Xin Q. Diesel Engine System Design

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640 Diesel engine system design

fuel consumption at light loads. Note that the primary objective of diesel

HCCI is to reduce NO

and soot emissions to eliminate NO

aftertreatment,

while the primary goal of gasoline CAI is to reduce fuel consumption.

The synergy between CAI and cylinder deactivation (with conventional

spark ignition combustion in the ring cylinders) for an I4 gasoline engine

was researched by Douglas et al. (2005). In their cylinder deactivation,

the fueling was shut off for two cylinders, the fresh air was blocked at the

intake manifold, and the engine intake and exhaust valves were operated

with low-lift cam proles to pump the hot exhaust gases. The CAI was

operated in the low to medium load region, while the cylinder deactivation

was operated to cover the even lower load region. They concluded that CAI

and cylinder deactivation were complementary for the gasoline engine so

that they could signicantly improve the fuel consumption over a broadened

area on the engine map. In their study, for the city driving or light-duty

applications, a majority of the time (75%) in the driving cycle was spent

in the low load and idle region where CAI and cylinder deactivation were

used to reduce fuel consumption by 10.2% and reduce NO

emissions by

28%. They predicted 4.9% reduction in fuel consumption (i.e., from 33 mpg

to 34.7 mpg) during the New European Driving Cycle (NEDC) for a 1.6

liter gasoline engine in a light-duty vehicle when CAI was used. They also

predicted 10.2% reduction in fuel consumption (i.e., from 33 mpg to 36.7

mpg) when both CAI and cylinder deactivation were used. It is expected that

HCCI and cylinder deactivation can also be complementary for the diesel

engine in order to maximize the fuel economy improvement in a broadened

load range on the engine map from the very low load to the medium load.

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641Advanced diesel valvetrain system design

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642 Diesel engine system design

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643Advanced diesel valvetrain system design

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644 Diesel engine system design

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647Advanced diesel valvetrain system design

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