Torque Model with Fast and Slow Temperature Dynamics of a Slipping Dry Clutch
The transmitted torque in a slipping dry clutch is
studied in experiments with a heavy duty truck. It is shown
that the torque characteristic has little or no dependence on
slip speed, but that there are two dynamic effects that make
the torque vary up to 900 Nm for the same clutch actuator
position. Material expansion with temperature can explain both
phenomena and a dynamic clutch temperature model with two
different time constants is developed. The dynamic model is
validated in experiments, with an error of only 3% of the
maximum engine torque, and is shown to improve the behavior
significantly compared to a static model.
Andreas Myklebust and Lars Eriksson
2012
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