177 lines
6.2 KiB
C++
177 lines
6.2 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) 2012-2018
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*/
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#include "global.h"
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#include "globalaccess.h"
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#include "speed_density.h"
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#include "interpolation.h"
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#include "engine.h"
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#include "engine_math.h"
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#include "maf2map.h"
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#include "config_engine_specs.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_SUFFIX) {
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if (cisnan(coolantTemp) || cisnan(airTemp)) {
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warning(CUSTOM_ERR_NAN_TCHARGE, "t-getTCharge NaN");
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return coolantTemp;
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}
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float Tcharge_coff;
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if (CONFIG(tChargeMode) == TCHARGE_MODE_AIR_INTERP) {
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const floatms_t gramsPerMsToKgPerHour = (3600.0f * 1000.0f) / 1000.0f;
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// We're actually using an 'old' airMass calculated for the previous cycle, but it's ok, we're not having any self-excitaton issues
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floatms_t airMassForEngine = engine->engineState.airMass * CONFIG(specs.cylindersCount);
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// airMass is in grams per 1 cycle for 1 cyl. Convert it to airFlow in kg/h for the engine.
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// And if the engine is stopped (0 rpm), then airFlow is also zero (avoiding NaN division)
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floatms_t airFlow = (rpm == 0) ? 0 : airMassForEngine * gramsPerMsToKgPerHour / getEngineCycleDuration(rpm PASS_ENGINE_PARAMETER_SUFFIX);
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// just interpolate between user-specified min and max coefs, based on the max airFlow value
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Tcharge_coff = interpolateClamped(0.0, CONFIG(tChargeAirCoefMin), CONFIG(tChargeAirFlowMax), CONFIG(tChargeAirCoefMax), airFlow);
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// save it for console output (instead of MAF massAirFlow)
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engine->engineState.airFlow = airFlow;
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} else {
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// TCHARGE_MODE_RPM_TPS
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float minRpmKcurrentTPS = interpolateMsg("minRpm", tpMin, CONFIG(tChargeMinRpmMinTps), tpMax,
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CONFIG(tChargeMinRpmMaxTps), tps);
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float maxRpmKcurrentTPS = interpolateMsg("maxRpm", tpMin, CONFIG(tChargeMaxRpmMinTps), tpMax,
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CONFIG(tChargeMaxRpmMaxTps), tps);
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Tcharge_coff = interpolateMsg("Kcurr", rpmMin, minRpmKcurrentTPS, rpmMax, maxRpmKcurrentTPS, rpm);
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}
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if (cisnan(Tcharge_coff)) {
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warning(CUSTOM_ERR_T2_CHARGE, "t2-getTCharge NaN");
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return coolantTemp;
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}
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// We use a robust interp. function for proper tcharge_coff clamping.
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float Tcharge = interpolateClamped(0.0f, coolantTemp, 1.0f, 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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/**
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* @return air mass in grams
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*/
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static float getCycleAirMass(float volumetricEfficiency, float MAP, float tempK DECLARE_GLOBAL_SUFFIX) {
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return (get_specs_displacement * volumetricEfficiency * MAP) / (GAS_R * tempK);
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}
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float getCylinderAirMass(float volumetricEfficiency, float MAP, float tempK DECLARE_GLOBAL_SUFFIX) {
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return getCycleAirMass(volumetricEfficiency, MAP, tempK PASS_GLOBAL_SUFFIX)
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/ get_specs_cylindersCount;
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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(float airMass, float AFR DECLARE_GLOBAL_SUFFIX) {
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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(get_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(float map DECLARE_GLOBAL_SUFFIX) {
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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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efiAssert(CUSTOM_ERR_ASSERT, !cisnan(map), "NaN map", 0);
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float adjustedMap = map + engine->engineLoadAccelEnrichment.getEngineLoadEnrichment(PASS_GLOBAL_SIGNATURE);
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efiAssert(CUSTOM_ERR_ASSERT, !cisnan(adjustedMap), "NaN adjustedMap", 0);
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float airMass = getCylinderAirMass(ENGINE(engineState.currentVE), adjustedMap, tChargeK PASS_GLOBAL_SUFFIX);
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if (cisnan(airMass)) {
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warning(CUSTOM_ERR_6685, "NaN airMass");
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return 0;
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}
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#if EFI_PRINTF_FUEL_DETAILS
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printf("map=%.2f adjustedMap=%.2f airMass=%.2f\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(airMass, ENGINE(engineState.targetAFR) PASS_GLOBAL_SUFFIX) * 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_SIGNATURE) {
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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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// setLinearCurve(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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setLinearCurve(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_SIGNATURE) {
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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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initMaf2Map();
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}
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