jens
2b13bfb6c7
- reset between at oven state changes - PID: Y_max is 500 git-svn-id: http://moon:8086/svn/projects/HendiControl@235 fda53097-d464-4ada-af97-ba876c37ca34
67 lines
1.2 KiB
Python
67 lines
1.2 KiB
Python
import numpy as np;
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class Pid():
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def __init__(self):
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# Integrator
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self.yi = 0
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# Differentiator
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self.xd = 0
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# Auto windup
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self.y_min = 0.0
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self.y_max = 500.0
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self.diff_aw = 0.0
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# Output
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self.y = 0
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self.yc = 0
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@staticmethod
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def params(kp, ki, kd, rho):
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p = dict(kp=kp, ki=ki, kd=kd, rho=rho)
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return p
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def reset(self):
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self.yi = 0
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self.xd = 0
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def process(self, dt, params, err, derr=None):
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kp = params['kp']
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ki = params['ki']
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kd = params['kd']
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rho = params['rho']
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err_aw = err + self.diff_aw
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yi = rho*self.yi + err_aw
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if derr:
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yd = derr
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else:
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yd = err - self.xd
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_yp = kp * err
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_yi = ki*dt * yi
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_yd = kd/dt * yd
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self.y = _yp + _yi + _yd
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yaw = yi
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if yaw < self.y_min:
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self.diff_aw = abs(yaw - self.y_min)
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if yaw > self.y_max:
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self.diff_aw = -abs(yaw - self.y_max)
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self.yc = max(self.y_min, min(self.y_max, self.y))
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self.yi = yi
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self.xd = err
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def get_y(self):
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return self.y
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def get_yc(self):
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return self.yc
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