allow clutch losses when slipping clutch in 1st gear

VectoCore/VectoCore/Models/SimulationComponent/Impl/Clutch.cs

@@ -127,7 +127,7 @@ namespace TUGraz.VectoCore.Models.SimulationComponent.Impl
 			var avgOutAngularVelocity = (PreviousState.OutAngularVelocity + outAngularVelocity) / 2.0;
 			var avgInAngularVelocity = (PreviousState.InAngularVelocity + angularVelocityIn) / 2.0;
 			var clutchLoss = torqueIn * avgInAngularVelocity - outTorque * avgOutAngularVelocity;
-			if (!startClutch && !clutchLoss.IsEqual(0)) {
+			if (!startClutch && !clutchLoss.IsEqual(0) && (DataBus.Gear != 1 || clutchLoss.IsSmaller(0))) {
 				// we don't want to have negative clutch losses, so adapt input torque to match the average output power
 				torqueIn = outTorque * avgOutAngularVelocity / avgInAngularVelocity;
 			}

VectoCore/VectoCoreTest/Models/SimulationComponent/ClutchTest.cs

@@ -59,7 +59,7 @@ namespace TUGraz.VectoCore.Tests.Models.SimulationComponent
 		[Test,
 		// clutch slipping
 		TestCase(DrivingBehavior.Driving, 100, 0, 3, 0, 65.6889),
-		TestCase(DrivingBehavior.Driving, 100, 5, 1, 7.6116, 65.6889),
+		TestCase(DrivingBehavior.Driving, 100, 5, 1, 7.6116, 65.6889), // would cause clutch losses!
 		TestCase(DrivingBehavior.Braking, 100, 80, 1, 100, 80),
 		// clutch opened - would cause neg. clutch losses (which is not possible), torque is adapted
 		TestCase(DrivingBehavior.Halted, 100, 30, 0, 51.1569, 58.643062),