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