Powertrain Match And Control Strategy Research Of ISG Moderate HEV

In today’s world, energy and environmental issues have been caused widespread concern, the new energy vehicles with low fuel consumption and low emissions have become the focus of the research and develop by the world’s major automobile manufacturers. In the current field of new energy vehicles, hybrid electric vehicles are the most practical models and could be mass-produced. Generally, hybrid electric vehicles have two sources of power:engine and electric motor. This paper takes a ISG hybrid system as the research object, a dynamic torque coordination control strategy is designed based on torque control strategy, researching the problem of coordination control between the sources of power in-depth, this provide a new method for the study of multi-energy control of hybrid vehicles.Firstly, the current research situation of the hybrid control strategy and dynamic coordination control are introduced especially, and represent the need of dynamic coordination control; taking the dynamic property, economical efficiency and vehicle costs as the consideration, the structural layout scheme of ISG hybrid system is definited, and combing with the vehicle design specifications to complete the selection of powertrain components and parameters match.Secondly, put emphasis on the design of dynamic torque coordination control strategy for ISG hybrid system. The key of control strategy is composed of torque control strategy and dynamic coordination control strategy. The torque control strategy is based on SOC/torque balance control strategy, put the optimal engine efficiency as precondition to determine the vehicle running status, and reasonable allocate the target torque of the source of power; dynamic coordination control strategy make up for dynamic characteristics differences of them by the method that ISG motor torque compensate for engine torque, and put the vehicle impact degree as evaluating indicator of dynamic coordination control.Finally, to adopt the method which experimental modeling is primarily and theoretical modeling is to assist, forward ISG hybrid system simulation model is established on the platform of MATLAB/SIMULINK, including the driver model, the vehicle controller model, the powertrain model, the driveline model and the vehicle driving dynamics model, the offline simulation based on MATLAB/SIMULINK and hardware in the loop simulation based on dSPACE are carried on against the dynamic torque coordination control strategy, simulation results show that the dynamic torque coordination control strategy can achieve coordination control between the source of power, control the torque ripple during the state switching process effective and improve the driving comfort.