In recent years, the automotive industry in China has experienced remarkable transformation, driven by rapid technological advancements. Many Chinese IT companies have entered the automotive sector, establishing multiple electric vehicle brands. Traditional Chinese automakers are also making significant moves, launching new brands that reflect a new era of growth. A key focus for these manufacturers is on independent research and development, particularly in power systems. Several Chinese automakers are now developing or beginning mass production of self-developed dual-clutch transmissions (DCTs) and hybrid systems, signaling a growing trend toward local innovation and production.
According to a report from the CTI China Forum, Great Wall Motor has successfully developed the first 7DCT450, a 7-speed dual-clutch transmission independently designed and manufactured in China. Zheng Lipeng, deputy dean of the Great Wall Automotive Transmission Research Institute, provided detailed insights into the development process, technical features, engineering capabilities, and testing conditions of this groundbreaking product.
Since its project launch in April 2014 and successful market entry in April 2017, the 7DCT450 was developed within just three years. Zheng highlighted that the transmission not only achieves top-tier quality but also features a compact design suitable for various vehicle platforms. It meets high-output requirements and benefits from a strong supplier system in parts, software, calibration, and production equipment, ensuring a high level of self-control.
Currently, the 7DCT450 is equipped with four engine models and operates under Euro 5 standards. The company plans to comply with Euro 6 emissions in the future. Its design spans from H2 models to VV7 and H7, demonstrating broad applicability.
When it comes to product positioning, Great Wall Motor chose DCT over AT due to several advantages. According to Zheng Lihua, DCT offers easier installation, a wider gear ratio span (>8), and compatibility with centrifugal dampers, which improves NVH performance. It also enhances shift quality, dynamic characteristics, fuel efficiency, and reduces mold costs, while leveraging experience from manual transmission development.
The 7DCT450 incorporates advanced technical features, such as low-energy system design, ultra-low viscosity lubricants, a dual-pump system, a highly reliable clutch and cooling system, direct shifting capability, advanced NVH systems, CAE simulation methods, transmission software development, and comprehensive calibration processes.
Great Wall Motor’s Transmission Division, located in Xushui Economic Development Zone, has a large-scale production facility covering 145,000 square meters. With an initial capacity of 500,000 units in 2017, the plant aims to reach one million units by 2018, showcasing strong engineering capabilities.
The company has invested heavily in test technology, using 20 transmission assembly gantries and 9 component rigs for bench testing, as well as a full-system test setup covering parts, assemblies, and complete vehicles. On the vehicle side, Great Wall Motor conducted extensive testing, including 26 vehicle test projects, with over 1,000 test vehicles used for calibration and endurance tests across different environments—high altitude, extreme temperatures, humidity, mountain roads, and deserts—to ensure stability and safety in all conditions.
This breakthrough in domestic transmission technology marks a significant milestone in China's automotive industry, reflecting its growing strength in innovation and engineering excellence.
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