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Add LFP voltage limit support

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This commit is contained in:
Daniel 2023-11-05 17:06:23 +02:00
parent 7c117915e2
commit 6abaedfb01
1 changed files with 48 additions and 17 deletions
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65
Software/src/battery/TESLA-MODEL-3-BATTERY.cpp
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@ -57,6 +57,7 @@ static uint8_t packContactorSetState = 0;
static uint8_t packCtrsClosingAllowed = 0; static uint8_t packCtrsClosingAllowed = 0;
static uint8_t pyroTestInProgress = 0; static uint8_t pyroTestInProgress = 0;
static uint8_t send221still = 10; static uint8_t send221still = 10;
static uint8_t LFP_Chemistry = 0;
//Fault codes //Fault codes
static uint8_t WatchdogReset = 0; //Warns if the processor has experienced a reset due to watchdog reset. static uint8_t WatchdogReset = 0; //Warns if the processor has experienced a reset due to watchdog reset.
static uint8_t PowerLossReset = 0; //Warns if the processor has experienced a reset due to power loss. static uint8_t PowerLossReset = 0; //Warns if the processor has experienced a reset due to power loss.
@ -116,9 +117,13 @@ static const char* hvilStatusState[] = {"NOT OK","STATUS_OK","CURRENT_SOURCE_FAU
#define MAX_SOC 1000 //BMS never goes over this value. We use this info to rescale SOC% sent to inverter #define MAX_SOC 1000 //BMS never goes over this value. We use this info to rescale SOC% sent to inverter
#define MIN_SOC 0 //BMS never goes below this value. We use this info to rescale SOC% sent to inverter #define MIN_SOC 0 //BMS never goes below this value. We use this info to rescale SOC% sent to inverter
#define MAX_CELL_VOLTAGE 4250 //Battery is put into emergency stop if one cell goes over this value (These values might need tweaking based on chemistry) #define MAX_CELL_VOLTAGE_NCA_NCM 4250 //Battery is put into emergency stop if one cell goes over this value
#define MIN_CELL_VOLTAGE 2950 //Battery is put into emergency stop if one cell goes below this value (These values might need tweaking based on chemistry) #define MIN_CELL_VOLTAGE_NCA_NCM 2950 //Battery is put into emergency stop if one cell goes below this value
#define MAX_CELL_DEVIATION 500 //LED turns yellow on the board if mv delta exceeds this value #define MAX_CELL_DEVIATION_NCA_NCM 500 //LED turns yellow on the board if mv delta exceeds this value
#define MAX_CELL_VOLTAGE_LFP 3450 //Battery is put into emergency stop if one cell goes over this value
#define MIN_CELL_VOLTAGE_LFP 2800 //Battery is put into emergency stop if one cell goes over this value
#define MAX_CELL_DEVIATION_LFP 150 //LED turns yellow on the board if mv delta exceeds this value
void update_values_tesla_model_3_battery() void update_values_tesla_model_3_battery()
{ //This function maps all the values fetched via CAN to the correct parameters used for modbus { //This function maps all the values fetched via CAN to the correct parameters used for modbus
@ -199,22 +204,48 @@ void update_values_tesla_model_3_battery()
Serial.println("ERROR: High voltage cable removed while battery running. Opening contactors!"); Serial.println("ERROR: High voltage cable removed while battery running. Opening contactors!");
} }
if(cell_max_v >= MAX_CELL_VOLTAGE){
bms_status = FAULT;
Serial.println("ERROR: CELL OVERVOLTAGE!!! Stopping battery charging and discharging. Inspect battery!");
}
if(cell_min_v <= MIN_CELL_VOLTAGE){
bms_status = FAULT;
Serial.println("ERROR: CELL UNDERVOLTAGE!!! Stopping battery charging and discharging. Inspect battery!");
}
cell_deviation_mV = (cell_max_v - cell_min_v); cell_deviation_mV = (cell_max_v - cell_min_v);
if(cell_deviation_mV > MAX_CELL_DEVIATION){ //Determine which chemistry battery pack is using (crude method, TODO, replace with real CAN data later)
LEDcolor = YELLOW; if(soc_vi > 900){ //When SOC% is over 90.0%, we can use max cell voltage to estimate what chemistry is used
Serial.println("ERROR: HIGH CELL DEVIATION!!! Inspect battery!"); if(cell_max_v < 3450){
LFP_Chemistry = 1;
}
if(cell_max_v > 3700){
LFP_Chemistry = 0;
}
} }
if(LFP_Chemistry){ //LFP limits used for voltage safeties
if(cell_max_v >= MAX_CELL_VOLTAGE_LFP){
bms_status = FAULT;
Serial.println("ERROR: CELL OVERVOLTAGE!!! Stopping battery charging and discharging. Inspect battery!");
}
if(cell_min_v <= MIN_CELL_VOLTAGE_LFP){
bms_status = FAULT;
Serial.println("ERROR: CELL UNDERVOLTAGE!!! Stopping battery charging and discharging. Inspect battery!");
}
if(cell_deviation_mV > MAX_CELL_DEVIATION_LFP){
LEDcolor = YELLOW;
Serial.println("ERROR: HIGH CELL DEVIATION!!! Inspect battery!");
}
}
else{ //NCA/NCM limits used
if(cell_max_v >= MAX_CELL_VOLTAGE_NCA_NCM){
bms_status = FAULT;
Serial.println("ERROR: CELL OVERVOLTAGE!!! Stopping battery charging and discharging. Inspect battery!");
}
if(cell_min_v <= MIN_CELL_VOLTAGE_NCA_NCM){
bms_status = FAULT;
Serial.println("ERROR: CELL UNDERVOLTAGE!!! Stopping battery charging and discharging. Inspect battery!");
}
if(cell_deviation_mV > MAX_CELL_DEVIATION_NCA_NCM){
LEDcolor = YELLOW;
Serial.println("ERROR: HIGH CELL DEVIATION!!! Inspect battery!");
}
}
/* Safeties verified. Perform USB serial printout if configured to do so */ /* Safeties verified. Perform USB serial printout if configured to do so */
#ifdef DEBUG_VIA_USB #ifdef DEBUG_VIA_USB
@ -514,8 +545,8 @@ void printFaultCodesIfActive(){
printDebugIfActive(PowerLossReset, "ERROR: The processor has experienced a reset due to power loss"); printDebugIfActive(PowerLossReset, "ERROR: The processor has experienced a reset due to power loss");
printDebugIfActive(SwAssertion, "ERROR: An internal software assertion has failed"); printDebugIfActive(SwAssertion, "ERROR: An internal software assertion has failed");
printDebugIfActive(CrashEvent, "ERROR: crash signal is detected by HVP"); printDebugIfActive(CrashEvent, "ERROR: crash signal is detected by HVP");
printDebugIfActive(OverDchgCurrentFault, "ERROR: pack discharge is above max discharge current limit!"); printDebugIfActive(OverDchgCurrentFault, "ERROR: Pack discharge current is above the safe max discharge current limit!");
printDebugIfActive(OverChargeCurrentFault, "ERROR: pack discharge current is above max charge current limit!"); printDebugIfActive(OverChargeCurrentFault, "ERROR: Pack charge current is above the safe max charge current limit!");
printDebugIfActive(OverCurrentFault, "ERROR: Pack current (discharge or charge) is above max current limit!"); printDebugIfActive(OverCurrentFault, "ERROR: Pack current (discharge or charge) is above max current limit!");
printDebugIfActive(OverTemperatureFault, "ERROR: A pack module temperature is above the max temperature limit!"); printDebugIfActive(OverTemperatureFault, "ERROR: A pack module temperature is above the max temperature limit!");
printDebugIfActive(OverVoltageFault, "ERROR: A brick voltage is above maximum voltage limit"); printDebugIfActive(OverVoltageFault, "ERROR: A brick voltage is above maximum voltage limit");