alphan_airmass.cpp

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#include "pch.h"
 
#include "alphan_airmass.h"
#include "fuel_math.h"
 
AirmassResult AlphaNAirmass::getAirmass(float rpm, bool postState) {
    auto tps = Sensor::get(SensorType::Tps1);
 
    if (!tps.Valid) {
        // We are fully reliant on TPS - if the TPS fails, stop the engine.
        return {};
    }
 
    // In this case, VE directly describes the cylinder filling relative to the ideal
    float ve = getVe(rpm, tps.Value, postState);
 
    // optionally use real IAT instead of fixed air temperature
    constexpr float standardIat = STD_IAT;  // std atmosphere temperature
    float iat = engineConfiguration->alphaNUseIat
        ? Sensor::get(SensorType::Iat).value_or(standardIat)
        : standardIat;
 
    float iatK = iat + 273/* todo reuse C_K_OFFSET which would require adjusting unit tests*/;
 
    // TODO: should this be barometric pressure and/or temperature compensated?
    mass_t airmass = getAirmassImpl(
        ve,
        STD_ATMOSPHERE,
        iatK
    );
 
    return {
        airmass,
        tps.Value
    };
}