WorksheetsLV02.2 Common Rail Diesel Systems
Total questions: 20
Worksheet time: 10mins
Which of the following reasons are true for changing to common rail type diesels?
Greater weight
Cheaper to manufacture
Lower emissions
Better control of fuel
What pressure does the high pressure pump deliver fuel to the fuel rail at?
100 PSI
10,000 PSI
100 BAR
1800 BAR
Which of the following components are part of the common rail fuel system?
Spark plug
Fuel Rail
Timed Injection Pump
What component is the main controller of the fuel system?
ECU
Fuel Pump
Injector Wiring
Engine Wiring Harness
The fuel pressure regulator is controlled by what?
Pulse width modulation signal
12v signal
Earth switched
5v signal
If the fuel pressure regulator failed, what symptoms could occur?
Over revving
Difficult to start
Engine will blow up
Are common rail diesel engines direct or indirect injection?
Direct
Indirect
Why do the injectors carry out a post injection?
To use more fuel
Because they are faulty and stuck
To raise temperature for regeneration
What is the purpose of the EGR system?
To reduce NOX by recirculating burnt gasses
To earn manufacturers more money
To add extra power
What is the purpose of the fuel rail?
To store fuel at a high pressure
To carry fuel to the injectors
To regulate the fuel pressure
To allow access for technicians to test fuel pressure
Do common rail systems have higher or lower fuel pressures than conventional diesel engines?
Higher
Lower
What is the role of the additive fluid in a particle emission system?
The combustion process in the particulate filter is slowed down by introduction of the additive.
The additive has the role of reducing the combustion temperature of the carbon particles to approx. 500°C in order that regeneration of the particulate filter can be carried out even at part-throttle.
The additive is mixed with fuel via the fuel return line every time the fuel tank is replenished. Fuel then burns better and there are less carbon particles generated during combustion in the engine.
To reduce exhaust emissions there is a series of different technical solutions. Which statement is correct?
A reduction in emissions can be achieved by measures to the internal workings of the engine.
Release of particles that are produced during combustion can be prevented by external engine measures.
The reduction of exhaust emissions can be achieved by switching off internal exhaust gas recirculation.
Which sensors are required by the engine control unit for calculation of the carbon deposit level in the particulate filter?
The lambda probe
The air mass meter
The temperature sender before turbocharger
The pressure sensor 1 before particulate filter
The temperature sender before particulate filter
Which of the following is a primary function of a diesel particulate filter (DPF)?
To increase the engine's fuel efficiency by altering combustion timing.
To trap and remove soot particles from the exhaust gases before they are released into the atmosphere.
To cool down the exhaust gases before they exit the tailpipe.
What is the main purpose of exhaust gas recirculation (EGR) in emission control systems?
To filter out particulate matter from the exhaust gases.
To increase the oxygen content in the combustion chamber.
To reduce the formation of nitrogen oxides (NOx) by lowering combustion temperature.
Which statement best describes the regeneration process in a particulate filter system?
It is the process of adding more fuel to the engine to improve performance.
It refers to the cooling of exhaust gases before they reach the filter.
It involves burning off accumulated soot particles at high temperatures to clean the filter.
What is the main function of a high pressure fuel pump in a common rail diesel system?
To inject fuel directly into the combustion chamber
To deliver fuel at high pressure to the fuel rail
To filter impurities from the fuel
Which component is responsible for measuring the amount of air entering the engine in a common rail diesel system?
Fuel injector
Glow plug
Mass Air Flow (MAF) sensor
What could be a possible result of a clogged diesel particulate filter (DPF)?
Improved engine performance
Reduced engine power
Lower fuel consumption
