MG’s research and development chief, Qiu Jie, has revealed a key reason why range-extender hybrids aren’t gaining traction in Europe: they struggle to meet upcoming Euro 7 emissions standards. This might seem counterintuitive, given that these vehicles combine electric driving with a backup gasoline engine, but the testing procedures expose a critical weakness.
How Range Extenders Differ from Traditional Hybrids
Range-extender hybrids are designed to function primarily as electric vehicles, utilizing a large battery (typically 40-80 kWh) for most journeys. When the battery depletes, a small internal combustion engine (ICE) kicks in not to directly power the wheels, but to generate electricity for the battery. This differs significantly from conventional plug-in hybrids (PHEVs).
The Euro 7 Emissions Challenge
The Euro 7 regulations are designed to tighten emissions controls, and the testing process exposes a vulnerability in range-extender designs. Specifically, when the battery is low, the gasoline engine must work harder to generate enough electricity to meet demand. This high-stress operating phase leads to increased emissions, making it difficult for range extenders to pass the stringent tests.
Cost and Complexity
A key factor is cost: range-extenders often skimp on advanced emissions-control technology to offset the expense of a large battery and two separate powertrains. PHEVs, meanwhile, generally feature more robust systems because their gasoline engines are more actively integrated into the vehicle’s operation.
Why PHEVs Pass When Range Extenders Fail
PHEVs typically have a more direct connection between the engine and the wheels, allowing for better efficiency in gasoline mode. This also means they’re equipped with more comprehensive emissions controls. In essence, a PHEV can function more like a heavier full-hybrid car when running on gasoline alone.
In short, Euro 7 testing isn’t about how often a range extender runs on gasoline, but about ensuring it can meet emissions standards even in the most demanding conditions.
This regulatory hurdle effectively limits the viability of range-extender hybrids in Europe, as manufacturers struggle to meet the increasingly strict emissions requirements without significant cost increases.
