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Hyundai develops first Continuously Variable Valve Duration (CVVD) technology engine

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Hyundai Group Press Release  /  July 2, 2019

Hyundai Motor Group developed the world’s first Continuously Variable Valve Duration (CVVD) technology and will now apply it to mass production. The innovation was revealed alongside the first engine to feature it: the Smartstream G1.6 T-GDi.

CVVD optimizes both engine performance and fuel efficiency while also being eco-friendly. The valve control technology regulates the duration of valve opening and closing according to driving conditions, achieving a 4% boost in performance and a 5% improvement in efficiency. Furthermore, the technology also cuts emissions by 12%.

“The development of the CVVD technology is an opportunity for Hyundai Motor Group to take the leadership in powertrain innovation.” said Albert Biermann, President and Head of Research and Development Division at Hyundai Motor Group. “We will continue our innovation efforts which would bring forth paradigm shifts and ensure sustainability of our business model.”

Innovation: Continuously Variable Valve Duration

Until now, an engine’s performance and efficiency have been governed by variable valve control technology that adjusts the timing of valve opening and closing and depth of the valve’s opening, with engine power produced through the fuel intake-compression-expansion-exhaustion cycle.

Typical variable valve control technologies manage the timing of the valve’s opening and closing (as in Continuously Variable Valve Timing - CVVT) or control the volume of air admitted by adjusting the depth of the opening (Continuously Variable Valve Lift - CVVL). Previous variable valve control technologies could not regulate valve duration, as the valve’s closing timing was subordinate to opening timing, so could not respond to diverse driving situations. CVVD takes the technology in a new direction by adjusting how long a valve is open.

When the vehicle is maintaining a constant speed and requires low engine output, CVVD opens the intake valve from the middle to end of the compression stroke. This helps to improve fuel efficiency by reducing the resistance caused by compression. However, when engine output is high, such as when the car is driving at a high speed, the intake valve is closed at the beginning of the compression stroke to maximize the amount of air used for the explosion. This enhances torque to improve acceleration.

Smartstream G1.6 T-GDi Engine

Unveiled alongside the new CVVD technology, the new Smartstream G1.6 T-GDi Engine is a V4 gasoline turbo unit with 180 horsepower and 27.0kgm of torque. The new powertrain is the first to utilize the Group’s new CVVD technology and also features low-pressure exhaust gas recirculation (LP EGR) to further optimize fuel efficiency.

The exhaust gas recirculation system returns some of the gas burnt by the engine to the combustion chamber, producing a cooling effect and reducing the emission of nitrogen oxides. The G1.6 T-GDi also features a low-pressure system that redirects the burnt emission gasses to the front of turbocharger compressor, rather than the intake system, to increase efficiency under the high load area.

Additionally, the new unit has an Integrated Thermal Management System that quickly heats or cools the engine to an optimal temperature; and a strong direct spray system that achieves 350bar, surpassing the 250bar of the previous T-GDi engine. In addition, engine friction is reduced by 34% by applying low friction moving parts.

The new Smartstream G1.6 T-GDi engine will be applied in the Hyundai Sonata Turbo, which is set for introduction in the second-half of this year. This premiere marks the first in a series of new Hyundai and Kia vehicles that will feature this new, efficient engine.



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The first truck engine maker to offer Continuously Variable Valve Duration (CVVD) technology, boosting power and efficiency some 5 percent, will be in possession of a game changer.

Japan Inc. has good reason to be scared to death of Korea Inc. Hyundai Group (Hyundai and Kia brands) is beginning to clean their clock.

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