1 3 F O C U S with the Euro 6c regulations. I.e. the vehicle was designed in such a way that it will also comply with the latest RDE limits. Two Honeywell turbochargers with two-stage compressor in bi-turbo arrangement ensure that the necessary boost pressure and mass flow is achieved without causing excessive temperatures at the compressor outlet. In addition, the two-stage compressor delivers a very broad compressor map while maintaining good efficiency. The onestage turbine ensures low backpressures and thus a low residual gas level in the cylinder. This, in turn, reduces the tendency for knocking. Furthermore, a Honeywell 48-volt e-supercharger supports the turbochargers, ensuring a fast response time at low and high engine speeds. “Two-stage compression is far more efficient because it brings the process closer to isothermal compression. This saves a lot of work in the compression process and results in compression ratios higher than four at moderate compressor outlet temperatures,” Paul Kapus explained. Expressing his thanks for the successful collaboration, he added: “The AVL HyPer 200 project was supported by Fiat Chrysler Automobiles, Honeywell, Bosch, Valeo and Nemak. AVL would like to take this opportunity to say ‘thank you’ for the good collaboration. Special thanks also go to Dirk Andriesse, former Chief Enigneer, as well as Stefano Quinto, Chief Engineer, and Sabino Luisi, Assistant to Chief Engineer, from Fiat Chrysler Automobiles, who made this collaboration possible in the past few years.” What started with the 330-hp Giulietta, which AVL and Fiat/Alfa Romeo presented at the Vienna Motor Symposium in 2013 and was known for having the highest specific output ever to be achieved by a four-cylinder engine and later on evolved into the Volvo S60 with 450 hp, has become a real story of success. The AVL HyPer 200 kW/l is proof that the upper limit for specific output in series engines has still not been reached. With a vehicle weight of around 1000 kilograms and an engine output of 474 hp, AVL has come up with a convincing overall package that has the potential of becoming a trendsetter. Paul Kapus on the significance of the project: “Having gained so much experience with peak-power concepts, we were able to show that within the context of a modular family concept with an electrically supported charging system it is indeed possible to meet the demand for more peak power in downsized engines.” < > High-performance engine with bi-turbocharger and twostage compressor.
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