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Low Temperature, Mixing-Controlled Combustion With Pressure Modulated Multi-Injection for HSDI Diesel Engine (First Report)~Low NOx Combustion Concept Capable of High Load Operation
Published October 07, 2009 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
Low temperature, mixing-controlled DI diesel combustion with LP (low pressure) close-pilot injection followed by HP (high pressure) main injection was examined using single-cylinder HSDI diesel engine and 3D-CFD. The pressure modulated multi-injection was realized by hydraulic intensified fuel injector. The experimental results showed that, even at high EGR and high load conditions, soot and maximum pressure-rise rate can be reduced below 0.1 g/kWih and 0.5 MPa/°CA respectively by controlling swirl, dwell time of the multi-injection (LP pilot and HP main), and main injection velocity. Furthermore, the 3D-CFD analysis clarified that HP main spray is injected toward local high temperature region of burning pilot spray, leading to broadband distribution of equivalence ratio transiently at the beginning of combustion and then rapid homogenization of the mixture with progress in combustion.