Hyundai-Kia’s SmartStream 1.6L Turbo GDI Engine

Authors

J. Y. Kim MSc, I. S. Ryu MSc, J. N. Kim PhD, D. H. Han PhD, K.-P. Ha PhD, J. Y. Kong MSc, J. D. Rho BSc, I. J. Hwang BSc, K. S. Choi MSc, Hyundai Kia Motor Group, Namyang, Korea

Year

2018

Print Info

Fortschritt-Berichte VDI, Series 12, No 807

Summary

As the need for environmentally friendly vehicles increase, automakers are improving pre-existing internal combustion engines and implementing the electrification on the powertrain. Hyundai-Kia is planning to launch the next generation powertrain branded as “SmartStream” which include the upcoming new 1.6L MPI and 1.6L Turbo GDI engines. To improve the fuel efficiency and emission, Hyundai-Kia adopts the innovative technologies such as Continuous Variable Valve Duration (CVVD) system and Low Pressure Exhaust Gas Recirculation (LP-EGR).
Hyundai-Kia developed the novel CVVD technology on the SmartSteam 1.6L T-GDI engine. This new engine with the CVVD system has the unprecedentedly long or short duration which can improve performance, fuel efficiency and emission. For fuel efficiency, the CVVD system reduces pumping loss using longer than conventional Atkinson cycle duration. To maximize the benefit of this long valve duration, the improvement in combustion is also desired. Therefore, high tumble port and optimized combustion chamber are implemented. In low engine speed boosting areas, CVVD effect is reduced due to naturally less pumping loss. Therefore, LP-EGR is added to improve fuel efficiency by reducing knocking. By the combination of CVVD and LP-EGR, fuel efficiency can be highly improved in the real driving conditions.
Additionally, the integrated exhaust manifold head helps to expand the lambda = 1 area compared to the previous generation engine. A 350-bar fuel injection system is applied to meet the stricter Particle Number (PN) regulations. Applying variable oil pressure pump and low viscosity oil reduce the engine friction. Consequently, the novel engine can differentiate Hyundai-Kia from other automakers by the combination of unique technologies. It will be available on Hyundai-Kia new vehicles and Eco cars (HEV/PHEV) in the near future.