Kia's Active Shift Control improves gear shift efficiency by 30%, improving fuel economy for hybrid vehicles and is now set for mass production.


Hyundai Motor Group, Kia Motors parent company, has developed the world's first Active Shift Control (ASC) transmission technology. The innovation optimises transmission efficiency by monitoring gear shifts 500 times per second, precisely adjusting the transmission rotation speed to for faster shift times. The new technology will benefit upcoming Kia hybrids.

The world's first Active Shift Control will reduce hybrid gear shift times by up to 30%, providing improved fuel economy 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.

ASC overcomes this compromise by applying 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 times by 30%. This not only improves a hybrid vehicle's acceleration performance and fuel economy, but also durability of the transmission by minimising friction during gear shift.

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