Abstract
Abstract:
Abstract should not contain more than 200 words. It should provide essential information on your research. Rapid development of the motors and motor vehicles, whose target is to keep motor vehicle in use, in electronic era, has for a consequence extensive use of mechatronic modules on vehicles. These are modules which control processes in engine (combustion process, injection process, ...) as well as processes on vehicle (synchronization of engine´s and transmission´s work, processes of vehicle stability during braking and steering, etc.). Parameters of the processes control in internal combustion engine (IC engine) are especially sensitive. They essentially define the most important criterions for efficacy grade of one vehicle, and these criterions are emission of pollutants and energetic efficiency of engine.
On the process of combustion in IC engine, as the most important process, act a lot of input parameters, from fuel quality, form of bringing and mixing fuel with air, to the process of mechanical stoppages which can be obtained in encirclement of the combustion space. These processes, especially in starting phase of stoppage, can be difficult identified. Therefore, at the present time, big attention is given for a diagnostics of exactly these parameters, so called free-of-contact measuring methods which do not have an influence on engine´s work. On the first place, it is measuring of the torsion angle (vibration) around crankshaft balance position. Properly measured signal of crankshaft vibration angle allows decryption of the error in engine work process. For such approach it is important to have on disposal enough realistic model of the crankshaft torsion-vibrating system, with properly defined input parameters.
In this work it will be presented one real model of torsion-vibrating system with model parameters and shown signal of the crankshaft torsional angle for the case of piston-cylinder jamming process, which results because of: failure on LDA corrector of fuel supply, turbo compressor failure, or disturbance of injection angle. Extreme case of jamming with total absence of fuel firing in one cylinder will also be analyzed. Based on such signals of crankshaft torsion, in relation with correct engine work, can be decrypted cause of failure on the engine.
Keywords:IC engine, torsional vibration, diagnostics