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- changed mixture cutoff from 50% to 30%, to allow for borderline

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leaning at high altitude

- changed to report correct manifold pressure for altitude when engine
  is running
This commit is contained in:
david 2002-01-14 20:44:19 +00:00
parent ea327e59b2
commit 80130682fb
1 changed files with 6 additions and 3 deletions
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9
src/FDM/JSBSim/FGPiston.cpp
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@ -156,7 +156,7 @@ double FGPiston::Calculate(double PowerRequired)
IAS = Auxiliary->GetVcalibratedKTS();
if (Mixture >= 0.5) {
if (Mixture >= 0.3) {
doEngineStartup();
doManifoldPressure();
doAirFlow();
@ -299,6 +299,9 @@ void FGPiston::doManifoldPressure(void)
/**
* Calculate the air flow through the engine.
*
* At this point, ManifoldPressure_inHg still represents the sea-level
* MP, not adjusted for altitude.
*
* Inputs: p_amb, R_air, T_amb, ManifoldPressure_inHg, Displacement,
* RPM, volumetric_efficiency
*
@ -348,8 +351,8 @@ void FGPiston::doFuelFlow(void)
void FGPiston::doEnginePower(void)
{
double True_ManifoldPressure_inHg = ManifoldPressure_inHg * p_amb / p_amb_sea_level;
double ManXRPM = True_ManifoldPressure_inHg * RPM;
ManifoldPressure_inHg *= p_amb / p_amb_sea_level;
double ManXRPM = ManifoldPressure_inHg * RPM;
// FIXME: this needs to be generalized
Percentage_Power = (6e-9 * ManXRPM * ManXRPM) + (8e-4 * ManXRPM) - 1.0;
double T_amb_degF = (T_amb * 1.8) - 459.67;