Design And Fabricaton Of A New Mechanical-electrical-hydraulic Integration Continuously Variable System In Vehicle

The application of automatic transmission make the operations more streamlined for the driver, not only reduced the driver's labor intensity, but also in reducing the traffic accidents caused by human factors, it will enter the mainstream automotive market in the future. But they have to face the issues of power and economy along with the above advantages. Reference to the different characteristics of current automatic transmissions, the writer of the paper have tried to design creatively and research a new kind of electro-hydraulic volume adjustment speed system (MHV for short).MHV system The design of its system originally from electronically controlled hydraulic mechanical automatic transmission(AT for short), which by the torque converter and planetary gear trains in series. The principle of the torque converter is complex and its cost is expensive, so they choose the volume adjustment speed devices to replace the hydraulic torque converter to achieve hydraulic stepless speed control; there are double planetary gear in the structure, parallel with the hydraulic part to achieve the power split and merge, and ultimately changing the output speed and torque; and combined with the electronic control unit,they could control the switching of each gear to achieve the stepless speed regulation.MHV system combining planetary transmission and variable hydraulic pump -motor volume transmission, for the realization of stepless speed control functions. As the MHV system is an innovative, and its design principle and the working principle are different from the existing automatic transmission. So in the process of the system design,they have no exist experience to Reference.This article focuses on Clarify the working principle, design ideas of the MHV system, and reference to domestic technical parameters, proposing specific design requirements. According with the mechanical design manual and hydraulic engineering manual and other related books, they design and calculate the key parameters of hydraulic stepless speed control system independently. According to calculated data, combined with three-dimensional design software CATIA, they established the three-dimensional solid model of the system. Reference to relevant case of vehicle control systems, combining Matlab/simulink software to establish the simulation model. Reference to the requirements of the transmission tests in domestic, they proposed pilot program. Related to the existing experimental conditions and they have finished the installation and the preliminary test, they find some experience and theoretical basis for further testing and debugging.