Research On Electro-Hydraulic Brake System Of Power Bogie With Quick Exchange Between The Road And Rail

The road-rail vehicles can run on both the road and the railway,which have attracted extensive attention for many advantages like flexibility,economy and easy access to switch between the road and railway.One of the most important components of the road-rail vehicles is the power bogie.The performance of it directly affects the running of vehicles on the railway.The speed of road-rail vehicles on the railway is very fast.When running downhill at high speed,the volumetric control and hydraulic drive system of the power bogie will overload.The existing pneumatic air brake cannot overcome this phenomenon and has low efficiency,which will affect the safety of the vehicle on the railway.Moreover,all of the existing power bogies are fixed with trucks and can only be used for these vehicles.Based on the Topic 3 “Research on Key Technologies for Dual-purpose Chassis for All-terrain Tracks”,one of topics of national key research plan "Research and Application Demonstration of Key Technologies for Multifunctional Emergency Rescue Vehicles with High-mobility ",this paper innovatively proposes a quick exchange device that can ensure the quick exchange between the road and rail and improve the generality of vehicles.It also designs an electro-hydraulic brake technology of the volumetric control and hydraulic drive system for power bogies to overcome brake failure caused by overload.Firstly,the overall structure of the power bogie is designed according to the structures and research requirements of road-rail vehicles.By comparing the existing power bogies,a power bogie scheme with double-wheel hydraulic drive and rubber spring vibration reduction is made in the end.Secondly,an electro-hydraulic brake technology of the volumetric control and hydraulic drive system is designed aiming at the brake failure.By developing a braking scheme with variable back pressure value,the overload can be effectively overcome.The technology is applied to power bogies to do simulation research of dynamic characteristics of the system.PID and fuzzy PID controllers are designed and the control performance of the system is optimized and analyzed.Thirdly,the power bogie is connected with the vehicle,and a matching electric control system is installed to test the electro-hydraulic brake system of the power bogie.The experimental result shows that the electro-hydraulic brake system can overcome the overload effectively,so that the road-rail vehicles can brake well when running downhill at high speed to ensure the safety.Finally,an innovative quick exchange device for power bogies is proposed.The device is designed and the working mode is introduced.The rationality of the design scheme is verified through statics analysis.Through experimental testing,it can be quickly interchanged in 10 minutes.