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SMBus battery (a.k.a. smart battery) enhancement. (#14496)

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* Enhancement: State of health, and max_error value is added. Both shows battery health of SMBUS smart battery.
 * Enhancement: BAT_C_MULT parameter is introduced. This is for high-current capable SMBUS-based battery.
As SMBUS only provides 16-bit for current, it could only be +-32768mA which is about +-32A.
But with proper treatment, it could be extended with little accuracy loss.
This factor can be set for individual battery system with available information.
    * Relative SOC introduced. Proper SMBUS battery should provide percentage of remaining battery
directly. Therefore it does not have to be computed like before.
    * State of Health introduced. Proper SMBUS battery should provide SOH value.
    * Max error: this shows estimation error of BMS.
 * Enhancement: With smart battery, precise estimation of time remaining is provided
with impedance track. It is unit of minute, so 60 seconds multiplied.
Update rate of this is not fast, but very useful.

Co-authored-by: Hyon Lim <lim@uvify.com>
This commit is contained in:
Hyon Lim
2020-04-01 06:28:22 +09:00
committed by GitHub
parent 39b47e63b5
commit 3bcd8c63f8
5 changed files with 51 additions and 17 deletions
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src/modules/mavlink/mavlink_messages.cpp
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@@ -708,6 +708,7 @@ protected:
bat_msg.energy_consumed = -1;
bat_msg.current_battery = (battery_status.connected) ? battery_status.current_filtered_a * 100 : -1;
bat_msg.battery_remaining = (battery_status.connected) ? ceilf(battery_status.remaining * 100.0f) : -1;
bat_msg.time_remaining = (battery_status.connected) ? battery_status.run_time_to_empty * 60 : 0;
switch (battery_status.warning) {
case (battery_status_s::BATTERY_WARNING_NONE):