Control Strategy Development of Driveline Vibration Reduction for Power-Split Hybrid Vehicles

Abstract

In order to achieve better performance of fuel consumption in hybrid vehicles, the internal combustion engine is controlled to operate under a better efficient zone and often turned off and on during driving. However, while starting or shifting the driving mode, the instantaneous large torque from the engine or electric motor may occur, which can easily lead to a high vibration of the elastomer on the driveline. This results in decreased comfort. A two-mode power-split hybrid system model with elastomers was established with MATLAB/Simulink. Vibration reduction control strategies, Pause Cancelation strategy (PC), and PID control were developed in this research. When the system detected a large instantaneous torque output on the internal combustion engine or driveline, the electric motor provided corresponding torque to adjust the torque transmitted to the shaft mitigating the vibration. To the research results, in the two-mode power-split hybrid system, PC was able to mitigate the vibration of the engine damper by about 60%. However, the mitigation effect of PID and PC-PID was better than PC, and the vibration was able to converge faster when the instantaneous large torque input was made. In the frequency response, the effect of the PID blocking vibration source came from the elastomer was about 75%, while PC-PID additionally reduced 8% by combining the characteristics of the two control methods.

Active damping control of HEVs using Ansys and Matlab/Simulink software

“…An instruction set is transmitted to each component actuator, along with the corresponding action, based on this input, as well as the information obtained by the vehicle control system. The development's control system is primarily responsible for coordinating the internal combustion engine and electric motor [20], as well as maintaining a suitable level of charge in the hybrid battery pack and safeguarding the battery pack. Engine and electric motor coordination are dependent upon the driver's purpose, as expressed by the accelerator and braking pedals.…”

Internal Combustion Engine Starting and Torque Boosting Control System Design with Vibration Active Damping Features for a P0 Mild Hybrid Vehicle Configuration

“…Apart from the aforementioned advantages of hybrid electric and fully electric vehicles in terms of reduced greenhouse gases' (GHG) emissions and quieter operation, which are especially valued in urban operation, there are also other advantages of a partial or a fully electrified road vehicle power train [11]. Namely, due to HEVs being equipped with one or more controlled electrical machines [12], the electrified power train can feature driveline torsional vibration damping control [13], as well as torque boosting and torque filling functionalities [14,15]. These features can then be used to reduce vehicle jerking during starting/launching [16] and to generally improve the drivability of passenger vehicles, such as buses [17].…”