
238 Magnetorheological Fluid Technology: Applications in Vehicle Systems
In this test, the desired temperature is set to be 45 ± 1°C. Before acti-
vating the sliding mode controller, the cooling system is operated without
control input to the MR fan clutch. Figure8.16 shows the coolant tempera-
ture in the condition without control action. In this case, the cooling fan
is transmitted to the torque only by the viscosity of the MR uid. Thus,
the coolant temperature cannot reach the desired temperature. Figure8.17
shows the coolant temperature control result using the sliding mode con-
troller. Figure8.17(a) is the temperature control