Hi everyone,

&nb= sp; For the parameters of the following table, does the = PID code of openbmc have a clearer transfer function corresponding to this table? By adjusting the following parameters, fancontrol has taken= effect. I set 5000 rpm, but the fan will change back and forth between 450= 0-5500. The change in this range is still relatively large. If there is a t= ransfer function, the adjustment will be more accurate and faster.

https://github.com/openbmc/phosphor-pid-control/blob= /master/configure.md

openbmc/phosphor-pid-control

OpenBMC PID-based Thermal Control Daemon. Contribute to openbmc/phosphor-pi= d-control development by creating an account on GitHub.

github.com

field	type	meaning
`samplePeriod`	`double`	How frequently the value is sampled. 0.1 for fans, 1.0 for temperatures.
`proportionalCoef= f`	`double`	The proportional coefficient.
`integralCoeff`	`double`	The integral coefficient.
`feedFwdOffsetCoe= ff`	`double`	The feed forward offset coefficient.
`feedFwdGainCoeff=`	`double`	The feed forward gain coefficient.
`integralLimit_mi= n`	`double`	The integral minimum clamp value.
`integralLimit_ma= x`	`double`	The integral maximum clamp value.
`outLim_min`	`double`	The output minimum clamp value.
`outLim_max`	`double`	The output maximum clamp value.
`slewNeg`	`double`	Negative slew value to dampen output.
`slewPos`	`double`	Positive slew value to accelerate output.

=B7=A2=BC=FE=C8=CB: =D6=DC = =D4=B6=C7=E5 <zhouyuanqing8@outlook.com>
=B7=A2=CB=CD=CA=B1=BC=E4: 2020=C4=EA9=D4=C227=C8=D5 11:17
=CA=D5=BC=FE=C8=CB: openbmc <openbmc@lists.ozlabs.org>
=B3=AD=CB=CD: uperic@163.com <uperic@163.com>
=D6=F7=CC=E2: about pid speed control

Hi everyone,

I added the phophor-pid-control module to my project. Af= ter the PID module was started, the pwm value oscillated between 12 and 153= . I deleted other configurations and only kept one fan and one temp. I have= debugged various PID parameter values of fan, and there is no obvious change in the phenomenon. Please take a look at it= , thank you.

The confi= guration is as follows: <= /span>

4611 root 7616 S /usr/bin/swa= mpd -t -l /tmp/

root@starlake-sn:~# cat /etc/thermal.d/setpoint

3000

config.json as follow:

{

"sensors" : [

{

"name": "Fan0= _Speed",

"type": "fan&= quot;,

"readPath": "= /xyz/openbmc_project/sensors/fan_tach/Fan0_Speed",

"writePath": "= ;/xyz/openbmc_project/sensors/fan_tach/Fan0_Speed",

"min": 0,

"max": 255,

"timeout": 0

{

"name": "inle= t_Temp",

"type": "temp= ",

"readPath": "= /xyz/openbmc_project/sensors/temperature/inlet_Temp",

"writePath": "= ;",

"min": 0,

"max": 0,

"ignoreDbusMinMax"= : true,

"timeout": 0

}

"zones" : [

{

"id": 1,

"minThermalOutput"= : 3000.0,

"failsafePercent":= 75.0,

"pids": [

{

= "name": "Fan0_Speed",

= "type": "fan",

= "inputs": ["Fan0_Speed"],

= "setpoint": 50.0,

= "pid": {

= "samplePeriod": 0.1,

= "proportionalCoeff": 20.0,

= "integralCoeff": 0.1,

= "feedFwdOffsetCoeff": 0.0,

= "feedFwdGainCoeff": 1.0,

= "integralLimit_min": 0.0,

= "integralLimit_max": 5.0,

= "outLim_min": 5.0,

= "outLim_max": 60.0,

= "slewNeg": 0.0,

= "slewPos": 0.0

= }

{

= "name": "inlet_Temp",

= "type": "temp",

= "inputs": ["inlet_Temp"],

= "setpoint": 50.0,

= "pid": { = amplePeriod": 0.1,

= "samplePeriod": 1.0,

= "proportionalCoeff": -0.1,

= "integralCoeff": 1.0, 36;34Hin":= 5.0,

= "feedFwdOffsetCoeff": 0.0,

= "feedFwdGainCoeff": 0.0,

= "integralLimit_min": 0.0,

= "integralLimit_max": 0.0,

= "outLim_min": 3000.0,

= "outLim_max": 16000.0,

= "slewNeg": 0.0,

= "slewPos": 0.0,

= "positiveHysteresis": 1.0,

= "negativeHysteresis": 1.0

}

]

}

]

}

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