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Defining Engine Closed-Loop Control For Individual Cylinder Signaturing |
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Computer Science & Software Engineering Digital Systems Honours Project, 2004 Warwick Brown 13074016
Abstract: This paper explores methods of engine management that improve on the existing technology used today. The specific method of engine management that is explored in this paper consists of creating an individual signature for each of the engines’ cylinders, and using this signature to control the fuel injection process. Controlling the injection process in this manner offers a number of improvements to the combustion process. These improvements are not only limited to areas such as economy and power, but also to the possibility of compensating for individual cylinder characteristics that exist when the engine is built, and as it wears over time. This paper shows in detail that these cylinder differences do actually exist, and have a considerable effect on combustion behavior. An extension on this phenomenon is also undertaken, consisting of a revised software implementation that uses differences learned to compensate for these individual cylinder characteristics. The overall result of this revised injection implementation demonstrates an area of improvement that could be implemented into engine management systems commercially. It’s evident today that international pressure from environmental groups in relation to automotive emissions is forcing car manufacturers to improve their existing engine technologies. The method of improving combustion behavior employed in this paper is one such way in which manufacturers can achieve this. This method of compensating for individual cylinder characteristics also has the possibility of being developed into a system that, over time, adapts to everyday engine wear. By adaptively changing the cylinders individual signature in a closed-loop control manner, high emission standards and economy can be achieved over the engines whole operating life.
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