Motor Group has developed the world’s first Continuously Variable Valve
Duration (CVVD) technology to feature in future Hyundai and Kia vehicles. The
innovation was revealed at Hyundai Motor studio Goyang alongside the
Smartstream G1.6 T-GDi the first engine to feature the technology.
optimises 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 fuel efficiency. Furthermore, the
technology cuts emissions by 12%.
development of the CVVD technology is a good example how Hyundai Motor Group is
strengthening our powertrain technology,” said Albert Biermann, President and
Head of Research and Development Division at Hyundai Motor Group. “We will
continue our innovation efforts to bring forth paradigm shifts and ensure
sustainability of our business model,” he added.
Innovation: Continuously Variable Valve Duration
now, an internal combustion engine 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.
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.
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
alongside the new CVVD technology is the new Smartstream G1.6 T-GDi Engine, a
V4 gasoline turbo unit with 180 horsepower and 27.0kgm of torque. The new
powertrain is the first to utilise the Group’s new CVVD technology and also
features Low-Pressure Exhaust Gas Recirculation (LP EGR) to further optimise
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 gas to the front of the turbocharger compressor, rather
than the intake system, to increase efficiency under the high load condition.
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% with the application of low
friction moving parts.
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