Research On Active Damping Control Of Hybrid Engines And Its Optimazition

With the restriction of emission and energy-saving,the electrification of powertrain has become one of the most potential technology routines.Hybrid Engine,who has combined the advantages of advanced combustion mode,alternative fuel and hybrid technology,is a promising method of achieving the electrification of powertrain.To give a practical solution of improving fuel economy at partial load and suppressing the vibration under low speed range,this dissertation has conducted researches on dynamic process control basing on active damping control algorithm.On this basis,the active vibration damping control is optimized,expanded and researched at three levels:directional vibration suppression at single working point,fuel economy improvement and speed fluctuation suppression in partial load range,and fuel consumption improvement under different driving cycles.Firstly,some upgrades of the Hybrid Engine experiment platform are conducted to satisfy the research needs.Those upgrades are:(1)a new Hybrid Engine experiment platform with a configuration of range extender is built-up;(2)The data sampling system of this platform is upgraded;(3)The controlling system of a parallel Hybrid Engine experiment platform is then upgraded.Secondly,aiming at achieving directional vibration suppression in single-point conditions,an active vibration damping control algorithm based on motor torque compensation technology is adopted in this dissertation.The essential part of this algorithm is the waveform designing of compensation torque.The effect of active damping control on suppressing vibration is highly related to the waveform designing of compensation torque.In this dissertation,seven different compensation torque waveforms are designed by exhaustive method,and the effectiveness of active damping control algorithm under different compensation torque waveform design,the excitation source of isotropic vibration,as well as the effect of different waveforms on isotropic vibration suppression are experimentally studied based on the above experimental platform.Finally,based on the experimental data,a novel method for directional suppression of hybrid engine vibration based on active damping control is proposed and constructed.Thirdly,aiming at improving fuel economy under partial load conditions,cylinder deactivation is adopted.However,the adoption of cylinder deactivation will enlarge the speed fluctuation of the whole system.To cope with this problem,this dissertation expands the function of active damping control algorithm.And then,a coordination control strategy by utilizing the motor is constructed based on an instantaneous speed observer.The improvement of the fuel economy and the suppression of speed fluctuation under this coordination control strategy are researched by experiments.And the experiment results show the effectiveness of this coordination control strategy in suppressing speed fluctuation.Finally,aiming at saving fuel consumption of Hybrid Engine under different driving cycles,the influence of active damping control on the efficiency of electric power generation under steady conditions,the electric energy consumption during start-up process or shut-down process and the influence of active damping control on fuel consumptions under different driving cycles are conducted in this dissertation.Basing on the results of those researches,an optimization strategy to improve fuel economy is proposed in the end by using active damping control,cylinder deactivation and dynamic programming.And simulation results show that the fuel consumption under different driving cycle is reduced by 3%～5.5%。...