Chapter 31
EGR technologies have created a condition of increase fuel consumption by as much as
10%
The optimum percentage of O2 in the exhaust gas flow is between
14- 16%
Maximum air pressure charged to an EGR cooler for leak detection is
20 psi
Which year was EGR technology to Diesel engines.
2002
Combustion temperature above ___ create NOx
2500 degrees
EGR flow is often prevented when ambient temperatures fall below
40 degrees
EGR operating strategies often prevent EGR gas flow in cold ambient temperature below
40 degrees
With reference to skill drill 31-2 how much voltage is applied to the volt reference wire?
5 volts
Approximately what percentage of NOx emissions are generated by transportation?
50%
A three wire pressure sensor is considered
Active
Cylinder temperature reduction created with EGR flow has a direct effect on
All of the above
EGR flow to the engine may not exist or be at a minimum during such engine operating conditions as
All of the above
To maintain engine torque output with the lower cylinder combustion pressure due to EGR, engine manufacturer made adjustments to
All of the above
High levels of EGR flow rates to the combustion process create
An increase in HC
Nitrogen dioxide is visible as
Brownish in color
Which component is not a component of CEGR system?
CAC
Which diesel emission has the highest specific heat characteristics?
CO2
Nitric oxide is
Colorless
Which internal engine is component is changed to increase the stroke of the engine to compensate for power losses related to EGR use?
Crankshaft
Oxygen content in the exhaust flow is increased when EGR flow
Decrease
Introducing EGR flow with compressed intake air
Decrease combustion speed
Which engine manufacturer adopted the use of an asymmetrical turbocharger?
Detroit Diesel
Which engine manufacturer has not incorporated a VGT within their emission strategy?
Detroit Diesel
The EGR valve is controlled by
ECM
The common causes of engine operational issues reported is the ____ system
EGR
The primary input related to how much EGR mass is required is the accelerator pedal position and
Engine speed
The function of the EGR mixer is to blend
Exhaust gas with charge air
Which sensor measures EGR flow rates?
HOS
Restriction across the pressure differential sensor increases as EGR flow
Increase
Which component is not utilized within an HP-CEGR system?
Intake mixer
Internal EGR strategies have included a brief opening of the exhaust valve during the
Intake stroke
C-15 Caterpillar uses which type of NOx reduction strategy?
LP-EGR
When testing an EGR valve what happens to the boost pressure when the EGR valve is enable?
Lower boost pressure
EGR is an cylinder emissions reduction strategy used to prevent the formation of
NOx
Liquid SCR systems have been adopted to control
NOx
Thermal expansion of EGR coolers require the huddle tubes to be
O-ring mounted
Oil sample results to a failed EGR cooler will report excessive ____ within the engine oil.
Sodium
EGR coolers are constructed of
Stainless steel
Which component restricts exhaust gas flow within the low pressure EGR system utilizes by Detroit Diesel?
Turbochargers
The MAF sensor can detect
Weight, pressure, and restrictions
