Research On Global Matching Control Of Positive Flow Hydraulic Excavator

As the king of construction machinery,excavator is widely used in various fields,and its working efficiency has been concerned by the majority of users.Based on the research status of simulation technology and matching technology at home and abroad,this paper analyzes the overall matching principle and excavator system principle,and establishes a joint simulation platform including excavator mechanical system,control system and hydraulic system.According to the characteristics of excavator operation,three typical working conditions of single action of boom lifting,single action of slewing,lifting of boom and compound action of slewing are selected for matching research.Aiming at the matching problems of the excavator under the conditions of combined boom lifting and slewing combined action,the improvement was started from the control system and the hydraulic system.First,based on the joint simulation platform to improve the design of the program,and then through the test test to verify the program.In this paper,a large-scale positive flow hydraulic excavator of a company is taken as the research object to improve the working efficiency.The main contents of this paper are as follows:Firstly,the research status of simulation technology and matching technology at home and abroad is analyzed,and the previous research experience is summarized.Combined with the existing technical conditions,test conditions,cost constraints and other elements,a set of solutions to the matching problem of the existing models under typical working conditions is proposed.Secondly,the global matching control system of positive flow hydraulic excavator is analyzed,and the global matching mathematical model is established.Aiming at the mechanical system,control system and hydraulic system of excavator,LMS virtual.lab Mtion,MATLAB and AMESim software are used for modeling respectively.The software interface is used in AMESim for joint simulation.Based on the joint simulation platform,three typical working conditions of single action of boom lifting,single action of slewing,lifting and compound action of boom are simulated.Combined with simulation data and system characteristics,the improvement scheme design is studied.From two aspects of control strategy and valve port improvement,the existing model matching problems are studied.Finally,the whole excavator test is carried out to verify the accuracy of the joint simulation platform and the rationality of the improvement scheme.