AVL SDIS Mk.II - Low Cost Automotive FI Applied to 2-Stroke Engines for Future CARB - Regulations

The basic Semi-Direct-lnjection System (SDIS) which is already in production for PWC and applied to small 2wheeler engines features a low-pressure fuel injection system injecting through the rear scavenge port window in the cylinder symmetry plane onto the piston crown. The patented new SDIS Mk.II S...

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Bibliographic Details
Published in:SAE transactions 1999-01, Vol.108, p.1286-1321
Main Authors: Laimböck, Franz J., Klasnic, Horst, Grilc, Simon, Meister, Gerhard F., Dorfstätter, Markus J.
Format: Article
Language:English
Online Access:Get full text
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Summary:The basic Semi-Direct-lnjection System (SDIS) which is already in production for PWC and applied to small 2wheeler engines features a low-pressure fuel injection system injecting through the rear scavenge port window in the cylinder symmetry plane onto the piston crown. The patented new SDIS Mk.II System [1] injects through an (additional) scavenge port window that is positioned above the scavenge ports and is controlled by a window in the piston skirt. This new arrangement allows longer injection duration and also other injector positions and directions. A CFD simulation by AVL's FIRE-CFD-code with moving piston and exhaust gas dynamics compares the different injector positions and directions for WOT and rated speed and for a part throttle low speed case. The SDIS Mk.II injection system consists of mass-produced automotive parts thus giving a low cost approach for present 2-stroke engines requiring only moderate engine modifications.
ISSN:0096-736X
2577-1531