Hyundai introduced the CVVD system: more power with less fuel consumption


The first engine CVVD will become the new petrol unit Smartstream G1.6 T-GDi turbo.

Hyundai Motor Group presented a system for changing the duration of opening of valves CVVD, or Continuously Variable Valve Duration. It is argued that this is the first such technology in the automotive market, reports the online edition of the with reference on 3dnews.

In internal combustion engines for power and fuel consumption are met by the system of variable valve timing, which adjusts the time of opening and height of valve lift during the four-stroke cycle. However, it is not able to regulate the duration the valve is open.

“CVVD system makes a new step in the development of this technology, offering the possibility to change the duration of valve opening depending on the requirements of the engine,” says Hyundai.

It is argued that the proposed solution allows to increase the engine power by 4% and reduce fuel consumption by 5 %. The volume of harmful emissions is reduced by approximately 12 %.

When the car is moving with a constant speed and the engine does not require a large capacity, CVVD keeps the intake valve open from the middle to the end of the compression stroke. This reduces fuel consumption by reducing resistance in compression.

And if the motor requires high power, for example, at high speeds, the intake valve closes at the beginning of the compression stroke to maximize the amount of air which participates in combustion of the fuel-air mixture, thus increasing torque for improved acceleration.

The first engine CVVD will become the new petrol unit Smartstream G1.6 T-GDi turbo. It provides the power of 180 horsepower, and torque reaches 265 N·m. This engine will be used in the model Hyundai Sonata Turbo, which should appear on the market in the second half of this year.


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