Chien-Hrones-Reswick Autotuning Method
- Updated2025-04-01
- 4 minute(s) read
The Chien-Hrones-Reswick autotuning method focuses on setpoint response and disturbance response. This method provides formulas for 0% and 20% overshoot.
Note You must use the
PID Autotuning Design
VI to implement this autotuning method. Select the Chien-Hrones-Reswick polymorphic instance and use the
Tuning specifications
input to configure which formula you want to use.
The following tables shows the Chien-Hrones-Reswick recommendations for each tuning formula:
| Regulator – 0% overshoot | |||
|---|---|---|---|
| Controller | Kc | Ti | Td |
| P | 0.3
TP /
 |
— | — |
| PI | 0.6
TP /
|
4
|
— |
| PID | 0.95
TP /
|
2.4
|
0.42
|
where
TP is the time constant and
is the deadtime.
| Regulator – 20% overshoot | |||
|---|---|---|---|
| Controller | Kc | Ti | Td |
| P | 0.7
TP /
|
— | — |
| PI | 0.7
TP /
|
2.3
|
— |
| PID | 1.2
TP /
|
2
|
0.42
|
where
TP is the time constant and
is the deadtime.
| Servo – 0% overshoot | |||
|---|---|---|---|
| Controller | Kc | Ti | Td |
| P | 0.3
TP /
|
— | — |
| PI | 0.35
TP /
|
1.2
|
— |
| PID | 0.6
TP /
|
|
0.5
|
where
TP is the time constant and
is the deadtime.
| Servo – 20% overshoot | |||
|---|---|---|---|
| Controller | Kc | Ti | Td |
| P | 0.7
TP /
|
— | — |
| PI | 0.6
TP /
|
|
— |
| PID | 0.95
TP /
|
1.4
|
0.47
|
where
TP is the time constant and
is the deadtime.