The New Hyundai-Kia’s Smartstream 1.5 L Turbo GDI Engine

Autoren

Dr. ByoungHyouk Min, KyuMin Hwang, HoYeon Choi, HanSol Park, Dr. KyoungPyo Ha, Dr. DongSuk Chae, CheolSoo Park, HwangBok Lee,
Kwan-Soon Choi, Hyundai Motor Group, Namyang, Südkorea

Zusammenfassung

Hyundai-Kia is planning to launch the next generation Smartstream 1.5 L turbocharged gasoline engine. The new engine will replace the previous generation of 1.4 L engine, with highly improved fuel economy and performance. To improve the fuel efficiency and emission, Hyundai-Kia adopts the innovative technologies such as Continuous Variable Valve Duration and LP-EGR system accompanied by new version of control strategies.

Hyundai-Kia introduces the world first technology: Continuous Variable Valve Duration (CVVD) system on the Smartsteam engine. The CVVD system can realize the unprecedentedly long or short duration valve timing strategy which improves performance, fuel efficiency and emission simultaneously. To improve fuel efficiency, the CVVD system reduces pumping loss with long intake valve open duration which is longer than that of typical Atkinson engine in hybrid vehicles. High tumble port and optimized combustion chamber shape were developed to maintain stable and fast combustion and maximize the benefit of the wide intake valve open duration. In low engine speed boosting region where the pumping reduction benefit of CVVD is diminished, LP-EGR was adopted to improve fuel efficiency by knock reduction. High fuel efficiency were achieved under real driving conditions by the combination of CVVD and LP-EGR.

Additionally, the LP-EGR helps to expand the stoichiometric A/F area compared to the previous engine. 350-bar injection system and GPF was applied to meet the stricter PN regulations. Cylinder liner friction and combustion chamber temperature were reduced through the coolant flow optimization such as water jacket insert with rip seal structure and cross coolant flow pattern. Integrated thermal management system (ITM) improved the fuel efficiency and high load engine performance simultaneously by optimizing coolant flow controls. Coolant flow stop function of ITM enabled fast engine warm up and early EGR activation. Applying variable oil pressure pump and low viscosity oil reduce engine friction. Consequently, “Smartstream engine” can differentiate Hyundai-Kia from other automakers with its outstanding performance by the combination of unique technology. It will be available on Hyundai-Kia new compact vehicles in
European market in near future.

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