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APM_Control: added proportional reduction to D and P

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This commit is contained in:
Andrew Tridgell 2021-04-04 10:49:59 +10:00
parent d561cd358f
commit 772b1262d4
1 changed files with 16 additions and 5 deletions
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21
libraries/APM_Control/AP_AutoTune.cpp
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@ -309,9 +309,10 @@ void AP_AutoTune::update(AP_Logger::PID_Info &pinfo, float scaler)
bool PD_significant = (max_P > PD_high || max_D > PD_high);
// see if we overshot
bool overshot = (state == ATState::DEMAND_POS)?
(max_rate > max_target*AUTOTUNE_OVERSHOOT):
(min_rate < min_target*AUTOTUNE_OVERSHOOT);
const float dem_ratio = (state == ATState::DEMAND_POS)?
constrain_float(max_rate / max_target, 0.1, 2):
constrain_float(min_rate / min_target, 0.1, 2);
bool overshot = dem_ratio > AUTOTUNE_OVERSHOOT;
// adjust P and D
float D = rpid.kD();
@ -322,13 +323,23 @@ void AP_AutoTune::update(AP_Logger::PID_Info &pinfo, float scaler)
// if the slew limiter kicked in or
if (min_Dmod < 1.0 || (overshot && PD_significant)) {
// we apply a gain reduction in proportion to the overshoot and dmod
const float gain_mul = (100 - AUTOTUNE_DECREASE_PD_STEP)*0.01;
const float dmod_mul = linear_interpolate(1, gain_mul,
min_Dmod,
1.0, 0.6);
const float overshoot_mul = linear_interpolate(1, gain_mul,
dem_ratio,
AUTOTUNE_OVERSHOOT,
1.3 * AUTOTUNE_OVERSHOOT);
// we're overshooting or oscillating, decrease gains. We
// assume the gain that needs to be reduced is the one that
// peaked at a higher value
if (max_P < max_D) {
D *= (100 - AUTOTUNE_DECREASE_PD_STEP)*0.01;
D *= dmod_mul * overshoot_mul;
} else {
P *= (100 - AUTOTUNE_DECREASE_PD_STEP)*0.01;
P *= dmod_mul * overshoot_mul;
}
action = Action::LOWER_PD;
} else {