HCCI and PPC Exam Questions With
Correct Answers.
PPC - answerPartially premixed ignition
benefits of HCCI - answerhigh efficiency and ultra low NOx
drawbacks of HCCI - answerCombustion control and Power density
benefits of PPC HCCI - answerInjection controlled, less emissions advantage
HCCI ...
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)
load limit for Nissan MK - answer✔✔Fuel injection should be finished before autoignition,
positive ignition dwell
in Nissan MK, there is an Extended ignition delay through - answer✔✔large amounts of cooled
EGR
shorter injection through - answer✔✔Higher injection pressure-Injector with high flow number
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