Errors estimation and refining methods for the numerical computation in real-time control systems

In the field of industrial control, the numerical devices are widely used. There are more issues that can affect the precision of the numerical control and it can induce significant errors in the control structure. These issues, discussed in this article, are: the discretization methods used to elaborate the discrete control algorithms, the value of the sampling rate, the numerical error representation in the computing devices and the quantization error. In this paper we try to make an analysis of these errors and to propose methods that can provide error reduction.