mirror of https://github.com/FOME-Tech/fome-fw.git
115 lines
3.6 KiB
C++
115 lines
3.6 KiB
C++
/**
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* @file speed_density.cpp
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*
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* See http://rusefi.com/wiki/index.php?title=Manual:Software:Fuel_Control#Speed_Density for details
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*
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* @date May 29, 2014
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* @author Andrey Belomutskiy, (c) 2012-2015
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*/
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#include "main.h"
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#include "speed_density.h"
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#include "interpolation.h"
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#include "rpm_calculator.h"
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#include "engine_math.h"
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#include "engine_state.h"
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#define K_AT_MIN_RPM_MIN_TPS 0.25
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#define K_AT_MIN_RPM_MAX_TPS 0.25
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#define K_AT_MAX_RPM_MIN_TPS 0.25
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#define K_AT_MAX_RPM_MAX_TPS 0.9
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#define rpmMin 500
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#define rpmMax 8000
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fuel_Map3D_t veMap;
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fuel_Map3D_t ve2Map;
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fuel_Map3D_t afrMap;
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#define tpMin 0
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#define tpMax 100
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// http://rusefi.com/math/t_charge.html
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float getTCharge(int rpm, float tps, float coolantTemp, float airTemp) {
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float minRpmKcurrentTPS = interpolate(tpMin, K_AT_MIN_RPM_MIN_TPS, tpMax,
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K_AT_MIN_RPM_MAX_TPS, tps);
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float maxRpmKcurrentTPS = interpolate(tpMin, K_AT_MAX_RPM_MIN_TPS, tpMax,
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K_AT_MAX_RPM_MAX_TPS, tps);
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float Tcharge_coff = interpolate(rpmMin, minRpmKcurrentTPS, rpmMax, maxRpmKcurrentTPS, rpm);
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float Tcharge = coolantTemp * (1 - Tcharge_coff) + airTemp * Tcharge_coff;
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return Tcharge;
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}
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/**
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* is J/g*K
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*/
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#define GAS_R 0.28705
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/**
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* @return per cylinder injection time, in seconds
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*/
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float sdMath(engine_configuration_s *engineConfiguration, float VE, float MAP, float AFR, float tempK) {
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if (MAP < 0.001 || cisnan(MAP)) {
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warning(OBD_PCM_Processor_Fault, "invalid MAP value");
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return 0;
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}
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/**
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* todo: pre-calculate gramm/second injector flow to save one multiplication
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* open question if that's needed since that's just a multiplication
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*/
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float injectorFlowRate = cc_minute_to_gramm_second(engineConfiguration->injector.flow);
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// todo: pre-calculate cylinder displacement to save one division
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float cylinderDisplacement = engineConfiguration->specs.displacement / engineConfiguration->specs.cylindersCount;
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float airMass = (cylinderDisplacement * VE * MAP) / (GAS_R * tempK);
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/**
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* injection_pulse_duration = fuel_mass / injector_flow
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* fuel_mass = air_mass / target_afr
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*
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* injection_pulse_duration = (air_mass / target_afr) / injector_flow
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*/
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return airMass / (AFR * injectorFlowRate);
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}
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EXTERN_ENGINE;
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/**
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* @return per cylinder injection time, in Milliseconds
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*/
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float getSpeedDensityFuel(int rpm DECLARE_ENGINE_PARAMETER_S) {
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//int rpm = engine->rpmCalculator->rpm();
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float tps = getTPS(PASS_ENGINE_PARAMETER_F);
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float coolantC = engine->engineState.clt;
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float intakeC = engine->engineState.iat;
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float tChargeK = convertCelsiusToKelvin(getTCharge(rpm, tps, coolantC, intakeC));
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float map = getMap() + engine->accelEnrichment.getEnrichment(PASS_ENGINE_PARAMETER_F);
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float VE = veMap.getValue(map, rpm);
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float AFR = afrMap.getValue(map, rpm);
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return sdMath(engineConfiguration, VE, map, AFR, tChargeK) * 1000;
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}
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void setDetaultVETable(DECLARE_ENGINE_PARAMETER_F) {
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setRpmTableBin(engineConfiguration->veRpmBins, FUEL_RPM_COUNT);
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setTableBin2(engineConfiguration->veLoadBins, FUEL_LOAD_COUNT, 10, 300, 1);
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veMap.setAll(0.8);
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// setRpmTableBin(engineConfiguration->ve2RpmBins, FUEL_RPM_COUNT);
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// setTableBin2(engineConfiguration->ve2LoadBins, FUEL_LOAD_COUNT, 10, 300, 1);
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// ve2Map.setAll(0.81);
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setRpmTableBin(engineConfiguration->afrRpmBins, FUEL_RPM_COUNT);
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setTableBin2(engineConfiguration->afrLoadBins, FUEL_LOAD_COUNT, 10, 300, 1);
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afrMap.setAll(14.7);
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}
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void initSpeedDensity(DECLARE_ENGINE_PARAMETER_F) {
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engine_configuration_s *e = engineConfiguration;
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veMap.init(e->veTable, e->veLoadBins, e->veRpmBins);
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// ve2Map.init(engineConfiguration->ve2Table, engineConfiguration->ve2LoadBins, engineConfiguration->ve2RpmBins);
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afrMap.init(e->afrTable, e->afrLoadBins, e->afrRpmBins);
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}
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