The world’s first Continuously Variable Valve Duration (CVVD) technology has been developed by Hyundai Motor Group for featuring in future Hyundai Vehicles. The oddity was divulging at Hyundai Motor studio Goyang alongside the Smart stream G1.6 T-GDi the first engine to feature the technology on Wednesday.
CVVD enhance both engine performance and fuel efficiency while also being eco-friendly. The valve control technology adjust the duration of valve opening and closing according to driving conditions, achieving a 4% boost in performance and a 5% improvement in fuel efficiency. Furthermore, the technology cuts emissions by 12%.
“With the development of the CVVD technology Hyundai Motor Group will become the pioneer in power train innovation” said Albert Biermann, President and Head of Research and Development Division at Hyundai Motor Group. “We will persist our innovation efforts to bring forth paradigm shifts and ensure stability of our business model.”
Innovation: Continuously Variable Valve Duration
As of now, an internal combustion 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 and 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. On the other hand, 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, enhancing torque to improve acceleration.
Smartstream G1.6 T-GDi Engine
A new Smartstream G1.6 T-GDi Engine, a V4 gasoline turbo unit with 180 horsepower and 27.0kgm of torque was unfurl alongside the new CVVD technology. 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 emission if nitrogen oxides and producing the cooling effect can be made resending some gas burnt by the engine to the combustion chamber. This can be made possible by the exhaust gas recirculation system. The G1.6 T-GDi also features a low-pressure system that redirects the burnt emission gas to the front of the turbocharger compressor, rather than the intake system, to increase efficiency under the high load condition.
Moreover, the newly initiated unit has an Integrated Thermal Management System by which the heating and cooling of the engine can took place in an optimal temperature, and a strong direct spray system that achieves 350bar, surpassing the 250bar of the previous T-GDi engine. Low friction moving parts will reduce the engine friction by 34%.