mirror of https://github.com/FOME-Tech/fome-fw.git
44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
#include "pch.h"
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#include "maf_airmass.h"
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#include "maf.h"
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AirmassResult MafAirmass::getAirmass(int rpm) {
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float maf = Sensor::getOrZero(SensorType::Maf);
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return getAirmassImpl(maf, rpm);
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}
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/**
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* Function block now works to create a standardised load from the cylinder filling as well as tune fuel via VE table.
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* @return total duration of fuel injection per engine cycle, in milliseconds
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*/
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AirmassResult MafAirmass::getAirmassImpl(float massAirFlow, int rpm) const {
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// If the engine is stopped, MAF is meaningless
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if (rpm == 0) {
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return {};
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}
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// kg/hr -> g/s
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float gramPerSecond = massAirFlow * 1000 / 3600;
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// 1/min -> 1/s
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float revsPerSecond = rpm / 60.0f;
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mass_t airPerRevolution = gramPerSecond / revsPerSecond;
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// Now we have to divide among cylinders - on a 4 stroke, half of the cylinders happen every revolution
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// This math is floating point to work properly on engines with odd cylinder count
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float halfCylCount = engineConfiguration->specs.cylindersCount / 2.0f;
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mass_t cylinderAirmass = airPerRevolution / halfCylCount;
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//Create % load for fuel table using relative naturally aspirated cylinder filling
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float airChargeLoad = 100 * cylinderAirmass / engine->standardAirCharge;
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//Correct air mass by VE table
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mass_t correctedAirmass = cylinderAirmass * getVe(rpm, airChargeLoad);
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return {
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correctedAirmass,
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airChargeLoad, // AFR/VE/ignition table Y axis
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};
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}
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