value can be introduced into the trailer braking system, the energy storage capacity of the trailer braking system is improved, the trailer braking response time can be shortened, and the whole vehicle braking efficiency is improved.

This utility model relates to the field of pilot-operated relay valves, specifically a pilot-operated relay valve for a control system. The utility model includes a valve body with a first through-hole. A sealing cap is provided at one end of the first through-hole. A first inlet and a second inlet are connected to one side of the first through-hole, and an outlet is connected to the side of the first through-hole away from the first inlet. A control chamber is provided at the end of the first through-hole away from the sealing cap. A piston plate is slidably connected to the control chamber, and a valve core is fixedly connected to the piston plate, extending into the first through-hole. A first locking block is provided within the first through-hole, and a second elastic element is fixedly connected to the sealing cap. A steel ball is provided on the second elastic element, and a second through-hole is provided on the first locking block. A second locking block is provided within the first through-hole, and a third through-hole is provided on the first locking block. A first conical surface is provided within the third through-hole, and a second conical surface is provided on the middle section of the valve core. The technical solution of this utility model can improve the problem of damage to Y-type gaskets after long-term use.

The present invention relates to a fail-safe bypass valve assembly (1) for a pneumatic parking brake unit (120) of an electronically controllable pneumatic braking system (100), comprising: a first path (2) with an electromagnetic monostable valve (6); a second path (4) with a bistable valve unit (12); and a relay valve (10); wherein the first path (2) and the second path (4) receive a main parking brake pressure (pPA) from the pneumatic parking brake unit (120), wherein, at a first stable switching position of the bistable valve unit (12), the main parking brake pressure (pPA) is controlled at the relay valve control port (10.4) of the relay valve (10) independently of the switching position of the first monostable valve (6), and at a second stable switching position of the bistable valve unit (12), the relay valve control port (10.4) vents when the first monostable valve (6) is de-energized to vent at least one spring-loaded brake cylinder (125a, 125b).

The utility model discloses a relay valve sealing performance test device, relates to the relay valve sealing technology field, and comprises a pedestal, a test box and a first air cylinder, the top end of the pedestal is provided with the first air cylinder and a second air cylinder, and the input end of the first air cylinder and the input end of the second air cylinder are respectively provided with a first stop valve and a third stop valve. One end of the first air storage cylinder and one end of the second air storage cylinder are each provided with a first air pressure meter, a second stop valve is arranged at the output end of the first air storage cylinder, a test box is arranged at the top end of the base, a positioning frame is installed at the top end of the test box, and a relay valve body is arranged in the positioning frame; the device is provided with a test box bottom end drain pipe which is used for draining water into a water tank, an operator can pull a pull rod outwards, so that the pull rod drives a spring to stretch outwards, the pull rod is further separated from the outer wall of a mounting block, quick disassembly is met, and a next group of relay valves can be conveniently tested.

The invention relates to the field of rail transit, in particular to a rail transit vehicle electric pneumatic braking control system and method.The control system comprises an electronic braking control unit, a common pre-control branch, an emergency pre-control branch and a relay valve, and the electronic braking control unit is used for controlling the common pre-control branch to output common pre-control pressure; the emergency pre-control branch comprises an emergency valve, a remote relief electromagnetic valve and an empty and load valve, the empty and load valve outputs emergency pre-control pressure corresponding to vehicle load information, and the relay valve receives common and emergency pre-control pressure and selects one of the common and emergency pre-control pressure to output corresponding compressed air to a brake cylinder; the electronic brake control unit analyzes the service brake instruction, the service pre-control pressure and the pressure value at the output position of the relay valve, can judge the emergency valve fault and control the remote relieving electromagnetic valve to empty compressed air of the emergency pre-control branch, and the problems that after the emergency valve fault occurs, the emergency air path pressure is not relieved, and the relieving capacity of the air path pressure is unstable are solved.

The application provides a JZ-7 remote control braking system, which comprises a total air pipe, a first passage, a second passage and a third passage, a relay valve, an equalizing air cylinder, a first high-speed electric air valve, an overcharge air cylinder, a control device, a CCU and a remote network control unit, the total air pipe is connected with the overcharge pipe of the relay valve after being communicated with the first passage, and the gas outlet of the first passage is also communicated with the exhaust port of the overcharge air cylinder; the total air pipe is connected with the equalizing pipe of the relay valve after being communicated with the second passage, and the gas outlet of the second passage is also communicated with the first high-speed electric air valve and the equalizing air cylinder respectively; the total air pipe is connected with the cut-off pipe of the relay valve after being communicated with the third passage, and the train pipe of the relay valve is also connected with an electric air release valve. The application can realize remote networking operation of the braking system, and the locomotive can implement braking and relieving functions without operating the automatic brake valve.

This invention relates to an air backup braking system and a locomotive. The system includes: a backup switching valve with two positions: normal and air position; a backup pressure regulating valve; a pressure measuring point; a backup brake valve with three positions: braking, neutral, and release; a backup equalizing pressure cylinder; and a backup relay valve, used to output its A2 port pressure in real time according to the pressure of the equalizing cylinder when the air backup mode is activated. Specifically, in the normal position of the backup switching valve, ports A2 and A3 of the backup switching valve are connected, cutting off the main air supply to the backup brake valve, venting the pressure at the control port C1 of the first, second, and third switching valves, and outputting a high-level signal. In the air position of the backup switching valve, ports A1 and A2 are connected, and the main air supply is simultaneously output through the pressure at port A2 to the control port C1 of the first, second, and third switching valves, and outputting a low-level signal. This invention solves the technical problem of the inability to switch in real time after a locomotive electro-pneumatic brake failure.

The present invention relates to a relay valve (18) for an electropneumatic control device (1), comprising: a pneumatic control input (20) which is connected to a control chamber (42) of the relay valve (18), a working output (28) which is connected to a working chamber (58) of the relay valve (18), at least a first throttling element (30) that connects the working chamber (58) and the control chamber (42), a supply inlet (16) which is connected to a storage chamber (60) of the relay valve (18), a double seat valve (50, 54) with at least one inlet seat (54) and at least one outlet seat (50), a relay piston (46) for actuating the double seat valve (50, 54), wherein the working chamber (58) is connected to a vent (56) when the outlet seat (50) is open and to the storage chamber (60) when the inlet seat (54) is open, and wherein the relay valve (18) has at least one second throttling element (65, 65', 65'', 65'''', 65'''', 65'''''') which is arranged such that the working chamber (58) and the vent (56) are in throttled flow communication with each other at least in an intermediate position of the relay piston (46) between the vent position and the ventilation position via the at least one second throttling element (65, 65', 65'', 65'''', 65'''', 65'''''') and that the at least one second throttling element (65, 65', 65'', 65'''', 65'''', 65'''''') is completely closed in the ventilation position.

The application discloses a kind of warning device and use method applied to density relay valve, it is related to power distribution equipment field, and the warning device applied to density relay valve includes knob, linkage assembly and control component, knob is nested with relay valve cooperation, linkage assembly includes fixed link with knob and switch piece controlled by link, and the power supply is realized by the setting of switch piece to on-off, control component includes power supply and warning piece controlled by switch piece, warning information can be sent to staff by warning piece, staff is constantly prompted, so that staff can know that he needs to close relay valve after maintenance ends, will not lead to forget, staff rotates relay valve to drive knob rotation, triggers power switch, so that warning piece constantly sends early warning prompt.

The application relates to a multi-mode brake system of a special vehicle, which comprises an emergency relay valve, a first relay valve, a second relay valve, an ABS controller, a foot brake valve, a hand brake valve, a normally open electromagnetic valve, a normally closed electromagnetic valve, an electric control proportional valve, a first shuttle valve, a second shuttle valve, a third shuttle valve, an air compressor and a plurality of brake chambers. The application can realize various modes of braking, two-by-two interlocking, automatic switching according to the walking mode of the vehicle, satisfy the overall brake system, can not only guarantee traction braking, but also does not affect the braking work when the vehicle independently walks; and is reasonably designed, can satisfy the integrated brake system of a vehicle under various walking mode states, is complete in function and improves work efficiency.

The utility model belongs to the technical field of vehicle braking, and particularly relates to a brake-by-wire system and a wide-body mining dump truck, which comprise an air supply unit, a multi-loop protection valve, a braking execution unit, a pair of front axle braking air chambers, a plurality of pairs of middle and rear axle braking air chambers, a front axle braking loop, a front axle air cylinder, a single-channel EBS valve and a middle and rear axle braking loop, comprising a middle-rear axle air cylinder, a multi-channel EBS valve, a service brake valve and an electromagnetic relay valve. According to the utility model, the electromagnetic relay valve is arranged, the air inlet is communicated with the middle and rear axle air reservoir, the first air outlet is communicated with the control port of the single-channel EBS valve, and the second air outlet is communicated with the control port of the multi-channel EBS valve, so that an air braking safety system and an electronic braking safety system are combined, and an automatic braking auxiliary function is realized; the braking system can actively brake when encountering sudden dangerous situations or the distance between the braking system and a front vehicle and pedestrians is smaller than the safe distance, and therefore the performance and safety of the braking system are improved.

The utility model relates to the technical field of brake systems, and provides a slag ladle vehicle brake system which comprises a front brake mechanism, a rear brake mechanism and an inflator pump for supplying air to the front brake mechanism and the rear brake mechanism, the front brake mechanism comprises a front air cylinder, a front brake relay valve, a hand brake relay valve and a front brake mechanism, and the rear brake mechanism comprises a rear air cylinder, a rear brake relay valve and a rear brake mechanism. The rear brake mechanism comprises a rear air cylinder, a rear brake relay valve and a rear brake mechanism, the front air cylinder is communicated with a brake main valve used for changing the front brake relay valve and the rear brake relay valve to control on-off of air, and the hand brake relay valve is communicated with a hand brake valve used for changing the hand brake relay valve to control on-off of air. The front air cylinder is communicated with the air inlet end of the front brake relay valve and the air inlet end of the hand brake relay valve, the air outlet end of the front brake relay valve and the air outlet end of the hand brake relay valve are both communicated with the front brake mechanism, the air inlet end of the rear brake relay valve is communicated with the rear air cylinder, and the air outlet end of the rear brake relay valve is communicated with the rear brake mechanism. And the maintenance cost is reduced.

The utility model discloses a kind of electrical double control brake systems of remote control loader, it belongs to engineering machinery technical field.It solves the defect that human driving control cannot adapt to narrow space operation, operation under dangerous environment in the conventional loader braking of prior art.Its main structure includes air source assembly, air source assembly is connected with parking component and control component respectively, control component is also connected with the execution component for controlling vehicle brake, control component includes gas brake valve, relay valve, proportional solenoid valve and shuttle valve, the air outlet of air source assembly is connected with gas brake valve, relay valve and proportional solenoid valve respectively, gas brake valve is connected in parallel with relay valve, and the two air inlets of shuttle valve are connected with gas brake valve and relay valve respectively, the signal end of relay valve is also connected with proportional solenoid valve.The utility model is mainly used on loader and other engineering machinery.

The present invention provides a relay valve fault diagnosis and location method and device. This relay valve fault diagnosis and location method is used to determine the fault status and location of a relay valve having multiple chambers. The method comprises the following steps: collecting actual internal pressure data for each chamber and actual external pressure data corresponding to each chamber; comparing the collected actual internal pressure data and actual external pressure data with pre-acquired fault data; and determining the relay valve fault status and location. This invention solves the technical problems of relay valve fault diagnosis and location, which are difficult, inaccurate, and labor-intensive.

The invention relates to the field of parking braking, and discloses a commercial vehicle electronic parking system with a temporary traffic function, an electronic parking assembly and a control method.When a fourth electromagnetic valve is powered on, air source compressed air passes through the fourth electromagnetic valve, and a temporary stop air path opens a driving relay valve; when the air pressure reaches the set value, the fourth electromagnetic valve is powered off, and the temporary stop air path is in a pressure maintaining state; when the third electromagnetic valve is opened and the third electromagnetic valve is closed, compressed air of the temporary stop air path is communicated to the exhaust port through the third electromagnetic valve. The system not only can provide a common parking function, but also can provide a temporary parking function, and is suitable for a common commercial vehicle assembled with an ABS (Anti-lock Brake System).

The present application provides a kind of tractor redundancy safety air pressure brake system, the proportional relay valve is used to when electronic brake system normal, according to the pressure correspondence of pre-stored control port and outlet, and the pressure value of actual control port, the pressure of output to ABS solenoid valve inlet is decided, so as to adjust the braking force of left and right sides, to adjust the situation of running deviation in vehicle braking process;When electronic brake system fails, the outlet of proportional relay valve is communicated with inlet, and the outlet air pressure of electronic brake system acts on ABS solenoid valve through proportional relay valve, realizes the braking of front axle, to ensure the remaining braking efficiency under the condition of electronic brake system failure, achieves redundancy brake effect, effectively improves the reliability of tractor safety brake system.

The present disclosure relates to a self-adjusting relay valve, which aims to prevent the problem of insufficient braking force when the vehicle is fully loaded and excessive braking force when the vehicle is empty. The relay valve is characterized in that the piston comprises an inner operating section, an outer annular section and an intermediate annular section in the lower part thereof, the inner operating section is operable to act on an intake and exhaust assembly, through which the intake cavity is communicated with or disconnected from the first annular cavity; a pressure regulating assembly is arranged in the pressure regulating cavity of the lower housing, the pressure regulating cavity is communicated with the first annular cavity and the second annular cavity respectively, and the pressure regulating assembly is capable of communicating or disconnecting the first annular cavity and the second annular cavity by means of a trigger device. The relay valve can automatically adjust the pressure change ratio of the output port and the control port of the relay valve by means of the trigger device and the pressure regulating assembly according to the empty or full load state of the vehicle, thereby preventing the problem of insufficient braking force when the vehicle is fully loaded and excessive braking force when the vehicle is empty.

The application relates to the brake technical field and provides a relay valve and a brake system. The relay valve comprises a first shell, a second shell and a relay piston, the relay piston and the first shell define a control cavity, the first shell is provided with a control interface, the relay piston and the second shell define a brake cavity, and the second shell is provided with an exhaust interface; the first shell is further provided with a communication cavity which is in communication with the control cavity and the brake cavity; the relay valve further comprises a first check valve which is arranged in the communication cavity and can cut off the communication cavity under the action of the gas pressure of the control cavity and can guide the communication cavity to be in communication under the action of the gas pressure of the brake cavity; in the state that the brake is released and the exhaust interface is blocked, the gas pressure in the brake cavity pushes the first check valve to guide the communication cavity to be in communication. When the brake is released, if the exhaust interface is blocked, the gas in the brake cavity can push the first check valve to guide the communication cavity to be in communication, so that the brake pressure is discharged through the control interface, and the safety of the vehicle is improved.

The utility model discloses deburring equipment for an automobile anti-lock relay valve shell, which relates to the technical field of deburring and comprises an equipment support, a working table is fixedly mounted at the upper end of the equipment support, a gantry support is fixedly mounted at the upper end of the working table, and a dust guide component is slidably mounted on the gantry support. The dust guide assembly is composed of a taper pipe, a protective net, a connecting pipe and a first connecting frame, the protective net is fixedly installed on the inner wall of the taper pipe, the connecting pipe is fixedly installed at the upper end of the taper pipe, and the first connecting frame is fixedly installed at the upper end of the connecting pipe. And meanwhile, the connecting assembly is connected with dust collection equipment, metal dust generated in the polishing and deburring process can be collected and treated, so that the dust is prevented from floating in the air for a long time, the probability that the dust is inhaled into the body by surrounding workers can be reduced, and the body health of the surrounding workers is finally facilitated.

A brake system includes an air production module, a trailer control module, a park brakes relay valve and a supply coupling head for supplying air under pressure to brakes of a trailer. A trailer brakes relay valve is permanently supplied with air under pressure and controls supply of air under pressure to the supply coupling head. The trailer brakes relay valve has two control input ports. When control air is applied to either one or both of the control input ports of the trailer brakes relay valve, the trailer brakes relay valve supplies air under pressure to the supply coupling head. When no control air is applied on both of the control ports of the trailer brakes relay valve, the trailer brakes relay valve does not supply air under pressure to the supply coupling head.

A kind of automobile parking system, including air reservoir, double electromagnetic valve, double-way check valve, differential valve, relay valve, left gas chamber, right gas chamber and controller;Air reservoir connects the air inlet of double electromagnetic valve, the air outlet of first electromagnetic valve connects the air inlet of double-way check valve, the air outlet of double-way check valve is respectively connected with the control port of relay valve and the first control port of differential valve, the air outlet of relay valve is respectively connected with first service brake chamber and second service brake chamber;The air outlet of second electromagnetic valve connects the second control port of differential valve, the air outlet of differential valve is respectively connected with first parking brake chamber and second parking brake chamber;Air reservoir connects the air inlet of differential valve;Controller is connected with double electromagnetic valve.Compared with prior art, the utility model can avoid the brake force superposition of service brake and parking brake, to avoid damaging brake.Secondly, the respective execution of parking and temporary stop function can be realized, avoid temporary stop brake function acting on rear axle parking chamber, cause fatigue damage.

The utility model belongs to hand brake relay valve technical field, concretely relates to a shockproof noise reduction hand brake relay valve support, including support body, the top surface of support body is equipped with damping spring, the top of damping spring is connected with fixed frame, and the relay valve is placed in the top of fixed frame, and the relay valve bottom screw rod is connected with the nut of fixed frame screw thread, the top of nut abuts on support body bottom, the top surface of support body top surface is equipped with connecting lug, the surface of connecting lug is connected with the protective cover of first bolt screw thread, and the surface of protective cover is connected with the fixed cover of open end top surface. The utility model, through the mutual cooperation between protective cover, fixed cover, side plate, sliding slot, sliding block, adjusting Tuo, second bolt, rubber sleeve, first connecting tongue, threaded tube and second connecting tongue, utilize fixed cover and adjusting Tuo to clamp and fix the position of pipeline to be connected with relay valve, further avoid the loose of relay valve and pipeline connecting part when running, further influence the stability of vehicle.

The application provides a rear axle module assembly which integrates a relay valve assembly and an ABS electromagnetic valve assembly, and further comprises an ASR valve, a pressure sensor, a yaw angle sensor and a controller (14); the assembly is provided with a control gas port (4) which is used for being connected with a gas brake valve; the assembly is further provided with an air inlet (1), air outlets (21, 22, 23, 24) and air outlets (3, 31); the air inlet (1) is used for being connected with an air reservoir, the air outlets (21, 22, 23, 24) are used for being connected with brake air chambers, and the air outlets (3, 31) are communicated with the outside atmosphere. The assembly has the advantages of simple structure, low cost and light weight.

The invention relates to an electropneumatic brake pressure regulator (1) comprising: an electronic control unit (3); an electropneumatic valve assembly (2) connected to the first supply connection (9) for receiving a first supply pressure (pS) and configured to provide a first brake pressure (pB1) to the first passage connection (5), the electropneumatic valve assembly comprising an electropneumatic pilot control unit (11), a redundant valve assembly (15) and a relay valve unit (13), the electropneumatic brake pressure regulator (1) comprises a single housing (29), and wherein the electropneumatic pilot control unit (11), the redundant valve assembly (15) and the relay valve unit (13) are combined within the housing (29). The invention also relates to an electropneumatic brake system (200), a vehicle (300) and a method (400) for providing redundant functionality of an electropneumatic brake system (200).

A trailer control valve (300) for a towing vehicle of a trailer is disclosed. The trailer control valve (300) comprising a pneumatic input port (310) for receiving a control pressure (101); an electronic input port (320) for receiving an electronic brake signal (150); a pressure sensor (330); a relay valve relay valve (340) with a control port (345); a first solenoid valve (350) and a second solenoid valve (360); a pressure supply port (370); and a trailer coupling terminal (380) for providing a brake pressure and / or a supply pressure to the trailer. The first solenoid valve (350) and the second solenoid valve (360) are arranged to forward, in a primary mode, the control pressure (101) to the control port (345) of the relay valve, and to interrupt, in a secondary mode, the control pressure and to connect the control port of the relay valve to the pressure supply port.

The utility model discloses an air brake system of a wide-body mining dump truck in the technical field of wide-body mining dump trucks. The air brake system comprises an air supply assembly. The air cylinder assembly comprises a first air cylinder, a second air cylinder and a third air cylinder; the brake valve assembly comprises a front axle relay valve, a middle axle relay valve, a rear axle relay valve and a differential relay valve; the brake chambers comprise a front axle brake chamber, a middle axle brake chamber and a rear axle brake chamber; the brake control piece comprises a foot valve and a hand valve; wherein the first air cylinder and the second air cylinder are communicated with front axle, middle axle and rear axle relay valve control ports through foot valves, and are communicated with front axle, middle axle and rear axle brake chamber running ports through front axle, middle axle and rear axle relay valves; and the third air cylinder is communicated with a differential relay valve control port through a hand valve and is connected with parking ports of brake chambers of the front axle, the middle axle and the rear axle through the differential relay valve. The pneumatic braking system adopts a pneumatic control mode to form a reliable braking system, so that the braking reliability of the wide-body mining dump truck is effectively improved, and the braking safety of the whole truck is improved.

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.