The 2011 Hyundai Sonata Hybrid is the Korean company's first shot at the hybrid segment and it's not messing around. The Sonata Hybrid boasts the highest combined horsepower output of any hybrid sedan in its class and an expected best-in-class EPA highway rating of 39 mpg, not to mention the first use of lithium-polymer batteries in the automotive industry. That's pretty strong out of the gate.
Here are the basics: The Sonata Hybrid combines Hyundai's 169-horsepower, 2.4-liter Theta II inline-4 with a 30-kilowatt electric motor. This particular Theta engine runs on the Atkinson cycle and uses continuously variable valve timing along with several friction-reducing technologies to boost efficiency by 10 percent compared to the standard Theta power plant. This hybrid powertrain's combined output of 209 hp tops all sedans in the class, while the Sonata Hybrid also happens to be one of the lightest midsize hybrid sedans at 3,457 pounds.Like the Toyota Camry and Ford Fusion hybrids, the Sonata Hybrid can run on electric power alone, but Hyundai also claims its car can achieve 100 km/h (62 mph) in the electric mode. This is one of the reasons why the Sonata delivers such an impressive highway mileage number. The six-speed automatic transmission comes from Hyundai, but this application puts an electric motor in place of the torque converter, creating a hybrid powertrain that is more efficient and less costly than the CVTs used by its competitors, Hyundai says. More conventional elements of the Sonata Hybrid include a regenerative brake system, start/stop technology and an electric air-conditioning compressor.
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You might not recognize the phrase "lithium polymer" in reference to the Sonata's batteries, as this is the first automotive application of the technology. Hyundai says the batteries are smaller, lighter and more durable than both nickel-metal hydride and lithium-ion batteries. For instance, the Sonata's battery pack weighs 28 pounds less than the one used in the Toyota Camry. It's also easier to package, which results in less intrusion into the trunk area.
In order to visually differentiate the Sonata Hybrid from the conventional Sonata, Hyundai has added a unique front fascia with a hexagonal grille, revised rocker panels, unique wheel designs and, of course, plenty of hybrid badging. Inside the cabin, the Sonata Hybrid also includes a technology display that gives drivers information on the available charge, power flow through the drive system and overall efficiency. It uses pretty colors to display it all, too.
