1. Inferential Control Control Using a Single Secondary Measurement

2. Objectives The concept of inferential control(IFC). Structure and analysis of control using one secondary measurement. Inferential control versus classical control strategies. Application of IFC to a distillation column control

3. Applications

4. Generic Inferential Control Problem

5. Classical Approaches: Feedback Control of Secondary Variable

6. Composition control using temperature

7. Classical Approaches: Cascade Control

8. Classical Approaches: Feedforward Control

9. Classical Approaches: Feedback Using an Output Estimator

10. 2 DOF Internal Model Control

11. Inferential Control Structure

12. Disturbance Estimator

13. Controller Design

14. IFC Structure

15. Example

17. Step Responses

18. Combining Feedback with IFC

19. Summary  Inferential Control is used when a measurement of the primary variable is not available.  Inferential control is similar to a cascade control strategy.  IFC can suppress disturbances detected by the secondary measurement.  IFC can lead to bias if model errors are present  When ever possible combine IFC with direct feedback control of primary variable even if it is infrequently measured.