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Study on Shift Smoothly and Control Method of Hydro-Mechanical Continuously Variable Transmission

Author: ZhangXinSheng
Tutor: ShangTao
School: Jilin University
Course: Mechanical and Electronic Engineering
Keywords: Hydraulic Machinery Steady paragraph breaks Control strategy Clutch hydraulic control Co-simulation
CLC: TH137
Type: Master's thesis
Year: 2011
Downloads: 111
Quote: 0
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Abstract


Engineering vehicle is extremely poor working environment and working conditions complicated and volatile, so the use of hydraulic mechanical continuously variable transmission engineering vehicles and other heavy vehicles stepless automatic transmission is becoming increasingly important. The continuously variable transmission to achieve transmission not only increase productivity, reduce fuel consumption and has an important role, but also can greatly reduce the labor intensity of the driver, to improve ride comfort. Currently, a lot of research on the hydraulic mechanical continuously variable transmission, but not yet a comprehensive set of change the segment control strategy theory. Therefore, carry out hydraulic mechanical continuously variable transmission is smooth for segment has important theoretical and practical significance. The main purpose of this paper is to improve the quality of the hydraulic mechanical continuously variable transmission paragraph breaks, focus on smooth hydraulic mechanical continuously variable transmission paragraph breaks rules and control strategy, and the establishment of hydraulic mechanical continuously variable transmission system simulation studies. Following this study. This paper introduces dual stream transmission principle, the selected points moments exchange-speed type hydraulic mechanical continuously variable transmission, and a detailed analysis of its speed, torque, power, efficiency and hydraulic power split ratio. Paragraph breaks quality evaluation indicators and influencing factors. Establish the dynamic characteristics of the hydraulic mechanical continuously variable transmission equation. MATLAB / SIMULINK, STATEFLOW platform and ADAMS virtual prototype and were applied paragraph breaks HMCVT the simulation model. A detailed analysis of the change in the output rotational speed, torque and clutch friction work. And clutch engagement pressure, bonding to simulate and analyze the impact of the time, the moment of resistance, such as changes in the quality of paragraph breaks, clutch control strategy. Simulation test in order to verify the correctness and feasibility of the strategy of the strategy using two modeling and simulation methods. And virtual prototype modeling and simulation results SIMULINK modeling and simulation results for comparison, found the virtual prototype simulation results closer to reality, but the simulation speed is slow, the simulation results with the simulation results of SIMULINK less. The two simulation results of the clutch this paper paragraph breaks hydraulic control strategy can effectively reduce the change paragraph shock, improve paragraph breaks quality. The results of this research stability changer hydraulic mechanical continuously variable transmission segment has a certain theoretical and practical significance.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Hydraulic transmission
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