+ Post New Thread
Results 1 to 3 of 3
  1. #1
    Newbie level 2
    Points: 37, Level: 1

    Join Date
    May 2019
    Posts
    3
    Helped
    0 / 0
    Points
    37
    Level
    1

    Deadband and Hysteresis values from graphs

    Hello,

    So I was learning about on-off control and three position control, and I found some tasks about values of deadband and hysteresis that I simply cannot understand, and see exactly what is going on. I would like if someone can explain which points should I look at. The exact task is what are the values of B (deadband) and H (hysteresis).

    Click image for larger version. 

Name:	ac4.PNG 
Views:	12 
Size:	112.5 KB 
ID:	153483

    Click image for larger version. 

Name:	ac3.PNG 
Views:	10 
Size:	112.4 KB 
ID:	153482

    Click image for larger version. 

Name:	ac1.PNG 
Views:	11 
Size:	117.9 KB 
ID:	153481

    •   AltAdvertisement

        
       

  2. #2
    Advanced Member level 4
    Points: 6,247, Level: 18
    kripacharya's Avatar
    Join Date
    Dec 2012
    Location
    New Delhi
    Posts
    1,209
    Helped
    182 / 182
    Points
    6,247
    Level
    18

    Re: Deadband and Hysteresis values from graphs

    Deadband is that set of input values where no action is taken one way or another.

    Hysteresis is when one 'trip point' causes another 'trip point' to be changed so that it is in opposition to the signal movement.



    •   AltAdvertisement

        
       

  3. #3
    Super Moderator
    Points: 29,540, Level: 41
    andre_teprom's Avatar
    Join Date
    Nov 2006
    Location
    Brazil
    Posts
    8,813
    Helped
    1114 / 1114
    Points
    29,540
    Level
    41
    Blog Entries
    9

    Re: Deadband and Hysteresis values from graphs

    Quote Originally Posted by Uros11 View Post
    The exact task is what are the values of B (deadband) and H (hysteresis)
    The above 3 graphics are on different scales, so in order to make things easiest to understand I put everything on the same grid.

    For the first case there is neither deadzone nor hysteresis, there is only an on-off control, whereas in the other graphs, there is respectively a deadband of ~1.7 at the 2nd graph, and a hysteresis/deadband of ~ 0.25/0,5 at the 3rd graph:

    Click image for larger version. 

Name:	graph.png 
Views:	2 
Size:	185.6 KB 
ID:	154396

    There is a range of input values for which no control is made, which is marked as yellow, whereas either the values marked as green and as red are both the negative feedback control which attempt to turn output back to the desired setpoint.

    Here, there is a view of how control signal reacts to each range of the input, with actual values, according to the above picture:

    Click image for larger version. 

Name:	InpuOutput.png 
Views:	1 
Size:	10.7 KB 
ID:	154395
    --------------------------------------------------------------------------------------------------
    Part of the world that you live in, You are the part that you're giving ( Renaissance )



--[[ ]]--