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Table 4 Controller gain parameters boundary limits

From: PID, BFO-optimized PID, and PD-FLC control of a two-wheeled machine with two-direction handling mechanism: a comparative study

Controlled parameter

Gain parameter

Upper boundary

Lower boundary

Loop 1

δ R

Kp 1

20

− 20

Kd 1

20

− 20

Ki 1

0.1

− 0.1

Loop 2

δ L

Kp 2

20

− 20

Kd 2

20

− 20

Ki 2

0.1

− 0.1

Loop 3

θ

Kp 3

50

− 50

Kd 3

10

− 10

Ki 3

0.1

− 0.1

Loop 4

h 1

Kp 4

20

− 20

Kd 4

10

− 10

Ki 4

0.1

− 0.1

Loop 5

h 2

Kp 5

60

− 60

Kd 5

50

− 50

Ki 5

0.1

− 0.1