Difference between revisions of "Phidgets PID"
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== Other PID References == | == Other PID References == | ||
− | * [https://en.m.wikipedia.org/wiki/PID_controller PID Controller] Theory | + | * [https://en.m.wikipedia.org/wiki/PID_controller PID Controller] Theory from Wikipedia |
* [http://www.seattlerobotics.org/encoder/200108/using_a_pid.html Using PID based Techniques For Competitive Odometry and Dead-Reckoning] G.W. Lucas | * [http://www.seattlerobotics.org/encoder/200108/using_a_pid.html Using PID based Techniques For Competitive Odometry and Dead-Reckoning] G.W. Lucas |
Revision as of 12:49, 20 September 2017
References
PID Calibration
- ROS PID Tuning
- A quick and dirty tuning experiment
- Target linear speed 0.2 m/sec, angular 0.2 radians/sec
- Definite oscillation with P = 60.
- Set P to 1/2 of that or 30
- Tried a I of 60
- See Phidgets PID Tuning
- A quick and dirty tuning experiment
"If the system must remain online, one tuning method is to first set K_i and K_d values to zero. Increase the K_p until the output of the loop oscillates, then the K_p should be set to approximately half of that value for a "quarter amplitude decay" type response. Then increase K_i until any offset is corrected in sufficient time for the process. However, too much K_i will cause instability. Finally, increase K_d, if required, until the loop is acceptably quick to reach its reference after a load disturbance. However, too much K_d will cause excessive response and overshoot. A fast PID loop tuning usually overshoots slightly to reach the setpoint more quickly; however, some systems cannot accept overshoot, in which case an over-damped closed-loop system is required, which will require a K_p setting significantly less than half that of the K_p setting that was causing oscillation."
Other PID References
- PID Controller Theory from Wikipedia
- Using PID based Techniques For Competitive Odometry and Dead-Reckoning G.W. Lucas