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Modeling and fuzzy control of the engine coolant conditioning system in an IC engine test bed
Seyed Saeid Mohtasebi,Farzad A. Shirazi,Ahmad Javaheri,Ghodrat Hamze Nava 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.11
Mechanical and thermodynamical performance of internal combustion engines is significantly affected by the engine working temperature. In an engine test bed, the internal combustion engines are tested in different operating conditions using a dynamometer. It is required that the engine temperature be controlled precisely, particularly in transient states. This precise control can be achieved by an engine coolant conditioning system mainly consisting of a heat exchanger, a control valve, and a controller. In this study, constitutive equations of the system are derived first. These differential equations show the second- order nonlinear time-varying dynamics of the system. The model is validated with the experimental data providing satisfactory results. After presenting the dynamic equations of the system, a fuzzy controller is designed based on our prior knowledge of the system. The fuzzy rules and the membership functions are derived by a trial and error and heuristic method. Because of the nonlinear nature of the system the fuzzy rules are set to satisfy the requirements of the temperature control for different operating conditions of the engine. The performance of the fuzzy controller is compared with a PI one for different transient conditions. The results of the simulation show the better performance of the fuzzy controller. The main advantages of the fuzzy controller are the shorter settling time, smaller overshoot, and improved performance especially in the transient states of the system.
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Ehsan-o-llah Ettefaghi,Hojjat Ahmadi,Seyed Saeid Mohtasebi,Alimorad Rashidi 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
This study investigated anti-wear properties of SAE-20W50 engine oil, containing fullerene spherical nanoparticles, carbon nano balls and vanadium oxide nanotubes. Three kinds of wear tests including four-ball test, pin on disc test and engine tribo-test were done on base oil and nano lubricants, which were made at 0.1%wt concentration. The results obtained from four-ball standard tests indicated 5-15% reduction in rate of wear in nano lubricants. In addition, the results of pin on disc and engine tests on sliding bearings showed that the amount of wear and surface quality of bearings in nano lubricants with respect to the base oil considerably improved.
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