Hyundai opted to showcase its green side for the Paris Motor Show this year.

The Korean automaker has on display a 48-volt Hybrid version of its i40 and a New Generation i30 powered by compressed natural gas (CNG).

“Hyundai Motor is committed to creating sustainable mobility for European consumers,” said Allan Rushforth, Senior Vice President and COO, Hyundai Motor Europe. “Alongside our pioneering fuel cell program, we continue to develop vehicles that use new technologies and alternative fuels to reduce vehicle emissions and improve consumer’s experiences with Hyundai.”

The i40 48V Hybrid

The i40 48V Hybrid reduces CO2 emissions and fuel consumption significantly compared to the standard production model, said Hyundai, yet only costs a quarter of a full hybrid solution to build.

Hyundai explained this hybrid is based on a 1.7-liter diesel powered i40, the show car is equipped with a 48-volt lead-carbon battery, boosting power by 15 percent and reducing CO2 output by up to 20 percent.

Using a belt-driven starter generator (BSG) to replace the conventional alternator, the engine is said to be able to restart with almost no noise or vibration. Hyundai added the i40 48V Hybrid can operate in electric-only mode at low speeds and when cruising.

As with many hybrids, the lead-carbon battery pack recharges itself during deceleration through regenerative braking, with the BSG working as a generator. While accelerating, the BSG supports the engine with its additional 10 kilowatt to reduce fuel consumption and CO2-emissions, said Hyundai.

A lead-carbon battery was chosen Hyundai said due to excellent power-to-cost ratio, rapid charging capability and high levels of durability. It requires no active cooling system and can therefore be stored within the spare-wheel well, ensuring luggage space is not compromised. In addition, the lead-carbon battery is almost completely recyclable at the end of its lifecycle.

The company says the 48V Hybrid’s technologies are cost effective, have compact dimensions, apply a minimal weight penalty (just 46 kilograms), and can be easily introduced alongside existing powertrains. This means, it asserted, they could have far-reaching potential application in future Hyundai production cars.

New Generation i30 CNG

Hyundai explained the New Generation i30 CNG features a debut of the company’s new 1.4-liter T-GDI engine, combined to a new seven-speed dual-clutch transmission, as well as the latest application of its CNG research and development program.

When equipped with the new seven-speed dual-clutch transmission, the engine emits CO2 emissions as low as 87 g/km, said Hyundai, a significant reduction compared to the equivalent internal combustion engine (ICE) model, and meets the strict Euro6c emission standards three years ahead of introduction in 2017.

The CNG is stored, explained Hyundai, in a rectangular tank within the floor pan, ensuring interior space remains the same as its ICE counterpart. Lined with a gas-impermeable polyamide matrix (inside) and protected by high-performance glass-fiber reinforced plastic (outside), the new system provides a high-strength, low-cost solution to gas storage, and weighs 50 percent less than an equivalent steel tank.

Up to 15 kg of gas can be stored in the tank at 200 bar pressure, said Hyundai. A new electrical pressure regulator lowers gas pressure to an operable state in two steps, first to 20 bar and then to 4 to 11 bar, which is fed into the engine. The bi-fuel power plant uses both gasoline and compressed natural gas as fuel, with the flexibility to automatically switch to gasoline once the supply of CNG has been used.