Abstract
Downsizing and turbocharging for retaining the maximal power is a common approach to improve the fuel economy of SI internal combustion engines. Due to the additional turbocharger dynamics, small engines suffer from a significant time lag of the torque build-up. The injection of pressurized air into the combustion chamber during the compression phase, also called direct-boost, can recover the driveability. Thus far, expensive and complex fully variable valve-trains have been proposed for the air exchange between the air tank and the combustion chamber. In this paper, a direct-boost system using a camshaft driven valve is designed. An appropriate control strategy is presented. The transient performance of the complete system and the feasibility of the control strategy are demonstrated on a modified 0.75 l turbocharged two-cylinder test bench engine.
F2012-B01-024
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References
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Voser, C., Onder, C., Guzzella, L. (2013). System Design for a Direct-Boost Turbocharged SI Engine Using a Camshaft Driven Valve. In: Proceedings of the FISITA 2012 World Automotive Congress. Lecture Notes in Electrical Engineering, vol 191. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-33777-2_10
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DOI: https://doi.org/10.1007/978-3-642-33777-2_10
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