Exam (elaborations)
HCCI and PPC exam with 100- correct answers 2024
PPC Characteristics of Nissan Modulated Kinetics
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HCCI and PPC exam with 100% correctanswers 2024
PPC - ANSWER-Partially premixed ignition
benefits of HCCI - ANSWER-high efficiency and ultra low NOx
drawbacks of HCCI - ANSWER-Combustion control and Power density
benefits of PPC HCCI - ANSWER-Injection controlled, less emissions advantage
HCCI is normally a set-up with - ANSWER-port fuel injection and high compression
ratio.
PCCI is normally a set-up with - ANSWER-early direct injection forming a rather
homogeneous charge
PPC, partially premixed combustion is a bit less homogeneous than PCCI i.e. -
ANSWER-later injection
LTC is any combustion process giving - ANSWER-low NOx due to low temperature
combustion.
characteristics of PPC - ANSWER-Increased premixing through longer ignition delay,
High amounts cooled EGR are used and Very low NOx and smoke levels
Two subgroups of PPC - ANSWER-With late and early injection
Characteristics of Nissan Modulated Kinetics - ANSWER-Fast mixing due to high swirl
ratio + slow chemistry due to high EGR > yields a more homogeneous charge
Comparison with conventional diesel - ANSWER-Luminous yellow flame in conventional
mode (sootradiation), Almost blue flame in MK mode (more premixed)
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