Modelling of E-Clutch Axial Dynamics Based on Experimentally Identified Clutch Component Stress-Strain Characteristics

E-clutch systems allow for a conventional or electrified powertrain control system to operate the transmission clutch for expanded functionalities, reduced fuel consumption and improved driving comfort. To facilitate E-clutch control system design and enable its simulation verification, an accurate E-clutch model is required. The paper presents a lumped-parameter E-clutch axial dynamics model parameterized based on experimentally identified stress-strain characteristics of individual components of disassembled clutch. An initial, simplified model is firstly presented and parameterized based on overall, input-output stress-strain characteristic identified. While the experimental validation results show that the initial model provides satisfactory prediction of the clutch torque static curve, prediction of release bearing force static curve is worse, thus indicating a potential for further model improvements. Therefore, new, more detailed versions of model containing individual component stress-strain characteristics are proposed and experimentally validated. The validation results indicate considerable improvements in normal force static curve prediction accuracy when using the extended model.