Manov goes back to school Homework N° 1

[manovlov]

Hy Buddies !
Here's my first homework. Done without lesson's support. I joint only subjects and questions. It' surely will make laugh numbers of you...

Dedicated to Robert ...

Enjoy !
Manov




By what type of motorization can a car be propelled? (1 point)
2. What are the advantages and disadvantages of the internal combustion engine? (1 point)
3. What are the advantages and disadvantages of the electric motor? (1 point)
4. What is the difference in operation between a gasoline engine and a diesel engine? (1 point)
5. Name the 4 strokes of a 4-stroke engine cycle (2 points)
6. How do two opposite poles of two different magnets behave? (1 point)
7. What are the components of an electric motor? (2 points)
8. What types/combinations of hybridization are possible? (2 points)

The four-stroke engine
1. What are the characteristic functions of the engine/cylinder block? (2 points)
2. What is the main advantage of using a removable/retractable sleeve? (1 point)
3. Name the main possible cylinder arrangements. (2 points)
4. What are the functions of the cylinder head?
5. Where is the combustion chamber located? (1 point)
6. What are the functions of the piston? (2 points)
7. What is the role of the connecting rod? (1 point)
8. Complete the following diagram (2 points)

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9. What is the shape of the connecting rod body? (1 point)
10. What methods are used to manufacture the connecting rod cap? (2 points)
11. What means are used to reduce friction between the connecting rod and the crankshaft? (2 points) 12. What are the roles of the crankshaft? (2 points)
13. What is the role of the camshaft? (2 points)
14. What are the methods used for valve timing? (2 points) 15. What is the important point with the timing system? (1 point)
16. Complete the diagram below. (3 points)

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[manovlov]

Hy Buddies,
a little question : low and high pressure fuel pump. In my lesson, i've got this picture to show the difference between these 2 fuel pumps; But, to me, there are the same. Does someone could tell me if i'm wrong or right ? And could have more information ?

On the picture, i don't really see the difference...

Thanks.

Manov

[matthew1]

Hello manovlov!

Can you put that text of Part II and Part III through a French -> English translation? https://translate.google.com/

[manovlov]

Salut Matt !

Here you are.

II. The fuel pump
Usually located in the tank, the fuel pump delivers fuel to the
fuel to the injectors. It is considered as low pressure, its output pressure is between 0.5 and 5 bars.
It consists of a DC motor, a pump and a safety valve (set at~7bars).
It is preceded (or followed) by the fuel filter which prevents any impurity in the circuit that could damage it and the rest of the elements of the injection system, in particular the injectors with their fine orifices. It also ensures the decantation of water in the fuel.

III. The high pressure pump
In the case of direct injection, the fuel is injected under high pressure, from 150 bars for gasoline engines to over 2000 bars for diesel engines.
It can be single or multi-piston. The pistons are actuated via a cam and compress the fuel.
The high-pressure pump is generally driven by the distribution system. Depending on the technology used, it is imperative to respect the timing of the latter by following the manufacturer's method.
It is equipped with a pressure regulator at the outlet to avoid any overpressure.
The pressurized fuel is either sent directly to the injectors (distributor pump + calibrated mechanical injectors) or to a common rail in which the pressure is accumulated for all the injectors (electrically controlled injectors).

[matthew1]

Thanks!

Here are the differences I see:

diff.png (423.95 KiB) Viewed 385 times

[manovlov]

Does it mean that the LOW and HIGH pressure fuel pump are the same if we put them in parts ?

[volvolugnut]

It appears to me the low pressure and high pressure fuel pump drawings are intended to be representative diagrams only. The actual differences will be in the details:
Low pressure pump will have good suction characteristics to pull fuel from the tank. It will also be designed for medium outlet pressure.
The high pressure fuel pump will not need good suction characteristics because the low pressure pump will force fuel into the high pressure pump. It will be designed for high outlet pressure.
All pump designs are a compromise between suction characteristics and outlet pressure capability.
volvolugnut

[manovlov]

Salut Matt !

Here you are.

II. The fuel pump
Usually located in the tank, the fuel pump delivers fuel to the
fuel to the injectors. It is considered as low pressure, its output pressure is between 0.5 and 5 bars.
It consists of a DC motor, a pump and a safety valve (set at~7bars).
It is preceded (or followed) by the fuel filter which prevents any impurity in the circuit that could damage it and the rest of the elements of the injection system, in particular the injectors with their fine orifices. It also ensures the decantation of water in the fuel.

III. The high pressure pump
In the case of direct injection, the fuel is injected under high pressure, from 150 bars for gasoline engines to over 2000 bars for diesel engines.
It can be single or multi-piston. The pistons are actuated via a cam and compress the fuel.
The high-pressure pump is generally driven by the distribution system. Depending on the technology used, it is imperative to respect the timing of the latter by following the manufacturer's method.
It is equipped with a pressure regulator at the outlet to avoid any overpressure.
The pressurized fuel is either sent directly to the injectors (distributor pump + calibrated mechanical injectors) or to a common rail in which the pressure is accumulated for all the injectors (electrically controlled injectors).

A+

[manovlov]

Homework N°2

Hy Buddies ! Here are the questions from my second lesson.

1. What are the functions of the throttle valve?
2. What are the types of fuel injection systems used in automobiles?
3. What types of injectors are used in automobiles?
4. How can we easily differentiate between the types of injectors?
5. What is the stoichiometric ratio? What is its value?
6. What is the interest of octane in gasoline? Indicate the values used in France.
7. How are the spark plugs powered?
8. When are glow plugs used? What are the functions of the engine cooling system?
10. What are the characteristics of the coolant?
11. Why is the cooling system under pressure?
12. How and with what elements is the engine temperature regulated?
13. What types of lubrication are used in an engine?
14. Indicate what the following oil characteristics are: 5W40.
15. What is the role of supercharging?
16. What are the types of compressors and their drives?
17. Why is it important to use a heat exchanger on a supercharger circuit?

[matthew1]

15. What is the role of supercharging?

Answer:

Historically, supercharging has been used to quadruple the horsepower of large American muscle cars, thus increasing the rate of spin of Earth if one accelerates toward the East, or slowing Earth's spin if one accelerates Westward.

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