Porsche is exploring a new way to make range-extended electric vehicles quieter by using their electric motors to counteract engine noise and vibrations. A newly surfaced patent outlines a system that could pair a two-cylinder boxer engine with an electric motor, potentially improving cabin comfort without adding extensive soundproofing.
How Porsche’s Range-Extended EV Technology Works
Range-extended electric vehicles occupy a middle ground between traditional hybrids and fully electric cars. They use electric motors to drive the vehicle, while a gasoline engine operates as a generator to recharge the battery when needed.
This setup allows drivers to travel using electric power without relying entirely on charging stations. However, keeping a combustion engine onboard introduces familiar challenges, including noise and vibrations that can reach the cabin even when the engine is not mechanically connected to the wheels.
Porsche’s proposed system takes a different approach to addressing those issues. Instead of relying primarily on additional insulation or specialized engine mounts, the company wants to use the electric motor itself to help cancel unwanted noise and vibrations.
Electric Motor Could Act as a Noise-Cancellation System
The technology works similarly to noise-canceling headphones, using signals from sensors to generate counteracting movements that reduce unwanted sound and vibration.
The proposed system includes a sound sensor inside the cabin and a movement sensor near the engine. Both provide information to a control unit, which determines how the electric motor should respond to counteract the engine’s disturbances.
Porsche also proposes supplying the system with stored information about engine RPM and other operating conditions, allowing it to anticipate how the engine will behave and adjust its response accordingly.
The patent also describes the potential use of a shaker or speaker to further reduce noise and vibrations if necessary.
Unlike conventional noise-cancellation systems that rely on separate equipment, Porsche’s approach would allow the electric motor to serve two purposes: powering the vehicle and helping reduce unwanted engine noise.
Could the Technology Make Future Porsche EVs Quieter?
One potential application is a range-extended electric vehicle in which the combustion engine powers a generator rather than mechanically driving the wheels.
Because the engine could operate at a relatively consistent speed, its noise characteristics may be easier for the system to predict and counteract. That could help reduce the persistent engine drone during longer trips when the gasoline engine runs to supply power to the battery.
The proposed system could also improve cabin refinement without requiring additional soundproofing materials or complicated hardware. Using the electric motor for noise cancellation could help simplify the overall setup.
Porsche Has Not Confirmed Production Plans
For now, Porsche has not announced a production vehicle featuring the technology. The patent does not confirm whether the company plans to introduce the proposed system in a future model or is simply investigating its engineering potential.
As with other patent applications, publication does not guarantee that the technology will reach production. The system remains a proposed solution, with no confirmed timeline or vehicle application.
