[External] Re: Questions regarding of phosphor-pid-control

Derek Lin23 dlin23 at lenovo.com
Thu Jul 18 12:40:26 AEST 2019

Hi Patrick:

          The open-loop in this context is more likely to set duty of PWM manually.
          For example, when reading a sensor above or below a certain pre-defined temperature, then the duty of a PWM is revved up or lower to the desired fan-speed.
          More likely, PWM is set simply by the reading of a temperature sensor. A map of temperature readings and PWM values can be represented as an example.

Thank you,

From: Patrick Venture <venture at google.com>
Sent: Tuesday, July 16, 2019 1:02 AM
To: Derek Lin23 <dlin23 at lenovo.com>; James Feist <james.feist at linux.intel.com>
Cc: Yonghui YH21 Liu <liuyh21 at lenovo.com>; Harry Sung1 <hsung1 at lenovo.com>; OpenBMC Maillist <openbmc at lists.ozlabs.org>
Subject: [External] Re: Questions regarding of phosphor-pid-control

On Tue, Jul 9, 2019 at 2:03 AM Derek Lin23 <dlin23 at lenovo.com<mailto:dlin23 at lenovo.com>> wrote:
Hi Patrick:

Adding the openbmc mailing list.  Please always include this mailing list in your emails for archiving and later reference as well as opening up the question to others.

Also adding James Feist as he co-maintains this codebase.

          This is Derek from Lenovo BMC team.
          We have some questions regarding of phosphos-pid-control<https://github.com/openbmc/phosphor-pid-control>, and we hope you can provide some advice of the component.

          Currently, we would like to import phosphor-pid-control as our thermal fan control module. After a brief study, we would like to know if phosphor-pid-control can support open-loop and event-triggered events?

I don't really know what open-loop means in this context.  Registering for events, like?

Thank you for your feedbacks,


Derek Lin
Sr. BMC Engineer
8F,66, San Chong Rd., Nankang Software Park, Taipei.
Lenovo Taiwan

[Email]dlin23 at lenovo.com<mailto:dlin23 at lenovo.com>

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