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HCCI and PPC exam with 100- correct answers 2024

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PPC Characteristics of Nissan Modulated Kinetics

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HCCI and PPC exam with 100% correct
answers 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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