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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Hi everyone,</span><br>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"> 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 4500-5500. The change in this range is still relatively large. If there is a transfer function, the adjustment
will be more accurate and faster.</span></div>
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<a href="https://github.com/openbmc/phosphor-pid-control/blob/master/configure.md" id="LPlnk">https://github.com/openbmc/phosphor-pid-control/blob/master/configure.md</a><br>
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<a target="_blank" id="LPUrlAnchor771081" href="https://github.com/openbmc/phosphor-pid-control/blob/master/configure.md" style="text-decoration: none; color: var(--themePrimary);">openbmc/phosphor-pid-control</a></div>
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OpenBMC PID-based Thermal Control Daemon. Contribute to openbmc/phosphor-pid-control development by creating an account on GitHub.</div>
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github.com</div>
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field</th>
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type</th>
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meaning</th>
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<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">samplePeriod</code></td>
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<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
How frequently the value is sampled. 0.1 for fans, 1.0 for temperatures.</td>
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<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">proportionalCoeff</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
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The proportional coefficient.</td>
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<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">integralCoeff</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
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The integral coefficient.</td>
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<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">feedFwdOffsetCoeff</code></td>
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<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
The feed forward offset coefficient.</td>
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<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">feedFwdGainCoeff</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
The feed forward gain coefficient.</td>
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<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">integralLimit_min</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
The integral minimum clamp value.</td>
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<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">integralLimit_max</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
The integral maximum clamp value.</td>
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<tr style="box-sizing: border-box; background-color: rgb(246, 248, 250); border-top-width: 1px; border-top-style: solid; border-top-color: rgb(198, 203, 209)">
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">outLim_min</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
The output minimum clamp value.</td>
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<tr style="box-sizing: border-box; background-color: rgb(255, 255, 255); border-top-width: 1px; border-top-style: solid; border-top-color: rgb(198, 203, 209)">
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">outLim_max</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
The output maximum clamp value.</td>
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<tr style="box-sizing: border-box; background-color: rgb(246, 248, 250); border-top-width: 1px; border-top-style: solid; border-top-color: rgb(198, 203, 209)">
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">slewNeg</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
Negative slew value to dampen output.</td>
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<tr style="box-sizing: border-box; background-color: rgb(255, 255, 255); border-top-width: 1px; border-top-style: solid; border-top-color: rgb(198, 203, 209)">
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">slewPos</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
<code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace; font-size: 13.600000381469727px; padding: 0.2em 0.4em; margin: 0px; background-color: rgba(27, 31, 35, 0.05); border-top-left-radius: 6px; border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-bottom-left-radius: 6px">double</code></td>
<td style="box-sizing: border-box; padding: 6px 13px; border: 1px solid rgb(223, 226, 229)">
Positive slew value to accelerate output.</td>
</tr>
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</table>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>发件人:</b> 周 远清 <zhouyuanqing8@outlook.com><br>
<b>发送时间:</b> 2020年9月27日 11:17<br>
<b>收件人:</b> openbmc <openbmc@lists.ozlabs.org><br>
<b>抄送:</b> uperic@163.com <uperic@163.com><br>
<b>主题:</b> about pid speed control</font>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Hi everyone,</div>
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I added the phophor-pid-control module to my project. After 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.</div>
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<span style="color:rgb(81,167,249)"> </span><span style="color:rgb(81,167,249)"> </span><span style="color:rgb(81,167,249)">The configuration is as follows</span><span style="color:rgb(81,167,249)">: </span></div>
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4611 root 7616 S /usr/bin/swampd -t -l /tmp/<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
root@starlake-sn:~# cat /etc/thermal.d/setpoint</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
3000</div>
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<br>
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<span style="color:rgb(81,167,249)"> </span><span style="color:rgb(81,167,249)"> config.json as follow:</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
{
<div> "sensors" : [</div>
<div> {</div>
<div> "name": "Fan0_Speed",</div>
<div> "type": "fan",</div>
<div> "readPath": "/xyz/openbmc_project/sensors/fan_tach/Fan0_Speed",
</div>
<div> "writePath": "/xyz/openbmc_project/sensors/fan_tach/Fan0_Speed", </div>
<div> "min": 0,</div>
<div> "max": 255,</div>
<div> "timeout": 0</div>
<div> },</div>
<div> {</div>
<div> "name": "inlet_Temp",</div>
<div> "type": "temp",</div>
<div> "readPath": "/xyz/openbmc_project/sensors/temperature/inlet_Temp",</div>
<div> "writePath": "",</div>
<div> "min": 0,</div>
<div> "max": 0,</div>
<div> "ignoreDbusMinMax": true,</div>
<div> "timeout": 0</div>
<div> }</div>
],</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
"zones" : [
<div> {</div>
<div> "id": 1,</div>
<div> "minThermalOutput": 3000.0,</div>
<div> "failsafePercent": 75.0,</div>
<div> "pids": [</div>
<div> {</div>
<div> "name": "Fan0_Speed",</div>
<div> "type": "fan",</div>
<div> "inputs": ["Fan0_Speed"],</div>
<div> "setpoint": 50.0,</div>
<div> "pid": {</div>
<div> "samplePeriod": 0.1,</div>
<div> "proportionalCoeff": 20.0,</div>
<div> "integralCoeff": 0.1, </div>
<div> "feedFwdOffsetCoeff": 0.0,</div>
<div> "feedFwdGainCoeff": 1.0, </div>
<div> "integralLimit_min": 0.0, </div>
<div> "integralLimit_max": 5.0, </div>
<div> "outLim_min": 5.0, </div>
<div> "outLim_max": 60.0, </div>
<div> "slewNeg": 0.0,</div>
<div> "slewPos": 0.0</div>
<div> }</div>
<div> },</div>
<div> {</div>
<div> "name": "inlet_Temp",</div>
<div> "type": "temp",</div>
<div> "inputs": ["inlet_Temp"], </div>
<div> "setpoint": 50.0,</div>
<div> "pid": { amplePeriod": 0.1, </div>
<div> "samplePeriod": 1.0, </div>
<div> "proportionalCoeff": -0.1,</div>
<div> "integralCoeff": 1.0, 36;34Hin": 5.0,</div>
<div> "feedFwdOffsetCoeff": 0.0,</div>
<div> "feedFwdGainCoeff": 0.0, </div>
<div> "integralLimit_min": 0.0, </div>
<div> "integralLimit_max": 0.0, </div>
<div> "outLim_min": 3000.0, </div>
<div> "outLim_max": 16000.0, </div>
<div> "slewNeg": 0.0,</div>
<div> "slewPos": 0.0,</div>
<div> "positiveHysteresis": 1.0,</div>
<div> "negativeHysteresis": 1.0 </div>
}<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
}
<div> ]</div>
<div> }</div>
<div> ]</div>
}<br>
</div>
</div>
</div>
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