Battery-Emulator/Software/RENAULT-ZOE-BATTERY.cpp

#include "RENAULT-ZOE-BATTERY.h"
#include "ESP32CAN.h"
#include "CAN_config.h"

/* Do not change code below unless you are sure what you are doing */
#define LB_MAX_SOC 1000  //BMS never goes over this value. We use this info to rescale SOC% sent to Fronius
#define LB_MIN_SOC 0   //BMS never goes below this value. We use this info to rescale SOC% sent to Fronius
const int rx_queue_size = 10; // Receive Queue size
static uint8_t CANstillAlive = 12; //counter for checking if CAN is still alive 
static uint8_t errorCode = 0; //stores if we have an error code active from battery control logic
static int16_t LB_SOC = 0;
static int16_t LB_SOH = 0;
static int16_t LB_MIN_TEMPERATURE = 0;
static int16_t LB_MAX_TEMPERATURE = 0;
static uint16_t LB_Discharge_Power_Limit = 0;
static uint32_t LB_Discharge_Power_Limit_Watts = 0;
static uint16_t LB_Charge_Power_Limit = 0;
static uint32_t LB_Charge_Power_Limit_Watts = 0;


CAN_frame_t ZOE_423 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_std,}},.MsgID = 0x423,.data = {0x33, 0x00, 0xFF, 0xFF, 0x00, 0xE0, 0x00, 0x00}};

static unsigned long previousMillis10 = 0; // will store last time a 10ms CAN Message was sent
static unsigned long previousMillis100 = 0; // will store last time a 100ms CAN Message was sent
static const int interval10 = 10; // interval (ms) at which send CAN Messages
static const int interval100 = 100; // interval (ms) at which send CAN Messages

void update_values_zoe_battery()
{ //This function maps all the values fetched via CAN to the correct parameters used for modbus
  bms_status = ACTIVE; //Startout in active mode
  
  StateOfHealth = (LB_SOH * 100); //Increase range from 99% -> 99.00% 

  //Calculate the SOC% value to send to Fronius
  LB_SOC = LB_MIN_SOC + (LB_MAX_SOC - LB_MIN_SOC) * (LB_SOC - MINPERCENTAGE_ZOE) / (MAXPERCENTAGE_ZOE - MINPERCENTAGE_ZOE); 
  if (LB_SOC < 0)
  { //We are in the real SOC% range of 0-20%, always set SOC sent to Fronius as 0%
      LB_SOC = 0;
  }
  if (LB_SOC > 1000)
  { //We are in the real SOC% range of 80-100%, always set SOC sent to Fronius as 100%
      LB_SOC = 1000;
  }
  SOC = (LB_SOC * 10); //increase LB_SOC range from 0-100.0 -> 100.00

  battery_voltage;
  battery_current;
	capacity_Wh = BATTERY_WH_MAX;
	remaining_capacity_Wh;

  LB_Discharge_Power_Limit_Watts = (LB_Discharge_Power_Limit * 500); //Convert value fetched from battery to watts
  /* Define power able to be discharged from battery */
  if(LB_Discharge_Power_Limit_Watts > 30000) //if >30kW can be pulled from battery
  {
    max_target_discharge_power = 30000; //cap value so we don't go over the Fronius limits
  }
  else
  {
    max_target_discharge_power = LB_Discharge_Power_Limit_Watts;
  }
  if(SOC == 0) //Scaled SOC% value is 0.00%, we should not discharge battery further
  {
    max_target_discharge_power = 0;
  }
	
  LB_Charge_Power_Limit_Watts = (LB_Charge_Power_Limit * 500); //Convert value fetched from battery to watts
  /* Define power able to be put into the battery */
  if(LB_Charge_Power_Limit_Watts > 30000) //if >30kW can be put into the battery
  {
    max_target_charge_power = 30000; //cap value so we don't go over the Fronius limits
  }
  if(LB_Charge_Power_Limit_Watts < 0)
  {
    max_target_charge_power = 0; //cap calue so we dont do under the Fronius limits
  }
  else
  {
    max_target_charge_power = LB_Charge_Power_Limit_Watts;
  }
  if(SOC == 10000) //Scaled SOC% value is 100.00%
  {
    max_target_charge_power = 0; //No need to charge further, set max power to 0
  }
  
  /* Check if the BMS is still sending CAN messages. If we go 60s without messages we raise an error*/
  if(!CANstillAlive)
  {
    bms_status = FAULT;
    Serial.println("No CAN communication detected for 60s. Shutting down battery control.");
  }
  else
  {
    CANstillAlive--;
  }
	
  stat_batt_power;
	temperature_min;
	temperature_max;

  if(printValues)
  {  //values heading towards the modbus registers
    Serial.print("BMS Status (3=OK): ");
    Serial.println(bms_status);
    Serial.print("Max discharge power: ");
    Serial.println(max_target_discharge_power);
    Serial.print("Max charge power: ");
    Serial.println(max_target_charge_power);
    Serial.print("SOH%: ");
    Serial.println(LB_SOH);
    Serial.print("SOH% to Fronius: ");
    Serial.println(StateOfHealth);
    Serial.print("LB_SOC: ");
    Serial.println(LB_SOC);
    Serial.print("SOC% to Fronius: ");
    Serial.println(SOC);
    Serial.print("Temperature Min: ");
    Serial.println(temperature_min);
    Serial.print("Temperature Max: ");
    Serial.println(temperature_max);
  }
}

void receive_can_zoe_battery(CAN_frame_t rx_frame)
{
  switch (rx_frame.MsgID)
  {
  case 0x155: //BMS1
    CANstillAlive = 12; //Indicate that we are still getting CAN messages from the BMS
    //LB_Max_Charge_Amps = 
    //LB_Current = (((rx_frame.data.u8[1] & 0xF8) << 5) | (rx_frame.data.u8[2]));
    LB_SOC = ((rx_frame.data.u8[4] << 8) | (rx_frame.data.u8[5]));
    break;
  case 0x424: //BMS2
    LB_Charge_Power_Limit = (rx_frame.data.u8[2]);
    LB_Discharge_Power_Limit = (rx_frame.data.u8[3]);
    LB_SOH = (rx_frame.data.u8[5]);
    LB_MIN_TEMPERATURE = ((rx_frame.data.u8[4] & 0x7F) - 40);
    LB_MAX_TEMPERATURE = ((rx_frame.data.u8[7] & 0x7F) - 40);
    break;
  case 0x425: //BMS3 (could also be 445?)
    //LB_kWh_Remaining = 
    //LB_Cell_Max_Voltage = 
    //LB_Cell_Min_Voltage = 
    break;
  default:
    break;
  }
}
void send_can_zoe_battery()
{
  static unsigned long currentMillis = millis();
  // Send 100ms CAN Message
	if (currentMillis - previousMillis100 >= interval100)
	{
		previousMillis100 = currentMillis;

    ESP32Can.CANWriteFrame(&ZOE_423); //Send 0x423 every 100ms to keep BMS happy!
  }
}