Mercedes-AMG develops electric exhaust gas turbocharger

Mercedes-AMG is in the final stages of developing an electric exhaust gas turbocharger, which the company says will be used in an upcoming series production model.

Developed in partnership with Garrett Motion, the technology comes straight from Formula 1 and the company says it resolves the conflicting goals between a small, fast-reacting turbocharger which achieves relatively low peak performance and a large turbocharger with a high peak performance but which can suffer from turbo lag.

The new turbocharging system includes a slim electric motor, measuring about 4cm, which is integrated directly on the charger shaft between the turbine wheel on the exhaust side and the compressor wheel on the fresh air side.

This electronically controlled electric motor the compressor wheel before it accepts the exhaust gas flow.

Mercedes-AMG says the electrification of the turbocharger significantly improves immediate response from idle speed and across the entire engine speed range, with turbo lag eliminated by the electric motor.

In addition, the company says electrification of the turbocharger enables higher torque at low engine speeds, enhancing agility and optimising acceleration capability from a standstill.

The turbocharger achieves speeds of up to 170,000 rpm, which enables a very high rate of air flow. It can be operated via a 48-volt on-board electrical system. The turbocharger, electric motor and power electronics are connected to the combustion engine’s cooling circuit to create an optimum temperature environment at all times.

Source: Motor Trader E-magazine (July 2020)

9 Jul 2020

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