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Hyundai unveils first CVVD engine technology for vehicles

DUBAI, July 7, 2019

Hyundai Motor Group said it has developed the world’s first continuously variable valve duration (CVVD) technology to feature in its future models.

The innovation was recently revealed at the Hyundai Motorstudio Goyang, alongside the Smartstream G1.6 T-GDi the first engine to feature the technology, said a statement from the company.

CVVD 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 per cent boost in performance and a 5 per cent improvement in fuel efficiency. Furthermore, the technology cuts emissions by 12 per cent, it said.

Albert Biermann, president and head of research and development division at Hyundai Motor Group, said: “The development of the CVVD technology is an opportunity for Hyundai Motor Group to take the lead in powertrain innovation.”

“We will continue our innovation efforts to bring forth paradigm shifts and ensure sustainability of our business model,” he stated.

Until 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.

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, said the statement from Hyundai.

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 maximise the amount of air used for the explosion, enhancing torque to improve acceleration.

Unveiled alongside the new CVVD technology is the new Smartstream G1.6 T-GDi Engine, a V4 gasoline turbo unit with 180 horsepower and 27.0kg of torque, it stated.

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 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, said the Hyundai statement.

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, it added.-TradeArabia News Service




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