QFD - Professional Tools for Feedback Design for Matlab©

DFT developed professional tools for control law synthesis.  All under the name QFD, an abbreviation of “Quantitative Feedback Design”.

The mission of QFD is to:

  • Synthesize the best and probably surprising solutions for the problem posed by the designer in a very short time


  • Free the designer from further investment because he/she know that the problem can’t be solved any better


  • Help the designer in specifying plant improvements for best performance as reflected from possible control lows


  • In general, support the control engineer for fast performing loop-shape, especially with several available sensors.


The heart of QFD is a control law synthesizer engine. 

Some of the issues dealt by this extremely efficient engine are:

  • Plant uncertainties


  • Plants given only by frequency domain measurements


  • User-specified preferences and constraints


  • User-specified weighting of performance objectives


  • User-specified control low such as PID, Cascaded, etc. and where to locate low-pass and /or notch and/or other filters


  • Multiple control inputs


  • Multiple sensors


  • Unstable and non-minimum phase plants


  • Very broad range of control architectures


  • MIMO design which by-pass the trial and error of loop-shaping process


The QFD package exposes the QFD engine for a very diverse range of control problems.

DFT offers QFD for in several modes for SISO, SIMO and MIMO

  1. Expert mode (All design parameters are at the user disposal)


  1. Semi-fully-automatic mode (Relevant design parameters are at the user disposal)


  1. Fully-automatic mode, i.e., “Button Mode” which suits an application which the user repeats using it.



Read more about QFD Toolbox


  • Quantitative Feedback Design (QFD)