speed_density_airmass.cpp

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#include "pch.h"
#include "speed_density_airmass.h"
 
AirmassResult SpeedDensityAirmass::getAirmass(int rpm, bool postState) {
    ScopePerf perf(PE::GetSpeedDensityFuel);
 
    auto map = getMap(rpm, postState);
 
    return getAirmass(rpm, map, postState);
}
 
AirmassResult SpeedDensityAirmass::getAirmass(float rpm, float map, bool postState) {
    /**
     * most of the values are pre-calculated for performance reasons
     */
    float tChargeK = engine->engineState.sd.tChargeK;
    if (cisnan(tChargeK)) {
        warning(ObdCode::CUSTOM_ERR_TCHARGE_NOT_READY2, "tChargeK not ready"); // this would happen before we have CLT reading for example
        return {};
    }
 
    float ve = getVe(rpm, map, postState);
 
    float airMass = getAirmassImpl(ve, map, tChargeK);
    if (cisnan(airMass)) {
        warning(ObdCode::CUSTOM_ERR_6685, "NaN airMass");
        return {};
    }
#if EFI_PRINTF_FUEL_DETAILS
    printf("getSpeedDensityAirmass map=%.2f\n", map);
#endif /*EFI_PRINTF_FUEL_DETAILS */
 
    return {
        airMass,
        map,    // AFR/VE table Y axis
    };
}
 
float SpeedDensityAirmass::getAirflow(float rpm, float map, bool postState) {
    auto airmassResult = getAirmass(rpm, map, postState);
 
    float massPerCycle = airmassResult.CylinderAirmass * engineConfiguration->cylindersCount;
 
    if (!engineConfiguration->twoStroke) {
        // 4 stroke engines only do a half cycle per rev
        massPerCycle = massPerCycle / 2;
    }
 
    // g/s
    return massPerCycle * rpm / 60;
}
 
float SpeedDensityAirmass::getMap(int rpm, bool postState) const {
    float fallbackMap = m_mapEstimationTable->getValue(rpm, Sensor::getOrZero(SensorType::Tps1));
 
#if EFI_TUNER_STUDIO
    if (postState) {
        engine->outputChannels.fallbackMap = fallbackMap;
    }
#endif // EFI_TUNER_STUDIO
 
    return Sensor::get(SensorType::Map).value_or(fallbackMap);
}