On-Off Control (alternative to PID)

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Presentation transcript:

On-Off Control (alternative to PID) Course PEF3006 Process Control Fall 2018 On-Off Control (alternative to PID) By Finn Aakre Haugen (finn.haugen@usn.no)

On-off controller function: 2 On-off controller function: u = umax when e >= 0. u = umin when e < 0. I think that the On-off controller is the simplest error-based (or: feedback-based) controller that exists. PEF3006 Process Control. USN. F. Haugen. 2018

On-off controller with dead-zone: 3 On-off controller with dead-zone: De is the dead-band. Purpose is to avoid control signal changes caused by measurement noise. PEF3006 Process Control. USN. F. Haugen. 2018

Comparison with P-controller: 4 Comparison with P-controller: P-controller: u = Kp*e + u0 Kp u0 On-off controller PEF3006 Process Control. USN. F. Haugen. 2018

Example: Temperature control of liquid tank PEF3006 Process Control. USN. F. Haugen. 2018

PEF3006 Process Control. USN. F. Haugen. 2018 Simulated responses: Process variable (temperature) varies around the setpoint, which is fine. But is the average control error zero (as we normally would like to obtain)? Process variable (temperature) oscillates! On-off pattern of control signal can cause problems with mechanical actuators, but not with electrical actuators. PEF3006 Process Control. USN. F. Haugen. 2018