Development of electro-hydraulic proportion control system of track-laying machinery for high speed railway construction

This paper mainly deals with the development of electro-hydraulic(EH) proportion control system for travelling and track-laying work in the track-laying machinery (TLM) for high speed railway construction. Different from TLM used to low speed railway construction, TLM for high speed railway construction is a kind of the full-automatic continuous track-laying work machinery, and it is characterized by flowchart process and self-travelling. In order to increase the operation production rate and work quality of the track-laying machinery, a distributed electro-hydraulic proportional control system to be based on controller area network(CAN) bus type of networked control network which can realize the coordinated control among multiple hydraulic implement mechanisms is proposed. In this system, the travelling speed of the TLM is chosen as the primary connected variable of sleeper-working. Using the measured travelling speed of TLM via the triggering-wheel, the developed system can implement the control for the wheel-rail travelling speed and tractive force, the sleeper-laying and sleeper-conveying is constructed. Addressed the coordinated control of the travelling system, a compound cooperated control system is designed for coordinating between the tractive forces and the travelling speeds of the crawler vehicle and the wheel-track work vehicle. For the speeds coordination of multiple-sleeper-conveying-motor, the relative coupling control law is presented based on the threshold type of fuzzy PID. The simulation, the worksite test and the practical application show that the developed control system can meet the requirements of the sleeper-laying operation.