One engine for every era: Porsche wants to keep combustion alive the hard way

© A. Krivonosov

Porsche is looking for a way to avoid betting everything on a single type of powertrain. A new patent from the brand describes a system that could theoretically operate as an electric car, as a hybrid and as an EREV with a petrol generator topping up the battery.

The idea goes deeper than a normal plug-in hybrid. In the patent, the engine is split into two distinct cylinder banks: one tuned for efficiency, the other for power. In relaxed driving the car can run purely on electric drive. When the battery runs low, the efficient bank of the combustion engine kicks in and works as a generator. If the driver demands maximum performance, the system engages the whole package, including the higher-output bank. This isn’t the usual cylinder deactivation, where the electronics simply shut down part of the engine for a while.

Porsche is describing physically different sections of the engine. The efficiency-focused bank gets friction-reducing solutions, including ceramic bearings and fewer piston rings. The approach offers flexibility, but immediately makes the unit expensive and technically demanding.

Porsche’s logic is clear. Electrification is moving unevenly: the Taycan has already shown that even a flagship EV status doesn’t guarantee a smooth life for a model, the electric 718 is delayed, and Porsche is in no hurry to turn the 911 into a pure EV. At the same time emissions rules keep tightening and markets move at different speeds.

A universal architecture would give the brand more room to manoeuvre. In town the car would drive like an EV, on long trips it would lean on the engine as a safety net for range, and in sport mode it would keep the direct link between the combustion engine and acceleration. For Porsche this matters more than usual: the brand sells not just spec-sheet seconds but the feel of the mechanics.

The main problem is mass. To get a useful electric range, you need a battery. On top of that come the combustion engine, electric motors, power electronics, cooling and a complex transmission. For a large mainstream SUV all of that can be hidden in size and price, but for a Porsche the extra kilos hurt handling — the very quality buyers happily pay extra for.

On the market this layout overlaps with the plug-in hybrids from BMW and Mercedes, as well as with Chinese EREV models, where the combustion engine often works only as a generator. The difference is that Porsche, judging by the patent, wants to leave the petrol engine not just the role of a charging station, but also a part in the driving experience.

For now this is a patent, not an announcement of a production model. But the document itself captures the mood of the industry well: manufacturers are no longer sure that a single battery bet will cover every country, every habit and every use case. Porsche has always loved complicated engineering answers. The question now is whether the most universal engine won’t also turn out to be the heaviest compromise.