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TESTE DEIN WISSEN
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).
Lösung anzeigen
TESTE DEIN WISSEN
The high boiling componnents are not properly burned. Lubrication oil dilution and soot formation
Lösung ausblenden
TESTE DEIN WISSEN
Briefly explain how the percentage share of engine friction losses changes during
increasing engine load and constant speed regarding total losses.
Lösung anzeigen
TESTE DEIN WISSEN
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
Lösung ausblenden
TESTE DEIN WISSEN
Why is it possible to use a higher compression ratio for gasoline engines with inner
mixture formation in comparison to engines with external mixture formation?
Lösung anzeigen
TESTE DEIN WISSEN
Due to the evaporation of the fuel in the combustion chamber, the surrounding heat is removed from the heat of vaporization, resulting in greater internal cooling.
Lösung ausblenden
TESTE DEIN WISSEN
Explain the functionality of the SCR-process. Which pollutant can be reduced by using this
system?
Lösung anzeigen
TESTE DEIN WISSEN
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
Lösung ausblenden
TESTE DEIN WISSEN
Which configurations and measures have to be kept constant during the recording of a so called „fish hook curve“
Lösung anzeigen
TESTE DEIN WISSEN
Throttle opening position
Engine speed
Lösung ausblenden
TESTE DEIN WISSEN
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).
Lösung anzeigen
TESTE DEIN WISSEN
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
Lösung ausblenden
TESTE DEIN WISSEN
Explain the term ignition delay in a diesel engine.
Lösung anzeigen
TESTE DEIN WISSEN
the ignition delay is defined as the time between the start of the injection and
the increase in pressure due to combustion.
Lösung ausblenden
TESTE DEIN WISSEN
Name three functions of the ignition system for gasoline engines. Explain the terms "hot"
and "cold" spark plug.
Lösung anzeigen
TESTE DEIN WISSEN
 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.
Lösung ausblenden
TESTE DEIN WISSEN
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.
Lösung anzeigen
TESTE DEIN WISSEN
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.
Lösung ausblenden
TESTE DEIN WISSEN
Which two operating modes are available when using gasoline direct injection?
Lösung anzeigen
TESTE DEIN WISSEN
Homogeneous
 Stratified
Lösung ausblenden
TESTE DEIN WISSEN
What is meant by the term “downsizing“ and why leads the application of this method to a
reduced fuel consumption?
Lösung anzeigen
TESTE DEIN WISSEN
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 )
Lösung ausblenden
TESTE DEIN WISSEN
Name three reasons for the lower specific fuel consumption of a diesel engine in
comparison to a non-supercharged gasoline engine
Lösung anzeigen
TESTE DEIN WISSEN
 Higher Air-Fuel-Ratio and thus high c p /c v ,
 High compression ratios
 Lower pumping losses
 Steeper burn rates
Lösung ausblenden
  • 174935 Karteikarten
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Beispielhafte Karteikarten für deinen ICEFundamental Kurs an der RWTH Aachen - von Kommilitonen auf StudySmarter erstellt!

Q:
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).
A:
The high boiling componnents are not properly burned. Lubrication oil dilution and soot formation
Q:
Briefly explain how the percentage share of engine friction losses changes during
increasing engine load and constant speed regarding total losses.
A:
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
Q:
Why is it possible to use a higher compression ratio for gasoline engines with inner
mixture formation in comparison to engines with external mixture formation?
A:
Due to the evaporation of the fuel in the combustion chamber, the surrounding heat is removed from the heat of vaporization, resulting in greater internal cooling.
Q:
Explain the functionality of the SCR-process. Which pollutant can be reduced by using this
system?
A:
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
Q:
Which configurations and measures have to be kept constant during the recording of a so called „fish hook curve“
A:
Throttle opening position
Engine speed
Mehr Karteikarten anzeigen
Q:
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).
A:
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
Q:
Explain the term ignition delay in a diesel engine.
A:
the ignition delay is defined as the time between the start of the injection and
the increase in pressure due to combustion.
Q:
Name three functions of the ignition system for gasoline engines. Explain the terms "hot"
and "cold" spark plug.
A:
 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.
Q:
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.
A:
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.
Q:
Which two operating modes are available when using gasoline direct injection?
A:
Homogeneous
 Stratified
Q:
What is meant by the term “downsizing“ and why leads the application of this method to a
reduced fuel consumption?
A:
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 )
Q:
Name three reasons for the lower specific fuel consumption of a diesel engine in
comparison to a non-supercharged gasoline engine
A:
 Higher Air-Fuel-Ratio and thus high c p /c v ,
 High compression ratios
 Lower pumping losses
 Steeper burn rates
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