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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 and Kia recalling 1.6M more models for faulty brake switch

In what is likely the largest recall campaign for Hyundai and Kia, the National Highway Traffic Safety Administration has announced a recall of more than 1.6 million models due to a faulty brake switch. This is in addition to almost 700,000 Hyundai and Kia models recalled for the same problem back in 2009.
In more than 620,000 Kia models and 1 million Hyundai products for the 2007 through 2011 model years, the brake switch could malfunction causing the brake lights to not illuminate, which could lead to accident. Other possible issues with a faulty switch include the cruise control not cancelling with the brake pedal, the push-button starter not working properly and the shift interlock not disengaging causing the transmission to be stuck in Park. To fix the problem, the brake lights switch will be replaced.
Due to the large number of units being recalled, both automakers are issuing a notice by next month with parts not expected to be ready until June. The full list of affected vehicles and the NHTSA press releases are posted below.

NHTSA looking into non-Takata airbag shrapnel case

The global airbag inflator recall from Takata has been one of the biggest topics in auto safety for months. Now, the National Highway Traffic Safety Administration is opening a preliminary evaluation into the components from Arc Automotive to investigate whether two reported ruptures and two injuries signal a wider problem. So far, only the 2002 Chrysler Town & Country and 2004 Kia Optima are believed to be affected. If a safety campaign is deemed necessary, it could cover an estimated 420,000 of the minivans and 70,000 of the Korean sedans. NHTSA first noticed these ruptures in December 2014. The agency received a complaint of a 2009 case in Ohio about the bursting of the driver's side inflator in a 2002 Town & Country. According to the report, the incident broke the woman's jaw and sent shrapnel into her chest. The government investigated the case, and this was found to be the only known occurrence in these vehicles. The analysis indicated the part's gases were possibly blocked somehow and caused the component to explode. FCA US spokesperson Eric Mayne told Autoblog that the company is "cooperating fully" with NHTSA. "Also, we no longer use that inflator," he said. A second incident came to NHTSA's attention in June 2015 with the driver's side rupture in a 2004 Optima in New Mexico. The agency lists fewer details about the case, and a root cause isn't known. This is also the only currently known example in a Kia vehicle. According to a statement from Kia to Autoblog, "We are taking this matter very seriously and support NHTSA's action and will continue working cooperatively with the agency and suppliers throughout the process." Arc's components are sealed within a steel housing that's meant to protect them from "external atmospheric conditions," according to NHTSA. Multiple suppliers also use them. In the Chrysler, the airbag module came from Key Safety Systems and from Delphi in the Kia. In a statement to Autoblog the company said, "We have received NHTSA's notification and are cooperating fully with its Preliminary Evaluation." At this time, NHTSA admits that it doesn't know for certain whether these two cases are linked. The agency is conducting this preliminary evaluation to learn more.