Design And Experimental Study Of Hydroelectric Hybrid Track Chassis

At present,the traditional crawler chassis is usually driven by hydraulic drive or pure electric drive,and the hydraulic drive crawler chassis system often has problems such as high power consumption,system response lag,etc.The electric drive track chassis is limited by the battery capacity and the power-to-weight ratio of the motor,which leads to short endurance and insufficient power-to-torque output.In agricultural application,tracked equipment is used in different working conditions such as hills,mountains,wet fields,dry land,etc..while a single drive system makes it difficult to meet the working conditions of different application scenarios.In order to solve the problems of high energy consumption,single driving mode and slow system response,a new type of high-efficiency hydraulic-electric hybrid tracked chassis is proposed in this paper,the whole machine integrates two power systems of hydraulic drive and electric drive,which can realize stable driving under complex road conditions and other harsh conditions.The main difficulties and challenges encountered in the development process include: 1)different from the traditional track chassis with a“Two-wheel and two-tension” mechanical structure and based on the original structure of the traditional track chassis,the hydro-electric hybrid track chassis should not only ensure the tension track function but also the energy transfer through tension wheel as the driving wheel;2)the output characteristics of the two systems are quite different,so the power needs to be adjusted in the integrated power output control.In order to solve the above technical difficulties,a new integrated tensioning mechanism is designed and developed in this paper.The simulation analysis of dynamic coupling matching control is completed.The main research contents are as follows:1)the overall structure design of the hydraulic-electric hybrid crawler chassis was carried out,and a new type of frame integrated tension scheme was proposed;a dual-oil-source driving scheme was selected;the walking device,transmission system,key components and spatial layout of the crawler chassis were designed and calculated,and the three-dimensional structure modeling was completed;2)the design of the prototype global driving principle,hydraulic system principle and electrical system principle was completed,matching the hydraulic system volume speed regulation and electrical drive system speed regulation control,and the whole machine power was determined to be 33 k W;a vehicle dual-system joint simulation model based on AMESIM and MATLAB software was established,and the performance of the hydraulic-electric hybrid crawler chassis under different working conditions was simulated and analyzed;3)the prototype is developed,and the main technical indexes of the prototype are tested in the field.The experimental results show that the mass of the prototype is 1112 kg,the position of the mass center of the prototype is reasonable,the design requirements of the 1.5 m/s limit speed and the climbing requirements of 20 ° are satisfied,showing good slope steering performance,and the linear deviation rate is less than 2%,demonstrating that the prototype has good long-distance driving stability under different modes.