Investigating Effects of Direct Injection During NVO on HCCI Combustion. Effects of PreDI %. Students: John Waldman, Dennis Nitz Advisor:Prof. David E. Foster Visiting Researchers: Takeru Ibara, Minoru Iida Funding by:Yamaha Motor Company. Definitions.
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Investigating Effects of Direct Injection During NVO on HCCI Combustion
Effects of PreDI %
Students: John Waldman, Dennis Nitz
Advisor:Prof. David E. Foster
Visiting Researchers: Takeru Ibara, Minoru Iida
Funding by:Yamaha Motor Company
Single Cylinder Yamaha Research Engine
Effects of PreDI% on HCCI combustion. Note: the combustion timing is advanced with higher percentages of PreDI. Also NOx emissions are more sensitive to changes in PreDI % at leaner AFR.
Effects of PreDI Timing
PI Duration (usec)
PI Duration (usec)
Baseline Operating Range
Effects of PreDI timing with different amounts of PI fuel. Note: the timing is retarded as PreDI timing is retarded. Also, THC emissions reach a minimum value around 430 CAD bfTDC.
1. Timing of HCCI combustion
2. Emissions produced from HCCI combustion
influence the timing of HCCI combustion and emissions
Port Injection vs. Direct Injection.
Valve Timings and Details
Operating range obtained with current valve timings for both Port Injection and Direct Injection with PreDI. This map was obtained with fixed valve timing, fixed injection timing, fixed PreDI duration and the load varied by reducing the PI or DI duration.
Port Injection vs. Direct injection Combustion Efficiency. Note the different trends from PI to DI.