🚩 MPC update (#24253)
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@ -646,15 +646,15 @@
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//#define MPC_FAN_0_ACTIVE_HOTEND
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#endif
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#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).
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//#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).
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#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).
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//#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).
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// Advanced options
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#define MPC_SMOOTHING_FACTOR 0.5f // (0.0...1.0) Noisy temperature sensors may need a lower value for stabilization.
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#define MPC_MIN_AMBIENT_CHANGE 1.0f // (K/s) Modeled ambient temperature rate of change, when correcting model inaccuracies.
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#define MPC_STEADYSTATE 0.5f // (K/s) Temperature change rate for steady state logic to be enforced.
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#define MPC_TUNING_POS { X_CENTER, Y_CENTER, 1.0f } // (mm) M306 Autotuning position, ideally bed center just above the surface.
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#define MPC_TUNING_POS { X_CENTER, Y_CENTER, 1.0f } // (mm) M306 Autotuning position, ideally bed center at first layer height.
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#define MPC_TUNING_END_Z 10.0f // (mm) M306 Autotuning final Z position.
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#endif
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@ -36,6 +36,7 @@
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* C<joules/kelvin> Block heat capacity.
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* E<extruder> Extruder number to set. (Default: E0)
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* F<watts/kelvin> Ambient heat transfer coefficient (fan on full).
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* H<joules/kelvin/mm> Filament heat capacity per mm.
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* P<watts> Heater power.
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* R<kelvin/second/kelvin> Sensor responsiveness (= transfer coefficient / heat capcity).
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*/
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@ -43,7 +44,7 @@
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void GcodeSuite::M306() {
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if (parser.seen_test('T')) { thermalManager.MPC_autotune(); return; }
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if (parser.seen("ACFPR")) {
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if (parser.seen("ACFPRH")) {
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const heater_id_t hid = (heater_id_t)parser.intval('E', 0);
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MPC_t &constants = thermalManager.temp_hotend[hid].constants;
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if (parser.seenval('P')) constants.heater_power = parser.value_float();
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@ -53,6 +54,7 @@ void GcodeSuite::M306() {
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#if ENABLED(MPC_INCLUDE_FAN)
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if (parser.seenval('F')) constants.fan255_adjustment = parser.value_float() - constants.ambient_xfer_coeff_fan0;
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#endif
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if (parser.seenval('H')) constants.filament_heat_capacity_permm = parser.value_float();
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return;
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}
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@ -70,8 +72,10 @@ void GcodeSuite::M306_report(const bool forReplay/*=true*/) {
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SERIAL_ECHOPAIR_F(" R", constants.sensor_responsiveness, 4);
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SERIAL_ECHOPAIR_F(" A", constants.ambient_xfer_coeff_fan0, 4);
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#if ENABLED(MPC_INCLUDE_FAN)
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SERIAL_ECHOLNPAIR_F(" F", constants.ambient_xfer_coeff_fan0 + constants.fan255_adjustment, 4);
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SERIAL_ECHOPAIR_F(" F", constants.ambient_xfer_coeff_fan0 + constants.fan255_adjustment, 4);
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#endif
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SERIAL_ECHOPAIR_F(" M", constants.filament_heat_capacity_permm, 4);
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SERIAL_EOL();
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}
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}
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@ -3266,6 +3266,7 @@ void MarlinSettings::reset() {
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#if ENABLED(MPC_INCLUDE_FAN)
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constexpr float _mpc_ambient_xfer_coeff_fan255[] = MPC_AMBIENT_XFER_COEFF_FAN255;
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#endif
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constexpr float _filament_heat_capacity_permm[] = FILAMENT_HEAT_CAPACITY_PERMM;
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static_assert(COUNT(_mpc_heater_power) == HOTENDS, "MPC_HEATER_POWER must have HOTENDS items.");
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static_assert(COUNT(_mpc_block_heat_capacity) == HOTENDS, "MPC_BLOCK_HEAT_CAPACITY must have HOTENDS items.");
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@ -3274,6 +3275,7 @@ void MarlinSettings::reset() {
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#if ENABLED(MPC_INCLUDE_FAN)
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static_assert(COUNT(_mpc_ambient_xfer_coeff_fan255) == HOTENDS, "MPC_AMBIENT_XFER_COEFF_FAN255 must have HOTENDS items.");
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#endif
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static_assert(COUNT(_filament_heat_capacity_permm) == HOTENDS, "FILAMENT_HEAT_CAPACITY_PERMM must have HOTENDS items.");
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HOTEND_LOOP() {
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thermalManager.temp_hotend[e].constants.heater_power = _mpc_heater_power[e];
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@ -3283,6 +3285,7 @@ void MarlinSettings::reset() {
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#if ENABLED(MPC_INCLUDE_FAN)
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thermalManager.temp_hotend[e].constants.fan255_adjustment = _mpc_ambient_xfer_coeff_fan255[e] - _mpc_ambient_xfer_coeff[e];
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#endif
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thermalManager.temp_hotend[e].constants.filament_heat_capacity_permm = _filament_heat_capacity_permm[e];
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}
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#endif
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@ -998,7 +998,7 @@ volatile bool Temperature::raw_temps_ready = false;
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float asymp_temp = (t2 * t2 - t1 * t3) / (2 * t2 - t1 - t3),
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block_responsiveness = -log((t2 - asymp_temp) / (t1 - asymp_temp)) / (sample_distance * (sample_count >> 1));
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constants.ambient_xfer_coeff_fan0 = constants.heater_power * MPC_MAX / 255 / (asymp_temp - ambient_temp);
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constants.ambient_xfer_coeff_fan0 = constants.heater_power * (MPC_MAX) / 255 / (asymp_temp - ambient_temp);
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constants.fan255_adjustment = 0.0f;
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constants.block_heat_capacity = constants.ambient_xfer_coeff_fan0 / block_responsiveness;
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constants.sensor_responsiveness = block_responsiveness / (1.0f - (ambient_temp - asymp_temp) * exp(-block_responsiveness * t1_time) / (t1 - asymp_temp));
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@ -1062,7 +1062,7 @@ volatile bool Temperature::raw_temps_ready = false;
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#endif
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// Calculate a new and better asymptotic temperature and re-evaluate the other constants
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asymp_temp = ambient_temp + constants.heater_power / constants.ambient_xfer_coeff_fan0;
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asymp_temp = ambient_temp + constants.heater_power * (MPC_MAX) / 255 / constants.ambient_xfer_coeff_fan0;
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block_responsiveness = -log((t2 - asymp_temp) / (t1 - asymp_temp)) / (sample_distance * (sample_count >> 1));
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constants.block_heat_capacity = constants.ambient_xfer_coeff_fan0 / block_responsiveness;
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constants.sensor_responsiveness = block_responsiveness / (1.0f - (ambient_temp - asymp_temp) * exp(-block_responsiveness * t1_time) / (t1 - asymp_temp));
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@ -1446,7 +1446,7 @@ void Temperature::min_temp_error(const heater_id_t heater_id) {
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if (fabs(e_speed) > planner.settings.max_feedrate_mm_s[E_AXIS])
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mpc_e_position = e_position;
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else if (e_speed > 0.0f) { // Ignore retract/recover moves
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ambient_xfer_coeff += e_speed * FILAMENT_HEAT_CAPACITY_PERMM;
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ambient_xfer_coeff += e_speed * constants.filament_heat_capacity_permm;
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mpc_e_position = e_position;
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}
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}
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@ -103,6 +103,7 @@ hotend_pid_t;
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#if ENABLED(MPC_INCLUDE_FAN)
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float fan255_adjustment; // M306 F
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#endif
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float filament_heat_capacity_permm; // M306 M
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} MPC_t;
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#endif
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@ -37,7 +37,8 @@ opt_set MOTHERBOARD BOARD_BTT_GTR_V1_0 SERIAL_PORT -1 \
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MPC_BLOCK_HEAT_CAPACITY '{ 16.7f, 16.7f, 16.7f }' \
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MPC_SENSOR_RESPONSIVENESS '{ 0.22f, 0.22f, 0.22f }' \
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MPC_AMBIENT_XFER_COEFF '{ 0.068f, 0.068f, 0.068f }' \
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MPC_AMBIENT_XFER_COEFF_FAN255 '{ 0.097f, 0.097f, 0.097f }'
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MPC_AMBIENT_XFER_COEFF_FAN255 '{ 0.097f, 0.097f, 0.097f }' \
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FILAMENT_HEAT_CAPACITY_PERMM '{ 5.6e-3f, 3.6e-3f, 5.6e-3f }'
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opt_enable SWITCHING_TOOLHEAD TOOL_SENSOR MPCTEMP MPC_EDIT_MENU MPC_AUTOTUNE_MENU
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opt_disable PIDTEMP
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exec_test $1 $2 "BigTreeTech GTR | MPC | Switching Toolhead | Tool Sensors" "$3"
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