In the era of electrification, this Chinese brand is still doing research and development of internal combustion engines｜Shanghai Auto Show 2021

Reporter | Hou Zhuokai

Edit | 1 At present, with the increasingly stringent domestic emission regulations and tax requirements, domestic small-displacement turbocharged engines are in the heat of the industry. In the high-end market, Chinese auto brands do not have large-displacement engines and self-developed high-end transmissions to match them. But this situation has been broken. On April 19, Great Wall Motor Hive Yichuang released the first domestically-developed 3.0T+9AT/9HAT powertrain. It is understood that this powertrain consists of the 6Z30 engine independently developed by Great Wall Motors and the first domestic 9-speed hydraulic automatic transmission/the first domestic P2 hybrid 9-speed hydraulic automatic transmission. The new powertrain will be used for vertical placement. The layout of the Great Wall Motors tank platform will be mass-produced within this year. As the flagship power of Great Wall Motor’s high-efficiency fuel technology route, the 6Z30 3.0T engine adopts a V-type 6-cylinder type, adopts dual injection system, Miller cycle, dual VGT supercharger, intake manifold integrated water-cooled intercooler, and full map engine Oil pump and other technologies can output 260kW maximum power and 500N·m maximum torque, and currently have the strongest performance attributes among Chinese auto brands’ 3.0L displacement engines. This engine has strong low torque, and the official said it can burst out 340N·m of torque at 1000rpm, which can cover a variety of off-road life related products such as large SUVs, pickups, and RVs. At the same time, this engine meets the national 6b+RDE, Euro VI d, SULEV30 and other emission standards. It is matched with 9AT and 9HAT transmissions. Among them, the 9AT transmission is an advanced transmission used in the vertical high-efficiency fuel power system; the 9HAT transmission is a P2 hybrid transmission used in the hybrid power system. Great Wall Motor’s 9AT transmission is the first 9-speed hydraulic automatic transmission in China. It adopts the self-developed hydraulic automatic transmission structure scheme optimization program and intelligent integrated electronic hydraulic module and other technologies, hoping to achieve a breakthrough in transmission performance. Under the condition that the transmission size is controllable, the transmission load capacity of up to 600N·m is realized. Based on the powerful torque support of the 3.0T engine, the 9AT transmission sets the three gears 7, 8, and 9 as overspeed gears to improve the fuel economy performance of the vehicle. In daily driving, the 9th gear can be engaged when the vehicle speed reaches about 90km/h. The 9HAT transmission released this time is the first P2 hybrid 9-speed hydraulic automatic transmission in China. On the basis of 9AT, 9HAT adds a high-power P2 hybrid motor, which can realize the pure electric or hybrid drive mode of the whole vehicle. The transmission load capacity of up to 750N·m can be achieved while the transmission size is controllable, which further improves the power and ride comfort of the vehicle. In the end, the 3.0T+9HAT powertrain can achieve a total system power of 410kW and a peak torque of 750N·m. Last year, Great Wall Motors released a multi-platform strategy. Among them, the lemon hybrid DHT, 4N20 2.0T+9DCT/9HDCT, P4 three-in-one pure electric bridge in the “Lemon platform” has formed a system power from 35kW to 320kW, and the installed models are from Layout from A00 to D.