Presenting the Benefits - Off-Highway Engine Test of Prototype Electric Turbocharger | Aeristech

Presenting the Benefits – Off-Highway Engine Test of Prototype Electric Turbocharger

20th October 2012

Following an exciting project with Birmingham City University, installing and testing our system on an Off-Highway engine, Aeristech is delighted to share our recent test data, which confirms our earlier figures and mathematical engine modelling. The Off-Highway Engine Presentation quantifies the attractive benefits of this particular prototype Electric Turbocharger motor, especially when contrasted with a conventional mechanical turbocharger.

Slide five outlines emission regulations, regarding HC and Particulates, which regulate the increase in fuel used when accelerating. As is well known in the industry, traditional mechanical turbochargers change their speed and boost levels passively in response to changes in exhaust volume. To change exhaust volume, the Engine Control Unit needs to inject additional fuel. This leaves the ECU programmer caught between two conflicting targets: to achieve good transient response, he must jeopardize the engine’s smoke limit and particulate emissions; to stay within set emission limits, he must limit the fuel and retard engine performance until the turbocharger has managed to increase speed. Slides twenty and twenty-one demonstrate that although the response time of a mechanical turbo can be improved by forcibly adding more fuel, this results in markedly increased emissions.

In contrast, as demonstrated by slide twenty-three’s data, which compares Aeristech’s Electric turbocharger with a traditional mechanical turbocharger, Aeristech’s FullElectric motor doesn’t concede responsiveness to achieve lowered emissions. This is because Aeristech’s electric turbocharger responds actively, by first accelerating the compressor using stored energy. The compressor pumps air more immediately, so the ECU can inject greater fuel without compromising air/fuel ratio or emissions. When exhaust pressure rises, milliseconds later, the stored energy is recovered and the system is again in balance. This change in speed and boost is accomplished without any change to the air/fuel ratio or emissions during the transient event, allowing quicker acceleration and therefore greatly diminishing turbo lag.

Aeristech is pleased to share this fascinating data and its corroboration of our Off-Highway engine modelling. We look forward to achieving similar notable results on other engine projects.  We welcome proposals from other manufacturers and interested parties.

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