PolyCraft/kiln-controller
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge pull request #29 from adq/windupmod

Browse Source 
tweak windup so it isn't temperature dependant
This commit is contained in:
Jason Bruce 2021-06-04 14:02:25 -04:00 committed by GitHub
commit f02ccdd86e
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 24 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
config.py
View File

@ -57,7 +57,7 @@ sensor_time_wait = 2
# These parameters work well with the simulated oven. You must tune them
# to work well with your specific kiln. Note that the integral pid_ki is
# inverted so that a smaller number means more integral action.
pid_kp = 25 # Proportional
pid_kp = 25 # Proportional
pid_ki = 200 # Integral
pid_kd = 200 # Derivative
@ -66,14 +66,12 @@ pid_kd = 200 # Derivative
#
# Initial heating and Integral Windup
#
# During initial heating, if the temperature is constantly under the
# During initial heating, if the temperature is constantly under the
# setpoint,large amounts of Integral can accumulate. This accumulation
# causes the kiln to run above the setpoint for potentially a long
# period of time. These settings allow integral accumulation only when
# the temperature is within stop_integral_windup_margin percent below
# or above the setpoint. This applies only to the integral.
# the temperature is close to the setpoint. This applies only to the integral.
stop_integral_windup = True
stop_integral_windup_margin = 10
########################################################################
#
@ -96,20 +94,20 @@ sim_R_ho_air = 0.05 # K/W " with internal air circulation
# If you change the temp_scale, all settings in this file are assumed to
# be in that scale.
temp_scale = "f" # c = Celsius | f = Fahrenheit - Unit to display
temp_scale = "f" # c = Celsius | f = Fahrenheit - Unit to display
time_scale_slope = "h" # s = Seconds | m = Minutes | h = Hours - Slope displayed in temp_scale per time_scale_slope
time_scale_profile = "m" # s = Seconds | m = Minutes | h = Hours - Enter and view target time in time_scale_profile
# emergency shutoff the profile if this temp is reached or exceeded.
# This just shuts off the profile. If your SSR is working, your kiln will
# naturally cool off. If your SSR has failed/shorted/closed circuit, this
# naturally cool off. If your SSR has failed/shorted/closed circuit, this
# means your kiln receives full power until your house burns down.
# this should not replace you watching your kiln or use of a kiln-sitter
emergency_shutoff_temp = 2264 #cone 7
emergency_shutoff_temp = 2264 #cone 7
# If the kiln cannot heat or cool fast enough and is off by more than
# If the kiln cannot heat or cool fast enough and is off by more than
# kiln_must_catch_up_max_error the entire schedule is shifted until
# the desired temperature is reached. If your kiln cannot attain the
# the desired temperature is reached. If your kiln cannot attain the
# wanted temperature, the schedule will run forever.
kiln_must_catch_up = True
kiln_must_catch_up_max_error = 10 #degrees

33
lib/oven.py
View File

@ -54,7 +54,7 @@ class Board(object):
self.active = True
log.info("import %s " % (self.name))
except ImportError:
msg = "max31855 config set, but import failed"
msg = "max31855 config set, but import failed"
log.warning(msg)
if config.max31856:
@ -64,7 +64,7 @@ class Board(object):
self.active = True
log.info("import %s " % (self.name))
except ImportError:
msg = "max31856 config set, but import failed"
msg = "max31856 config set, but import failed"
log.warning(msg)
def create_temp_sensor(self):
@ -76,7 +76,7 @@ class Board(object):
class BoardSimulated(object):
def __init__(self):
self.temp_sensor = TempSensorSimulated()
class TempSensor(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
@ -118,7 +118,7 @@ class TempSensorReal(TempSensor):
'''take 5 measurements over each time period and return the
average'''
while True:
maxtries = 5
maxtries = 5
sleeptime = self.time_step / float(maxtries)
temps = []
for x in range(0,maxtries):
@ -246,10 +246,10 @@ class SimulatedOven(Oven):
# set temps to the temp of the surrounding environment
self.t = self.t_env # deg C temp of oven
self.t_h = self.t_env #deg C temp of heating element
# call parent init
Oven.__init__(self)
# start thread
self.start()
log.info("SimulatedOven started")
@ -307,9 +307,9 @@ class SimulatedOven(Oven):
self.runtime,
self.totaltime,
time_left))
# we don't actually spend time heating & cooling during
# a simulation, so sleep.
# a simulation, so sleep.
time.sleep(self.time_step)
@ -397,7 +397,7 @@ class PID():
self.lastErr = 0
# FIX - this was using a really small window where the PID control
# takes effect from -1 to 1. I changed this to various numbers and
# takes effect from -1 to 1. I changed this to various numbers and
# settled on -50 to 50 and then divide by 50 at the end. This results
# in a larger PID control window and much more accurate control...
# instead of what used to be binary on/off control.
@ -411,12 +411,11 @@ class PID():
if self.ki > 0:
if config.stop_integral_windup == True:
margin = setpoint * config.stop_integral_windup_margin/100
if (abs(error) <= abs(margin)):
if abs(self.kp * error) < window_size:
self.iterm += (error * timeDelta * (1/self.ki))
else:
self.iterm += (error * timeDelta * (1/self.ki))
dErr = (error - self.lastErr) / timeDelta
output = self.kp * error + self.iterm + self.kd * dErr
out4logs = output
@ -430,14 +429,14 @@ class PID():
output = float(output / window_size)
if out4logs > 0:
if out4logs > 0:
# log.info("pid percents pid=%0.2f p=%0.2f i=%0.2f d=%0.2f" % (out4logs,
# ((self.kp * error)/out4logs)*100,
# ((self.kp * error)/out4logs)*100,
# (self.iterm/out4logs)*100,
# ((self.kd * dErr)/out4logs)*100))
# ((self.kd * dErr)/out4logs)*100))
log.info("pid actuals pid=%0.2f p=%0.2f i=%0.2f d=%0.2f" % (out4logs,
self.kp * error,
self.kp * error,
self.iterm,
self.kd * dErr))
self.kd * dErr))
return output