throttle_model.cpp File Reference

Functions
static float	pressureRatioFlowCorrection (float pr)
static float	flowCorrections (float pressureRatio, float p_up, float iat)
expected< float >	getThrottleInletPressure ()
float	getThrottlePressureRatio (float map)

Variables
static const float	pressureRatioCorrectionBins [] = { 0.53125, 0.546875, 0.5625, 0.578125, 0.59375, 0.609375, 0.625, 0.640625, 0.65625, 0.671875, 0.6875, 0.703125, 0.71875, 0.734375, 0.750, 0.765625, 0.78125, 0.796875, 0.8125, 0.828125, 0.84375, 0.859375, 0.875, 0.890625, 0.90625, 0.921875, 0.9375, 0.953125 }
static const float	pressureRatioCorrectionValues [] = { 1, 0.9993, 0.998, 0.995, 0.991, 0.986, 0.979, 0.972, 0.963, 0.953, 0.942, 0.930, 0.916, 0.901, 0.884, 0.866, 0.845, 0.824, 0.800, 0.774, 0.745, 0.714, 0.679, 0.642, 0.600, 0.553, 0.449, 0.449 }

Function Documentation

flowCorrections()

static float flowCorrections ( float  pressureRatio, float  p_up, float  iat  )

static

Definition at line 28 of file throttle_model.cpp.

                                                                         {
    // PR correction
    float prCorrectionFactor = pressureRatioFlowCorrection(pressureRatio);
 
    // Inlet density correction
    float tempCorrection = sqrt(C_K_OFFSET / (iat + C_K_OFFSET));
    float pressureCorrection = p_up / STD_ATMOSPHERE;
    float densityCorrection = tempCorrection * pressureCorrection;
 
    return prCorrectionFactor * densityCorrection;
}

Referenced by ThrottleModelBase::partThrottleFlow().

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getThrottleInletPressure()

expected< float > getThrottleInletPressure

(

)

Definition at line 121 of file throttle_model.cpp.

                                           {
    // Use TIP sensor
    // or use Baro sensor if no TIP
    // or use 101.325kPa (std atmosphere) if no Baro
    return Sensor::hasSensor(SensorType::ThrottleInletPressure) ? Sensor::get(SensorType::ThrottleInletPressure) :
                Sensor::hasSensor(SensorType::BarometricPressure) ? Sensor::get(SensorType::BarometricPressure) :
                SensorResult(STD_ATMOSPHERE);
}

Referenced by ThrottleModelBase::estimateThrottleFlow(), and getThrottlePressureRatio().

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getThrottlePressureRatio()

float getThrottlePressureRatio

(

float

map

)

Definition at line 130 of file throttle_model.cpp.

                                         {
    return  map / getThrottleInletPressure().Value;
}

Referenced by readGppwmChannel(), and updatePressures().

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pressureRatioFlowCorrection()

static float pressureRatioFlowCorrection ( float  pr )

static

Definition at line 11 of file throttle_model.cpp.

                                                   {
    if (pr < 0.531) {
        return 1.0;
    }
 
    if (pr > 0.95) {
        return 0.449f;
    }
 
    // float x = pr;
    // float x2 = x * x;
    // float x3 = x2 * x;
    // return -6.9786 * x3 + 11.597 * x2 - 6.7227 * x + 2.3509;
 
    return interpolate2d(pr, pressureRatioCorrectionBins, pressureRatioCorrectionValues);
}

Referenced by flowCorrections().

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Variable Documentation

pressureRatioCorrectionBins

const float pressureRatioCorrectionBins[] = { 0.53125, 0.546875, 0.5625, 0.578125, 0.59375, 0.609375, 0.625, 0.640625, 0.65625, 0.671875, 0.6875, 0.703125, 0.71875, 0.734375, 0.750, 0.765625, 0.78125, 0.796875, 0.8125, 0.828125, 0.84375, 0.859375, 0.875, 0.890625, 0.90625, 0.921875, 0.9375, 0.953125 }

static

Definition at line 9 of file throttle_model.cpp.

{ 0.53125, 0.546875, 0.5625, 0.578125, 0.59375, 0.609375, 0.625, 0.640625, 0.65625, 0.671875, 0.6875, 0.703125, 0.71875, 0.734375, 0.750, 0.765625, 0.78125, 0.796875, 0.8125, 0.828125, 0.84375, 0.859375, 0.875, 0.890625, 0.90625, 0.921875, 0.9375, 0.953125 };

Referenced by pressureRatioFlowCorrection().

pressureRatioCorrectionValues

const float pressureRatioCorrectionValues[] = { 1, 0.9993, 0.998, 0.995, 0.991, 0.986, 0.979, 0.972, 0.963, 0.953, 0.942, 0.930, 0.916, 0.901, 0.884, 0.866, 0.845, 0.824, 0.800, 0.774, 0.745, 0.714, 0.679, 0.642, 0.600, 0.553, 0.449, 0.449 }

static

Definition at line 10 of file throttle_model.cpp.

{       1,   0.9993, 0.998,  0.995,    0.991,   0.986,    0.979, 0.972,    0.963,   0.953,    0.942,  0.930,    0.916,   0.901,    0.884, 0.866,    0.845,   0.824,    0.800,  0.774,    0.745,   0.714,    0.679, 0.642,    0.600,   0.553,    0.449,  0.449    };

Referenced by pressureRatioFlowCorrection().

Go to the source code of this file.