PID PROBLEM IN CONTROLLER STM 32

[deepak]

Posted on August 21, 2014 at 10:02

Hi,

i am facing problem for the PiD controller.what parameter i have to use it for the positive & negative nos for calculation purpose.Kindly look following code New_Duty_cycle_buck=(Previous_Duty_cycle_buck + Error_Duty_cycle_buck);where ''Error_Duty_cycle_buck'' can be positive or negative.it is for the updating a new duty cycle.in declaration part,double Error_Duty_cycle_buck=0;i declare like this.but my pid loop not working correctly.pls helpLook forward to hearing you soon. #stm32f4 #discovery

[frankmeyer9]

Posted on August 21, 2014 at 16:50

New_Duty_cycle_buck=(Previous_Duty_cycle_buck + Error_Duty_cycle_buck);

That is more of a P controller algorithm with kP=1, and not PID....but my pid loop not working correctly. Hard to judge, you did not present any 'pid loop' code.

[Tesla DeLorean]

Posted on August 21, 2014 at 18:54

Not very good at explaining problems. [DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Problem%20in%20duty%20cycle&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=38]https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2Fcortex_mx_stm32%2FProblem%20in%20duty%20cycle&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B¤tviews=38

Do the math, print out the results to the console, and also try with PC based C code emulating the loop and the values you expect to read. Once you have modeled it correctly apply it to hardware, and the value read there.