Hyundai’s First-Ever Active Shift Control To Enhance Hybrid Transmissions

Hyundai Motor Group Kia First-Ever Active Shift Control Transmission Technology Enhance Fuel Economy Driving Dynamics Hybrids

Hyundai Motor Group today announced it has developed the world’s first Active Shift Control (ASC) transmission technology for hybrid vehicles. The new ASC system innovation optimises transmission efficiency by monitoring gear shifts 500 times per second, precisely adjusting the transmission rotation speed to for faster shift times, the company noted. This new technology will premiere in upcoming Hyundai and Kia hybrid vehicles, it said.

The ASC transmission technology has been developed in-house, and is claimed to be the world-first technology that improves gear-shift efficiency for hybrid vehicles. Hyundai has now set this system for mass production. ASC applies new control logic software to the Hybrid Control Unit (HCU), which then controls the electric motor to align the rotational speeds of the engine and transmission to reduce gear shift time by 30 %. The technology also delivers smoother gear changes despite quicker shift times, explained Hyundai.

Conventional hybrid vehicles do not have torque converters in order to further improve fuel economy as torque converters lose energy during the process of transmission. Although fuel efficient, such a system also requires longer shift times to ensure smoother gear changes, explained Hyundai. In terms of the ASC technology, it allows the hybrid’s electric motor to also take control of gear shifts by applying software logic to the HCU to mitigate issues with slower shift time. The HCU monitors the rotational speed of transmission with a sensor installed inside the electric motor at 500 times per second to quickly synchronise the rotational speed with that of engine.

KyoungJoon Chang, Vice-President and Head, Powertrain Control System Group, Hyundai Motor Group, said development of the world’s first ASC technology is a remarkable innovation which incorporates precise motor control to automatic transmission. It will not only save fuel but also provide a more fun driving experience for customers, he added.