29.03.2022 Press release

How Hyundai’s hybrid technology delivers an enhanced driving experience for TUCSON and SANTA FE customers

  • Hybrid and plug-in hybrid vehicles deliver lower emissions than pure internal combustion engine cars, as well as increased performance and efficiency
  • With around 44,000 units sold, the TUCSON Hybrid was the best-selling electrified Hyundai model in Europe in 2021
  • Hyundai’s 1.6 T-GDI ‘Smartstream’ engine features industry-leading CVVD technology

Press material

Consumer interest in hybrid vehicles has grown significantly in recent years. As well as delivering lower emissions than pure internal combustion engine (ICE) models, hybrid cars also deliver superior driving performance by adapting to all road environments and offering considerably more fuel efficiency.

According to the European Automobile Manufacturers’ Association (ACEA), sales of hybrid-electric vehicles (HEVs) increased by 60.5 per cent in 2021 compared to the previous year, overtaking diesel sales in the European Union for the first time. Meanwhile, plug-in hybrid-electric vehicles (PHEVs) experienced even more growth, as registrations increased 70.7 per cent year-on-year during the same period.

Hyundai currently boasts the widest range of electrified powertrains on the market, including a number of HEV and PHEV eSUVs. In 2021, the company sold 515,886 units in Europe, a 21.6 per cent increase compared to the previous year. Of these, 72,509 were zero-emission vehicles, which include battery-electric vehicles (BEVs) and fuel cell electric vehicles (FCEVs) – accounting for 14.1 per cent of sales in Europe.

Hyundai sold 109.84 per cent more models in 2021, compared to 2020. The best-selling electrified Hyundai model in Europe was the TUCSON Hybrid. Meanwhile, the company also saw a rise in PHEV sales – a 52.6-per cent increase compared to the previous year.

How HEVs and PHEVs work

The term ’hybrid’ signifies a vehicle that is outfitted with multiple combined power sources. An HEV features an ICE, an electric motor and a battery. HEVs are designed to sense exactly when the driver wants to accelerate. At lower speeds, only the electric motor is used. Accordingly, in scenarios where the driver accelerates harder or the vehicle requires more power, such as going up a hill, the ICE and the electric motor combine for the highest possible efficiency.

An HEV does not have to be plugged in to an external power source to recharge its battery. Instead, electric energy is generated through regenerative braking. It draws its power by converting any remaining kinetic energy left over while decelerating, braking or going downhill.

A PHEV, on the other hand, shares the same basic design as an HEV, while also offering some of the benefits of a BEV. Like an HEV, a plug-in hybrid-electric vehicle houses an ICE and electric motor but is also equipped with a bigger battery for an increased electrified range. In addition, these models are equipped with onboard chargers for additional charging via an external power source.

A PHEV can run purely on electric power, but will automatically switch over to use the ICE, depending on the road or the driving conditions. The ICE is a vital component because when the PHEV’s battery reaches a pre-set state of charge, it enables the car to enter a charge sustaining mode. When the battery is low, it will work in the same way as an HEV. The ICE powers the wheels as normal, while regenerative braking will supply power to recharge the electric battery. This extends the PHEV’s overall range.

In traditional ICE cars, power generated from the engine goes to the wheels through the transmission. Both HEVs and PHEVs are equipped with an additional electric motor between the internal combustion engine and the automatic transmission. The motor also generates power, which supports the engine and improves acceleration and fuel efficiency. Due to this, their power is generated from two sources and delivered to the wheels through the transmission.

Hyundai’s hybrid models do not feature a torque converter or a starting clutch, and instead, utilise a six-speed automatic transmission (6AT). With 6AT, drive off is managed with an electric motor.

In many HEV and PHEVs, the high-voltage battery required for driving is separated from the vehicle’s standard 12-volt lead-acid auxiliary battery. Hyundai’s HEV models integrate the two batteries, and they are installed under the second-row passenger seats. The 12-volt batteries of the PHEV models are in the underbody of the boot. The benefits for the brand’s eSUV customers are twofold. Firstly, this guarantees a greater volume of space in the trunk. Secondly, it ensures the centre of gravity is closer to the middle of the vehicle, which improves agility and driving performance.

Hyundai’s HEV and PHEV models

For enhanced performance and reduced emissions, both the TUCSON Hybrid and SANTA FE Hybrid are assembled with a powerful 230 PS hybrid powertrain, which is a combination of Hyundai’s 1.6‑litre T-GDi ‘Smartstream’ engine and a 44.2 kW electric motor. The hybrid powertrain draws its power from the association of the T-GDi engine and a 1.49 kWh lithium-ion polymer battery. Both models are available with two- or four-wheel drive.

Meanwhile, both the TUCSON PHEV and SANTA FE PHEV are also equipped with the 1.6‑litre T‑GDi ‘Smartstream’ engine. These models are paired with a 66.9 kW electric motor, which draws its power from a 13.8 kWh lithium-ion polymer battery. The total power output of both models is 265 PS, with a combined torque of 350 Nm. Each model is equipped with a four-wheel-drive as standard.

The TUCSON Plug-in Hybrid emits just 31 g/km of CO2 under WLTP driving conditions. Meanwhile, the SANTA FE Plug-in Hybrid emits 37 g/km of CO2 under WLTP conditions.

The drivetrains of the HEV and PHEV variants of both models are available with 6AT. Operated through shift by wire, meaning that the gear shift is controlled with an electrical button instead of the classical lever, 6AT was optimised for an ideal balance of performance and fuel efficiency.

Both the TUCSON Plug-in Hybrid and SANTA FE Plug-in Hybrid are equipped with a 7.2 kW respectively 3.3 kW onboard charger, for use at an EV charging station or via a home wall box. Bluelink® users can also check the battery charge level and manage the charging settings of both models via the app.

Hyundai’s 1.6 T-GDI ‘Smartstream’ engine features world-leading CVVD technology

Optimising the engine performance and fuel efficiency of Hyundai’s HEV and PHEV models even more is the 1.6 T-GDI ‘Smartstream’ engine. This features Hyundai Motor Group’s Continuously Variable Valve Duration (CVVD) technology, which was a world-first when it launched in 2019. The valve control technology regulates the duration the valve opens and closes, according to driving conditions.

When the vehicle is maintaining a constant speed and requires low engine output, CVVD holds the intake valve open until the middle of the compression stroke, and from that point closes it until near the end of the compression stroke. This helps to improve fuel efficiency by reducing the resistance caused by compression. Conversely, when engine output is high, for example when the car is driving at a high speed, the intake valve closes at the beginning of the compression stroke to maximise the amount of air used for the combustion. This enhances torque to improve acceleration.

CVVD is the only system that can change the duration of the valve opening whilst driving, depending on conditions. This technology increases performance by four per cent and fuel efficiency by five per cent while decreasing emissions by 12 per cent.

To further optimise fuel efficiency, the 1.6 T-GDI features Low-Pressure Exhaust Gas Recirculation (LP EGR). The LP EGR returns some of the gas burnt by the engine to the combustion chamber, producing a cooling effect and reducing the emission of nitrogen oxides. The 1.6 T-GDI also features a low-pressure system that redirects the burnt emission gas to the front of the turbocharger compressor, rather than the intake system, to increase efficiency under high load conditions.

For even more assurance for its customers, Hyundai undertakes a vast number of safety performance tests on its HEV and PHEV models’ lithium-ion polymer batteries during development. The company is also focused on enhancing battery safety and conducts extreme crash tests to test the three safety features of the batteries: a ceramic coating separator, structures to protect the battery from physical damage, and battery controllers.

Disclaimer: Fuel consumption and emissions data

  • Fuel consumption combined for the Hyundai TUCSON 1.6 T-GDI Hybrid with 6AT 2WD in l/100 km: 5.9 - 5.5; CO2 emissions combined in g/km: 135 - 125 (WLTP)
  • Fuel consumption combined for the Hyundai TUCSON 1.6 T-GDI Hybrid with 6AT 4WD in l/100 km: 6.6 - 6.2; CO2 emissions combined in g/km: 149 - 140 (WLTP)
  • Fuel consumption combined for the Hyundai TUCSON 1.6 T-GDI Plug-in Hybrid with 6AT 4WD in l/100 km: 1.4; CO2 emissions combined in g/km: 31 (WLTP)
  • Fuel consumption combined for the Hyundai SANTA FE 1.6 T-GDI Hybrid with 6AT 2WD in l/100 km: 6.9 - 6.4; CO2 emissions combined in g/km: 157 - 146 (WLTP)
  • Fuel consumption combined for the Hyundai SANTA FE 1.6 T-GDI Hybrid with 6AT 4WD in l/100 km: 7.6 - 6.9; CO2 emissions combined in g/km: 172 - 157 (WLTP)
  • Fuel consumption combined for the Hyundai SANTA FE 1.6 T-GDI Plug-in Hybrid in l/100 km: 1.6; electricity consumption combined in kWh/100 km: 18.1; CO2 emissions combined in g/km: 37 (WLTP)


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