الفهرس 
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Abstract
In this proposed system, a pneumatic motor starter coupled to the engine flywheel type will be used as an additional system to the current electrical starter method for IC engines, where the pneumatic starting system used as a primary starting system when the pneumatic system is failed to start the engine, the electric starting system comes into operation.
This technique is effective for reliable start and increases the service life of both battery and starter motor, and also for the safety of vehicles and passengers. Especially, for the tractors and commercial vehicles (i.e., Lorries, tractors, and buses), where the pneumatic system is already in the place for other uses such as opening/closing the doors and/or braking system. So, there is no need to build another system. Further, depending only on the electrical starting system is not safe for these vehicles which usually work on area faraway maintenance center and are difficult to start by pushing or pulling like a small automotive. In this way; the traffic delay due to the starting system failure can be avoided, the number of starting cycles will be increased, and drivers can start/stop the engine during idling so; the fuel consumption and air emissions will be reduced.
This thesis presents an investigation of the modeling and simulation of a compressed air starting system in a comparison with the current electric starting system. Most Internal combustion engines (ICE) are usually started by an electrical starting system. The pneumatic starting system has many successful applications at large combustion engines, such as the marine ICE, emergency diesel engine in nuclear power plants, and a gas turbine engine. The ways of starting a combustion engine with compressed air; are to use a pneumatic motor coupled to the engine flywheel or to inject the compressed air directly into the engine cylinders.
MATLAB / SIMULINK-SIMCAP R2013a and the Automation Studio Program environments have been utilized for modeling, simulating, and automating the pneumatic and electric starting systems components including pressurized tank, direction control valve, pneumatic motor, battery, DC motor, and the produced load during engine cranking.
An Electronic Control Unit (ECU) is designed and programmed by using a microcontroller that is employed to control the transition process from the pneumatic to the electric starting system in accordance to the vehicle engine operating conditions. Starting system prototype is implemented to validate the simulation results. The performance of the proposed starting systems and its control is analyzed and investigated