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.
System Design for a Direct-Boost Turbocharged SI Engine Using a Camshaft Driven Valve
Lect. Notes Electrical Eng.
07.11.2012
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
System Design for a Direct-Boost Turbocharged SI Engine Using a Camshaft Driven Valve F2012-B01-024
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