Editing Proportional–integral–derivative controller (section)

===Other improvements===
In addition to feed-forward, PID controllers are often enhanced through methods such as PID [[gain scheduling]] (changing parameters in different operating conditions), [[fuzzy logic]], or computational verb logic.<ref>{{cite journal | last= Yang | first= T.|title= Architectures of Computational Verb Controllers: Towards a New Paradigm of Intelligent Control | journal= International Journal of Computational Cognition | volume= 3 | issue= 2 | pages= 74–101 |date= June 2005 | citeseerx= 10.1.1.152.9564}}</ref><ref>{{cite journal | last1= Liang | first1= Yilong | last2= Yang | first2= Tao |title= Controlling fuel annealer using computational verb PID controllers | journal= Proceedings of the 3rd International Conference on Anti-Counterfeiting, Security, and Identification in Communication | series= Asid'09 |pages= 417–420 | year= 2009 | isbn= 9781424438839 | url=  http://dl.acm.org/citation.cfm?id=1719210&preflayout=tabs }}</ref> Further practical application issues can arise from instrumentation connected to the controller. A high enough sampling rate, measurement precision, and measurement accuracy are required to achieve adequate control performance. Another new method for improvement of PID controller is to increase the degree of freedom by using [[fractional calculus#PID controllers|fractional order]]. The order of the integrator and differentiator add increased flexibility to the controller.<ref>{{cite journal | vauthors = Tenreiro Machado JA, et al | title = Some Applications of Fractional Calculus in Engineering | journal = Mathematical Problems in Engineering | volume = 2010 | pages = 1–34 | date = 2009 | doi = 10.1155/2010/639801 | hdl = 10400.22/4306 | doi-access = free | hdl-access = free }}</ref>