Urban rail transit signalin​∞πg system

Urban rail transit (metro)∑σ is developing vigorously in large and ∞‍"medium-sized cities in ∞ China and has become an effective way♥→± to solve urban traffic congestion. To ensur≤≠<e the normal operation of rail transit, t♥♣he core is the signal system, which"λ has very strict requirements in reliabil©γ™ity and security.

Signal system is also cal£ 'led ATC (Automatic train Control system), it → ™ includes microcomputer based ‍♦φinterlocking system (CBI), automatic tr γain protection systλ↔≥♥em (ATP), automatic t₹≠rain driving system (ATOΩ₽) and automatic train s"≤€upervision system (ATS). Interloc₽©Ωking system can ensure the correct logical  ♣"relationship between train occupancy, switches a§★nd traffic light sig♣₽nals in the track interval. The automa <✔ tic train protection sys&≈tem can ensure the safe running interval and ∑εsafe running speed of tδ™↑δhe train, and ensure that the train can take ♠δ©♠emergency braking and other prot♦ φective measures in time when a&£ll kinds of abnormal situations appear₽γ. Automatic train drivingσφ©‍ system can automatically control the operat•☆ ion and running of the t± ≠✘rain according to the set speed and driving ☆☆λplan. ATS can supervise and dispatch the π↓train operation of the whole line a∞₩±σnd make the train operation pl×λ®an in the central dispatching room.

In cooperation with listed enterprises, we ha ± ve jointly developed CBTC (Train "♣★> control system based on communicatπ←≠ion) urban rail transit signaling system, ​ε<which has passed the internationa<♣ε≈l safety certification of all su≈♦₽₹bsystems for the first time in China and has &αbeen successfully applied.

Fail-to-safe computer

In rail transit, aerospaceδα, nuclear power plant, petrochemical and<☆↑  other key fields, the failure of the syste>≥¥m will lead to serious consequences, will make ε ≠ people's lives and property and £ the environment suffer heavy losse→§∑δs, the control system in these field$φ>≠s must be very high reliabil< ♠Ωity and safety system, become a safety crit♥★ical system.

For safety critical system, based on the gener♥↓al industrial control compu&© ter is unable to achieve, because any device, δ• software and hardware may fail, need to use✘→' specially designed fail-to-≠Ωsafe computer.

The CEO of our company is the only prof♣∞←¶essor who open a special ∞♥fail-to-safe computer course in the dom←®estic universities. Our compan‌γy cooperated with listed companies to develδ≤‍op a fail-to-safe com≠♣puter based on 2-out-of-2 and 2-out-↑β₽•of-3 architectures, which h≈∑÷≠as passed the SIL4 ce​↔ε×rtification and has been applied in the λ σ♥rail transit signal systems.

Automatic fare collecting system

Automatic fare collecting sys§÷★≠tem (AFC) is a computer→£ system which realizes automatic ticket selli$☆ng, automatic ticket checkin✔↕g and automatic fare clearing of urban raiπλl transit. Including automatic tic≈←‌βket machine, automatic re'↓charge machine, automaticΩ₹Ω> ticket checking machine (gate machine)£Ω§✘, station system, line system, ACC syste™φ≠m. It can support one-way ticket purchas™§ e, cash payment, cash change, bank card pa±‌♣yment, intelligent identifica₩<tion of passengers in and ou​♦t of the station, direct entry of ★​small wallet in the bank, IC card recharge, Ω✘ clearing and settlement of different forms of ←©♦transportation and other functi ≈☆ons.

The automatic fare collecting syste♣€m jointly developed by our company and listed '€λenterprises has advanced technology and good relφ←≠≥iability, and the comprehensive fai∏₽∞©lure rate is at the best lev✔✔el in China. It has been successfully appl♥Ωied to more than 10 subway lines such as ≤£Hangzhou Metro Line 1, 2 and♠∏β♠ 4, Ningbo Metro Line 1 and 2, etc.

In this direction, we undertook hangzhou's"♠™π key science and technology project "Research a÷✔↕nd development and industrialization of₹Ω automatic ticket booking '÷™₹ equipment for compre"π$hensive transportation network", aβ∏nd achieved a number↓β of research results. In addition to urba ₹δn rail transit, the sy∑≤♦>stem can also be used for high-sp♥≠∞eed rail, intercity rail,​π$ bus and other transportation systems.

Urban rail transit network ™πNCC system

With the construction of urban rail trans✔✔↓&it lines, urban rail network ha≈♥£s been formed in most key c‌π∏ities. In order to realize the sch‌✘eduling and control of the whole¶₹≈ε network, it is necessary to build the centra™™ l dispatching and controlδ™↔↓ system of the network.≈"₩ The dispatching control system of line network φ ✔ center is a comprehensive command 'δ♦platform integrating operation monitoring, σ♠γ≠data sharing and emergency comm¶♣×£and functions, which can realize real-time£↑ monitoring and managem♠£ent of road network video, driving, poσ®π←wer supply, passenger flow, disast✘€er and other information. Entrusted by the cus£ tomers, our company has succes♠•sfully developed the dispatching control system δ≤of the line network center,♠→ including the communication control system σ ¥₹of the line network ce¥>©nter and the automatic dispatching system§♠ of the line network φ'₩&center, which has been successful€α♦ ly applied to the subway network of many ci®÷γties.

Subway obstacle detectionσ≠↓♦ system based on computer vision

The existing ATP (automatic train protection) o✘£♠ f urban rail transit  ↕≥≈can only realize t→$<he protection between trains and t£•£he distribution of moving authorization, ∑£but it is difficult to realize the d£®∏€etection and identification of obstacles on≠<→ track. At present, subway ob≠♠₩stacles rely on drivers to look out ∑♥α↑ from a distance, so there are many π♦©problems such as limited visual Angle ∑ ↑and eye fatigue. The subway obstacle dete↔©±ction system based on c ↓omputer vision developed by our ∏↕company can replace human eyes to realiz'₽e remote observation and give early warn✔↔←↓ing of possible obstacles on the track. The sys✘$∏tem is mainly divided int ★o three modules: track limit extraction modul≥σπΩe, image retrieval module, obstacle detection mπ£€odule based on comparison.♦λ® Track limit extraction, which combines tradi ∏tional track line detection with deep lear♣ ning track line detection algorithm, realizesα≥λ≥ track line detection and obtains track limit ‍§γthrough its outward expansion. Image ret ‍rieval module, input the current fra¥"$‍me to the reference image libr₩® ary to find the most similar correspond&→ing frame. By comparin<€★g similar images, the×↔ system can locate and iden★♠₽tify obstacles. In order ♠↔to realize real-time processing, CUDA acceλ₽​leration is introduced into some algo≈₩‌±rithms. The image processing and artiγ₽↔♦ficial intelligence technoφ¥ ₽logies applied by our companπ☆₹≠y in this project have good robustness and achie&‍ved high accuracy. The practical results show t£σγhat the system can accurate₽₽↑ly detect and warn the obstacles in front o©₹f the train.

Key technology of interoperable co₽&mprehensive test of urban rail t€≈ransit

This project is a national major ×β≥<project undertaken by our team in₽‌ cooperation with important domestic enterpr>Ωises and institutions of hi‌₽☆←gher learning. With the development←₽ of urban rail transit, the  ≥§∏system is becoming more♦§£ and more complex, a↓✔₹•nd there are a lot of designed subsystemsλ≈₽, which are designed and manufa¶>™ctured by different manufacturers. To en★↓™sure the reliable ope×↓ration of urban rail system, it is very impo♦σ™ rtant to ensure good inte≈ ¶↓roperability and compatibility betwe₽✔βen these subsystems. However, it is very eΩ×λ₹xpensive and impractica≠​©l to verify such interoperability ✘εin a real rail transit l∑​ine. Therefore, it is necessary to build ↔​•≥a test and verification environment based on ✔÷§Ωthe laboratory environment, the co₽€®←mbination of virtual and r≥✘eal, semi-physical and semi-♣§±simulation, to comprehensive₩×€ly test and verify the interoperability of the ¶♣subsystem of urban rail↔★✔ transit design, especially the ♦¥software system. Our team undert↕σ∞ook important research contents in this&∞β project and accumulated a lot of experien>‌>ce in the interoperabil∞≠<ity testing and verification of software s¥↑÷ ystems, contributing to the smoot‌¶"↔h completion of this project∞≥.