WordNet (r) 3.0 (2006):

self-regulating
    adj 1: designed to activate or move or regulate itself; "a self-
           activating sprinkler system" [syn: self-acting, self-
           activating, self-moving, self-regulating]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "self-regulating":
   automated, automatic, automatous, cybernated, self-acting,
   self-active, self-adjusting, self-closing, self-controlled,
   self-cooking, self-directed, self-directing, self-dumping,
   self-governed, self-governing, self-lighting, self-operative,
   self-regulative, self-starting, self-winding, self-working,
   semiautomatic, spontaneous