TC act as hydraulic dampers to interrupt vibration propagation originated from either engines or road bumps and
to provide torque multiplication during vehicle launch [5]. Since TC is essentially a damper, losses are not negligible.
However, these losses can be reduced by employing a TC bypass clutch, which mechanically connects the TC pump
and the turbine when the clutch is engaged. This connection improves TC efficiency at the price of losing the capability to absorb oscillations in the powertrain. A compromising solution is proposed by Kazemi et al., allowing 1 to 2% of clutch slip to achieve similar results as the TC is working as a damper [4]. Obviously, people desire to minimize this slip for efficiency consideration. This type of bypass clutch is a so called minimal slip-type TC clutch.