OPTIMIZATION OF SCAVENGING AND COMBUSTION WITHIN ADVANCED INTERNAL COMBUSTION ENGINES WITH CONCENTRIC CAM SYSTEMS USING COMBINED 1D/3D SIMULATION

摘要

The internal combustion engines for future automotive propulsion, with a highrnspecific torque in a wide speed range, have to accomplish drastic norms regarding CO2rnemissions – thus fuel consumption – and pollutant emission. A compact basic directrninjection engine with joinable super- and turbocharging is for both SI and CI enginesrnfamilies the most promising solution. The effectiveness of such configuration is mainlyrndetermined by the management of scavenging – with the target of the optimum ratiornbetween fresh air and burned gas within the cylinder in the whole load and speed range.rnThe paper presents the potential of a new concept of valve control by concentricrncams, in base on 1D/3D simulation of the scavenging, internal mixture formation by directrninjection, combustion and formation of exhaust gas components. The models arerncalibrated by experimental analysis on engine test benches.rnThe influence of the intake and exhaust valve control in terms of phasing, valve liftrnand opening duration on engine performance is illustrated for different load/speedrncombinations.