Fig. 7 shows CO2emission proportion method for
estimate CD ratio. How to obtain CD Ratio: KCDduring
Transition Cycle. CD ratio during transition cycle is
obtained by calculating transition cycle of CO2emission
proportion during CD run and CS run. During the
transition cycle, before changing point CD operation to
CS operation which period emitted CO2concentration is
same as CD cycle just before transition cycle and after
changing point of CD to CS which emitted CO2as same
as CS cycle. Hall amount of CO2mass during transition
cycle is able to measure. We can calculate the CO2
fraction from CD operation by using CO2amount emitted
from all CD and CS mode operation. It shall be taken
into consideration that the CO2emitted from the first
start of ICE does not affect to kCDcalculation.