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<span>Thanks ! </span></div><div>
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<div style="font-size:12px;line-height:1.5;word-break:break-all;margin-left:10px;margin-right:10px">On <span class="mail-date">12/7/2021 16:05</span>，<a class="mail-to" style="text-decoration:none;color:#2a83f2;" href="mailto:a.kartashev@yadro.com">Andrei Kartashev<a.kartashev@yadro.com></a> wrote： </div>
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Sorry, I probably miss your question.<br><br>I still don't understand, what kind of help do you need, but I will try<br>to explain the idea:<br>PID-control daemon use concept of the PID systems, where you have<br>inputs (sensors) and outputs (FANs). To configure PIDs in pid-control<br>the zone concept is used: thermal zone can have several fans and<br>several sensors. <br>Then you should select PID-loop type and set parameters for each sensor<br>and FAN. For normal temperature sensor you generally will use normal<br>PID-loop, were you setup PID coefficients and setpoint (target<br>temperature). When the value of one (or more) sensor exceed setpoint<br>PID-control will increase the speed of the fans in the zone trying to<br>keep temperatures below the setpoints.<br>For current sensors you probably should use stepwise mode, but I'm not<br>familiar here.<br><br>On Tue, 2021-12-07 at 15:37 +0800, Landon wrote:<br> <blockquote class="mmbqc1"> <br> <br> On 12/7/2021 09:45，Landon<cld795@163.com> wrote： <br> <blockquote class="mmbqc2"><br> Hello,<br> Can you take a look at it, please?<br> <br> Thanks!<br> On 12/2/2021 17:11，Landon<cld795@163.com> wrote： <br> <blockquote class="mmbqc3">Hello,<br> <br> I read the<br> "https://github.com/openbmc/phosphor-pid-control/blob/master/configure.md"：<br> <br> How to Configure Phosphor-pid-control<br> <br> type == "temp"<br> <br> Exactly the same as margin but all the inputs are supposed to be<br> absolute temperatures and so the maximal value is used to feed<br> the PID loop.<br> type == "stepwise"<br> <br> "name": "temp1",<br> "type": "stepwise",<br> "inputs": ["temp1"],<br> "setpoint": 30.0,<br> "pid": {<br> "samplePeriod": 0.1,<br> "positiveHysteresis": 1.0,<br> "negativeHysteresis": 1.0,<br> "isCeiling": false,<br> "reading": {<br> "0": 45,<br> "1": 46,<br> "2": 47,<br> },<br> "output": {<br> "0": 5000,<br> "1": 2400,<br> "2": 2600,<br> }<br> }<br> and<br> in "https://github.com/openbmc/entity-manager/blob/master/configurations/R1000%20Chassis.json<br> "<br> {<br> "Class": "temp", "FFGainCoefficient": 0.0,<br> "FFOffCoefficient": 0.0, "ICoefficient": -4.64, <br> "ILimitMax": 100, "ILimitMin": 30, <br> "Inputs": [ "Exit Air Temp" ], <br> "Name": "Exit Air Temp", "NegativeHysteresis": 5.0, <br> "OutLimitMax": 100, "OutLimitMin": 30, <br> "Outputs": [], "PCoefficient": -0.15, <br> "PositiveHysteresis": 0.0, "SetPoint": 75.0, <br> "SlewNeg": -1, "SlewPos": 0.0, "Type":<br> "Pid", "Zones": [ "Zone 1", <br> "Zone 2", "Zone 3", "Zone 4", <br> "Zone 5", "Zone 6" ] },<br> but I don't understand how to control the fan by temperature ?<br> I was wondering if you could help me explain ?<br> Thank you very much !<br> On 11/29/2021 18:22，Andrei Kartashev<a.kartashev@yadro.com><br> wrote： <br> <blockquote class="mmbqc3">Hello,<br> <br> Please read phosphor-pid-control documentation:<br> https://github.com/openbmc/phosphor-pid-control<br> https://github.com/openbmc/phosphor-pid-<br> control/blob/master/configure.md<br> https://github.com/openbmc/phosphor-pid-<br> control/blob/master/tuning.md<br> https://github.com/openbmc/phosphor-pid-<br> control/tree/master/examples<br> <br> Keep in mind that there are two different ways to configure<br> phosphor-<br> pid-control: statically with JSON config files and dynamically<br> with<br> DBUS (generally, using EntityManager JSON configuration) and<br> same<br> parameters with this two ways mostly have different names.<br> The way you want to use is generally depend on either you use<br> EM<br> for<br> your platform or not.<br> <br> On Mon, 2021-11-29 at 17:43 +0800, Landon wrote:<br> <br> <blockquote class="mmbqc3"> Thank you! <br> I have read it<br> : https://github.com/openbmc/entity-<br> manager/blob/master/configurations/R1000%20Chassis.json<br> But I don't understand,<br> Is there an explanation for this part?<br> Are there general instructions on how to control fan output<br> by<br> temperature?<br> <br> and how to use phosphor-pid-control to set this ?<br> <br> Is there“ phosphor-pid-control ”the instructions for this<br> part?<br> Thank you very much !<br> On 11/27/2021 05:57，Paul Fertser<fercerpav@gmail.com> wrote：<br> <br> <blockquote class="mmbqc3">On Fri, Nov 26, 2021 at 01:55:31PM +0800, Landon wrote:<br> <br> <br> <blockquote class="mmbqc3">add: I just want to know in OpenBMC by reading different<br> temperature values or<br> current values to control the fan output, so as to<br> cool down,<br> how does this<br> strategy work? An example of this.<br> </blockquote><br> This is using temperature values to control the fans so as<br> to cool<br> down, it works by configuring phosphor-pid-control<br> appropriately, I<br> hope it's enough of an example:<br> <br> https://github.com/openbmc/entity-<br> manager/blob/master/configurations/R1000%20Chassis.json<br> <br> If you think phosphor-pid-control is missing some<br> documentation<br> please<br> read its source code and send documentation patches for<br> review.<br> <br> </blockquote></blockquote><br></blockquote></blockquote></blockquote></blockquote><br>-- <br>Best regards,<br>Andrei Kartashev<br><br></blockquote><!--😀-->
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