Published: Wed, May 16, 2018
Sci-tech | By Carrie Guzman

Kia reveals diesel mild-hybrid powertrain

Kia reveals diesel mild-hybrid powertrain

Kia has announced plans to introduce new mild hybrid technology to its line-up, similar to the drivetrains now utilised by Audi. This allows the internal combustion engine to automatically turn off during braking and in-gear deceleration, whereas the MHSG can re-ignite it whenever the driver presses the throttle.

The electrified models will be two of 16 new advanced-powertrain vehicles Kia will introduce by 2025, including a electric version of Kia's Niro SUV later this year.

It features an electric motor that provides up to 10kW of extra power, reducing the diesel engine's workload during acceleration.

The company claims thats integrating the EcoDynamics+ mild-hybrid system into the existing architecture "is relatively straightforward".

The new hybrid system will be presented in the second half of the year.

In "motor" mode the battery is discharged under acceleration, providing additional torque to the engine for a slight boost in performance under hard acceleration.

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When decelerating, an inverter switches the current of the motor, effectively turning it into a generator to top up the 0.46kWh battery. The 48 volt generator recharges the vehicle's battery when the diesel engine is running.

Kia says the starter-generator unit can seamlessly switch from providing up to 13bhp of assistance via a belt that drives the crankshaft to recuperating energy from engine braking.

Controlled by an advanced ECU, the powertrain benefits from a new "Moving Stop & Start" function. And because the 48V battery connects to the car's on-board power supply it means a smaller 12v battery and starter motor. Charge from the 48V battery helps to start the engine in most conditions.

Kia hasn't released any specs yet, but says that the 48V battery will be located beneath the boot floor, at least in the case of the Sportage. The adoption of the MHSG also means the conventional starter motor can be downsized and used primarily for cold starts at low temperatures. And while debuting on a diesel engine, it will be adapted for petrol units.

Kia is introducing EcoDynamics+ 48V mild-hybrid diesel engines to their United Kingdom range later this year in a bid to reduce emissions.

More detailed plans for the roll-out of its new mild-hybrid technology in the United Kingdom will be announced by Kia in due course.

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