Papers by Keyword: Engines

Abstract: The combustion engines are widely used in the daily life of people, in cars, we find them with greater emphasis, and currently hybrid engines and electric motors are being used. In this analysis, one of the important factors for the failure of combustion engines is the temperature, for which cars have cooling systems, through the use of radiators and coolant-based systems. In this work we present a methodology for the analysis of the state of the components of the combustion engine system in cars, through the use and analysis of thermal images, for which it is necessary to identify the zones or control points depending on the model and type of engine and car, The analysis procedure requires a thermal camera, the results presented are related to the comparison of an optical and thermal image, in order to locate the control point, the method can be applied by mechanics, maintenance personnel and car drivers themselves, to analyze the condition of their car.

Abstract: The article describes a study of changes in the characteristics of engine oil after working in an internal combustion engine. Cost-effective replacement period for engine oil determined.

Abstract: This paper analyses the option of using pressure signal new descriptors for controlling a selected object. Pressure signal deviations from the pressure mean values were selected to be the example descriptors. A compression ignition combustion engine fuelled with mineral-and bio-fuels was chosen to be the reference object. The pressure signal was recorded during the combustion process in the cylinder.

Abstract: The crankshaft is exposed to numerous external extortions which generate bending, axial and torsional vibrations. Torsional vibrations are especially dangerous for a safe operation. They are generated by strongly dynamic loads, which come from the combustion processes of fuel-air mixture in cylinders and from the elements of drive system, and engine accessories. Until recently this problem concerned mainly the engines of high power, where dynamic effects generated the vibrations with amplitudes exceeding the limit values, which in effect led to failure of the engine. Crankshafts also significantly increased their torsional elasticity because of the common trend of reducing the engine mass. It resulted in the necessity of using the elements reducing the amplitude of torsional vibrations of the shaft. Rubber torsional vibration dampers are commonly used for this purpose. The author observed that while choosing torsional vibration dampers, the producers concentrated only on the criterion of reducing the amplitude of torsional vibrations below limit values. They forgot that the optimization criterion can be expanded in such a way so that a better effect can be obtained. What is more, safe and economical operation of the engine could be provided.