shift strategy: disengage if engine speed is below idle speed in first gear,

combustion engine: log warning if below idle speed

VectoCore/VectoCore/Models/SimulationComponent/Impl/AMTShiftStrategy.cs

@@ -163,6 +163,9 @@ namespace TUGraz.VectoCore.Models.SimulationComponent.Impl
 			}
 
 			// emergency shift to not stall the engine ------------------------
+			if (gear == 1 && SpeedTooLowForEngine(_nextGear, inAngularVelocity / ModelData.Gears[gear].Ratio)) {
+				return true;
+			}
 			_nextGear = gear;
 			while (_nextGear > 1 && SpeedTooLowForEngine(_nextGear, inAngularVelocity / ModelData.Gears[gear].Ratio)) {
 				_nextGear--;

VectoCore/VectoCore/Models/SimulationComponent/Impl/CombustionEngine.cs

@@ -348,7 +348,9 @@ namespace TUGraz.VectoCore.Models.SimulationComponent.Impl
 		protected override void DoWriteModalResults(IModalDataContainer container)
 		{
 			var avgEngineSpeed = (PreviousState.EngineSpeed + CurrentState.EngineSpeed) / 2.0;
-
+			if (avgEngineSpeed.IsSmaller(EngineIdleSpeed, DataBus.ExecutionMode == ExecutionMode.Engineering ? 20.RPMtoRad():1e-3.RPMtoRad())) {
+				Log.Warn("EngineSpeed below idling speed! n_eng_avg: {0}, n_idle: {1}", avgEngineSpeed, EngineIdleSpeed);
+			}
 			container[ModalResultField.P_eng_fcmap] = CurrentState.EngineTorque * avgEngineSpeed;
 			container[ModalResultField.P_eng_out] = container[ModalResultField.P_eng_out] is DBNull
 				? CurrentState.EngineTorqueOut * avgEngineSpeed