الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 149 |  |  |
| | | from | 149 | | |
Abstract
A micro-computer based control system is
designed and manufactured to control the speed of
a single-cylinder four-stroke spark ignition
engine. A test rig has been prepared to achieve
the above requirement.
The test rig is composed of an engine
generator set, electrical loading facilities,
recording and control elements and a microcomputer.
The fuel and air feeding systems have
been modified to suit the new control system. A
computer software is specially devised to record
engine speed, compares it with a reference preset
value then decides the correct amount of fuel and
air to attain the specified engine speed with the
lowest allowable error.
Electronic circuits were designed to handle
the computer signals and send it to the fuel and
air stepper motors to adjust fuel and air mass
flow rates. The effect of using a Proportional,
Integral and dervative, PIO, controller was
studied experimentally to obtain the best
parameters for fast response and good engine
stability.
Experimental results show that the engine
control system can maintain the speed with a
maximum droop of 1.5% for most engine operating
conditions. Increasing the controller gain may
result in engine instability.
i