mirror of https://github.com/rusefi/rusefi-1.git
139 lines
4.7 KiB
C++
139 lines
4.7 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) 2012-2017
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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 rpmMin 500
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#define rpmMax 8000
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EXTERN_ENGINE;
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fuel_Map3D_t veMap("VE");
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fuel_Map3D_t ve2Map("VE2");
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afr_Map3D_t afrMap("AFR", 1.0 / AFR_STORAGE_MULT);
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baroCorr_Map3D_t baroCorrMap("baro");
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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 DECLARE_ENGINE_PARAMETER_S) {
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float minRpmKcurrentTPS = interpolate(tpMin, engineConfiguration->tChargeMinRpmMinTps, tpMax,
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engineConfiguration->tChargeMinRpmMaxTps, tps);
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float maxRpmKcurrentTPS = interpolate(tpMin, engineConfiguration->tChargeMaxRpmMinTps, tpMax,
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engineConfiguration->tChargeMaxRpmMaxTps, 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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if (cisnan(Tcharge)) {
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// we can probably end up here while resetting engine state - interpolation would fail
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warning(CUSTOM_ERR_TCHARGE_NOT_READY, "getTCharge NaN");
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return coolantTemp;
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}
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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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float getAirMass(engine_configuration_s *engineConfiguration, float VE, float MAP, float tempK) {
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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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return (cylinderDisplacement * VE * MAP) / (GAS_R * tempK);
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}
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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 airMass, float AFR) {
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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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/**
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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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floatms_t getSpeedDensityFuel(DECLARE_ENGINE_PARAMETER_F) {
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/**
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* most of the values are pre-calculated for performance reasons
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*/
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float tChargeK = ENGINE(engineState.tChargeK);
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if (cisnan(tChargeK)) {
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warning(CUSTOM_ERR_TCHARGE_NOT_READY2, "tChargeK not ready"); // this would happen before we have CLT reading for example
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return 0;
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}
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float map = getMap();
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efiAssert(!cisnan(map), "NaN map", 0);
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float adjustedMap = map + engine->engineLoadAccelEnrichment.getEngineLoadEnrichment(PASS_ENGINE_PARAMETER_F);
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efiAssert(!cisnan(adjustedMap), "NaN adjustedMap", 0);
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float airMass = getAirMass(engineConfiguration, ENGINE(engineState.currentVE), adjustedMap, tChargeK);
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efiAssert(!cisnan(airMass), "NaN airMass", 0);
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#if EFI_PRINTF_FUEL_DETAILS || defined(__DOXYGEN__)
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printf("map=%f adjustedMap=%f airMass=%f\t\n",
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map, adjustedMap, engine->engineState.airMass);
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#endif /*EFI_PRINTF_FUEL_DETAILS */
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engine->engineState.airMass = airMass;
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return sdMath(engineConfiguration, airMass, ENGINE(engineState.targetAFR)) * 1000;
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}
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static const baro_corr_table_t default_baro_corr = {
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{1.141, 1.086, 1.039, 1},
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{1.141, 1.086, 1.039, 1},
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{1.141, 1.086, 1.039, 1},
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{1.141, 1.086, 1.039, 1}
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};
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void setDefaultVETable(DECLARE_ENGINE_PARAMETER_F) {
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setRpmTableBin(config->veRpmBins, FUEL_RPM_COUNT);
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veMap.setAll(80);
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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(config->afrRpmBins, FUEL_RPM_COUNT);
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afrMap.setAll(14.7);
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setRpmTableBin(engineConfiguration->baroCorrRpmBins, BARO_CORR_SIZE);
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setTableBin2(engineConfiguration->baroCorrPressureBins, BARO_CORR_SIZE, 75, 105, 1);
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memcpy(engineConfiguration->baroCorrTable, default_baro_corr, sizeof(default_baro_corr));
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}
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void initSpeedDensity(DECLARE_ENGINE_PARAMETER_F) {
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veMap.init(config->veTable, config->veLoadBins, config->veRpmBins);
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// ve2Map.init(engineConfiguration->ve2Table, engineConfiguration->ve2LoadBins, engineConfiguration->ve2RpmBins);
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afrMap.init(config->afrTable, config->afrLoadBins, config->afrRpmBins);
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baroCorrMap.init(engineConfiguration->baroCorrTable, engineConfiguration->baroCorrPressureBins, engineConfiguration->baroCorrRpmBins);
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}
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