step response for tuning PID

Thread Starter

Kadav

Joined May 11, 2018
130
Hello i am reading about step response for tuning PID but i do not understand it , can someone give me some simple explanation of what it is please , in a comprehensicve way
 

MrChips

Joined Oct 2, 2009
21,647
Step response means that you disturb the system with a step function, i.e. attempting to move from a stable condition to a value above or below the previous stable condition in the shortest time possible.

This will assess the ability of the system to respond to a perturbation.
The "D" (derivative) in the PID algorithm is primarily responsible for minimizing the overshoot and oscillations in the response.

Reference: https://en.wikipedia.org/wiki/Step_response


1596812756786.png
 

Thread Starter

Kadav

Joined May 11, 2018
130
Step response means that you disturb the system with a step function, i.e. attempting to move from astable condition to a value above or below the previous stable condition in the shortest time possible.

This will assess the ability of the system to respond to a perturbation.
The "D" (derivative) in the PID algorithm is primarily responsible for minimizing the overshoot and oscillations in the response.

Reference: https://en.wikipedia.org/wiki/Step_response


View attachment 214207
so step response tuning operation , in a nutshell , how is it done ?
 

MrChips

Joined Oct 2, 2009
21,647
Step response tuning means exactly that.
You excite the system with a step function and measure and analyze the system's response to the step function.
You adjust P, I, and D parameters to minimize overshoot, oscillation, and settling time.
 

crutschow

Joined Mar 14, 2008
25,256
Note that however you enter the step impulse, just make sure it's connection doesn't affect the loop dynamics or response of the feedback loop.
 
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