diff --git a/components/pid/pid.py b/components/pid/pid.py index d0905a2..a1c2774 100644 --- a/components/pid/pid.py +++ b/components/pid/pid.py @@ -3,6 +3,7 @@ class Pid: def __init__(self, params): self.params = params + self.k = 1.0 # Integrator self.yi = 0 @@ -18,6 +19,9 @@ class Pid: # Output self.y = 0 + def scale(self, k): + self.k = k + @staticmethod def params(kp, ki, kd, kt): p = dict(kp=kp, ki=ki, kd=kd, kt=kt) @@ -30,10 +34,10 @@ class Pid: def process(self, err): dt = self.params['dt'] - kp = self.params['kp'] - ki = self.params['ki'] - kd = self.params['kd'] - kt = self.params['kt'] + kp = self.params['kp'] * self.k + ki = self.params['ki'] * self.k + kd = self.params['kd'] * self.k + kt = self.params['kt'] * self.k self.yi = self.yi + ki*dt * err + kt*dt * self.awu yd = kd/dt*(err - self.err) diff --git a/components/pid/temp_controller.py b/components/pid/temp_controller.py index 60f9c09..a81087d 100644 --- a/components/pid/temp_controller.py +++ b/components/pid/temp_controller.py @@ -55,6 +55,10 @@ class TempController(AttributeChange): self.theta_ist = self.theta_ist_set self.heatrate_ist = self.heatrate_ist_set + # Compensate for max heat rate to reduce overshoot + if self.heatrate_soll_set > 0: + self.pid_hold.scale(1.0/self.heatrate_soll_set) + self.heatrate_soll = self.heatrate_soll_set * self.pid_hold.get_y() theta_err = self.theta_soll_set - self.theta_ist heatrate_err = self.heatrate_soll - self.heatrate_ist