Study On The Characteristic Of Powertrain System For Dual Clutch Transmission Vehicle

It is the modern automatic transmission technologies which used it can follow throttle pedal degree and vehicle operating mode last transmission ratio, make the vehicle obtain good comfortableness, power and fuel economy, reduce the engine and discharge pollution. Automatic manual transmission have the best problem which can't overcome power break down transfer to shelf, this motive force, comfortableness and fuel economy and discharging and bringing certain influence to the vehicle. Dual clutch transmission of basic principles is to adopt two sets of gear boxes to work together with two clutches, a gear box is at the time of the working state, another gear box dallies, realize the transition jobs of two sets of gear boxes by the switching over of two clutches, its course of shifting gears is very fast, dispel the automatic manual transmission inherent defect of cutting off power.To the key technology of dual clutch transmission, research and develop the foundation of establishing with dual clutch transmissions for the vehicle, this text has mainly carried on the following research work:1) The operation principle, merits , drawbacks and developing direction of the main automatic transmission vehicle at present have been analyzed, dual clutches transmission of structure and power transmission principle was key analyzed, have carried on analysis to key technology for dual clutch transmission;2) The structure and operation principle for several kinds of typical dual mass flywheel type torsional vibration damper is analyzed, the analysis and design method of dual mass flywheel - radial spring(DMF-RS)type torsional vibration damper for dual clutch transmission is studied in this paper .Based on the multi-freedom with mass-spring torsional vibration analysis model of powertrain system, the natural torsional vibration characteristics of the system with DMF-RS type torsional damper are analyzed, and compared with the clutch type torsional vibration damper;3) Test through the engine, other characteristic contours and some load characteristic curves of the motive of fitting and setting out, have been set up the steady state number value model of the engine and dynamic number value model, and has carried on the PI control to the engine electron throttle;4) The establishing methods of shift schedule for automatic transmission vehicle coupled with its advantage and disadvantage had been analyzed at presenting, the best shift schedule based on fuzzy neural network has been acquired, structure and algorithm on the basis of the fuzzy neural network by Takagi-Sugeno mode was studied, the shift schedule for dual clutch transmission vehicle according to the skilled driver's experience and expert's knowledge had been made, the fuzzy neural network had been trained and simulated;5) On the basis of analyzing structural form of dual clutches, utilized the law of best joint of the clutch for dual clutch transmission vehicle during starting and shifting control.