Through the the analysis of the sub-actuator\'s working principle,the shift function curve was drawn,and a mathematical model was established for the shifting plate convex contour.

Using the principle of information covering, the grey model as well as the regression model for the ventricular function curve have been developed with only a small amount of information.

The method of wedges (or the limit equilibrium method) is employed to analyze the distribution of active bulk-solid pressure on curvy walls,and then the method called modified Coulombs formula for curve retaining wall is developed by modifying the formula for beeline wall.

Based on the performance features of construction vehicles,aiming at the best adaptability to the complicated environment and the online realtime features,the control principle of intelligent gear shift of construction vehicles was established.

Using software designing platform LabVIEW and data acquisition card PCI-6220,build a shift performance testing system for automobile transmission,realize real-time synchronous data acquisition,waveform chart display and data save of shift force,shift displacement and output shaft rotate speed.