ZF Unveils 8hp Evo Hybrid Transmission

ZF has unveiled two new hybrid technologies as part of its strategy to meet the increasing global demand for diverse electrified powertrain solutions. ZF has introduced the 8hp evo – an advanced concept version of its successful 8-speed automatic transmission – alongside a new generation of electric range extender systems designed to address range anxiety in battery electric vehicles (BEVs).

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The 8hp automatic transmission has long been a mainstay in ZF’s portfolio, supporting both internal combustion engines and hybrid powertrains. With the 8hp evo, ZF has significantly advanced the transmission’s electrification capabilities. The upgraded system features improved electric motors, enhanced power electronics, and software-level optimisations drawn from the company’s experience with fully electric drivetrains. 

In plug-in hybrid (PHEV) applications, the 8hp evo boosts maximum electric output from 214 bhp to 268 bhp, and torque from 500 Nm to 600 Nm. Transmission input shaft losses have been reduced by 28 per cent, translating to improved energy efficiency. Depending on the vehicle and battery configuration, these enhancements can offer up to 10 per cent additional electric-only range.

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The new variant is also compatible with full hybrid electric vehicle (HEV) platforms operating at 400V, which do not rely on external charging. Unlike 48V mild hybrids, HEVs using the 8hp evo can support pure electric driving under certain conditions, using regenerative braking and combustion engine power to recharge the battery. ZF is targeting the growing demand for such systems in markets like the United States, where infrastructure for charging may still be limited in certain regions.

Alongside the 8hp evo, ZF is also developing the next generation of electric range extender systems, positioned as a solution for overcoming range limitations in BEVs. These systems consist of a small combustion engine coupled with an electric generator to recharge the battery, offering extended driving range without reliance on external charging. 

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The new offerings – the eRE and eRE+ – are modular and highly integrated platforms. The eRE includes an electric generator, integrated inverter, and planetary gearbox, all controlled by ZF’s proprietary software. The eRE+ adds an intelligent clutch and differential, allowing the electric motor to act as a secondary drive unit. This provides temporary electric all-wheel-drive capability without the need for a second electric motor.

Both range extender systems are scalable and adaptable to 400V and 800V vehicle architectures and various semiconductor technologies. This flexibility enables OEMs to reduce development time, simplify supply chain logistics, and lower platform costs. ZF notes that these systems are especially attractive to new entrants in the EV space, who may lack in-house expertise in combustion technology, while also benefiting established automakers looking to optimise battery size and emissions compliance.