Research On Hydrostatic Transmission System Of Crawler Bulldozer

Full hydraulic bulldozers have such characteristics as having simple and compact structure, easy and flexible control, being easy to realize intelligent control and also can easily realizing stepless speed regulation and spin. It represents the development direction of the bulldozer. As its core part, the static pressure drive technology and the control technique are the hydraulic transmission direction of the research focus. At present, static transmission technology of the full hydraulic bulldozer is mature in foreign countries. There is a big gap in dynamic performance and fuel economy between our country and foreign countries.According to the full hydraulic drive system of running bulldozers and control theory, combined with the existing hydraulic bulldozers control scheme of the characteristic, this paper puts forward a set of new control scheme-speed automatic throttle-all the power control scheme, the scheme design of process control system. Based on the static pressure driving principle, the full hydraulic bulldozers simulation with100horsepower experiment platform has been built. At the same time, this paper is going to design the drive system, drive control system, experimental loading system and data collection system of this platform, and calculate the main components of the model selection, as well as the drive system’s rated pressure and the highest pressure.Using the experimental platform, the experiment analyses the efficiency characteristics of the variable pump’s usage. According to the characteristics of bulldozer, the paper simulated the performance under the bulldozers empty line, forward to, in situ to, set soil, and the soil conditions. The result shows that the new control scheme of the control system can automatically adjust according to the load characteristic of the variable pump motor with variable of displacement, adjust the engine accelerator, make full use of engine torque, makes the engine and the drive system in high efficient area operation.This paper puts forward the simulation experiment platform that is about the speed of the handle to be automatic throttle all the power control plan and design setting up100-horsepower full hydraulic bulldozers, which provided a reference for the research of full hydraulic drive and control system of the bulldozer.