912 results about "Brake fluid" patented technology

The invention relates to a vehicle brake-by-wire method and system, and relates to the technical field of brake-by-wire, and the method comprises the steps: obtaining environment information around a vehicle and vehicle attitude information; identifying road conditions based on the environment information and obtaining dynamic parameters of the vehicle based on the vehicle attitude information and a vehicle dynamics model; obtaining a vehicle state evaluation result based on the identified road condition and the vehicle dynamic parameters; the vehicle state evaluation result is obtained based on the driving state and the potential risk of the vehicle under the current road condition; determining a braking force distribution proportion and an adjustment amount of each wheel by using a braking force distribution matrix and a braking force adjustment algorithm based on the vehicle state evaluation result; and adjusting the brake fluid pressure of each wheel based on the determined brake force distribution ratio and adjustment amount of each wheel.

The invention discloses an elevator travel limiting monitoring management system, which relates to the technical field of travel limiting management monitoring and comprises a travel detection module, an intelligent monitoring device, a limiting judgment module, an execution control module and a remote monitoring platform. According to the method, the laser measurement and standard gauge composite calibration technology is adopted, the stroke detection precision is improved through the optical fiber synchronization and dynamic error compensation unit, the fault pre-judgment accuracy is further improved by combining the abnormal mode recognition model constructed by the convolutional neural network, and the fault prediction accuracy is further improved through the three-level risk instruction grading response strategy. Under electromagnetic braking, hydraulic buffering and mechanical band-type braking triple-combination braking, the accident response time is shortened, three-dimensional visual reconstruction of the elevator running state is achieved by means of a digital twin platform constructed through a 5G network, full-life-cycle data of equipment are completely traced in cooperation with a block chain evidence storage device, the preventive maintenance efficiency is improved, and the safety and reliability of the equipment are improved. And therefore, the elevator operation safety and the intelligent monitoring accuracy are obviously improved.

The invention relates to the technical field of automobile brake fluid production, and discloses an automobile brake fluid production stirring device which comprises a vibration crushing mechanism, a circulation backflow mechanism is arranged on the surface of the vibration crushing mechanism, and a stirring storage mechanism is arranged on the surface of the circulation backflow mechanism. A vibration driving mechanism is arranged at the top of the stirring and storing mechanism, and a stirring and mixing mechanism is arranged between the vibration driving mechanism and the stirring and storing mechanism. According to the stirring device for producing the automobile brake fluid, through the arrangement of the vibration crushing mechanism, the circulating reflux mechanism, the stirring storage mechanism, the vibration driving mechanism and the stirring mixing mechanism, materials below can be continuously and circularly pumped upwards through the circulating reflux mechanism during use, and continuous vibration is generated through the vibration crushing mechanism; and the clotted raw materials are crushed and mixed through vibration of the vibration crushing mechanism, so that the material mixing uniformity is improved.

The invention discloses a safety braking hydraulic system for a main elevator of a ship lift and a control method. The hydraulic system comprises an oil tank, a first motor pump set, a second motor pump set, a first high-pressure filter, a second high-pressure filter, a first one-way valve, a second one-way valve, a pressure gauge, a first pressure sensor, an energy accumulator, a stop valve, an oil return filter, a safety brake module and a working brake module. A safety brake loop is provided with a two-way cartridge valve and an electromagnetic directional valve, quick response and brake loosening and locking synchronization are achieved, a working brake loop is provided with an overflow valve and a proportional overflow valve, the proportional overflow valve, a PLC, a third pressure sensor and a speed encoder form a closed-loop system, the voltage of the proportional overflow valve is accurately adjusted according to oil pressure and speed, and the safety brake loop is controlled. The braking torque is timely controlled, stable braking is guaranteed, potential safety hazards such as poor synchronism and uncontrollable braking of a traditional hydraulic system can be eliminated, and safe operation of the main elevator is guaranteed.

The invention discloses a drive-by-wire system with redundancy safety, which is applied to engineering machinery and is characterized by comprising a redundancy steering module, a redundancy braking module and a control module, the redundant steering module is used for limiting the number of turns of a steering wheel of the vehicle through a limiting unit and carrying out simulation feedback on road feel by arranging a resistance feedback unit; and the redundant braking module is used for carrying out three-in-one combined braking of electric braking, hydraulic service braking and parking braking on a braking system of the vehicle. The device is compact in structure, safe, reliable and convenient to control, steering limiting and motor resistance torque increasing are adopted, and the steering performance of the drive-by-wire chassis can be guaranteed; meanwhile, a redundant design of an angle sensor and a displacement sensor of the steering oil cylinder is adopted, so that the steering safety is ensured; the safety redundancy design of service braking, parking braking and electric braking is adopted, and the safety of service braking and parking braking is guaranteed; and the driving safety of the drive-by-wire chassis is ensured.

The invention discloses an electronic brake booster rollback fluid infusion method and system and an automobile, and the method comprises the steps that in the braking process, a pressure buildup unit is controlled to build brake pressure for a wheel end brake cylinder; acquiring a liquid quantity state of a brake system; the liquid quantity state of the braking system comprises the braking demand liquid quantity V1 needing to be consumed by a brake cylinder at the wheel end after braking during current driving, the maximum effective braking liquid quantity V2 capable of being provided by the braking system after braking during current driving and the total consumed liquid quantity V3 when the braking intention of a driver is reached after braking during current driving; determining whether the liquid quantity state of the brake system meets a liquid supplementing condition or not; and if yes, the pressure buildup unit is controlled to obtain the brake fluid from the brake fluid storage pot. According to the system, it can be ensured that enough liquid amount exists in the system to support pressure building, the situation that after the ABS function of a vehicle is activated, the brake liquid amount in the pressure building unit is not enough to continue to support the brake requirement of the next cycle is prevented, and the time of returning and liquid supplementing of the brake system can be accurately recognized.

An integrated brake fluid charging valve, a hydraulic system and an engineering machine. The integrated brake fluid charging valve comprises: a priority valve, a fluid charging pressure control valve, a first one-way valve, a second one-way valve, a proportional overflow valve and a pressure oil port, a first oil outlet, a second oil outlet, a third oil outlet and an oil return port. The pressure oil port is in fluid connection with the first oil outlet and the second oil outlet by means of the first one-way valve. The fluid charging pressure control valve is arranged between an oil inlet of the first one-way valve and the oil return port, and the priority valve and the proportional overflow valve are arranged in series between the pressure oil port and the oil return port. The second one-way valve is arranged between the priority valve and the third oil outlet. At least part of a hydraulic fluid input through the pressure oil port can be guided to the third oil outlet by means of the priority valve and the second one-way valve, and / or can be guided to the oil return port by means of the priority valve and the proportional overflow valve. The hydraulic system comprising the integrated brake fluid charging valve and the engineering machine are also provided. Integrating functions such as brake accumulator fluid charging, parking brake control and pilot oil supply into one valve block achieves an integrated design, thus reducing the difficulty and complexity of arrangement of hydraulic systems, and reducing system costs.

The application discloses a damping-adjustable hydraulic bushing and a control method thereof. The damping-adjustable hydraulic bushing is composed of a hydraulic bushing body and a solenoid valve. The hydraulic bushing body comprises a bushing support, a main spring rubber, a cast aluminum inner tube, an aluminum outer tube and a cage-shaped framework. The cast aluminum inner tube, the main spring rubber and the aluminum outer tube are coaxially arranged from inside to outside. The cage-shaped framework is arranged in the main spring rubber and used for supporting the main spring rubber. Two flow channel plates are assembled between the aluminum outer tube and the main spring rubber, so that a brake liquid chamber and an acceleration liquid chamber are formed between the main spring rubber and the flow channel plates respectively. A brake flow channel on the brake side flow channel plate cooperates with an acceleration flow channel on the acceleration side flow channel plate to form a passage. A connecting bridge is arranged on the cage-shaped framework. The solenoid valve is connected to the connecting bridge through bolts. An axial actuating hole is arranged on the cage-shaped framework. An actuating rod is arranged in the axial actuating hole and controlled by the solenoid valve.

In order to test a function in a pressure generating module of a hydraulic vehicle power brake system, it is provided to generate a brake pressure using a power brake pressure generator and subsequently hydraulically to separate a pressure regulating module from the pressure generating module by closing connection valves or hydraulically to separate wheel brakes from the pressure generating module by closing inlet valves, so that no brake fluid flows into the wheel brakes during the function test, which would reduce the brake pressure in the pressure generating module and negatively affect or prevent the function test.

The embodiment of the invention provides a vehicle braking control method and device.The vehicle braking control method comprises the steps that vehicle operation parameters of a running vehicle are obtained and subjected to weighted fusion processing, and a dynamic working condition index is generated; acquiring a real-time driving signal of a current driver in a sliding window at preset time and importing the real-time driving signal into a preset driving intention prediction model to generate a driving intention type; according to the dynamic working condition index and the driving intention type, the braking force demand level of each wheel cylinder is determined; and the brake oil quantity of each wheel cylinder is adjusted based on the brake force demand level so as to adjust the brake condition of the vehicle, and the brake oil quantity of each wheel cylinder is corrected in real time according to the obtained feedback signal. According to the method, accurate matching of brake pressure distribution and vehicle dynamic characteristics can be achieved, front and rear shaft brake torque distribution is effectively balanced under the curve brake working condition, the response time from driving intention recognition to pressure adjustment execution is shortened, and the coordination control capacity of a brake system is improved under the sudden avoidance scene.

The application discloses a brake fluid filling and exhaust device and a control method and system thereof. The device comprises a liquid supplement tank, a liquid supplement pipeline, a liquid return pipeline, a first valve and a second valve. The liquid supplement tank is internally provided with a filter, the top of the tank body is provided with an exhaust port, one side of the tank body is connected with the liquid supplement pipeline, the liquid supplement pipeline is provided with the first valve, the other side of the tank body is connected with the liquid return pipeline, and the liquid return pipeline is provided with the second valve. When brake fluid is filled, the liquid supplement tank, the liquid supplement pipeline, a liquid storage pot, brake calipers and the liquid return pipeline are communicated to form a circulating passage of brake fluid, and when a stop-filling condition is met, the liquid storage pot stops filling brake fluid to the brake calipers, and the stop-filling condition at least comprises that gas in the brake system is exhausted. Through the technical scheme provided by the application, gas in brake fluid can be filtered, separated and exhausted from the exhaust port in the brake fluid circulation process, automatic filling and exhaust of brake fluid are realized, and the filling and exhaust efficiency of brake fluid is improved.

A control method and a control apparatus. The control method comprises: acquiring an electric braking parameter determined on the basis of a driving state of a vehicle, wherein when the vehicle is in an energy recovery state, a braking force of the vehicle is provided by an electric brake mechanism on the basis of the electric braking parameter; and, when the vehicle exits the energy recovery state due to triggering a stability control function, controlling, on the basis of the electric braking parameter, an active pressurization module to build a corresponding braking hydraulic pressure in a brake wheel cylinder. The control method can be used for intelligent automobiles or new energy vehicles, and, when a vehicle exits an energy recovery state due to triggering a stability control function, can prevent unintended acceleration caused by the exiting from energy recovery, thereby ensuring the driving safety of vehicles.

A control device and method for a braking system. The method includes reading out or checking, based on at least one signal, whether a predefined error state exists at a brake-actuation hydraulic unit, which is mounted on an ESC hydraulic unit, and performing at least one of the following steps if it is determined that the at least one predefined error state exists at the brake-actuation hydraulic unit: activating at least one pump of the ESC hydraulic unit in order to draw in a firmly predefined or specified brake fluid volume from a brake fluid reservoir of the braking system, and / or controlling at least one electric motor of the vehicle which can be operated in a regenerative mode, to effect a firmly predefined or specified motor braking torque not equal to zero at at least one wheel of the vehicle and / or at least one axle of the vehicle.

The invention provides a hydraulic brake system which comprises an oil can, a brake master cylinder, a pedal simulator, an electric supercharging device, a wheel brake unit, a brake pedal, a control unit and a backflow oil way, the two ends of the backflow oil way are connected with the oil can and a hydraulic cavity of the brake master cylinder respectively, and a backflow valve is arranged on the backflow oil way; the control unit is connected with the return valve and used for controlling opening and closing of the return valve according to the braking efficiency of the vehicle braking device during braking. When the backflow valve is opened, brake fluid in the hydraulic cavity of the brake master cylinder can flow back to the oil can through the backflow oil way. The hydraulic brake system can increase the stroke of the brake pedal when the brake efficiency of the vehicle brake device is attenuated, so that a driver can sense the attenuation of the brake efficiency. The invention further provides a vehicle.

The utility model relates to a brake pedal simulator, a piston of the brake pedal simulator, a brake assembly and a vehicle, and the piston (10) is provided with a body part (1000) and an overflowing structure arranged on the body part (1000) so as to communicate the outside with an inner cavity of the body part (1000). The overflowing structure is designed on the piston, brake fluid in the inner cavity of the piston can directly flow out through the overflowing structure on the piston, and smooth oil outlet is guaranteed; in addition, during oil return, the brake fluid in the overflowing channel can directly flow back into the inner cavity of the piston, the flowing path is shortened, backflow is faster, oil returns in the inner cavity of the cover body and the inner cavity of the piston at the same time, and the oil return efficiency is further improved.

The present application provides a vehicle control method and system in an emergency braking scenario. This method dynamically adjusts the target slip rate range by establishing a data set of the optimal slip rate under different road surface conditions and combining a digital model to simulate the contact characteristics between the tire and the road surface; collects vehicle motion state data, analyzes the mutation characteristics and the changing trend of the tire force, and generates a warning signal; inputs the target slip rate range and the warning signal into a predictive control model, calculates the braking force of each wheel and generates a control instruction; uses a digital tire model to simulate the expected slip state, and determines the pressure control value with reference to the friction force change law; corrects the model parameters and adjusts the pressure control value by comparing the actual measurement with the simulation result and combining the pressure change rate of the brake hydraulic system, so as to realize the automatic adjustment of the braking force. The technical solution provided by the present application significantly improves the stability and safety of the vehicle in an emergency braking situation.

The invention relates to the technical field of automatic production and detection equipment for automobile brake oil can floaters, and discloses automatic production and detection equipment for automobile brake oil can floaters, which comprises a mounting floor, and a first mechanical arm is fixedly connected above the mounting floor. According to the automatic production and detection equipment for the automobile brake oil can floaters, through the arrangement of the first mechanical arm, manual magnet grabbing can be replaced for production of floater bodies, the produced floater bodies are transferred to the next working procedure, personnel safety is protected, continuous work can be achieved, the production efficiency is improved, and the production cost is reduced. Through the arrangement of the feeding box, automatic feeding can be achieved, manual operation is saved, the production cost is reduced, through the arrangement of the positioning platform, the floater body can be positioned, the second mechanical arm can conveniently grab the floater body for detection, the working precision is improved, through the arrangement of the second mechanical arm, the floater body can be automatically detected and classified, the classification accuracy is improved, and the working efficiency is improved. And the finished product quality is improved.

A valve unit for an anti-lock braking system has a valve body, a piston, and an elastic element acting on the piston. The valve body has an outlet port, an inlet port, a primary chamber communicating with the outlet port, an expansion chamber with an outflow passage establishing fluid communication between the primary chamber and the expansion chamber, and a bypass passage between the inlet port and the outlet port. The piston is movable in the primary chamber and has a longitudinal through cavity, a first transversal surface facing the outlet port, and a second transversal surface facing away from the outlet port. The first transversal surface has an area smaller than the area of the second transversal surface. The elastic element exerts an elastic force to move the piston away from the outlet port. The valve unit is activatable by pressure of a brake fluid in the primary chamber.

Proposed is an electro-hydraulic brake device including a main brake unit configured to provide a braking fluid to a plurality of wheel cylinders by driving a motor, a storage unit connected to the main brake unit, and configured to store the braking fluid, an auxiliary brake unit configured to provide the braking fluid to one or more of the wheel cylinders when an operational failure of the main brake unit occurs, and configured to divide a hydraulic line of a hydraulic circuit unit physically by a function, wherein the hydraulic circuit unit disposed at a block unit is connected to the main brake unit and the storage unit.

The invention relates to the field of motorcycle braking systems, and discloses a motor-free motorcycle ABS system and a control method, the motor-free motorcycle ABS system comprises a negative pressure generation unit, a hand brake unit and a return valve; the system further comprises a pressure increasing valve, a pressure reducing valve, an energy accumulator and a braking unit. The hand brake unit is connected with the negative pressure generation unit, the hand brake unit comprises a main cylinder, the main cylinder provides high-pressure brake fluid for an ABS system, the main cylinder is connected with two oil ways, one oil way is communicated with an energy accumulator, the other oil way is communicated with the brake unit through a pressure increasing valve, and the other end of the negative pressure generation unit is connected with a return valve; the reflux valve is connected with the reducing valve; the pressure reducing valve and the pressure increasing valve are connected in parallel and then connected with the brake unit; the energy accumulator is connected between the hand brake unit and the pressure increasing valve through the one-way valve, and the energy accumulator is connected with the return valve and the pressure reducing valve. The brake system has the advantages of low cost, reliability in use and the like.

The invention discloses a motorcycle ABS performance detection method, system and device and a medium, and relates to motorcycle ABS detection. According to the method, the brake fluid is subjected to dewatering and degassing treatment, and target brake fluid is obtained; establishing an instruction transmission channel; the brake pipeline is subjected to air exhaust operation, and the negative pressure establishment rate and the dwell pressure attenuation rate are measured; judging whether the sealing performance of the brake pipeline reaches the standard or not; if the sealing performance reaches the standard, target brake fluid is injected into the hydraulic loop in an excessive injection mode of the preset target liquid level amount, and after injection is completed, the target brake fluid is controlled to reach the preset liquid level height through a back suction device; and a brake pressure release instruction is sent to the hydraulic device through the instruction transmission channel, and after the hydraulic device drives the brake device to complete brake operation of a preset number of rounds according to the brake pressure release instruction, a detection result is obtained according to the position change of the brake device. By implementing the scheme, the performance of the ABS system can be effectively detected, and the ABS system can be effectively controlled.

The invention provides a hydraulic braking system diagnosis method and device, electronic equipment and a storage medium, and the hydraulic braking system diagnosis method comprises the steps that in the vehicle braking process, target pressure corresponding to a main cylinder of a hydraulic braking system is obtained; when the main cylinder starts to build pressure, the pressure in the main cylinder is monitored, and pressure change information is obtained; according to the pressure change information and the target pressure, whether the residual gas in the main cylinder exceeds a target threshold value or not is judged; and when the target threshold value is exceeded, outputting a fault reminding signal. Whether the residual gas in the main cylinder exceeds the threshold value or not is determined according to the target pressure and the pressure change information of the main cylinder in the vehicle braking process, and when the target threshold value is exceeded, the fault reminding signal is output to remind a user to overhaul the vehicle, so that the situation that the vehicle is overhauled after the brake fluid is manually injected under the vacuum-free injection condition can be avoided. And the problem that the braking performance of the vehicle is reduced due to inaccurate subjective judgment on the residual gas quantity is solved, so that the safety performance of the vehicle is improved.

A method of operating a vehicle brake system having multiple wheel brakes includes providing a plunger assembly having a plunger and a chamber fluidly connected to at least one of the wheel brakes. An evacuation of at least one of the wheel brakes is performed by moving the plunger relative to the chamber under control of an electronic control unit (ECU) to generate a vacuum from the chamber to the at least one wheel brake. Pressurized brake fluid is supplied from a reservoir to the evacuated wheel brakes by moving the plunger relative to the chamber under control of the ECU once all the wheel brakes are evacuated.

The utility model provides a trailer braking hydraulic system and a tractor trailer braking system, the trailer braking hydraulic system comprises a trailer braking oil cylinder, an energy accumulator and a reversing valve, an inlet of the reversing valve is connected with a braking oil source pipeline, a first outlet of the reversing valve is connected with the trailer braking oil cylinder, and a second outlet of the reversing valve is connected with the energy accumulator; a switch oil way and a release oil way are arranged between the trailer brake oil cylinder and the energy accumulator, and when the switch oil way is opened, oil in the energy accumulator can enter the trailer brake oil cylinder through the switch oil way. A releasing pump is arranged on the releasing oil way and can be used for pumping oil in the trailer brake oil cylinder into the energy accumulator. According to the trailer braking system, oil is supplied to the energy accumulator and the trailer braking oil cylinder through the reversing valve, and vehicle-mounted braking of a trailer is achieved; by operating the reversing valve, the switch oil way and the release pump, quick switching between vehicle-mounted braking and independent braking of the trailer is achieved, operation is convenient, and the safety of the trailer is improved.

The invention relates to the field of lubricating oil, and discloses a brake fluid composition as well as a preparation method and application thereof, the brake fluid composition comprises boric acid ester, polyol ether, an antioxidant, a corrosion inhibitor, a metal deactivator and a pH regulator; the mass ratio of the boric acid ester to the polyalcohol ether to the antioxidant to the corrosion inhibitor to the metal deactivator to the pH regulator is (30 to 90) to (4 to 60) to (0.05 to 3.5) to (0.05 to 2.5) to (0.05 to 1) to (0.2 to 5). The brake fluid composition disclosed by the invention has excellent high-temperature performance, lubricating performance, low-temperature performance, viscosity-temperature performance, corrosion resistance and rubber matching performance, provides good functions of energy transfer, lubrication, sealing, corrosion and rust prevention and heat dissipation for an overrun brake system, and meets the use requirements of a racing track vehicle brake system under severe conditions; and a guarantee is provided for reliable operation of a braking system.

To inhibit vibration of a vehicle body caused by operation of a pump.SOLUTION: A brake system 20 includes a brake pipe 50 which is connected to a brake actuator 40 and a friction brake 30 and in which a brake fluid discharged from a pump 42 of the brake actuator 40 flows. The brake pipe 50 has: a metal pipe 51 connected to the brake actuator 40; and a flexible hose 55 for guiding the brake fluid flowing in the metal pipe 51 to a wheel cylinder 31 of the friction brake 30. A processing circuit 71 of a brake control device 70 increases the rotation number of an electric motor 41 serving as a power source of the pump 42 as a time period that a temperature of the flexible hose 55 is high becomes longer based on heat history of the flexible hose 55.SELECTED DRAWING: Figure 1

A method of operating a vehicle brake system having multiple wheel brakes includes providing a plunger assembly having a plunger and a chamber fluidly connected to at least one of the wheel brakes. An evacuation of at least one of the wheel brakes is performed by moving the plunger relative to the chamber under control of an electronic control unit (ECU) to generate a vacuum from the chamber to the at least one wheel brake. Pressurized brake fluid is supplied from a reservoir to the evacuated wheel brakes by moving the plunger relative to the chamber under control of the ECU once all the wheel brakes are evacuated.

The invention provides a hydraulic trailer braking system and a hydraulic trailer braking control method.The hydraulic trailer braking system comprises a pressure oil pipeline, an oil return pipeline, a parking braking hydraulic unit and a traveling braking hydraulic unit; a pressure oil port of the parking brake hydraulic unit and a pressure oil port of the service brake hydraulic unit are respectively connected with a pressure oil pipeline, and an oil return port of the parking brake hydraulic unit and an oil return port of the service brake hydraulic unit are respectively connected with an oil return pipeline; the parking brake hydraulic unit is provided with a parking release oil connector, and the service brake hydraulic unit is provided with a service brake oil connector. According to the invention, the driving, parking and braking comprehensive control of the trailer is realized; when the service braking pipeline is broken, parking braking can be switched; when the parking braking pipeline is broken, parking and driving double braking are carried out; the reliability and the safety coefficient of trailer brake control are improved; emergency parking braking and parking driving double braking can be switched according to different speeds per hour.

The invention discloses an automatic running control method for a tamping wagon, which comprises the following steps of: S10) controlling a cart to establish a low-constant-speed running state under a continuous tamping running working condition; s11) controlling the trolley to accelerate from the rear position to establish a low constant speed operation state; s12) calculating the braking conversion point distance of the trolley; s13) after the trolley moves to a braking conversion point, applying a braking hydraulic force for braking until the low constant speed of the trolley and the trolley is established; s14) double-closed-loop PI control based on the position and the speed is carried out on the trolley; and in each tamping period, the trolley periodically pursues the cart from the rear position and advances to a brake switching point, then decelerates to keep uniform motion with the cart, and ensures that the whole walking duration is within the set time. The technical problem that an existing tamping wagon walking control mode is low in automation degree and operation efficiency can be solved.

The invention discloses an automatic braking device for trailer rod falling, and relates to the technical field of vehicle braking control devices. The automatic braking device for the trailer falling rod comprises a braking handle, the braking handle is tensioned, an energy storage spring is in a compressed energy storage state, when a trailer traction rod is unhooked and falls, an inhaul cable can be pulled, a rotary shifting fork is driven to bounce and loosen the braking handle upwards, the energy storage spring releases elastic force, and a master cylinder shifting fork is pushed to rotate through a main pull rod; a master cylinder push rod is pressed to a brake master cylinder, brake hydraulic pressure generated by the brake master cylinder is output to a wheel brake of an axle through a pipeline, brake force is generated, the trailer is braked and stopped, automatic brake of the trailer is achieved when the trailer unhooks accidentally, and the trailer can be effectively prevented from colliding with people and facilities due to inertia loss control. Adjustment is carried out through preset spring pre-tightening force, and the requirement for braking force of a large-tonnage trailer is met.