Method for regenerating a compressed air supply device, control device and compressed air supply device

The method involves regenerating air dryer with compressed air from a compressed air circle, if that pressure lies within compressed air circle when target pressure value and a humidity value of the air dryer reached over a pre-determined target humidity value and terminating regeneration, if that pressure in the compressed air circle is bordering on pre-determined border pressure value. An independent claim is also included for electronic control equipment for controlling of compressed air feed circuit unit of a commercial motor vehicle.