Since the first turbocharger developments in the 1890s, performance has been limited by the mechanical linkage between compressor and turbine which causes both to operate at the same rotation speed. By replacing the coupling with a motor and generator, the turbine and compressor are free to operate at different speeds, enabling the compressor speed to be optimised for surge while the turbine speed is optimised for efficiency.
An electric turbocharger reduces the amount of pipework under the bonnet, has fewer losses and costs less than a multi-stage turbocharger solution. Decoupling also allows the turbine to recover and store energy from the exhaust at times when a conventional turbocharger would spill it to waste.
In working with Volkswagen at the Technische Universität Berlin, Aeristech was able to test its own design of motor-compressor with turbine-generator in their hot gas and engine bed test cells. The tests demonstrated a high-boost, variable speed, rapid response, full electric turbocharger with energy storage and no external source of power. FETT was able to achieve high efficiency in several test points, even without bespoke compressors. To date, Aeristech has several ongoing FETT projects.
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