
253Magnetorheological (MR) Applications for Heavy Vehicles
identied that the proposed sliding mode controller well follows the desired
temperature with a small regulating error. In addition, it was shown that the
reaching time of the sliding mode controller is faster than that of the PID con-
troller, owing to the robustness against the uncertain time constant of the
converter and fan clutch. It is generally well known that an automotive fan
clutch is one of the major equipments in an engine cooling system and the
performance of the clutch is directly related to fuel efciency of the engine.
Therefore, it is expected that the proposed contro ...