ICEFundamental an der RWTH Aachen

Karteikarten und Zusammenfassungen für ICEFundamental an der RWTH Aachen

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Lerne jetzt mit Karteikarten und Zusammenfassungen für den Kurs ICEFundamental an der RWTH Aachen.

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

You hold a new ceramic monolith up against the light and note that you cannot see
through the channels. Which component for exhaust gas aftertreatment are you holding in
your hands?

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Name three reasons for the lower specific fuel consumption of a diesel engine in
comparison to a non-supercharged gasoline engine

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

What is meant by the term “downsizing“ and why leads the application of this method to a
reduced fuel consumption?

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Briefly explain how the percentage share of engine friction losses changes during
increasing engine load and constant speed regarding total losses.

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Which two operating modes are available when using gasoline direct injection?

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Explain the functionality of the SCR-process. Which pollutant can be reduced by using this
system?

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Describe the carbon monoxide progression over the relative air-fuel ratio λ for gasoline
engines. Explain why it is significantly different at low relative air-fuel ratios than at high
relative air-fuel ratios.

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Name three functions of the ignition system for gasoline engines. Explain the terms "hot"
and "cold" spark plug.

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Explain the term ignition delay in a diesel engine.

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Describe the influence on engine operation of a too high boiling point of the gasoline boiling curve for a vehicle with a modern fuel tank
system (indicate the correlation).

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Describe the influence on engine operation of a too low and too high 10 %-point, as well as a too high 90 %-point of the gasoline boiling curve for a vehicle with a modern fuel tank
system (indicate the correlation).

Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

Which two speed components determine the burning velocity w B ? Explain why the spark timing has to be advanced with increasing engine speed.

Kommilitonen im Kurs ICEFundamental an der RWTH Aachen. erstellen und teilen Zusammenfassungen, Karteikarten, Lernpläne und andere Lernmaterialien mit der intelligenten StudySmarter Lernapp. Jetzt mitmachen!

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Beispielhafte Karteikarten für ICEFundamental an der RWTH Aachen auf StudySmarter:

ICEFundamental

You hold a new ceramic monolith up against the light and note that you cannot see
through the channels. Which component for exhaust gas aftertreatment are you holding in
your hands?

Diesel particle filter (DPF)

ICEFundamental

Name three reasons for the lower specific fuel consumption of a diesel engine in
comparison to a non-supercharged gasoline engine

 Higher Air-Fuel-Ratio and thus high c p /c v ,
 High compression ratios
 Lower pumping losses
 Steeper burn rates

ICEFundamental

What is meant by the term “downsizing“ and why leads the application of this method to a
reduced fuel consumption?

Downsizing: Smaller engine V H with higher specific power output p me.
Reduced fuel consumption by shifted the engine operating points to higher loads and thus
in areas of the engine map with better specific fuel consumption (de-throttling). In addition
the reduced engine displacement (number of cylinders) generally reduces friction losses
compared to larger engines with the same power output (p mr )

ICEFundamental

Briefly explain how the percentage share of engine friction losses changes during
increasing engine load and constant speed regarding total losses.

With increasing load the fraction of the used power output is increased whereas the
friction losses stay nearly constant. As a consequence, the fraction of the friction losses
will decrease

ICEFundamental

Which two operating modes are available when using gasoline direct injection?

Homogeneous
 Stratified

ICEFundamental

Explain the functionality of the SCR-process. Which pollutant can be reduced by using this
system?

SCR (Selective Catalytic Reaction) catalytic converter: Reduction of Nitrogen Oxides in the presence of Ammonia, which needs to be added into the exhaust system depending
on the composition of the exhaust gas

ICEFundamental

Describe the carbon monoxide progression over the relative air-fuel ratio λ for gasoline
engines. Explain why it is significantly different at low relative air-fuel ratios than at high
relative air-fuel ratios.

Carbon monoxide emerges due to incomplete combustion of carbon during oxygen shortage (Rich mixture or λ < 1.0). If enough oxygen is available the combustion continues until the transformation into CO2; at λ > 1.0 the amount of CO declines sharply.

ICEFundamental

Name three functions of the ignition system for gasoline engines. Explain the terms "hot"
and "cold" spark plug.

 Provision of ignition energy
 Ignition timing
 Generation of the needed voltage
> Distribution to the individual cylinders
 Generation of the ignition spark

 „hot“ spark plug: Spark plug with long insulator nose, large heat receptive surface,
minimal thermal load capacity, fast to reach self-cleaning temperature.
 „cold“ spark plug: Spark plug with short insulator nose, small heat receptive
surface, high protection against glow ignition, danger of contamination.

ICEFundamental

Explain the term ignition delay in a diesel engine.

the ignition delay is defined as the time between the start of the injection and
the increase in pressure due to combustion.

ICEFundamental

Describe the influence on engine operation of a too high boiling point of the gasoline boiling curve for a vehicle with a modern fuel tank
system (indicate the correlation).

The high boiling componnents are not properly burned. Lubrication oil dilution and soot formation

ICEFundamental

Describe the influence on engine operation of a too low and too high 10 %-point, as well as a too high 90 %-point of the gasoline boiling curve for a vehicle with a modern fuel tank
system (indicate the correlation).

10 % point too high: Bad cold start
10 % point too low: Vapor lock in the fuel system, Evaporative loss from the tank
50 % too high: poor transient response at cold engine condition
90 % too high: engine oil dilution
residue formation in combustion chamber

ICEFundamental

Which two speed components determine the burning velocity w B ? Explain why the spark timing has to be advanced with increasing engine speed.

w_B = w_BL + w_BT (Laminar burning speed+ Turbulent burning  speed)

Since the flame speed is not linear with the mean piston speed. increases, the combustion time corresponding crank angle range increases with increasing engine speed. So that the peak pressure is reached shortly after TDC, the ignition angle must be increased accordingly with increasing engine speed

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