Device for controlling rotational speed for e.g. ventilator for cooling components of vehicle

摘要

The fluid clutch provides a variable speed control, eg. for a blower in a vehicle. The device includes a temperature control (4) has inputs from the various monitoring points in the fluid cycle and in the vehicle and provides computed values for the blower speed. These are compared with actual values in a speed control (6) on the output of the temperature control. The control system effectively takes into account the shear properties of the clutch fluid to provide an improved speed control for the blower. The speed control operates in a chopped mode with a square wave signal with variable clocking rates. The control operates with programmed values for the motor torque, blower speed, temperature ranges etc.