1. 研究目的与意义（文献综述）

dual clutch transmission (dct) technology is an advanced automatic transmission technology in the global automotive industry. it has the comfort of automatic transmission and the flexibility of manual transmission, and can provide power output without interruption. the advantage of double clutch automatic transmission has become the focus of research and development of international automobile enterprises, and it is also the development trend in the future. at present, the domestic automobile enterprises that study dct are byd, jianghuai, shangqi passenger car and so on. abroad, they are mainly represented by volkswagen, as well as the latest 8-speed dct, with hydraulic torque converter developed by honda of japan, as well as ford, general motors and other enterprises.

since the mass production of dct, it has developed rapidly in foreign markets, europe, the united states, japan and other countries have a certain market share. in europe, germany's volkswagen group is the leader of the dual-clutch gearbox, at volkswagen (the starting model is 142800 of the bora, the flagship model is 536800 of the imported cc3.6), audi, seat, skoda, bugatti, even the dual-clutch gearbox, which is widely used in volkswagen commercial vehicles, has a huge share of the entire dct market. in addition, porsche, bmw, mercedes-benz in germany, fiat and ferrari in italy, france's renault, peugeot-citroen, britain's lotus and other brands of individual models also took the dual-clutch transmission. in the united states, ford equipped the 2008 fox and c-max with wet models.

dual clutch gearbox, the new generation of ford focus, mondeo, s-max, galaxy and kuga can choose dual clutch gearbox; gm's bankruptcy protection and restructuring have affected the dual-clutch gearbox, and its introduction has been delayed again and again. gm plans to introduce a thousand-clutch gearbox in 2012 to equip gmc granite, in at-dominated japan, and mitsubishi has released its own dual-clutch sst (sport shift transmission in tokyo.

2. 研究的基本内容与方案

2.1 basic content

(1) the structure, performance, advantages and disadvantages of various automatic transmissions are analyzed.

(2) the working principle and characteristics of dct transmission of reference vehicle are analyzed.

3. 研究计划与安排

semester7,19th to 20th week to determine the graduation design topics, graduation design task book (related parameters), school data collection.

semester8,1st week organize ideas, search reference, complete the opening report.

semester8,2nd to 3rd week off-campus internship, off-campus data collection, completion of internship report.

4. 参考文献（12篇以上）

1. chen liang, hao hongtao, ni fanfan, yan dong. research on modeling and simulation of dual clutch automatic transmission system [j]. 2018.2.

2. liu xuewu. research on conceptual design of a seven-speed wet double clutch automatic transmission [d]. 2016.4.

3. zhao han, sun yingbo, huang kang, qiu mingming. research and simulation analysis of shift law of double clutch automatic transmission [j] 2014.11.