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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 shoots down the rumor claiming it is done developing engines

Hyundai has clarified that the recent rumor claiming it had stopped developing gasoline- and diesel-burning engines to focus on various forms of electrifications is false. It said that development work remains on-going and that the internal combustion engine still has a future. "Hyundai Motor Group can confirm that it is not halting the development of its engines following recent media speculation. The Group is dedicated to providing a strong portfolio of powertrains to its global customers, which includes a combination of highly efficient engines and zero-emissions electric motors," said senior group manager Michael Stewart in an interview with Motor1. The report that emerged in late 2021 claimed that the Hyundai Group (which includes the Hyundai brand, Kia, and Genesis, among other entities) had completely stopped designing piston-powered engines to focus on electrification. It claimed that most of the engineers had been assigned new roles related to electrification, though it also noted that some were staying behind to continue refining the technology. If this sounds familiar, it's likely because Hyundai recently shot down a separate but similar rumor that said it had put the hydrogen-electric powertrain it planned to install in many of its cars (including some upmarket Genesis models) on hiatus. The carmaker explained that it has merely reshuffled the team that's developing the technology because unspecified technical hurdles have slowed down the project. Several electric Hyundai models are in the pipeline, including the production version of the Prophecy concept unveiled in 2020 and a relatively big SUV previewed by the 2021 Seven concept. But, its comments suggest that more gasoline-powered models are on the way as well, which is great news; its range of N-tuned high-performance models includes excellent cars and there's still room for it to grow. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

Did a US automaker blow the whistle on Hyundai, Kia fuel economy issue?

In all of the most hotly contested mainstream segments of the motoring universe, the difference of one mile per gallon averaged on a widow sticker can mean the difference between a sale and a walk-off - to say nothing of two or three mpg. So, when Hyundai and Kia were forced to reveal that many of their 40-mpg ratings were actually 38s and 37s, well, it made for big news.
It also, conceivably, made for a competitive disadvantage immediately, when the Korean automakers' products were being shopped versus the guys down the block. And it's that disadvantage that makes a recent story from Automotive News so juicy.
AN is reporting that Margo Oge, former head of the Environmental Protection Agency's Office of Transportation and Air Quality, got a tip in 2010 that Hyundai/Kia were "cheating" to get its impressive fuel economy numbers. The tip, said Oge (who retired from the EPA this past September), came from a senior vice president from a domestic automaker. The source was credible enough for Oge to launch an audit of the Hyundai figures, which ultimately lead to the debacle that we reported on a few months ago, and that the Korean company has been trying to bounce back from ever since.