Chapter 1 - Fuel Delivery System

Below are the right aim of EMS, except...

• Produce better handling of vehicle

• Produce low levels of gaseous and particulate emissions.

• Produce low fuel consumption.

• Produce low noise levels and vibrations.

• Produce high power output and torque.

What is the primary function of carburetor?

• Produce spark to ignite air fuel mixture

• Mix air and engine oil to burn the engine

• Mix nitrogen and oxygen to produce carbon dioxide

• Mix air and fuel to make a combustion mixture.

What replaced carburetors in modern engine?

• Electric motor

• Common-rail Direct Injection System

• Electronic Fuel Injection systems

• Hybrid systems

What type of fuel used in carburetor?

• Gasoline

• Diesel

• Compressed Natural Gas

• Hydrogen

• Coal

What is the purpose of main jet in carburetor?

• Regulate engine timing to achieve idle engine speed

• Regulate the fuel flow rate into the carburetor's venturi.

• Regulate air flow during engine startup.

• Prevent contaminants and debris from entering the engine.

Select the right component of a Commonrail Direct Injection System

• Injector

• Engine Control Unit

• High Pressure Pump

• Fuel Pressure Sensor

• Carburetor

Why fuel pressure is important for diesel fueled engine?

• High pressurize fuel potentials minimizing fuel consumption. It is to ensure the engine running with low fuel cost.

• High pressurize diesel yields a finely atomize of spray. It can mix evenly with compressed air, facilitating complete combustion, maximizing power output while minimizing emissions.

• High pressurize of diesel injection spray can penetrate further to the cylinder wall and into the piston crevice. This fuel provides lubrication between the cylinder wall and piston skirt. Friction reduction between them resulting in lowers fuel consumption.

• High pressurize of diesel increases air-fuel mixture pressure during the intake stroke. During the compression stroke, this air-fuel mixture is recompressed and doubling its pressure. During the power stroke, this fuel mixture is combust and tripling its pressure and produce high power output.

What does the fuel injector do?

• Injects fuel into the engine.

• Provides vaccine to the engine.

• Confirming proper air-fuel ratio.

• Starts the engine

What is the current focus of common rail technology?

• Lower fuel consumption so that the vehicle can move slow and safe.

• Reduce fuel consumption so that reducing fossil fuel dependency.

• Lower fuel consumption and carbon dioxide emission to comply with the current emission regulation.

• Improve engine performance so that the vehicle can moving faster.

As you can see, the evolution of common-rail technology has stopped at 300 MPa since 2012. In your opinion, why its happen? Select TWO (2) possible opinion.

• Current common-rail fuel pressure is already sufficient.

• High pressurize of diesel than 300 MPa is dangerous and can self-explode.

• High pressurize of diesel more that 300 MPa is hard to be achieved and can damages the fuel line.

• High pressurize of diesel more than 300 MPa will produce extremely atomize of fuel spray than can emits radioactive after combustion.

• High pressurize of diesel more than 300 MPa provides mechanical load to the engine and reduces its efficiency.