Hyundai develops CVVD engine technology

CHENNAI: Hyundai Motor Group has developed the first Duration of the continuously variable valve ( CVVD ) technology to feature in future Hyundai and Kia vehicles. The innovation was revealed alongside the Smartstream G1.6 T-GDi - the first engine to feature the technology - at Hyundai Motorstudio Goyang on Wednesday.

CVVD optimizes both engine performance and fuel efficiency while also being eco-friendly.

The valve control technology regulates the duration of opening and closing of the valve according to driving conditions, achieving a 4% increase in performance and a 5% improvement in fuel efficiency. In addition, the technology reduces emissions by 12%.

The development of the CVVD technology is a good example of how Hyundai Motor Group is strengthening our powertrain technology, said Albert Biermann, president and head of research and development division at Hyundai Motor Group.nWe will continue our innovation efforts to bring forward paradigm shifts and ensure sustainability of our business model, he said.

So far, the performance and efficiency of an internal combustion engine have been governed by the variable valve control technology that adjusts the opening and closing time of the valve and the depth of the valve opening, with the power of the valve. engine produced through the intake-compression-expansion-exhaustion cycle of the fuel.

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 valves could not regulate valve duration, as the valve was 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 maintained at constant speed and requires low engine output, CVVD opens the intake valve from the middle to the end of the compression stroke. This helps improve fuel efficiency by reducing the resistance caused by compression.

On the other hand, when the engine output is high, such as when the car drives at high speed, the intake valve closes at the beginning of the compression stroke to maximize the amount of air used for the explosion, which improves 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 27.0kgm of torque. The new powertrain is the first to use the Group's new CVVD technology and also features Low-Pressure Exhaust Gas Recirculation (LP EGR) to further optimize fuel efficiency.

The recirculation system of the exhaust gases returns part of the gas burned by the engine to the combustion chamber, producing a cooling effect and reducing the emission of nitrogen oxides. The G1.6 T-GDi also has a low pressure system that redirects the burned emission gas to the front of the turbocharger compressor, instead of the intake system, to increase efficiency under high load conditions.

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

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 will mark the first in a series of new Hyundai and Kia vehicles featuring the engine. Information on first Kia vehicle to feature the engine will be revealed later.