Oscillation suppression in the energy-power unit when starting a modern engine

The article is devoted to the study of the dynamics of starting a modern engine as well as the assessment of the dynamic load of transmission elements connected to the engine. The process was studied experimentally while starting a real engine equipped with a modern fuel control system Common Rail. In this case, we determined the time functions of the moment, the angular velocity of the motor shaft, the cyclic fuel supply, the advance angle of the injection, and the oscillating process parameters of engine start. Based on the experimental data, a simulation model was developed with the Amesim software package, the parameters and the initial conditions of which correspond to the actual process. This takes into account the possibility of introducing a nonlinear elastic-dissipative coupling between the engine flywheel and the driving element of the transmission. Basing on the simulation results, we establiched the dependencies of the dynamic moment amplitudes on the engine acceleration and the elastic-dissipative coupling parameters. Basing on the research results, we substantiated the lines of improvement of engine start process which ensure a relevant dynamic load. The results are innovative in the field of studying the dependency of the dynamic moment amplitudes on the acceleration and the parameters of the elastic-dissipative coupling (connection) between the engine and the transmission. Basing on the obtained results, we substantiated the lines of improvement of the engine start process. The prospects of use consist in the possibility to optimize the control parameters of the fuel supply system in a modern diesel engine, taking into account the dependency of the process on the transmission properties and its operation features. The practical value of the research results consists in studying the excitation conditions of resonance oscillations in the engine-transmission system during the engine start and in solving the inverse task, that is determining the required value of engine acceleration during the engine start and selecting the elastic-dissipative parameters of the suppressor that limits the dynamic moment amplitudes.