The development of a computer-based interlocking requirements and development

 

1.1 Computer Interlocking development requirements

To ensure that rail transport leaps and bounds, give full play to the railway signal factories, engineering units, specialized construction units, electrical service maintenance units role in ensuring the basic security conditions, based on the computer-based interlocking system allows multi-level units become widely participate to achieve an open interlock devices. Computer interlocking system of the ideal state is: ① complete factory production; ② completely standardized design; ③ most simplified construction site; ④ most simplified acceptance mode; ⑤ most simplified maintenance approach; ⑥ most simplified maintenance tools; ⑦ easiest secondary development that free secondary development; ⑧ complete device parameter monitoring function; ⑨ meet the railway traffic automation interface functions.

 

 

 

1.2 Computer Interlocking direction of development    

 

1.2.1 Take two squares two systems

UK's current computer interlocking system are: hot standby, two out of three and two by two to take two systems. Hot Standby system problem exists Dual switch, switch failure would have serious consequences for the risk; shielded redundant technology to take two of the three systems, although the possibility of dangerous output is extremely small, but there can not be downtime problems; therefore This year the main technological transformation and new railway lines have given priority to take two squares two systems, two by two computer interlocking system is also taking future trends.

 

 

1.2.2 Fully electronic

As manufacturing technology continues to improve, the electronic unit to get the vigorous development of electronic unit with a small, powerful features; facilitate networking, remote management and remote diagnostics. Thus, with the Ministry of Science and continues to progress, to get rid of the relay, using fully electronic computer interlocking will be a trend.

 

 

1.2.3 Modular

For ease of use and maintenance of computer interlocking should move towards modular, functional direction to achieve the module line replacement, saving the system maintenance time.

 

2 full electronic modular computer interlocking system features and functions

 

 

2.1 Fully electronic interlocking modular computer system with the characteristics

 

 

2.1.1 hardware configuration

Fully electronic interlocking modular computer system using industrial control technology, the abolition of all 6502 relay module is in direct control of the outdoor unit switch machines, signals machines, track circuits, in a clear, comprehensive fault diagnosis and fault indication and all modules support hot-swappable capabilities, cabinet wiring with plug-in cable directly correspond noseplate will minimize the amount of construction, the use of direct replacement module, the first maintenance after analyzing ways to achieve "fool" the construction and maintenance.

 

 

2.1.2 Software constitutes

Interlocking Software should break the current computer interlocking system interlock seclusion other barriers to achieve an open source code level, and its "messaging" and "module assembled" interlocking ideas and original 6502 15 network cable and Puzzles designed in a way similar to the implementation of modular, trained technical personnel should be able to cope with any new station interlocking software design and debugging, testing to ensure early detection can minimize and resolve software in a variety of potential security risks, computer-aided design system refers to the user input station plan and set the necessary parameters, you can automatically generate interlock programs and data to minimize human error.

 

 

2.2 Full computer interlocking system should have the function

2.2.1 achieve the basic functions and special interlock interlock function

Achieve progress on the road turnout, signal and track circuit interlock properly to ensure correct and train running into the road safety, to meet all of the interlock function 6502, the main features include: ① handle all stations train route, shunting into the road and roundabout approach. Equipment failure can be handled in the boot and boot into the path of total lockdown. ② The end is always handled two ways. Shunting into the road at once handled by a few basic approach consisting grow way, can also be handled by one segment. ③ signals belonging to the hostile approach, can not open. Only checked into the path of all track sections idle, all the relevant switch position is correct and has been locked in position, according to investigate and correct the hostile relations, the signal to open. ④ having a signal normally closed function, special off function to prevent automatic repeat function open signals and artificial repeat open feature. ⑤ with approach automatically unlock, halfway back to unlock, unlock cancellation approach, labor and trouble unlocking unlock approach into the road. ⑥ having separate operation functions turnout.

According to the special requirements of stations to achieve special interlocking relationships, such as: single hook slide release function, stock Road middle Chucha feature non shunting into the road, continuing into the road, local control station or turnouts and clinical linkages interval occlusion.

 

 

2.2.2 The flexible system configuration function

Fully electronic interlocking modular computer system using three-layer structure, the upper PC, Could it be an opportunity, then layer; upper layer via a communication network and the second interlocking machine communication; third layer is 10 module execution units.

According selection of different composition interlocking machine can achieve hot standby interlock fault tolerant computer or three takes two interlocking squares two computers or take two interlocking computer systems.

 

 

2.2.3 Monitoring Function

System without adding any other device, to achieve the indoor and outdoor equipment, the basic parameters and status monitoring.

 

 

2.2.4 History graphic reproduction function

System has a complete record function, can store a year's information, which includes: driving job handling information, station graphics (signals, turnouts, track sections and other field device status) information, reflecting the system runs a variety of data . Adjustable recording system for any period of time all the data for playback to reproduce the real situation of the system at that time, as the cause of the accident analysis provide a convenient tool.

 

 

2.2.5 improve self-diagnostic function

System through the readback, software and other technology to achieve the dual coding failure to board-level self-diagnosis.

 

 

2.2.6 maintenance and remote diagnostics

System capable of recording all operations and signaling equipment status; monitoring and reporting system failures; easily query a variety of information stored in the memory; storage and print records; through the network system  failure can notify to the remote maintenance department, the maintenance department may need to dispatch technicians to repair the corresponding remote diagnostics.

 

 

2.2.7 Implementation and other information systems binding function

The system has the oversight and scheduling, dispatching centralized systems such as communication. To achieve information sharing between stations.

 

 

2.2.8 weakening function with fault

System interlocking machine either hot standby, take two or three squares two take two, the input and output layer IO modules are used within "two to take two" to protect the "fail safe backward", that is, each module has two sets of circuits. Interlocking system of partial failure does not affect the safe operation of equipment in the case of systems with fault weakening function.

3 Conclusion

Full computer control of railway signal interlocking system is a new generation of interlock devices, systems to computer control technology as the core, power electronic switching technology based on the use of electronic means, the use of computer communications, automatic detection and other advanced technologies, to achieve full electronic control computer of the railway signal interlocking equipment, small, powerful, easy networking, for railway automation, information technology to provide basic information, remote management and remote diagnostics, railway signaling professional development.