The era of electric vehicles (EVs) is unfolding rapidly, but the transition isn’t as simple as it seems. While charging stations are increasingly available in urban areas, rural and remote regions still lack adequate infrastructure. Even long-distance travel remains stressful due to limited charging options. In this context, the concept of the Extended-Range Electric Vehicle (EREV) is once again drawing attention.
One of the most notable developments in this area comes from HORSE Powertrain, a joint venture between Renault and Geely. This collaboration is reinventing the EREV system through a completely new architecture, attracting global interest in the automotive industry.
What is an EREV?
An EREV, or Extended-Range Electric Vehicle, is a type of EV that primarily drives using electric power, but when the battery runs low, a small internal combustion engine acts as a generator to produce electricity. Unlike traditional hybrids, the engine in an EREV does not power the wheels. Instead, it recharges the battery, allowing the vehicle to maintain a true EV driving experience. This distinction from conventional plug-in hybrid electric vehicles (PHEVs) is significant.
HORSE Powertrain’s Structure: A Generator Module for EVs
Renault and Geely have elevated the EREV concept with the HORSE Powertrain system, which integrates the engine, generator, reducer, control units, and cooling system into a single, unified module. Designed like a plug-and-play device, this unit can be slid into existing EV platforms without the need for a complete platform overhaul. For automakers, this means massive cost savings and greater flexibility in adapting to market demands, as they can easily create EREV variants from existing EV models.
Why a Gasoline Engine Instead of Diesel?
The generator engine in the HORSE Powertrain uses a gasoline-based spark ignition system, rather than a diesel engine. This choice is due to several factors: gasoline engines are generally quieter, lighter, and easier to control in terms of emissions. Because the generator doesn’t drive the wheels but only produces electricity, compactness and efficiency are key. It typically runs at a fixed, optimized RPM range (e.g., 1800–2500 rpm), which makes it ideal for integration into small vehicles without excessive weight or complexity.
Looking forward, the system is designed with fuel flexibility in mind. The engine could potentially be adapted to run on ethanol, methanol, synthetic fuels (e-fuels), or even hydrogen. This offers future-proofing in line with global carbon neutrality goals and the ongoing transition away from fossil fuels.
Is Unlimited Range Really Possible?
Now, can an EREV run indefinitely if you keep refueling it? In theory, yes—but there are practical limitations. Fuel tank capacity, generator output, engine operating time, cooling system efficiency, and regional emissions regulations all place limits on performance. Therefore, while EREVs offer reliable coverage for both city driving and long-distance travel, they are best seen as a pragmatic compromise that eases range anxiety and reduces reliance on charging infrastructure.
The Industry's First Slot-In Module
The most groundbreaking aspect of HORSE’s system is its slot-in module design. Previous EREV implementations often involved retrofitting engines into existing EVs or adapting hybrid platforms. For example, the BMW i3 REx used a small scooter engine, while GM’s Volt evolved from a conventional hybrid. In contrast, the HORSE Powertrain is purpose-built as an EV-compatible generator module, allowing automakers to seamlessly produce EREV versions without a full redesign. This level of modular integration is considered a first in the industry.
Aramco’s Investment and the Strategic Role of EREV
Adding to its significance, Saudi oil giant Aramco has invested in a 10% stake in HORSE Powertrain. This reflects a strategic shift: a traditional oil power is now actively seeking technologies that bridge the gap between combustion and electrification. HORSE’s fuel-flexible system aligns with this transition, positioning itself as a key technology during the shift from petroleum to synthetic and renewable fuels.
Conclusion: A New Alternative Between EV and Hybrid
While EV adoption is inevitable, not every environment is suited for full electric mobility just yet. In this transitional phase, EREVs present a compelling middle ground between EVs and traditional hybrids—what some are calling “Hybrid 2.0.” Renault and Geely’s HORSE Powertrain, with its innovative slot-in module, offers automakers a powerful new tool and gives consumers an EV experience without the charging anxiety. As the auto industry explores life beyond the EV revolution, EREVs and HORSE’s technology may well be part of the answer.
Comments
Post a Comment