Looks like if the engine is "Starved" once, it always stays that way
even if the aircraft is refuelled. I have tried to make this work, and
hacked the state machine.
Please review my changes as I may have broken something.
* I have moved the selection of the next state into the appropriate
handler - I think it belongs there
* I have overridden the ConsumeFuel function so that it automatically
sets the state to tpOff if out of fuel.
* The starter operates as follows: the engine is spin-up. After that
state is set to tpStart. In the next iteration Start() will check if
there is fuel or not.
This probably belongs to the jsbsim mail list, but I am not subscribed
there and Jon seems to be reading fg-devel anyway. Sorry if this
caused any inconvenience.
Greets,
Csaba
Index: src/FDM/JSBSim/models/propulsion/FGTurbine.cpp
===================================================================
RCS file:
/var/cvs/FlightGear-0.9/source/src/FDM/JSBSim/models/propulsion/FGTurbine.cpp,v
retrieving revision 1.1.2.1
diff -u -r1.1.2.1 FGTurbine.cpp
--- src/FDM/JSBSim/models/propulsion/FGTurbine.cpp 6 Jan 2007 10:49:26
-0000 1.1.2.1
+++ src/FDM/JSBSim/models/propulsion/FGTurbine.cpp 4 Jun 2007 17:44:54
-0000
@@ -91,29 +91,7 @@
AugmentCmd = 0.0;
}
- // When trimming is finished check if user wants engine OFF or RUNNING
- if ((phase == tpTrim) && (dt > 0)) {
- if (Running && !Starved) {
- phase = tpRun;
- N2 = IdleN2 + ThrottlePos * N2_factor;
- N1 = IdleN1 + ThrottlePos * N1_factor;
- OilTemp_degK = 366.0;
- Cutoff = false;
- }
- else {
- phase = tpOff;
- Cutoff = true;
- EGT_degC = TAT;
- }
- }
-
- if (!Running && Cutoff && Starter) {
- if (phase == tpOff) phase = tpSpinUp;
- }
- if (!Running && !Cutoff && (N2 > 15.0)) phase = tpStart;
- if (Cutoff && (phase != tpSpinUp)) phase = tpOff;
if (dt == 0) phase = tpTrim;
- if (Starved) phase = tpOff;
if (Stalled) phase = tpStall;
if (Seized) phase = tpSeize;
@@ -135,6 +113,16 @@
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+void FGTurbine::ConsumeFuel(void)
+{
+ FGEngine::ConsumeFuel();
+ if (Cutoff || Starved) {
+ phase = tpOff;
+ }
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
double FGTurbine::Off(void)
{
double qbar = Auxiliary->Getqbar();
@@ -148,6 +136,11 @@
NozzlePosition = Seek(&NozzlePosition, 1.0, 0.8, 0.8);
EPR = Seek(&EPR, 1.0, 0.2, 0.2);
Augmentation = false;
+
+ if (Cutoff && Starter) {
+ phase = tpSpinUp;
+ }
+
return 0.0;
}
@@ -209,8 +202,6 @@
}
ConsumeFuel();
- if (Cutoff) phase = tpOff;
- if (Starved) phase = tpOff;
return thrust;
}
@@ -228,6 +219,11 @@
OilTemp_degK = Seek(&OilTemp_degK, TAT + 273.0, 0.2, 0.2);
EPR = 1.0;
NozzlePosition = 1.0;
+
+ if (N2 > 15.0) {
+ phase = tpStart;
+ }
+
return 0.0;
}
@@ -235,7 +231,7 @@
double FGTurbine::Start(void)
{
- if ((N2 > 15.0) && !Starved) { // minimum 15% N2 needed for start
+ if (N2 > 15.0) { // minimum 15% N2 needed for start
Cranking = true; // provided for sound effects signal
if (N2 < IdleN2) {
N2 = Seek(&N2, IdleN2, 2.0, N2/2.0);
@@ -320,6 +316,20 @@
thrust = thrust * InjectionLookup->GetValue();
}
+ // When trimming is finished check if user wants engine OFF or RUNNING
+ if (Running && !Starved) {
+ phase = tpRun;
+ N2 = IdleN2 + ThrottlePos * N2_factor;
+ N1 = IdleN1 + ThrottlePos * N1_factor;
+ OilTemp_degK = 366.0;
+ Cutoff = false;
+ }
+ else {
+ phase = tpOff;
+ Cutoff = true;
+ EGT_degC = TAT;
+ }
+
return thrust;
}
Index: src/FDM/JSBSim/models/propulsion/FGTurbine.h
===================================================================
RCS file:
/var/cvs/FlightGear-0.9/source/src/FDM/JSBSim/models/propulsion/FGTurbine.h,v
retrieving revision 1.1.2.1
diff -u -r1.1.2.1 FGTurbine.h
--- src/FDM/JSBSim/models/propulsion/FGTurbine.h 6 Jan 2007 10:49:26
-0000 1.1.2.1
+++ src/FDM/JSBSim/models/propulsion/FGTurbine.h 4 Jun 2007 17:44:54
-0000
@@ -152,6 +152,7 @@
double GetPowerAvailable(void);
double GetThrust(void) const {return Thrust;}
double Seek(double* var, double target, double accel, double decel);
+ void ConsumeFuel(void);
phaseType GetPhase(void) { return phase; }
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