الفهرس 
ABSTRACT
Common Rail System characteristicsOnly 14 pages are availabe for public view
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Abstract
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Common Rail Injection Fuel Systems (CRIFS) are becoming a more
widely used solution in the fuel systems of modern diesel engines, Because of it
is characterized by the traditional system that it deals with the high value of
pressure inside the system (over 2000 bar), which increases the efficiency of
combustion of fuel inside the combustion chamber. In addition, it does not
depend on the speed of injection fuel inside the combustion chamber which
electronically controlled by the DCU (Digital Control Unit) making it easy to
control the injection timing, shape and quantity of injection inside the
combustion chamber. However, due to the importance of the CRIFS and its
many advantages over the traditional system, there have been numerous studies,
and researches try to develop the performance and stability of the CRIFS system.
In particular, the development of the control of the common rail high-pressure
value inside the system and access to the lowest ratio of error in the trace value
required to improve the most stable level of the system.
The present study aims to improve the performance and stability by applying the
type of controller FUZZY CONTROLLER and compare it with the traditional
type PID CONTROLLER and emphasize the studying about the degree of the
stability and how to reach the lowest proportion error of pressure line within the
common rail pressure reference value. The model demonstrated how to
construct the conventional PID controller inside the system model and how it
worked and tuned to achieve the best result with it. The model also
demonstrated how to construct the FUZZY controller and how it works with its
best chosen fuzzy rules to achieve the best results inside the system compared
with the PID controller and other conventional controllers. An appropriate
mathematical model has been constructed and is a cross-sectional system, the
developed model includes four sub-systems which are a high-pressure pump,
common rail, pressure control valve and injector and The injector subsystem
contains four sub-models which are Solenoid, Working chamber, Needle and
Force equilibrium. All these sub-systems including electrical, mechanical and
hydraulic models are based on four laws they are Kirchhoff’s law, conservation