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Hyundai CVVD engine brings another dimension to valve timing

A new technology from Hyundai Motor Group places another marker on the march to more efficient internal combustion engines. Called Continuously Variable Valve Duration, the innovation permits two options for how long the intake valves remain open during the combustion cycle. The feature adds a third take on valve chicanery, atop variable valve timing that changes when valves open, and variable valve lift that changes how far valves open. Hyundai says the feature returns a 4% improvement in performance, a 5% increase in fuel economy, and lowers emissions by 12%. Hyundai applied for two patents on the valvetrain process in South Korea in 2011 and again in 2015. The altered valve duration in this latest iteration is made possible by two movable arms inside the camshaft. Each arm is anchored at its base to a pin at the center of the camshaft, while the end of each arm extends toward the edge of the camshaft. Changing the position of the pin in the center of the camshaft changes the angle of the arms relative to one another, which moves the camshaft along its mounting rod. Voila, a new intake cam profile that either lengthens or shortens valve overlap.   During low-speed spells at low load, CVVD opens the intake valve from the middle to the end of compression stroke. The weaker detonation isn't a factor at low load, and the reduced friction during compression improves fuel economy. During heavy engine loads, the intake valve closes at the beginning of the compression stroke to maximize the amount of air mixed for detonation, boosting torque. Four additional features enhance the benefits of CVVD. A more powerful direct injection system increases fuel spray pressure from 250 bar to 350 bar. Hyundai doesn't go into details on its Integrated Thermal Management System, but says the ITMS "quickly heats or cools the engine to the optimal temperature." Low-friction components lower overall engine friction by 34 percent. And a low-pressure exhaust gas recirculation layout diverts low-pressure exhaust gas from the traditional EGR route to the turbocharger compressor under high load for better fuel efficiency.   The first engine to boast the new tech is the Smartstream G1.6 T-GDi four-cylinder, which produces 180 horsepower and 195 pound-feet of torque. It will appear in the 2020 Hyundai Sonata Turbo going on sale in South Korea later this year.

Hyundai Sonata successor to seek evolution, not revolution

Hyundai hit a home run with its current-generation Sonata midsize sedan, so don't expect the Korean automaker to make revolutionary changes when its replacement comes out for the 2015 model year. The four-door sitting in showrooms today was launched in 2010 with radical new lines that marked a big departure from its rather bland predecessor. Even with stiff competition from the Honda Accord, Ford Fusion and Toyota Camry - all newer designs than the Sonata - sales have been strong. Consumers embraced its new design language, taking home a record 230,605 units last year.
"I think we found a design language that works, the 'Fluidic Sculpture' stuff, so I would say (the new styling) is not pulling back in any way. It's more continuing to refine on that same trajectory that we're on," John Krafcik, Hyundai U.S. CEO, told WardsAuto in a recent interview. Consumers don't seem to be fazed by the its age either. "A lot of consumers are just entering (the) midsize (segment) for the first time. They don't see (the Sonata) as a three-year-old car. They see it as, 'Whoa, that's a pretty good-looking midsize car,' so it's doing quite well," added Krafcik.
Sonota sales have been down over the last few months, but Krafcik says that is a reflection of the automaker's decision to increase production of its Elantra compact at the Montgomery, Alabama, plant - where both are built - and a limited supply of its mid-grade GLS Sonata model.

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