All New 2.0L Turbo-charged GDI Engine from SAIC Motor 2021-01-1230

SAIC Motor has developed an all new 2.0 L 4-cylinder turbocharged gasoline direct injection engine to meet the market demand and increasingly stringent requirement of CAFE and tail-pipe emission regulations.

A series of advanced technologies have been employed in this engine to achieve high efficiency, high torque and power output, fast response low-end torque performance, refined NVH performance, all at market leading level, and low engine-out emissions. These main technologies include: side mount gasoline direct injection with 35MPa fuel injection system, integrated exhaust manifold, high tumble combustion system, 2-step intake variable valve lift (DVVL) with Miller Cycle, efficient turbo charging with electric wastegate (EWG), light weight and compact structural designs, NVH measures including balancer system with silence gear, friction reduction measures, optimized thermal management, etc. As a result of application of these technologies and optimized designs, the engine is able to achieve over 39.5% maximum brake thermal efficiency (BTE), as well as large high efficiency region in the fuel map that covers most typical customer real driving conditions. It delivers 360 Nm maximum torque from 1500RPM to 4000RPM, and 172kW rated power at 5500RPM, with fast low end torque response.

The new 2.0T engine already started the mass production in October, 2020, with its first application in ROEWE iMAX8, a MPV. Even with the weight of 2058kg, the vehicle is able to achieve 9.3s 0-100km acceleration, while meeting China VI b standard emission regulatory requirement equipped with this new 2.0T engine.

In this paper, the design/optimization of the engine systems will be described. The detailed investigations with simulations and dyno testing of effects of the core technologies will also be presented.