Hyundai’s IVT- The choice for maximum fuel economy

From Hyundai Press Release

Hyundai Motor Group has become a global powertrain company, thanks to Hyundai Transys – a merger of Hyundai Powertech and Hyundai Dymos. The Group now boasts the commendable capability of designing and building its own IVT (Intelligent Variable Transmissions).

With the merger, Hyundai Transys has the capability of producing novel transmissions with diverse structures. It is currently the only company in the world to comprehensively possess the technology for all transmission types, which is constantly evolving in tandem with the performance and technology advancement of engine development.

One of the most recent IVT developments and which is currently fitted into the new Elantra, is the Smartstream 8-speed IVT. The Smartstream IVT uses the characteristic of high-efficiency CVTs (Continuously Variable Transmission) as the foundation and improves on it by amending the responsiveness and gear-shifting feel.

The IVT provides a solution for conventional CVT pulleys and belt that often slip against each other, which is particularly visible in metallic belts. The IVT uses a chain belt instead of a metallic belt, which is the first of its kind in the segment. The chain belt’s main selling point is that it uses the belt tension to adjust the pulley diameter, thus eliminating instances of slippage and improving efficiency in power delivery. The chain belt also has a longer lifespan and is maintenance free, which makes it more reliable.

The Smartstream IVT reproduces the manual transmission’s shifting pattern that better reflects the driver’s intent and driving conditions, making it feel more responsive in general. This is compared to the setback of conventional CVTs which keep the engine RPM (Revolutions Per Minute) fixed while increasing the vehicle speed, making the drivers feel as if the engine is running idle.

The Smartstream IVT that is fitted into the new Elantra has shown a 4.2% improvement in fuel economy and a 5~8% reduction in engine power loss.

Paired with a SmartStream G1.6 MPi petrol engine, the new Elantra is capable of producing 123 of horsepower at 6,300rpm and a peak torque of 154Nm at 4,500rpm. The Smartstream G1.6 MPi is a four-cylinder engine which features continuously variable valve timing and multi-port injection as well as a new thermal management module.

The Smartstream powertrain is Hyundai Motor’s response to global efforts to safeguard the environment as well as to meet customers’ demand for fun-to-drive cars. It is designed to deliver improved fuel economy and reduced exhaust emissions. The word ‘Smart’ implies being intelligent in design, control and operation, while ‘Stream’ refers to dynamic movement of mobility.