Thursday, 19 July, 2018

Diesel hybrid to join Kia powertrain line-up

Kia 48V Mild Hybrid Diesel powertrain Kia 48V Mild Hybrid Diesel powertrain
Orlando Vargas | 15 May, 2018, 23:00

The powertrain, dubbed EcoDynamics, will reduce Carbon dioxide emissions of the Sportage by aiding acceleration with electric power from its additional 48-volt battery, and using a mild-hybrid starter-generator (MHSG) unit to extend the time that the diesel engine is not under load.

Kia say the new 48V mild-hybrid system means "Kia is the first manufacturer to offer consumers hybrid, plug-in hybrid, battery-electric and 48-volt technology across its model line-up".

Kia says the system is compatible with both manual and automatic transmissions, and with the former will reduce Carbon dioxide emissions by up to 4% in the upcoming WLTP test, and by 7% under the current NEDC test.

The system incorporates a 48v battery with a starter generator unit, similar in principle to the tech used current vehicles as wide-ranging as the Suzuki Ignis and the Audi A8. On most vehicles the battery will be located under the boot floor minimising any space penalty.

The 48V battery's DC/DC converter enables the new battery to connect to the vehicle's on-board power supply, leading to a significant reduction in the size of the 12V battery required to power the car's ancillary electronics.

The MHSG is mounted in the engine bay and connected to the crankshaft by a belt.

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Kia did not say how much range the Sportage will have with the engine switched off when using the system. When coasting, or braking, it switches to "generator" mode to recharge the battery.

The system makes use of a moving start-stop function, meaning that when it detects the battery has sufficient charge, the combustion engine turns off automatically during in-gear deceleration and braking.

The diesel mild-hybrid powertrain is compatible with both manual and automatic transmissions, and could be adapted for front-, rear- and all-wheel drivetrain layouts. And while debuting on a diesel engine, it will be adapted for petrol units.

South Korean automaker Kia Motors will introduce its first 48V diesel hybrid powertrain later this year.

Although it hasn't gone into detail as to what diesel engine will be part of the system, Kia has revealed that electrification will come in the form of a 48-volt battery powering a starter generator, allowing extended engine "off time" at lower speeds.

The carmaker says more details about the hybrid and its implementation will be released "in due course", at first for the United Kingdom market.

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