371results about "Aerodynamic brakes" patented technology

The invention discloses an intelligent detection and alarm system for an urban rail vehicle, relates to the technical field of rail transit and transportation, and solves the technical problems that an existing monitoring method is difficult to accurately monitor various pressures in the running process of a train, so that the early warning effect is poor, and the safety of the train in the running process is reduced. The data acquisition module is used for acquiring train driving information, voltage data and pressure data according to an acquisition signal; the data processing module is used for generating an early warning pressure range according to the train driving information; generating a pressure alarm signal according to the early warning pressure range and the pressure of the pressure tank, the pressure of the brake pipe and the pressure of the brake cylinder in the pressure data; generating an acquisition signal according to the early warning pressure range, the pressure data and the voltage data; the voltage early warning module is used for generating a voltage alarm signal according to the voltage data; an alarm is given according to the voltage alarm signal; the wind pressure early warning module is used for giving an alarm according to the pressure alarm signal; and the safety of the train in the running process is improved.

The bogie weighing device comprises a weighing valve and a force transmission mechanism, an air inlet of the weighing valve is communicated with an auxiliary air cylinder, an air outlet of the weighing valve is communicated with a distribution valve in a vehicle braking system, the weighing valve is fixed to a framework of a vehicle bogie, and the force transmission mechanism is connected with the framework and can rotate around a connecting point. One end of the force transmission mechanism is connected with the weighing valve, and the other end of the force transmission mechanism is connected with the hanging bracket. Stepless regulation of vehicle braking can be achieved.

The invention discloses a pressure-limiting valve seat, a pressure-limiting valve assembly, a valve group module and an air braking system. The pressure-limiting valve seat comprises a valve seat base body, and the valve seat base body is provided with a first valve cavity, a second valve cavity and a third valve cavity which are independent of one another; the brake cylinder interface and the sensing valve lower cavity interface are communicated with the first valve cavity, the pressure reduction air cylinder interface and the sensing valve upper cavity interface are communicated with the second valve cavity, and the control valve interface is communicated with the third valve cavity; the valve seat base body is further provided with a pressure limiting valve connector used for being connected with a pressure limiting valve, and the pressure limiting valve connector communicates with the first valve cavity, the second valve cavity and the third valve cavity in a one-to-one correspondence mode. The brake cylinder connector, the sensing valve lower cavity connector and one of the pressure limiting valve connectors communicate with the first valve cavity, so that when a corresponding valve port of the pressure limiting valve communicates with the pressure limiting valve connector, the pressure limiting valve can communicate with the brake cylinder connector and the sensing valve lower cavity connector at the same time through the first valve cavity; therefore, the pressure limiting valve can be communicated with the brake cylinder and the sensing valve lower cavity of the sensing valve at the same time.

The invention relates to a motor train unit vehicle brake control system which comprises a brake control device, a working air cylinder, an auxiliary air cylinder, an air brake valve and an electric pneumatic control module, and the electric pneumatic control module comprises an electronic brake control unit, an electric pneumatic valve, a switching valve, an intercepting valve and a two-way valve and further comprises a pressure reducing valve and a relay valve. The system can be switched between electro-pneumatic braking and air braking, and pre-control pressure is transmitted to the relay valve through the two-way valve. Two braking control modes of automatic air braking and straight-through type electric pneumatic braking are integrated, electric pneumatic braking serves as a main braking mode, automatic braking is hot standby redundancy, the reliability of the braking effect is improved, and it is ensured that a motor train unit runs safely.

The invention belongs to the technical field of rail transit vehicles, and particularly relates to a parking brake module for a locomotive and a control method. According to the technical scheme, the parking brake module for the locomotive comprises a two-way valve, the two inlet ends of the two-way valve are connected with a main blast pipe gas circuit and a train pipe gas circuit respectively, the main blast pipe gas circuit is connected with a main blast pipe cock, the train pipe gas circuit is connected with a train pipe cock, and an air outlet of the two-way valve is connected with an air inlet gas circuit. The other end of the air inlet air channel is connected with a brake air channel, the brake air channel is sequentially connected with a pressure reducing valve and a parking brake electric control valve, the outlet end of the brake air channel is connected with a front bogie parking brake pipe air channel and a rear bogie parking brake pipe air channel, and the front bogie parking brake pipe air channel is connected with a front bogie parking brake cock. And the rear bogie parking brake pipe gas circuit is connected with a rear bogie parking brake cock. The invention provides a parking brake module for a locomotive and a control method.

The invention relates to the field of power concentration motor train units, and provides an air compressor air path protection and logic protection device and method, an air path outlet of a first air compressor is connected with a first one-way valve, and an air path outlet of a second air compressor is connected with a second one-way valve; the first air compressor high-temperature protection switch, the first air compressor high-pressure protection switch, the second air compressor high-temperature protection switch and the second air compressor high-pressure protection switch are connected to a motor vehicle microcomputer in parallel through circuits. According to the invention, gas circuit protection and microcomputer control protection are used for double protection in the aspects of circuits and gas circuits, so that the fault range is reduced to the minimum in time; the fault occurrence probability is reduced by using different logic measures; secondary disasters caused by faults of the air compressor are reduced through logic protection; finally, the redundant function of the air compressor is fully played, and the influence on application after the air compressor breaks down is reduced to the maximum extent.

The present invention discloses a vehicle electro-pneumatic brake control device, comprising a switch solenoid valve connected to a train pipe through a C port, an A pneumatic plunger valve connected to a B port of an A switch solenoid valve through a D port, a relay valve connected to an E port of an A pneumatic plunger valve in an upper space of a diaphragm, and a pre-control chamber arranged in an intermediate body and connected to an upper space of the diaphragm; the lower space of the relay valve diaphragm is connected to the train pipe; the F port of an A pneumatic plunger valve is connected to a C port of an A switch solenoid valve; the pre-control chamber is connected to an outlet capable of discharging pressurized air; and a normally closed exhaust valve is arranged in the lower space of the relay valve diaphragm. The beneficial effects of the present invention are as follows: the present scheme utilizes a switch solenoid valve to execute an electric control signal to make the train pipe of the rear vehicle in the train follow the front vehicle as soon as possible, thereby improving the consistency of the braking force change of the train vehicle, reducing the impact force between vehicles inside the train, reducing the damage to the locomotive vehicle and the line during the train braking process, and improving the controllability and application safety of the train.

The invention discloses a special inspection vehicle for track detection, which comprises an inspection vehicle body, a detection device arranged on the inspection vehicle body and a driving device, the driving device comprises a power frame fixed on the inspection vehicle body and a plurality of driving wheels rotationally connected to the power frame, the plurality of driving wheels are divided into two groups, and the two groups of driving wheels are arranged on two sides of the inspection vehicle body; a synchronizing shaft is fixed between the corresponding travelling wheels of the two groups of travelling wheels, and a driving piece for driving the synchronizing shaft to rotate is arranged on the power frame; a braking mechanism is arranged on the power frame and comprises a braking oil cylinder and a braking block which are fixed to the power frame, a supporting part is arranged on the power frame, the middle of the braking block is hinged to the supporting part, and one end of the braking block is hinged to the driving end of the braking oil cylinder. The end, away from the brake oil cylinder, of the brake block can be close to and abut against the traveling wheels and / or the synchronizing shaft. According to the invention, automation and intellectualization of the inspection process are realized, manual inspection can be replaced in environments of severe weather such as rain and snow, and the efficiency of track inspection is greatly improved; and meanwhile, the system can adapt to track inspection and accurate positioning of mountain landforms, the accuracy of track inspection is improved, and the safety of inspection personnel and equipment can be protected.

The utility model is suitable for the technical field of rubber-tyred vehicle stoppers, and provides an automatic rubber-tyred vehicle stopper which comprises a rubber-tyred vehicle body, a controller is installed in a cab of the rubber-tyred vehicle body, and an air storage bag is arranged on one side of the rear end of the rubber-tyred vehicle body; car arrester assemblies are arranged at the positions, close to rear wheels on the two sides, of the rear end of the rubber-tyred vehicle body; the two car arrester assemblies comprise first air cylinders detachably and fixedly connected to the bottom of the air storage bag and the bottom of the lower side of the rear end of the rubber-tyred vehicle body, the telescopic ends of the two first air cylinders are fixedly connected with connecting blocks correspondingly, and the two first air cylinders are electrically connected with the air storage bag and the controller. According to the device, manual operation links are reduced to a great extent, the transportation safety coefficient of the rubber-tyred vehicle is improved, a car arrester assembly can be started and controlled to be automatically arranged at a designated position through one key under the condition that a driver and passengers do not leave a cab, and the safety management level and the intelligent operation level of underground transportation are greatly improved.

The invention relates to a railway transportation system, and provides a brake system sensor for a railway tank car and a railway tank car operation monitoring system in order to solve the problem that the fusion level of an existing railway tank car system and a modern digital technology is low, the brake system sensor comprises a brake cylinder push rod displacement sensor, a brake cylinder pressure sensor, a main pipe pressure sensor and an air storage cylinder pressure sensor; the brake cylinder push rod displacement sensor is arranged between the brake cylinder and the brake cylinder push rod; the brake cylinder pressure sensor is arranged on a ventilation pipeline for connecting the brake pressure limiting valve and the brake cylinder; the main pipe pressure sensor is arranged on a flange joint of a braking main pipe of the railway tank car; the air storage cylinder pressure sensor is arranged on a ventilation pipeline between the air storage cylinder of the railway tank car and the connecting valve; the invention further provides a railway tank car operation monitoring system adopting the brake system sensor, operation data information of a railway tank car is monitored in real time, and a user can know the operation state of the railway tank car timely and conveniently.

The present application provides an air supply control system, method, device and medium for a rail vehicle, wherein the air supply control system includes a control module, an air supply module and an air cylinder module, wherein the control module is used to generate an air supply instruction based on the pressure value collected in the air cylinder module and send the air supply instruction to the air supply module; the air supply module is used to receive the air supply instruction and, based on the air supply instruction, provide compressed air to the air cylinder module to increase the pressure value in the air cylinder module to provide working air to the pneumatic flow receiving device and the brake system. According to the system and method, the air supply instruction is sent to the air supply module through the control module, and the air supply module supplies air to the pneumatic flow receiving device or the brake system, thereby enabling the pneumatic flow receiving device and the brake system to operate normally and ensuring the normal use of the pneumatic flow receiving device and the brake system.

The invention provides an adjustable pneumatic brake and an adjusting method, and relates to the technical field of brakes, the adjustable pneumatic brake comprises a box body, a power executing mechanism, a brake arm and a force amplifying mechanism, the power executing mechanism comprises an air cylinder and an elastic energy storage assembly, and the elastic energy storage assembly comprises a disc spring shaft, a disc spring set and a shaft seat; the disc spring shaft is connected with the air cylinder piston rod and penetrates through the shaft seat, and the disc spring set is sleeved at the tail end of the disc spring shaft. And two groups of symmetrically arranged brake arms are hinged in the box body, and one ends extend out of the bottom of the box body. The force amplifying mechanism comprises a connector, an adjustable connecting rod and an adjusting structure, the connector is fixed to the tail end of the disc spring shaft, and the two ends of the adjustable connecting rod are hinged to the connector and the brake arm respectively. When the air cylinder drives, the disc spring set is compressed to open the brake arm, and when pressure is released, the disc spring set drives the brake arm to clamp through the force amplifying mechanism. A force transmission path is adjusted through a mechanical structure, the adjusting range is expanded while the structural stability is kept, the braking force can be dynamically adjusted according to the friction coefficient, and the problem that the adjusting range of a traditional pneumatic brake is insufficient is solved.

The present invention discloses an integrated braking system and working method for a railway freight car, which solves the problem of scattered distribution of the braking system in the prior art and has the beneficial effects of realizing integrated installation, convenient installation and maintenance. The specific scheme is as follows: An integrated braking system for a railway freight car, comprising an air brake module, the air brake module is located on one side of a basic brake module, the air brake module and the basic brake module are arranged side by side, the air brake module comprises a brake module hanger that can be installed on a frame, the brake module hanger supports a brake air cylinder and a distribution valve on a side away from the frame, the brake air cylinder is connected to the distribution valve, a first branch pipe of the distribution valve is connected to a train pipeline, a second branch pipe of the distribution valve is connected to the basic brake module through a multi-way joint, the multi-way joint is also connected to an empty-load vehicle conversion device to realize the connection between the basic brake module and the empty-load vehicle conversion device, the distribution valve is located on the outside of the brake module hanger, and the brake air cylinder is located on the inside of the brake module hanger.

The invention discloses a method for realizing a brake cylinder pressure conversion function, which relates to the technical field of railway transportation and comprises the step of integrating a stepless relay valve and a brake cylinder pressure conversion device into a whole, the brake cylinder pressure conversion device comprises a pressure regulating piston arranged on a CV part, a pressure regulating mechanism used for controlling the pressure regulating piston and a judging mechanism used for controlling the pressure regulating mechanism to be opened and closed. The pressure regulating mechanism is used for inflating and deflating the upper part and the lower part of the pressure regulating piston according to the pressure reduction amount of the train pipe so as to control the CV pressure; the stepless relay valve is mainly used for transmitting CV pressure to the acting part through a lever, the acting part generates brake cylinder pressure C with the corresponding size to be balanced with the CV pressure, the position of a fulcrum of the stepless relay valve is controlled by a pressure signal of the weighing valve, and conversion of the brake cylinder pressure C is achieved.

The invention discloses a brake device for rail transit. The brake device comprises a movable disc seat, a movable disc, a static disc, a bearing, a shell and a cylinder cover. The movable disc seat is pressed on the axle in an interference mode, the bearings are installed on the two sides of the movable disc seat, and the movable disc and the movable disc seat are installed in a matched mode and rotate circumferentially along with the axle. The static discs are arranged on the two sides of the movable disc, the static discs and the shell are installed in a matched mode, meanwhile, the shell is installed on one bearing, and the outer side of the shell is connected to a bogie swing arm to restrain circumferential rotation. The cylinder cover is mounted on the other bearing, and an oil cylinder brake shoe stack adjuster and an oil way are mounted on the cylinder cover; the edge of the shell and the edge of the cylinder cover are connected in the circumferential direction to package the movable disc and the static disc. When a vehicle is braked, pressure is applied to the oil cylinder through the oil way on the cylinder cover, the oil cylinder pushes the static disc to press the movable disc, and the movable disc and the static disc enable axle wheels to decelerate until the axle wheels are static through pressure friction torque. The braking device has the axial floating adaptation characteristic, meanwhile, the friction area is increased, and the braking heat bearing capacity is improved.

The invention discloses an online monitoring system and method for the air braking performance of a long marshalling freight train, and the system comprises a power module, a pressure monitoring module, a vibration monitoring module, a data storage and transmission module, and an upper computer. Dynamic change data of pressure of a braking system and vibration data of a braking valve in the braking process are obtained through a pressure monitoring module and a vibration monitoring module, a truck is organized into a group for a loaded truck experiment, and a truck air braking prediction model is built by means of Matlab simulation software and carried on a train monitoring platform. Prediction values of pressure of all pipelines and cylinder bodies of a braking system are returned to be compared with real pressure values, the leakage rate of the pressure values of all the pipelines and the cylinder bodies, whether the 120 valve effect is good or not and whether braking and relieving delay of a train are normal or not are analyzed and evaluated, and safety early warning is given out when abnormal conditions occur. The method can be used for monitoring the state of the heavy-load train and has application value in the early warning aspect of a train braking system.

The invention relates to the technical field of pure electric driving parts, and discloses a pure electric driving part for a lithium battery monorail crane locomotive, which comprises a clamping module for providing rail clamping force of the monorail crane locomotive; the braking module is used for realizing electric output and mechanical redundancy of braking force; the control module is used for integrating a multi-channel closed-loop controller, independently controlling each driving part to operate and receiving a sensor signal in real time; a traditional clamping oil cylinder and a traditional brake oil cylinder are replaced by the clamping electric cylinder and the anti-explosion electric cylinder, pure electric drive control is accurate, actions are synchronous, meanwhile, clamping pressure can be adjusted in real time according to actual working condition requirements, locomotive sliding caused by wet and slippery rails of a locomotive is prevented, and through closed-loop control of the control module, the control precision of the locomotive is improved. The operation state of each driving part is monitored in real time, the fault can be accurately positioned, the fault reason can be quickly checked, and the driving device can be used for driving the pure electric driving part in emergency through the arrangement of the power supply module, so that the operation safety of the monorail crane is improved.

The invention discloses a rail wagon control information wireless transmission device which comprises a control mainboard, an antenna assembly and a configuration interface, the antenna assembly and the configuration interface are connected with the control mainboard, and the control mainboard is arranged in a train tail control device vehicle-mounted case of a rail freight locomotive and can directly obtain train brake release control information through the configuration interface. And the antenna assembly wirelessly sends the information to the vehicle-mounted monitor, and the vehicle-mounted monitor forms a control instruction and issues the control instruction to each vehicle for execution. A locomotive brake control handle position signal and a balanced air cylinder pressure value are quickly obtained through an acquisition processing unit additionally arranged in a train tail control device vehicle-mounted case and are sent to a railway wagon control information wireless transmission device in real time; after being superposed with a clock signal, the device immediately sends the clock signal to a vehicle-mounted monitor mounted on a vehicle through the wireless communication module, so that the timeliness and reliability of train control information are ensured.

The invention provides a frequency converter for a locomotive, a locomotive braking system and a control method thereof, and relates to the technical field of rail transit. The locomotive comprises a main air reservoir and a motor, the frequency converter for the locomotive comprises a pressure sensor, a control board card and a motor controller, and the pressure sensor at least partially extends into the main air reservoir and detects the pressure value in the main air reservoir; the control board card is connected with the pressure sensor, and the control board card can receive the pressure value and compare the pressure value with a pressure target value to form a comparison result; the control board card can send a control instruction according to the comparison result; the input end of the motor controller is connected with the control board card, the output end of the motor controller is connected with the motor, and the motor controller can receive the control instruction and adjust the output voltage and frequency of the motor controller according to the control instruction so as to control the rotating speed of the motor. The frequency converter for the locomotive can accurately control the pressure of the main air cylinder and improve the response speed and the stability of a brake system.

The invention provides an explosion-proof lithium battery rack rail vehicle electric control system and an explosion-proof lithium battery rack rail vehicle. The electric control system comprises a vehicle control unit VCU, an auxiliary power box, a cab controller, a power box, an oil pump frequency conversion all-in-one machine, a speed regulation controller and a brake valve, and the auxiliary power box, the cab controller, the power box, the oil pump frequency conversion all-in-one machine, the speed regulation controller and the brake valve are in communication connection with the vehicle control unit VCU through a CAN bus. The power converter is electrically connected with the power box, the oil pump frequency conversion all-in-one machine and the speed regulation controller; and a battery management system BMS, a plurality of storage batteries connected with the battery management system BMS and a contactor are arranged in the power box. According to the electric control system for the anti-explosion lithium battery rack rail vehicle, through the arrangement of the vehicle control unit VCU, the cab controller, the battery management system BMS, the oil pump frequency conversion all-in-one machine, the speed regulation controller and the brake valve, the vehicle control unit VCU can achieve information collection, information transmission and control over all the units through a CAN bus, and the safety of the vehicle control unit VCU is improved. The control precision and the response speed of an electric control system are improved, and the overall reliability of the anti-explosion lithium battery rack rail vehicle is improved.

The utility model provides a bogie device for track engineering machinery. The bogie device for the track engineering machinery comprises four sets of primary suspension devices which are installed at the positions, close to the two sides, of the bottom of a framework respectively. Two axles are installed at the positions, close to the two sides, of the bottom of the framework through axle box devices respectively, wheels are installed at the two ends of each axle respectively, lever type foundation braking devices are installed at the positions, close to the two sides, of the bottom of the framework respectively, each lever type foundation braking device comprises two braking levers, and the braking levers are arranged on the two sides of the framework respectively. The top end of one brake lever is provided with a horizontal lever body through a connecting rod, and the other end of each horizontal lever body is provided with a brake cylinder. According to the bogie device for the track engineering machinery, the basic braking capacity of a vehicle is effectively improved by increasing the configuration number of the brake shoes, the cost reduction effect is obvious compared with a unit brake type basic braking device, and meanwhile higher application stability is achieved.

The invention belongs to the technical field of railway wagon air braking, and discloses a railway wagon air braking modular assembling device which comprises an L-shaped hanging seat, a module hanging bracket and an air braking assembly, the air braking assembly comprises an auxiliary air cylinder, a double-chamber air cylinder, a pressure limiting valve and a 120 valve, the pressure limiting valve is installed on the module hanging bracket through an air path body, and the module hanging bracket is provided with an installation opening. The front side and the rear side of the module hanging bracket are provided with installation lapping plates, the L-shaped hanging seat and the installation lapping plates are vertically and mutually hooked and connected through bolts, and an upper longitudinal air cavity, a lower longitudinal air cavity and a vertical air cavity are formed in the air path body, the inner end of the lower longitudinal air cavity is communicated with two lower connectors on the left side of the pressure limiting valve, the inner end of the lower longitudinal air cavity on the front section penetrates leftwards to form a transverse air cavity, and the air brake integrated modular installation device has the advantages that air brake integrated modular installation is achieved, the space utilization rate is high, the structures are linked with one another, the working environment is improved, installation is easy and rapid, and cost is reduced.

The embodiment of the invention provides a brake control system of a novel rail train and the novel rail train. The brake control system comprises two EBCUs which are respectively arranged on a head train and a tail train of the novel rail train and are respectively connected with a vehicle CAN bus of the novel rail train through an internal CAN1 network; the plurality of ABSs are respectively arranged at the positions of the novel rail train, and each ABS is connected with the vehicle CAN bus of the novel rail train through an internal CAN1 network; the plurality of single-channel bridge control modules are respectively arranged at each axle of the novel rail train, and each single-channel bridge control module is respectively connected to the internal CAN2 network; and the multiple parking EPB valves are used for being arranged on all the trains of the novel rail train correspondingly, and all the parking EPB valves are connected to the internal CAN2 network correspondingly. The technical problem that a braking system of a traditional commercial vehicle is not suitable for a novel rail train is solved.

The invention relates to a motor train unit high-redundancy microcomputer control electric pneumatic brake control system which comprises a brake control device, a working air cylinder, an auxiliary air cylinder and a cutout cock, and the brake control device comprises an air brake valve, an electric pneumatic brake module, a relay valve, an empty and load valve, the cutout cock, a pressure reducing valve, a one-way valve, an electromagnetic valve and a pneumatic control valve. The electric pneumatic braking module comprises an electric pneumatic valve, a switching valve, a two-way valve, a shutoff valve and an electronic braking control unit; the electric pneumatic valve is of a redundant structure and comprises an inflation electromagnetic valve and an exhaust electromagnetic valve. One path of the auxiliary air cylinder is supplied by total air through a cutout cock, a pressure reducing valve and a one-way valve, and the other path is supplied by an air brake valve; opening and closing of the brake pipeline can be completed through manual operation of the cutout cock and electric control of train control signals. The technical problems that emergency braking is caused by low air pressure of an auxiliary air cylinder during frequent braking or skid prevention of an existing system, electric pneumatic braking reliability is guaranteed, and maintenance cannot be conducted in time when a braking pipeline breaks down are solved.

The utility model discloses a railway vehicle braking system and a railway vehicle. A main pipe of the railway vehicle braking system is provided with a rescue entrance; the main pipe is communicated with an input port of the pressure valve; an output port of the pressure valve is communicated with an input port of the brake; the main pipe is communicated with an input port of the pedal valve, an output port of the pedal valve is communicated with an input port of the switch valve, and the output port of the switch valve and the rescue pressure regulating pipe can selectively convey fluid to a pressure regulating port of the pressure valve to regulate the pressure of the fluid flowing from the input port of the pressure valve to the output port of the pressure valve. The railway vehicle can be normally braked, and the braking force for normally braking the railway vehicle can be synchronously adjusted; rescue braking can be carried out on the railway vehicle, and the braking force for rescue braking of the railway vehicle can be synchronously adjusted; even if the pedal valve of the rail vehicle is operated by mistake, the rescue vehicle is not influenced to control the rail vehicle to carry out rescue driving or rescue braking.

The present invention discloses a brake beam module and a brake structure containing the same, comprising an assembly beam, a connecting rod, a brake cylinder, and a cooler. The end of the assembly beam is rotatably connected to a wheel frame, and a wheel is installed on the surface of the wheel frame. When the wheel is braked, the first electrically controlled valve is opened, so that the high-pressure gas in the first gas tank controls the brake cylinder to contract, and the brake cylinder drives the brake seat and the brake pad to fit onto the wheel for braking. The brake pad contacts the rolling surface of the wheel with a large contact area, so that the wheel can stop rotating quickly to shorten the braking distance, and the brake pad and the wheel are cooled to avoid the problem of thermal attenuation of the brake pad. When the wheel is braked continuously, good braking force is maintained, and the brake pad clamps the wheel at two symmetrical points on the wheel, so that the friction resistance applied to the wheel is more uniform, and when the wheel is braked, the wheel is prevented from being subjected to different braking forces.

This application discloses a hydraulic valve control method, control device, and vehicle hydraulic brake control system. The hydraulic valve control method includes: obtaining a currently requested target pressure value and the actual output pressure value corresponding to the hydraulic valve; calculating a control output value based on the target pressure value and the actual output pressure value using a preset closed-loop control algorithm model; and adjusting the duty cycle of the drive signal output from the valve drive circuit to the hydraulic valve based on the control output value, such that the adjusted duty cycle is equal to the duty cycle corresponding to the control output value. Using this application, the magnitude of the output pressure corresponding to the adjusted hydraulic valve can be precisely controlled.

Provided by the present disclosure are a method and system for cooperative control of automatic train operation, and a computer storage medium. The method includes the following steps: setting air brake application and cancellation conditions of a behind vehicle according to a safety distance between a front vehicle and the behind vehicle; setting a corresponding variable time headway model according to speed states and air brake states of the front vehicle and the behind vehicle; determining a difference between an actual vehicle distance and an ideal vehicle distance according to driving data of the front vehicle and the behind vehicle as well as the variable time headway model; determining required acceleration of the behind vehicle when the difference tends to 0; restricting the required acceleration of the behind vehicle by using commanded acceleration; determining acceleration of the behind vehicle under a constraint of an air brake force; when the required acceleration of the behind vehicle is less than the acceleration of the behind vehicle under the constraint of the air brake force, taking the acceleration of the behind vehicle under the constraint of the air brake force as the required acceleration of the behind vehicle; and determining a corresponding traction or brake level according to the required acceleration of the behind vehicle. The selection of appropriate air brake magnitude of the behind vehicle can be achieved, the transportation efficiency is improved, the automatic train operation ability is improved, and the safety of automatic operation is improved.

This application relates to a hydraulic brake cylinder pressure control system and its control method. The control system includes a pressure generation module and a pressure control module. The pressure generation module includes a check valve, an external accumulator, and an accumulator sensor. The check valve is connected to an oil tank. The pressure control module includes a proportional solenoid valve connected to the external accumulator and the brake cylinder; a pressure-holding solenoid valve located at the overflow port of the proportional solenoid valve, which is connected to the oil tank via the pressure-holding solenoid valve; a brake cylinder sensor collecting and outputting the brake cylinder pressure; and a brake cylinder pressure switch electrically connected to the brake cylinder sensor. During the relief condition, the proportional solenoid valve is de-energized and the pressure-holding solenoid valve is energized. During coasting or braking conditions, the proportional solenoid valve is energized, and the pressure-holding solenoid valve is de-energized after a delay. This application reduces the usage rate of the proportional solenoid valve and improves system reliability through the coordinated control of the proportional solenoid valve and the pressure-holding solenoid valve.