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FAN: Kick start fan when the increase is more than 50% (#2085) 

Large increases in fan speed can suffer from acceleration lag, so this
change kick starts the fan for a change of 50% or more in the same way
that starting the fan from 0% does.

Signed-off-by: Justin Schuh <code@justinschuh.com>
This commit is contained in:
Justin Schuh 2019-11-24 18:37:30 -05:00 committed by KevinOConnor
parent 05472bb8a3
commit 93f1e6dd86
2 changed files with 5 additions and 4 deletions
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5
config/example.cfg
View File

@ -253,8 +253,9 @@ pin: ar9
# constrained by the implementation and may be significantly
# different than the requested cycle_time. The default is False.
#kick_start_time: 0.100
# Time (in seconds) to run the fan at full speed when first enabling
# it (helps get the fan spinning). The default is 0.100 seconds.
# Time (in seconds) to run the fan at full speed when either first
# enabling or increasing it by more than 50% (helps get the fan spinning).
# The default is 0.100 seconds.
#off_below: 0.0
# The minimum input speed which will power the fan (expressed as a
# value from 0.0 to 1.0). When a speed lower than off_below is

4
klippy/extras/fan.py
View File

@ -42,8 +42,8 @@ class PrinterFan:
if value == self.last_fan_value:
return
print_time = max(self.last_fan_time + FAN_MIN_TIME, print_time)
if (value and value < self.max_power
and not self.last_fan_value and self.kick_start_time):
if (value and value < self.max_power and self.kick_start_time
and (not self.last_fan_value or value - self.last_fan_value > .5)):
# Run fan at full speed for specified kick_start_time
self.mcu_fan.set_pwm(print_time, self.max_power)
print_time += self.kick_start_time