1. Part IV ：Enhancements to Single-Loop PID Feedback Control

2. @ Control enhancements are chosen based on the following criteria:
Reinforce principles: ‘strong’ control theory
Demonstrate practice
Apply process insight: understanding of process equipment and operating conditions

3. Chapter 14 Cascade Control
Cascade uses an additional measurement of a process variable to assist in the control system
@ Cascade design criteria

4. Ex. Stirred-tank heat exchanger with cascade control

5. S1. Cascade control is superior to single-loop control

6. S2. Cascade controller
S3. Two controller names

7. S4. Block diagram

9. @ Rejection of stochastic secondary disturbance
Cascade control

10. Cascade examples
1. Packed-bed reactor

11. 2. Heater exchanger
3. Pressure control

12. 4. Jacketed CSTR

13. @ Distributed decision making by cascade structure