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.

The dual clutch SST provides drivers with three modes of normal, motion, and super motion to meet the needs of a variety of roads. Nissan's GT-R uses a six-speed dual clutch gearbox, like other high-performance sports cars, and Honda is developing a dual-clutch gearbox that it plans to match with a new generation of Monica power systems.

Based on the structure and working principle of double clutch automatic transmission, the structure, performance and advantages of common transmission are analyzed. at the same time, the working principle and characteristics of reference vehicle DCT transmission are also analyzed. Then the structure and control strategy of DCT are designed to make the power and economy of the vehicle meet the demand.

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) Design DCT transmission.