diff --git a/firmware/controllers/alternatorController.cpp b/firmware/controllers/alternatorController.cpp
index 63128883b2..4a4861db4f 100644
--- a/firmware/controllers/alternatorController.cpp
+++ b/firmware/controllers/alternatorController.cpp
@@ -18,7 +18,6 @@
 
 #if EFI_ALTERNATOR_CONTROL || defined(__DOXYGEN__)
 
-
 EXTERN_ENGINE
 ;
 
@@ -39,7 +38,8 @@ static msg_t AltCtrlThread(int param) {
         UNUSED(param);
 	chRegSetThreadName("AlternatorController");
 	while (true) {
-		chThdSleepMilliseconds(engineConfiguration->alternatorDT);
+		int dt = maxI(20, engineConfiguration->alternatorDT);
+		chThdSleepMilliseconds(dt);
 
 		currentAltDuty = engineConfiguration->alternatorOffset + altPid.getValue(engineConfiguration->targetVBatt, getVBatt(PASS_ENGINE_PARAMETER_F), 1);
 		if (boardConfiguration->isVerboseAlternator) {
diff --git a/firmware/tunerstudio/rusefi.ini b/firmware/tunerstudio/rusefi.ini
index 5d242848dd..e5db24a657 100644
--- a/firmware/tunerstudio/rusefi.ini
+++ b/firmware/tunerstudio/rusefi.ini
@@ -1359,6 +1359,7 @@ fileVersion = { 20151201 }
 		field = "offset",								alternatorOffset
 		field = "P factor",								alternatorControl_pFactor
 		field = "I factor",								alternatorControl_iFactor
+		field = "D factor",								alternatorControl_dFactor
 		field = "#% duty = Pterm + Iterm + Dterm + offset%"
 		
 	dialog = energySystems, "Battery and Alternator Settings",	yAxis