Abstract
In order to ensure a high level of performance and to comply with the increasingly severe limitations in terms of fuel consumption and pollution emissions, modern diesel engines need continuous monitoring of their operating conditions by their control units. With particular focus on turbocharged engines, which are presently the standard in a large number of applications, the use of the average and the instantaneous turbocharger speeds is thought to represent a valuable feedback of the engine behavior, especially for the identification of the cylinder-to-cylinder injection variations. The correct operation of the injectors and control of the injected fuel quantity allow the controller to ensure the right combustion process and maintain engine performance. In the present study, two different techniques are presented to fit this scope. The techniques are discussed and experimentally validated, leading to the definition of an integrated control strategy, which features the main benefits of the two, and is able to correctly detect the cylinder-to-cylinder injection variation and, consequently, properly correct the injection in each cylinder in order to balance the engine behavior. In addition, the possibility of detecting misfiring events was assessed.
Highlights
The reliability and efficiency of internal combustion engines make them the most applied technology solution throughout the world in multiple roles, such as transport, power generation, and industrial application
The experimentalactivity activitywas wasperformed performed on a YANMAR four-stroke, The experimental four-stroke,four-cylinder, four-cylinder,turbo-diesel turbo-diesel enginewith witha adisplacement displacementofof2100
This section is focused on the calibration and assessment of the developed methodologies carried out with the new set of injectors by imposing several injection variations in the cylinders at different out with the new set of injectors by imposing several injection variations in the cylinders at different loads loads and and speeds speeds in in the the whole whole engine engine operating operating range range
Summary
The reliability and efficiency of internal combustion engines make them the most applied technology solution throughout the world in multiple roles, such as transport, power generation, and industrial application. In order to guarantee a high level of performance and to comply with challenging new regulations, continuous supervision of engine operating conditions is needed (e.g., [1,2]), with particular reference to fuel consumption [3], combustion control [4], and pollution emissions [5,6]. To this end, the monitoring of the engine’s thermodynamic cycle is the most suitable approach.
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