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Merge pull request #607 from luna-cycle/battery_regen_overvoltage_cutoff 

Add regen cutoff to prevent overcharging the battery during braking
This commit is contained in:
Benjamin Vedder 2023-04-01 11:49:05 +02:00 committed by GitHub
parent 898a96478c b481ff73c2
commit 1acbb6e912
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 27 additions and 2 deletions
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6
confgenerator.c
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@ -28,6 +28,8 @@ int32_t confgenerator_serialize_mcconf(uint8_t *buffer, const mc_configuration *
buffer_append_float32_auto(buffer, conf->l_max_vin, &ind);
buffer_append_float32_auto(buffer, conf->l_battery_cut_start, &ind);
buffer_append_float32_auto(buffer, conf->l_battery_cut_end, &ind);
buffer_append_float32_auto(buffer, conf->l_battery_regen_cut_start, &ind);
buffer_append_float32_auto(buffer, conf->l_battery_regen_cut_end, &ind);
buffer[ind++] = conf->l_slow_abs_current;
buffer_append_float16(buffer, conf->l_temp_fet_start, 10, &ind);
buffer_append_float16(buffer, conf->l_temp_fet_end, 10, &ind);
@ -426,6 +428,8 @@ bool confgenerator_deserialize_mcconf(const uint8_t *buffer, mc_configuration *c
conf->l_max_vin = buffer_get_float32_auto(buffer, &ind);
conf->l_battery_cut_start = buffer_get_float32_auto(buffer, &ind);
conf->l_battery_cut_end = buffer_get_float32_auto(buffer, &ind);
conf->l_battery_regen_cut_start = buffer_get_float32_auto(buffer, &ind);
conf->l_battery_regen_cut_end = buffer_get_float32_auto(buffer, &ind);
conf->l_slow_abs_current = buffer[ind++];
conf->l_temp_fet_start = buffer_get_float16(buffer, 10, &ind);
conf->l_temp_fet_end = buffer_get_float16(buffer, 10, &ind);
@ -820,6 +824,8 @@ void confgenerator_set_defaults_mcconf(mc_configuration *conf) {
conf->l_max_vin = MCCONF_L_MAX_VOLTAGE;
conf->l_battery_cut_start = MCCONF_L_BATTERY_CUT_START;
conf->l_battery_cut_end = MCCONF_L_BATTERY_CUT_END;
conf->l_battery_regen_cut_start = MCCONF_L_BATTERY_REGEN_CUT_START;
conf->l_battery_regen_cut_end = MCCONF_L_BATTERY_REGEN_CUT_END;
conf->l_slow_abs_current = MCCONF_L_SLOW_ABS_OVERCURRENT;
conf->l_temp_fet_start = MCCONF_L_LIM_TEMP_FET_START;
conf->l_temp_fet_end = MCCONF_L_LIM_TEMP_FET_END;

2
confgenerator.h
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@ -8,7 +8,7 @@
#include <stdbool.h>
// Constants
#define MCCONF_SIGNATURE 1102884264
#define MCCONF_SIGNATURE 1802104632
#define APPCONF_SIGNATURE 486554156
// Functions

2
datatypes.h
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@ -358,6 +358,8 @@ typedef struct {
float l_max_vin;
float l_battery_cut_start;
float l_battery_cut_end;
float l_battery_regen_cut_start;
float l_battery_regen_cut_end;
bool l_slow_abs_current;
float l_temp_fet_start;
float l_temp_fet_end;

13
motor/mc_interface.c
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@ -2425,12 +2425,23 @@ static void update_override_limits(volatile motor_if_state_t *motor, volatile mc
conf->l_battery_cut_end, conf->l_in_current_max, 0.0);
}
// Regen overvoltage cutoff
float lo_in_min_batt = 0.0;
if (v_in < (conf->l_battery_regen_cut_start + 0.1)) {
lo_in_min_batt = conf->l_in_current_min;
} else if (v_in > (conf->l_battery_regen_cut_end - 0.1)) {
lo_in_min_batt = 0.0;
} else {
lo_in_min_batt = utils_map(v_in, conf->l_battery_regen_cut_start,
conf->l_battery_regen_cut_end, conf->l_in_current_min, 0.0);
}
// Wattage limits
const float lo_in_max_watt = conf->l_watt_max / v_in;
const float lo_in_min_watt = conf->l_watt_min / v_in;
float lo_in_max = utils_min_abs(lo_in_max_watt, lo_in_max_batt);
float lo_in_min = lo_in_min_watt;
float lo_in_min = utils_min_abs(lo_in_min_watt, lo_in_min_batt);
// BMS limits
bms_update_limits(&lo_in_min, &lo_in_max, conf->l_in_current_min, conf->l_in_current_max);

6
motor/mcconf_default.h
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@ -62,6 +62,12 @@
#ifndef MCCONF_L_BATTERY_CUT_END
#define MCCONF_L_BATTERY_CUT_END 8.0 // Limit the positive current completely at this voltage
#endif
#ifndef MCCONF_L_BATTERY_REGEN_CUT_START
#define MCCONF_L_BATTERY_REGEN_CUT_START 1000.0 // Start limiting the regen current at this voltage
#endif
#ifndef MCCONF_L_BATTERY_REGEN_CUT_END
#define MCCONF_L_BATTERY_REGEN_CUT_END 1100.0 // Limit the regen current completely at this voltage
#endif
#ifndef MCCONF_L_RPM_MAX
#define MCCONF_L_RPM_MAX 100000.0 // The motor speed limit (Upper)
#endif