In implementing electrification, Mercedes-AMG is also benefiting from know-how gained in motorsport. The company's latest achievement, which is already in the final stages of development, is the electric exhaust gas turbocharger, which is to be used as standard equipment in the next generation of Mercedes-AMG vehicles.
Developed in collaboration with Garrett Motion, the exhaust gas turbocharger technology comes directly from Formula 1 and resolves the conflict of objectives between a small, fast-response charger that achieves a comparatively low peak power output and a large charger with a high peak power output that only responds with a delay.
The highlight of the turbocharger technology: an electric motor about four centimeters in size is integrated directly on the charger shaft, i.e. between the turbine wheel on the exhaust gas side and the compressor wheel on the fresh air side. The electronically controlled motor drives the compressor wheel before it takes over the flow of exhaust gas. Electrification of the turbocharger significantly improves the response characteristics directly from idling speed and across the entire speed range. The so-called turbo lag, i.e. the delayed response of a conventional turbocharger, is eliminated by the electric motor.
The result: the combustion engine responds even more spontaneously to accelerator pedal commands. The overall driving experience becomes more dynamic and agile. In addition, the electrification of the turbocharger allows higher torque at low engine speeds. This also increases agility and improves acceleration from a standing start. Even if the driver takes his foot off the gas or brakes, the electric turbocharger is able to maintain boost pressure at all times, ensuring a continuous direct response.
The turbocharger can achieve speeds of up to 170,000 rpm, which allows a very high air flow rate. It can be operated on a 48 V vehicle electrical system. The charger, electric motor and power electronics are connected to the cooling circuit of the combustion engine to always provide the best possible temperature environment.
»We have clearly defined our goals for an electrified future. To achieve them, we are relying on independent and innovative components and power units. In this way, we are strategically supplementing our modular technology and tailoring it to our performance requirements. One of the first steps is the electrified turbocharger - an example of the transfer of Formula 1 technology to the road,« explains Tobias Moers, Chairman of the Board of Management of Mercedes-AMG.