Hyundai Motor Group has developed the first-ever active shift control (ASC) transmission system. The technology optimizes transmission efficiency by monitoring gear shifts 500 times per second, adjusting the transmission rotation speed for faster shift times.
Developed for application in upcoming Kia hybrid models, ASC technology allows the hybrid’s electric motor to also take control of gear shifts by applying new software logic to the hybrid control unit (HCU) to mitigate issues with slower shift time.
The HCU monitors the rotational speed of transmission 500 times per second with a sensor installed inside the e-motor to quickly synchronize the rotational speed with that of engine.
With synchronization, shift time is reduced by 30% from 500ms to 350ms. This not only improves hybrid vehicles’ acceleration performance and fuel economy, but also durability of the transmission by minimizing 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, VP 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.”