The Simulation And Research Of AMT With Torque Assist Mechanism’s Shift For Heavy-duty Vehicle

Heavy vehicles play a pivotal role in the transport industry. With the development ofautomotive technology, higher requirements which include a good power, economicperformance, comfort as well as simplified operation for relieving the driver’s fatigue areexpected for heavy vehicle. Therefore automatic transmissions are gradually applied toheavy vehicles.The automatic transmission existing in the word can be divided into AutomaticTransmission (AT), Automatic Mechanical Transmission (AMT), Continuous VariableTransmission (CVT) and Double Clutch Transmission (DCT). Every automatic transmissionhas its own advantages and disadvantages. Generally considering the factors such as cost,difficulty of technical requirement, production inheritance and transmission efficiency, AMTwith the incomparable advantages are most suitable for heavy vehicles. AMT derived fromManual Transmission (MT) inherits the high transmission efficiency, low technicalrequirement as well as shift power interruption problem from MT. If the power interruptionproblem can be solved well AMT will be more popular. Aimed at the problem for heavyvehicle, the paper proposed a new structure called AMT with torque assist mechanism. Thisstructure based on the traditional AMT was achieved by adding an auxiliary clutch to theoriginal gearbox. The structure can ensure power shift for heavy vehicle. To put it anotherway there is still power output to the wheels in shift process. The development of AMT withtorque assist mechanism is a long process. The technology mostly works in the shift process,therefore, it is very necessary to simulate and study the shift process.In this paper, I did some simulation research on the traditional AMT as well as the AMTwith torque assistive gearshift process, a heavy vehicle taken as a platform and two gear liters third as an example. The main content:1) Researched the structure, working principle and key technology of traditional AMTand the AMT with torque assisted mechanism proposed in this paper. The researching statusat home and abroad for improving the power interruption of traditional AMT was discussed.2) Studied the classification and formulation method of existing shift schedule. Madedetailed research on the shift process of traditional AMT and AMT with torque assistedmechanism. Based on this, the separation and binding process of the auxiliary clutch wasanalyzed.3) The stress analysis and dynamic modeling was made according to the shift processfor AMT with torque assisted mechanism and traditional AMT. The separation and bindingprocess of main clutch and synchronizer working process was also studied.4) By making comparative analysis of shift process simulation results of AMT withassist mechanism and traditional AMT, verifying and analyzing the improvement of thepower interruption problem in shift process on AMT with torque assist mechanism comparedwith traditional AMT.The Simulation and Research of AMT with Torque Assist Mechanism’s Shift forHeavy-duty Vehicle has much theoretical and practical significance on the following study ofthe AMT with torque assist mechanism technology.