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• W2076358445 startingPage "1080" @default.
• W2076358445 abstract "The (P–ω) method is a model-based approach developed for determining the instantaneous friction torque in internal combustion engines. This scheme requires measurements of the cylinder gas pressure, the engine load torque, the crankshaft angular displacement and its time derivatives. The effects of the higher order dynamics of the crank-slider mechanism on the measured angular motion of the crankshaft have caused the (P–ω) method to yield erroneous results, especially, at high engine speeds. To alleviate this problem, a nonlinear sliding mode observer has been developed herein to accurately estimate the rigid and flexible motions of the piston-assembly/connecting-rod/crankshaft mechanism of a single cylinder engine. The observer has been designed to yield a robust performance in the presence of disturbances and modeling imprecision. The digital simulation results, generated under transient conditions representing a decrease in the engine speed, have illustrated the rapid convergence of the estimated state variables to the actual ones in the presence of both structured and unstructured uncertainties. Moreover, this study has proven that the use of the estimated rather than the measured angular displacement of the crankshaft and its time derivatives can significantly improve the accuracy of the (P–ω) method in determining the instantaneous engine friction torque." @default.
• W2076358445 created "2016-06-24" @default.
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• W2076358445 date "2006-04-01" @default.
• W2076358445 modified "2023-10-14" @default.
• W2076358445 title "Enhancement of the accuracy of the (P–ω) method through the implementation of a nonlinear robust observer" @default.
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• W2076358445 doi "https://doi.org/10.1016/j.jsv.2005.07.029" @default.
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