Volkswagen has introduced a new full hybrid drive system that integrates temporary electric operation with notable efficiency and extended range. This advanced technology is set to debut in the Golf Hybrid and T-Roc Hybrid, with availability commencing in the fourth quarter of the year. Unlike conventional plug-in hybrids, these new models do not require external charging cables or infrastructure. Instead, energy for electric-only driving is recuperated on board via regenerative braking and a turbocharged petrol engine paired with a generator. The system will be available in two output variants and is engineered to deliver lower fuel consumption than mild-hybrid configurations.
The new full hybrid drive system provides several distinct advantages. Compared to mild hybrid technology, it enables a higher proportion of electric driving, resulting in lower emissions, improved fuel efficiency, and reduced operating costs. In contrast to externally rechargeable plug-in hybrids, the new system offers a lower purchase price and eliminates the need for charging infrastructure. Within the Golf lineup, the hybrid variant is designated simply as ‘Hybrid,’ effectively bridging the gap between the existing ‘eTSI’ mild hybrid and the plug-in hybrid models, which are marketed as ‘eHybrid’ or as the performance-oriented GTE. This approach enables Volkswagen to broaden its range of electrified powertrains, offering a tailored solution for varying customer requirements alongside the all-electric ID. series.
The innovative full hybrid module drives the front axle and comprises several key components: a hybrid module, a turbocharged petrol engine (TSI), and a lithium-ion battery. The hybrid module incorporates a primary electric motor for propulsion, a secondary electric motor that functions as a generator, power electronics, a differential, and a single-speed gearbox. An electronically controlled multi-plate clutch, managed by its own control unit, facilitates the engagement and disengagement of the TSI engine within the drivetrain. The system also features an electric air conditioning compressor and an electric brake servo, both integrated into the vehicle’s front end. The high-voltage battery, utilising NMC cell technology and offering a gross capacity of 1.6 kWh—typical for hybrid electric vehicles (HEVs)—is installed in the vehicle floor at the rear of both the Golf and T-Roc models.
Volkswagen has engineered the interplay between the turbocharged 1.5 TSI evo2 engine, dual electric motors, and a high-voltage battery to optimize efficiency, dynamic performance, and ride comfort. The primary electric motor can either supplement or entirely replace the petrol engine during specific operating phases, thereby enhancing efficiency. As a result, the Golf Hybrid and T-Roc Hybrid frequently operate in electric-only mode, particularly during start-up, low-speed driving, and urban transit, contributing to impressively quiet operation. The hybrid drive system features three distinct operating modes, which are automatically selected by the vehicle based on driving conditions and user profile:
- Electric Motor Propulsion: At low speeds, the vehicle is powered exclusively by the electric motor while the TSI petrol engine remains disengaged.
- Serial Drive: In this mode, the electric motor propels the vehicle, while the TSI engine operates independently as a generator to supply additional energy to the electric motor. This arrangement extends the electric driving range by enabling the petrol engine to recharge the battery under optimal conditions.
- Parallel Drive: Above approximately 60 km/h, particularly on country roads and highways, the TSI petrol engine serves as the primary propulsion source. The electric motor assists the engine, providing additional power during acceleration and enhancing overall performance.
Drivers of the new Golf Hybrid and T-Roc Hybrid can select from three driving profiles: Eco, Comfort, and Sport. The Eco mode restricts system output to 70 per cent and disables the boost function, prioritising energy conservation. Comfort mode provides unrestricted output and permits the use of boost. Sport mode delivers a more dynamic driving experience by shifting to serial mode earlier, ensuring rapid access to maximum power when required.
Details regarding UK specifications, pricing, and availability for these models are expected to be announced in the near future.
