1. A method for fuzzy control of a device, comprising the steps of: forming a control difference comprising at least one unsharp quantity having varying values with a probability density distribution of said values; supplying said control difference to a fuzzy controller; in said fuzzy controller, normalizing said probability density distribution to a predetermined value to obtain a normalized probability density distribution; conducting a fuzzy logic inference procedure in said fuzzy controller using said normalized probability density distribution to determine a membership degree of said probability density distribution to form a manipulated quantity; and controlling said device dependent on said manipulated quantity.