Study On The Performance Of Synchronous Control Of Heavy Haul Railway Locomotive Based On DSPN

Heavy haul transportation technology has become an internationally recognized direction for the development of railway freight transportation. The carrying capacity could be enhanced through increasing train marshalling and multi-locomotive simulatious traction. Multi-locomotive traction has a high request for the synchronization. Synchronous control means that the locomotives of heavy haul train start, accelerate, decelerate and brake simultaneously within the allowed time delay according to the instructions of master control locomotive. If the locomotives operate out of synchronization, extrusion or retractor may happen among vehicles, which will affect the safety of railway transportation, and the transportation efficiency. Therefore, synchronous control technology is very important for the safe operation of heavy haul transportation. In order to realize the synchronous control of locomotives, the control command from the master control locomotive should be sent to the slave control locomotive in real time. At present, Locotrol and ECP are used widely in the world. According to the current status of heavy haul railway locomotives and vehicles, Locotrol is used as the synchronous control system in our country. In this paper, the synchronous control command transmission is divided into two parts:the first part is that the master locomotive sends control command to the slave control locomotive through the wireless data transmission system, the second part is that the control command is transmitted in the train pipe to the vehicles with the state of brake wave.In this paper,800MHz radio, GSM-R network and LTE network are used as locomotive synchronous control information transmission system. The structure and characteristics of each system are introduced. Combined with the characteristic of Petri net, deterministic and stochastic Petri net is chosen as the modeling tool. Failure and recovery models and data transmission models of locomotive synchronous control information transmission system based on 800MHz radio, GSM-R network, and LTE network are established. The models are simulated on TimeNET4.0. The data transmission delay characteristic under different communication modes and the influence of running speed on communication are analyzed and compared according to the results of simulation. The results show the three kinds of communication ways can meet the requirements of synchronous control system under the existing condition, but the data transmission delay of LTE network is shorter than the other two.Due to the impact of many external factors on the transmission delay of brake wave, such as the length of train pipe and three-way valve, the simplified brake wave transmission model based on DSPN is established. After simulating, we analyze the influence on the train synchronous control performance from brake wave transmission delay. The communication failure and the length of train formation also have the influence on the brake wave transmission delay. The feasibility of the model is verified by the test method. The result shows that the reliable of brake wave transmitting control command can meet the requirement of the synchronous control system when the communication is in normal. If the communication failed, the control command can’t arrive at the slave control locomotive within a prescribed time, brake wave transmission delay will increase, which will affect the synchronous control performance.The research of this paper has an important practical value for the study and improvement on the synchronous control performance of heavy haul combined train.