Quicker shift times in future Kia/Hyundai hybrids with Active Shift Control

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The beginning of the computer age in the 1980s saw the rapid development of electronic systems for management of many different functions in cars. This led to significant leaps in performance and efficiency as computers could calculate at thousands of times a second, making adjustments to match operating conditions precisely.

One area where such lightning-fast management was valuable was in the automatic transmission. The transmission control unit (TCU) worked with the Engine Control Unit (ECU) to coordinate gearshifts and as technology advanced, to eliminate the parasitic power losses.

Optimizing transmission efficiency
Now the Hyundai Motor Group has developed the world’s first Active Shift Control (ASC) transmission technology for future Kia and Hyundai hybrid models. The innovation optimizes transmission efficiency by monitoring the rotational speed of transmission with a sensor installed inside the electric motor at 500 times per second to quickly synchronize the rotational speed with that of engine.

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 gearshift time by 30%. With the synchronization, shift time is reduced from 500 ms to 350 ms, increasing smoothness.

“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.”

Development of the ASC technology is completed and is ready to be used in future Kia and Hyundai hybrid models.

Independently developed control logic software
Conventional hybrid vehicles do not have torque converters 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 technology allows the hybrid’s electric motor to also take control of gearshifts by applying new software logic to the Hybrid Control Unit (HCU) to mitigate issues with slower shift time. This not only improves a hybrid vehicle’s acceleration performance and fuel economy, but also durability of the transmission by minimising friction during gearshift.

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