Supercharging within the Engine System

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The latest forecasts suggest that by 2020 around half of all passenger car combustion engines could be supercharged. Even so, the overall drive design in each of these vehicles will impose increasing demands on the supercharging set-up. Introducing RDE, for example, as well as more stringent exhaust emission standards mean that in more and more cases scavenging will have to be eliminated. Supercharging technologies that support a spontaneous increase in boost pressure and which can be used even at low speeds and at the corresponding low level of exhaust gas enthalpy can help maintain a rapid engine response. One cost-effective solution may be installing a turbocharger featuring variable turbine geometry alongside Miller timings. Ball bearings or electric supercharging (see left) are also hot talking points. Dr. Hermann Breitbach, Vice President Global Engineering and Innovation at BorgWarner Turbo Systems, sees RDE posing even more challenges, as our interview reveals: Given that enrichment is going to become tricky or even impossible at high loads, exhaust gas temperatures will rise to 1050 °C, which will directly impact on the turbocharger and the material selected for its compressor wheel. …