02017nab a2200229 4500 20260520003108.0 260224s2015 xxu ing Inglés Design Methodology of Camshaft Driven Charge Valves for Pneumatic Engine Starts ene./feb. 2015 15/09/2015 ; 15/09/2015 15 p. ; 179-194 Transcripción del resumen del autor: Idling losses constitute a significant amount of the fuel consumption of internal combustion engines. Therefore, shutting down the engine during idling phases can improve its overall efficiency. For driver acceptance a fast restart of the engine must be guaranteed. A fast engine start can be performed using a powerful electric starter and an appropriate battery which are found in hybrid electric vehicles, for example. However, these devices involve additional cost and weight. An alternative method is to use a tank with pressurized air that can be injected directly into the cylinders to start the engine pneumatically. In this paper, pneumatic engine starts using camshaft driven charge valves are discussed. A general methodology for an air-optimal charge valve design is presented which can deal with various requirements. The proposed design methodology is based on a process model representing pneumatic engine operation. A design example for a two-cylinder engine is shown, and the resulting optimized pneumatic start is experimentally verified on a test bench engine. The engine’s idling speed of 1200 rpm can be reached within 350 ms for an initial pressure in the air tank of 10 bar. A detailed system analysis highlights the characteristics of the optimal design found. 1 Oil and Gas Science and Technology 70 ARTICULO Moser, Michael M. 54878 Voser, Christoph 54879 Onder, Christopher H. 54880 Guzzella, Lino 54881 189204 189204 0 0 0 0 257023 BAAB BAAB 2026-03-06 200061436 0 200061436 2026-03-06 00:19:25 2026-03-06 ARTICULO