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🚩 MPC update (#24253)

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tombrazier 2022-05-28 23:40:08 +01:00 committed by Scott Lahteine
parent 9799907dc9
commit fc1a620b87
6 changed files with 23 additions and 14 deletions
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6
Marlin/Configuration.h
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@ -646,15 +646,15 @@
//#define MPC_FAN_0_ACTIVE_HOTEND
#endif
#define FILAMENT_HEAT_CAPACITY_PERMM 5.6e-3f // 0.0056 J/K/mm for 1.75mm PLA (0.0149 J/K/mm for 2.85mm PLA).
//#define FILAMENT_HEAT_CAPACITY_PERMM 3.6e-3f // 0.0036 J/K/mm for 1.75mm PETG (0.0094 J/K/mm for 2.85mm PETG).
#define FILAMENT_HEAT_CAPACITY_PERMM { 5.6e-3f } // 0.0056 J/K/mm for 1.75mm PLA (0.0149 J/K/mm for 2.85mm PLA).
//#define FILAMENT_HEAT_CAPACITY_PERMM { 3.6e-3f } // 0.0036 J/K/mm for 1.75mm PETG (0.0094 J/K/mm for 2.85mm PETG).
// Advanced options
#define MPC_SMOOTHING_FACTOR 0.5f // (0.0...1.0) Noisy temperature sensors may need a lower value for stabilization.
#define MPC_MIN_AMBIENT_CHANGE 1.0f // (K/s) Modeled ambient temperature rate of change, when correcting model inaccuracies.
#define MPC_STEADYSTATE 0.5f // (K/s) Temperature change rate for steady state logic to be enforced.
#define MPC_TUNING_POS { X_CENTER, Y_CENTER, 1.0f } // (mm) M306 Autotuning position, ideally bed center just above the surface.
#define MPC_TUNING_POS { X_CENTER, Y_CENTER, 1.0f } // (mm) M306 Autotuning position, ideally bed center at first layer height.
#define MPC_TUNING_END_Z 10.0f // (mm) M306 Autotuning final Z position.
#endif

8
Marlin/src/gcode/temp/M306.cpp
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@ -36,6 +36,7 @@
* C<joules/kelvin> Block heat capacity.
* E<extruder> Extruder number to set. (Default: E0)
* F<watts/kelvin> Ambient heat transfer coefficient (fan on full).
* H<joules/kelvin/mm> Filament heat capacity per mm.
* P<watts> Heater power.
* R<kelvin/second/kelvin> Sensor responsiveness (= transfer coefficient / heat capcity).
*/
@ -43,7 +44,7 @@
void GcodeSuite::M306() {
if (parser.seen_test('T')) { thermalManager.MPC_autotune(); return; }
if (parser.seen("ACFPR")) {
if (parser.seen("ACFPRH")) {
const heater_id_t hid = (heater_id_t)parser.intval('E', 0);
MPC_t &constants = thermalManager.temp_hotend[hid].constants;
if (parser.seenval('P')) constants.heater_power = parser.value_float();
@ -53,6 +54,7 @@ void GcodeSuite::M306() {
#if ENABLED(MPC_INCLUDE_FAN)
if (parser.seenval('F')) constants.fan255_adjustment = parser.value_float() - constants.ambient_xfer_coeff_fan0;
#endif
if (parser.seenval('H')) constants.filament_heat_capacity_permm = parser.value_float();
return;
}
@ -70,8 +72,10 @@ void GcodeSuite::M306_report(const bool forReplay/*=true*/) {
SERIAL_ECHOPAIR_F(" R", constants.sensor_responsiveness, 4);
SERIAL_ECHOPAIR_F(" A", constants.ambient_xfer_coeff_fan0, 4);
#if ENABLED(MPC_INCLUDE_FAN)
SERIAL_ECHOLNPAIR_F(" F", constants.ambient_xfer_coeff_fan0 + constants.fan255_adjustment, 4);
SERIAL_ECHOPAIR_F(" F", constants.ambient_xfer_coeff_fan0 + constants.fan255_adjustment, 4);
#endif
SERIAL_ECHOPAIR_F(" M", constants.filament_heat_capacity_permm, 4);
SERIAL_EOL();
}
}

3
Marlin/src/module/settings.cpp
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@ -3266,6 +3266,7 @@ void MarlinSettings::reset() {
#if ENABLED(MPC_INCLUDE_FAN)
constexpr float _mpc_ambient_xfer_coeff_fan255[] = MPC_AMBIENT_XFER_COEFF_FAN255;
#endif
constexpr float _filament_heat_capacity_permm[] = FILAMENT_HEAT_CAPACITY_PERMM;
static_assert(COUNT(_mpc_heater_power) == HOTENDS, "MPC_HEATER_POWER must have HOTENDS items.");
static_assert(COUNT(_mpc_block_heat_capacity) == HOTENDS, "MPC_BLOCK_HEAT_CAPACITY must have HOTENDS items.");
@ -3274,6 +3275,7 @@ void MarlinSettings::reset() {
#if ENABLED(MPC_INCLUDE_FAN)
static_assert(COUNT(_mpc_ambient_xfer_coeff_fan255) == HOTENDS, "MPC_AMBIENT_XFER_COEFF_FAN255 must have HOTENDS items.");
#endif
static_assert(COUNT(_filament_heat_capacity_permm) == HOTENDS, "FILAMENT_HEAT_CAPACITY_PERMM must have HOTENDS items.");
HOTEND_LOOP() {
thermalManager.temp_hotend[e].constants.heater_power = _mpc_heater_power[e];
@ -3283,6 +3285,7 @@ void MarlinSettings::reset() {
#if ENABLED(MPC_INCLUDE_FAN)
thermalManager.temp_hotend[e].constants.fan255_adjustment = _mpc_ambient_xfer_coeff_fan255[e] - _mpc_ambient_xfer_coeff[e];
#endif
thermalManager.temp_hotend[e].constants.filament_heat_capacity_permm = _filament_heat_capacity_permm[e];
}
#endif

6
Marlin/src/module/temperature.cpp
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@ -998,7 +998,7 @@ volatile bool Temperature::raw_temps_ready = false;
float asymp_temp = (t2 * t2 - t1 * t3) / (2 * t2 - t1 - t3),
block_responsiveness = -log((t2 - asymp_temp) / (t1 - asymp_temp)) / (sample_distance * (sample_count >> 1));
constants.ambient_xfer_coeff_fan0 = constants.heater_power * MPC_MAX / 255 / (asymp_temp - ambient_temp);
constants.ambient_xfer_coeff_fan0 = constants.heater_power * (MPC_MAX) / 255 / (asymp_temp - ambient_temp);
constants.fan255_adjustment = 0.0f;
constants.block_heat_capacity = constants.ambient_xfer_coeff_fan0 / block_responsiveness;
constants.sensor_responsiveness = block_responsiveness / (1.0f - (ambient_temp - asymp_temp) * exp(-block_responsiveness * t1_time) / (t1 - asymp_temp));
@ -1062,7 +1062,7 @@ volatile bool Temperature::raw_temps_ready = false;
#endif
// Calculate a new and better asymptotic temperature and re-evaluate the other constants
asymp_temp = ambient_temp + constants.heater_power / constants.ambient_xfer_coeff_fan0;
asymp_temp = ambient_temp + constants.heater_power * (MPC_MAX) / 255 / constants.ambient_xfer_coeff_fan0;
block_responsiveness = -log((t2 - asymp_temp) / (t1 - asymp_temp)) / (sample_distance * (sample_count >> 1));
constants.block_heat_capacity = constants.ambient_xfer_coeff_fan0 / block_responsiveness;
constants.sensor_responsiveness = block_responsiveness / (1.0f - (ambient_temp - asymp_temp) * exp(-block_responsiveness * t1_time) / (t1 - asymp_temp));
@ -1446,7 +1446,7 @@ void Temperature::min_temp_error(const heater_id_t heater_id) {
if (fabs(e_speed) > planner.settings.max_feedrate_mm_s[E_AXIS])
mpc_e_position = e_position;
else if (e_speed > 0.0f) { // Ignore retract/recover moves
ambient_xfer_coeff += e_speed * FILAMENT_HEAT_CAPACITY_PERMM;
ambient_xfer_coeff += e_speed * constants.filament_heat_capacity_permm;
mpc_e_position = e_position;
}
}

1
Marlin/src/module/temperature.h
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@ -103,6 +103,7 @@ hotend_pid_t;
#if ENABLED(MPC_INCLUDE_FAN)
float fan255_adjustment; // M306 F
#endif
float filament_heat_capacity_permm; // M306 M
} MPC_t;
#endif

3
buildroot/tests/BIGTREE_GTR_V1_0
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@ -37,7 +37,8 @@ opt_set MOTHERBOARD BOARD_BTT_GTR_V1_0 SERIAL_PORT -1 \
MPC_BLOCK_HEAT_CAPACITY '{ 16.7f, 16.7f, 16.7f }' \
MPC_SENSOR_RESPONSIVENESS '{ 0.22f, 0.22f, 0.22f }' \
MPC_AMBIENT_XFER_COEFF '{ 0.068f, 0.068f, 0.068f }' \
MPC_AMBIENT_XFER_COEFF_FAN255 '{ 0.097f, 0.097f, 0.097f }'
MPC_AMBIENT_XFER_COEFF_FAN255 '{ 0.097f, 0.097f, 0.097f }' \
FILAMENT_HEAT_CAPACITY_PERMM '{ 5.6e-3f, 3.6e-3f, 5.6e-3f }'
opt_enable SWITCHING_TOOLHEAD TOOL_SENSOR MPCTEMP MPC_EDIT_MENU MPC_AUTOTUNE_MENU
opt_disable PIDTEMP
exec_test $1 $2 "BigTreeTech GTR | MPC | Switching Toolhead | Tool Sensors" "$3"