ICEFundamental at RWTH Aachen

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Exemplary flashcards for ICEFundamental at the RWTH Aachen on StudySmarter:

Which configurations and measures have to be kept constant during the recording of a so called „fish hook curve“

Exemplary flashcards for ICEFundamental at the RWTH Aachen on StudySmarter:

Three main advantages of common rail system compared to the injection synchronised pressure generation?    

Exemplary flashcards for ICEFundamental at the RWTH Aachen on StudySmarter:

4 Otto cycle measures to reduce pollution?
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Exemplary flashcards for ICEFundamental at the RWTH Aachen on StudySmarter:

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?

Exemplary flashcards for ICEFundamental at the RWTH Aachen on StudySmarter:

Name four measures to internally reduce particulate matter emissions in Diesel engines.

Exemplary flashcards for ICEFundamental at the RWTH Aachen on StudySmarter:

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

Exemplary flashcards for ICEFundamental at the RWTH Aachen on 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).
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Exemplary flashcards for ICEFundamental at the RWTH Aachen on 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).

Exemplary flashcards for ICEFundamental at the RWTH Aachen on StudySmarter:

Explain the term ignition delay in a diesel engine.

Exemplary flashcards for ICEFundamental at the RWTH Aachen on StudySmarter:

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

Exemplary flashcards for ICEFundamental at the RWTH Aachen on 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.
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Explain the functionality of the SCR-process. Which pollutant can be reduced by using this
system?

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Exemplary flashcards for ICEFundamental at the RWTH Aachen on StudySmarter:

ICEFundamental

Which configurations and measures have to be kept constant during the recording of a so called „fish hook curve“
Throttle opening position
Engine speed

ICEFundamental

Three main advantages of common rail system compared to the injection synchronised pressure generation?    
1. Allows injection pressure, duration, and timing to be varied in a wide range, nearly independent of the operating point
2. The injection process is controlled by the solenoid valve controlled injectors. This results in the ability to vary the number of injections in an operating cycle, eg. pre or post injections.
3. The system in the high pressure reservoir is regulated depending on the operating point, using a control device. The fuel pump can operate independently of the engine speed. Thus, high pressures can also be reached at a low engine speed.

ICEFundamental

4 Otto cycle measures to reduce pollution?
> Mixture composition lambda (up to lean operation)
> Exhaust gas circulation
> Shape of combustion chamber
> Ignition(timing, system)

ICEFundamental

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?
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.

ICEFundamental

Name four measures to internally reduce particulate matter emissions in Diesel engines.
> Adjustment of the injection time point after early,
> increase of the injection pressure,
> multiple injection,
> adjustment of the spray pattern,
> increase of the twist (charge movement),
> reduction of the compression ratio, charge

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

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

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

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

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

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

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

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