Add configurable temperature cutoff of motor power

jenkie · Jun 30, 2018 · 217b6f5 · 217b6f5
1 parent e9ecf65
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diff --git a/Arduino_Pedelec_Controller/Arduino_Pedelec_Controller.ino b/Arduino_Pedelec_Controller/Arduino_Pedelec_Controller.ino
@@ -866,6 +866,12 @@ if (loadcell.is_ready())     //new conversion result from load cell available
     else
     {factor_volt=factor_volt*0.9997+0.0003;}
 
+//Temperature cutoff
+#if defined(SUPPORT_THERMISTOR) && defined(SUPPORT_THERMISTOR_CUTOFF)
+    float factor_temperature=constrain(1-(temperature_thermistor-temperature_cutoff_start)/(temperature_cutoff_stop-temperature_cutoff_start),0,1); //linear decrease of maximum power for temperatures higher than temperature_cutoff_start
+    factor_volt=factor_volt*factor_temperature;
+#endif
+
 //Throttle output-------------------------------------------------------------------------------------------------------
 #ifdef SUPPORT_MOTOR_GUESS
     throttle_write=map(pid_out*brake_stat*factor_volt,0,1023,motor_offset,motor_max) + spd/spd_idle*(motor_max-motor_offset);

diff --git a/Arduino_Pedelec_Controller/config.h b/Arduino_Pedelec_Controller/config.h
@@ -183,6 +183,10 @@ const float thermistor_t0=0.00335401643;     // 1/T0 of thermistor in 1/K
 const float thermistor_b=0.00025316455;      // 1/beta of thermistor in 1/K
 const float thermistor_r=10;                 // r of thermistor in kOhm
 
+//#define SUPPORT_THERMISTOR_CUTOFF          //uncomment to use thermistor for temperature cutoff of motor power
+const int temperature_cutoff_start=100;    //start of temperature cutoff (100% power)
+const int temperature_cutoff_stop=120;     //stop of temperature cutoff in °C (0% power)
+
 //#define SUPPORT_HX711                        //uncomment this if you want to use a load cell with hx711 amplifier
 const byte hx711_data=20;                    //data pin of hx711 sensor
 const byte hx711_sck=21;                     //clock pin of hx711 sensor