Friction Model for Real-Time Simulation of Powertrain Dynamics

Clutch friction modeling in powertrain system is the key to realize the real-time and accurate simulation of the powertrain system, and it will have a significant effect on the accurate simulation of the nonlinear characteristics of the powertrain system. Friction models can be divided into two categories: discontinuous friction models and continuous friction models. The approach of dealing with zero velocity discontinuity will affect the numerical stability of the real-time simulation in the discontinuous friction models. The smaller simulation step usually required by continuous friction models will reduce the efficiency of the simulation. Therefore, how to establish and select the friction model is one of the difficulties in the powertrain system modeling. In this article, with the standard of high computational efficiency and numerical stability, simulation research on typical friction model used in real time simulation has been done. At the same time, some friction models of them are improved. A real-time simulation model of the powertrain system is established and the selected friction models are applied to the clutch modeling. The simulation results show that the friction model accurately simulates the changes in speed, torque and friction state during the clutch engagement, and is better able to meet the requirements of real-time and accurate simulation of powertrain system.