Research On Power-shift Model And Hydraulic Control Characteristics Based On DCT Structure

Dual Clutch Transmission (DCT) is developed base on the parallel shaft transmission , it is a kind of all-new automatic transmission. The principle of a DCT works as following: In the Shift time, through two independent clutch groups sliding friction, to achieve uninterrupted power.DCT is a new generation of automated mechanical transmission. it could change the ratio under the power on, so it reduces the shift time and improves the shift quality. It also inherits the advantage of conventional Manual transmission, such as high efficiency, compact configuration, wide torque extension, So it has a bright market prospect. The DCT incorporates the merits of MT, AT and CVT, so the research and development about it has become the hot point in the world.The Article title is"Research on Power-shift model and hydraulic control characteristics based on DCT structure", Studies as follows:Chapterâ… introduces several typical automatic transmission and the development trend; A new transmission system DCT is Proposed; Analysis of key technology and development status; the article discussed the contents and significance.Chapter II of the structural principle of the DCT,introduced the Start And Or stall process, This paper introduces the Clutch Group, gear parts, hydraulic control of the physical structure.Chapter III DCT shift quality and Evaluation. The article in the research of others on the basis of the new process to increase the impact of the method of calculation; Corrected the wrong choice of stall in the calculation of the impact; The article also used shifting time and wear slip sliding as an evaluation index; torque decay rate as one of a new driving force evaluation; Finally, give some proposals on improving the shift quality.Chapter IV analyzed the model DCT Power Shift. Established a model of the engine, clutch static mechanical model; The introduction of new research ideas: Take torque and power flow as main line, analyzed two independent clutch alternately with the group dynamic process; Analyzed and calculated torque fluctuations, Clutch pressure changes; Through existing test data proved that the model and the validity of research methods are correct.Chapter V Major study Hydraulic Characteristics of DCT. Analyzed of hydraulic control system of three Circuit, Studied critical control solenoid valve; researched the clutch piston dynamics simulation model; been Drawing a map of the pressure cycle; finally the article optimization theory was applied to the pressure on the range.Chapterâ…¥is the full text of the summary of the research the paper summarized the conclusions of research results.According to the research work, we believe that DCT is of higher transmission efficiency, lower weight, smaller in sized and cheaper in price than the other Abstract automatic transmission. Besides, the power shifting is realized with simple parallel shaft transmission structure. This method will not only enhance the vehicle performances but also decreases the productive cost. Therefore, the DCT is specially suitable to be used in our country, at the same time hybrid vehicles is the research base and will take a important position in the automatic transmission field.