• State
  • Locked Locked
  • Replies 8 replies
  • Subscribers 63 subscribers
  • Views 432 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

BQ27426: Methods for keeping filtered FCC and Unfiltered FCC values fixed

BQ27426: When FCC re-simulates, does RM re-simulate as well?

Wang Dong
Intellectual 600 points
Part Number: BQ27426

Tool/software:

Hi there！

查看FuelgaugeIC的应用指导，里面描述了FCC的更新机制。

Check the application guide for FuelgaugeIC, which describes the FCC update mechanism.

True FCC update mechanism：

(8). RM, FCC re-simulation update when Reset is reset.
(9). Whenever Qmax is updated RM, FCC re-simulation is updated. The Qmax update typically occurs when the OCV voltage is sufficiently stable (dV / dt < 4 µV/s) or when it has been sitting for more than 5 hours.
(10). Whenever Ra is updated RM, the FCC re-simulates the update. The Ra update occurs at 15 impedance grid points during the discharge process.
(11). RM, the FCC resimulates the update every time Relax Mode is exited (i.e., when charging begins, or when discharging begins).
(12). RM, FCC re-simulation update whenever charge full cut-off occurs.
(13). RM, FCC resimulation update every 5 hours during standby.
(14). RM, FCC resimulation update every time the temperature changes to Delta T 5°C.

根据描述，我的理解是：True FCC重新仿真时，RM也会重新仿真。

这个理解是否正确？

Based on the description, my understanding is that when True FCC re-simulates, RM will also re-simulate.

Is this understanding correct?

  • 0
    TI__Guru 62006 points

    This is correct. It's actually the other way round, RM sims will update FCC but that's just a technicality.

  • 0 in reply to Dominik Hartl11
    Intellectual 600 points

    Thanks for you reply！

    The FCC update mechanism is described in the above question.

    Are there any other scenarios or conditions, other than the few mentioned above, that would lead to FCC, RM re-simulation?

    上述问题中描述了FCC的更新机制。

    除了上述的几个以外，是否还有其它场景或条件，会导致FCC、RM重新仿真？

  • 0 in reply to Wang Dong
    Intellectual 600 points

    Please help reply to the above question, thank you very much!

  • 0 in reply to Wang Dong
    TI__Guru 62006 points

    Please see your two threads about this gauge on E2E.

  • 0 in reply to Dominik Hartl11
    Intellectual 600 points

    Hello dominik,

    In the other two threads, it mainly describes that temperature and current will cause FCC and RM to re-simulate.

    My understanding is: The original problem's FCC update condition is already all the conditions for FCC and RM to re-simulate.

    Is my understanding correct?

    其它两个threads中，主要描述了温度和电流会使FCC、RM重新仿真。

    我的理解是：原始问题中的FCC更新条件已经是全部的FCC、RM重新仿真条件。

    理解是否正确？

  • 0 in reply to Wang Dong
    TI__Guru 62006 points

    Yes, this is correct.

  • 0 in reply to Dominik Hartl11
    Intellectual 600 points

    Hi Dominik，

    下述FCC更新条件分别满足后，RM和FCC的变化比例都不是等比例的吗？

    Are the changes in RM and FCC after meeting the updated conditions of FCC unequal proportions?

    (8). RM, FCC re-simulation update when Reset is reset.
    (9). Whenever Qmax is updated RM, FCC re-simulation is updated. The Qmax update typically occurs when the OCV voltage is sufficiently stable (dV / dt < 4 µV/s) or when it has been sitting for more than 5 hours.
    (10). Whenever Ra is updated RM, the FCC re-simulates the update. The Ra update occurs at 15 impedance grid points during the discharge process.
    (11). RM, the FCC resimulates the update every time Relax Mode is exited (i.e., when charging begins, or when discharging begins).
    (12). RM, FCC re-simulation update whenever charge full cut-off occurs.
    (13). RM, FCC resimulation update every 5 hours during standby.
    (14). RM, FCC resimulation update every time the temperature changes to Delta T 5°C.

  • 0 in reply to Wang Dong
    TI__Guru 62006 points

    FCC = InitialCapacity + RM (in most cases).

    InitialCapacity = QStart (in most cases)

    QStart = (PresentDOD-DODatEOC) * Qmax.

    Therefore FCC usually doesn't change proportionally in the sense of RM/FCC = constant.