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Temperature calculation and fans for charging #1

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Temperature calculation and fans for charging #1

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cfb3276
added activation of accumulator fans when BMS is balancing
lpozdneev May 18, 2019
60f4598
added proper temperature calculation for MCU thermistor
lpozdneev May 18, 2019
824b29f
testing can
lpozdneev Jul 20, 2019
807690b
Merge branch 'master' into lpozdneev
lpozdneev Aug 10, 2019
b2fe960
reverted changes to CAN testing code
lpozdneev Aug 10, 2019
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32 changes: 25 additions & 7 deletions Vehicle/Main_Control_Unit/Main_Control_Unit.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -366,11 +366,6 @@ void loop() {
*/
if (mcu_status.get_state() < MCU_STATE_READY_TO_DRIVE && timer_motor_controller_send.check()) {
MC_command_message mc_command_message = MC_command_message(0, 0, 1, 0, 0, 0);

// if (mcu_status.get_state() >= MCU_STATE_ENABLING_INVERTER) {
// mc_command_message.set_inverter_enable(true);
// }

mc_command_message.write(tx_msg.buf);
tx_msg.id = ID_MC_COMMAND_MESSAGE;
tx_msg.len = 8;
Expand Down Expand Up @@ -410,6 +405,16 @@ void parse_can_message() {

if (rx_msg.id == ID_BMS_STATUS) {
bms_status.load(rx_msg.buf);

/*
* Turn on accumulator fans when BMS is balancing
*/
if (bms_status.get_state() > BMS_STATE_CHARGING) {
digitalWrite(FAN_1, HIGH);
}
else {
digitalWrite(FAN_1, LOW);
}
}

if (rx_msg.id == ID_BMS_TEMPERATURES) {
Expand Down Expand Up @@ -521,9 +526,22 @@ void read_status_values() {
mcu_status.set_shutdown_f_above_threshold(analogRead(SENSE_SHUTDOWN_F) > SHUTDOWN_F_HIGH);

/*
* Measure the temperature from on-board thermistors
* Calculate the resistance of the thermistor based on the ADC reading
* R = 10k * ((5V / Vout) + 1)
*/
mcu_status.set_temperature(ADC.read_adc(ADC_TEMPSENSE_CHANNEL) * 100); // send temperatures in 0.01 C
double thermistor_resistance = 1e4 * ((4095.0 / ADC.read_adc(ADC_TEMPSENSE_CHANNEL)) + 1);

/*
* Temperature equation (in Kelvin) based on resistance is the following:
* 1/T = 1/T0 + (1/B) * ln(R/R0) (R = thermistor resistance)
* T = 1/(1/T0 + (1/B) * ln(R/R0))
*/
double T0 = 298.15; // 25C in Kelvin
double b = 3380; // B constant of the thermistor
double R0 = 10000; // Resistance of thermistor at 25C
double temperature = 1 / ((1 / T0) + (1 / b) * log(thermistor_resistance / R0)) - (double) 273.15;

mcu_status.set_temperature(temperature * 100); // send temperatures in 0.01 C
}

/*
Expand Down