This subsystem models a viscous clutch via a point mass.
The warming up hystereses are defined via the following inputs:
- Mass of the point mass (represents the housing + the fluid inside the viscous clutch)
- Heat transfer coefficient: defined over a characteristic curve dependent on the air mass flow (the higher this value is, the lower is the difference between engaging- and disengaging temperature)
- Engagement Ratio: defined over a 3D-map dependent on engine revolutions and the temperature of the point mass (the median of the hysteresis in the disengaged case is defined via the temperature of mass for 0% engagement and the median of the hysteresis in the engaged case is defined via the temperature of mass for 100% engagement, thus the slope of the hysteresis is defined as well, see the green curves in the picture below)
Furthermore the transmission ratio from engine speed to the input speed of the viscous clutch is modeled via a constant factor. And the transmission from the clutch-input speed to the fan speed is modeled via a 3D-map (“fan_rpm”) dependent on the engagement Ratio.
Usable from release: KULI 9.1-0.01
Necessary modules: KULI base + KULI drive