diff --git a/spule.c b/spule.c
index 45bdb28..9341df8 100644
--- a/spule.c
+++ b/spule.c
@@ -87,17 +87,28 @@ void do_spule(){
     }
     else{
         /* speed regulation - keep taenzer at 10% */
-        int32_t tmp = 0;//(100 - (int32_t)taenzer_state.pos/1000);
+        float p = 100.0/(int32_t)(taenzer_state.pos/1000);
+        p-=1;
+        p/=2;
+        p+=1;
 
         //printf("temp1: %d\n", tmp);
         //TODO fix bounds
         //if(tmp < -7500/abzug_speed/2)
         //    tmp = -7500/abzug_speed/2;
         //printf("temp2: %d\n", tmp);
-        if(tmp < -35)
-            tmp = -35;
+        if(p < 0.75)
+            p = 0.75;
+        if(p > 1.5)
+            p = 1.5;
 
-        ICR5=7500/abzug_speed + tmp;
+        uint16_t base_speed = (7500/abzug_speed);
+        uint16_t ctrl_speed = base_speed * p;
+
+        if(ctrl_speed <= 70)
+            ctrl_speed = 70;
+
+        ICR5 = ctrl_speed;
         OCR5C = ICR5/2;
 
         ICR1 = ICR5/TRANS_ROT_FACTOR;