fuelAndIgnitionCalcs.c File Reference

Fuel and ignition calculations. More...

#include "inc/freeEMS.h"
#include "inc/utils.h"
#include "inc/commsCore.h"
#include "inc/tableLookup.h"
#include "inc/DecoderInterface.h"
#include "inc/fuelAndIgnitionCalcs.h"

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Defines
#define	FUELANDIGNITIONCALCS_C
Functions
void	calculateFuelAndIgnition ()
	Fuel and ignition calculations.

---

Detailed Description

Fuel and ignition calculations.

This file contains all of the main fuel and ignition calculations based upon the variables that we have already determined in previous stages.

Author:

Fred Cooke

Definition in file fuelAndIgnitionCalcs.c.

---

Define Documentation

#define FUELANDIGNITIONCALCS_C

Definition at line 39 of file fuelAndIgnitionCalcs.c.

---

Function Documentation

void calculateFuelAndIgnition

(

void

)

Fuel and ignition calculations.

Using a variety of primary algorithms calculate a base pulsewidth and then apply various corrections to it such as injector dead time, transient fuel correction, engine temperature enrichment and per cylinder trims. The fuel injection timing is also determined here.

Calculate the ignition timing and dwell here too. Several corrections are applied to these as well.

Todo:

TODO implement the all of the ignition stuff and finish off all of the fuel injection stuff.

TODO change the way configuration is done and make sure the most common options are after the first if().

TODO add actual configuration options to the fixed config blocks for these items.

Author:

Fred Cooke

Todo:

TODO figure out what the correct "temperature" is to make MAF work correctly!

Todo:

TODO make injector channels come from config, not defines.

Todo:

TODO make injector channels come from config, not defines.

Todo:

TODO work needs to be done on scheduling before this can be completed.

Todo:

TODO x 6 main pulsewidths, x 6 staged pulsewidths, x 6 flags for staged channels if(coreSettingsA & STAGED_ON){}

Todo:

TODO determine the requirement for staged based on some sort of map and or complex load based configuration.

Todo:

TODO Calculate the fuel advances (six of)

Todo:

TODO Calculate the dwell period (one of)

Todo:

TODO Calculate the ignition advances (twelve of)

Definition at line 64 of file fuelAndIgnitionCalcs.c.

References ADCArrays, DerivedVar::AirFlow, DerivedVar::BasePW, bootFuelConst, fixedConfig1::coreSettingsA, coreStatusA, CoreVars, currentDwellMath, DerivedVar::densityAndFuel, engineSetting::densityOfFuelAtSTP, densityOfFuelTotalDivisor, DerivedVars, DerivedVar::EffectivePW, fixedConfig1::engineSettings, DerivedVar::ETE, FALSE, fixedConfigs1, fixedConfigs2, CoreVar::IAT, DerivedVar::IDT, IGNITION_CHANNELS, ignitionAdvances, INJECTION_CHANNELS, injectorMainPulseWidthsMath, DerivedVar::Lambda, CoreVar::MAF, CoreVar::MAP, masterPulseWidth, ADCArray::MAT, oneHundredPercentVE, sensorPreset::presetAF, sensorPreset::presetBPW, DerivedVar::RefPW, roomTemperature, safeAdd(), safeScale(), safeTrim(), fixedConfig2::sensorPresets, STAGED_NOT_REQUIRED, STAGED_ON, STAGED_REQUIRED, stoichiometricLambda, DerivedVar::TFCTotal, totalAngleAfterReferenceInjection, ADCArray::TPS, TRUE, and DerivedVar::VEMain.

Referenced by main().

                               {
    /*&&&&&&&&&&&&& Perform the basic calculations one step at a time to get a final pulsewidth &&&&&&&&&&&&*/

    if(TRUE /* Genuine method */){
        unsigned short airInletTemp = CoreVars->IAT; /* All except MAF use this. */
        /* Determine the type of air flow data */
        if(TRUE /* SpeedDensity */){
            /* This won't overflow until 512kPa or about 60psi of boost with 128% VE. */
            DerivedVars->AirFlow = ((unsigned long)CoreVars->MAP * DerivedVars->VEMain) / oneHundredPercentVE;
            /* Result is 450 - 65535 always. */
        }else if(FALSE /*AlphaN*/){
            DerivedVars->AirFlow = DerivedVars->VEMain; /* Not actually VE, but rather tuned air flow without density information */
        }else if(FALSE /*MAF*/){
            DerivedVars->AirFlow = CoreVars->MAF; /* Just fix temperature at appropriate level to provide correct Lambda */
            airInletTemp = roomTemperature; // 293.15k is 20c * 100 to get value, so divide by 100 to get real number
        }else if(FALSE /*FixedAF*/){ /* Fixed air flow from config */
            DerivedVars->AirFlow = fixedConfigs2.sensorPresets.presetAF;
        }else{ /* Default to no fuel delivery and error */
            DerivedVars->AirFlow = 0;
            /* If anyone is listening, let them know something is wrong */
//          sendError(AIRFLOW_NOT_CONFIGURED_CODE); // or maybe queue it?
        }


        /* This won't overflow until well past 125C inlet, 1.5 Lambda and fuel as dense as water */
        DerivedVars->densityAndFuel = (((unsigned long)((unsigned long)airInletTemp * DerivedVars->Lambda) / stoichiometricLambda) * fixedConfigs1.engineSettings.densityOfFuelAtSTP) / densityOfFuelTotalDivisor;
        /* Result is 7500 - 60000 always. */

        /* Divisors for air inlet temp and pressure :
         * #define airInletTempDivisor 100
         * #define airPressureDivisor 100
         * cancel each other out! all others are used. */


        DerivedVars->BasePW = (bootFuelConst * DerivedVars->AirFlow) / DerivedVars->densityAndFuel;
    }else if(FALSE /*configured*/){ /* Fixed PW from config */
        DerivedVars->BasePW = fixedConfigs2.sensorPresets.presetBPW;
    }else{ /* Default to no fuel delivery and error */
        DerivedVars->BasePW = 0;
        /* If anyone is listening, let them know something is wrong */
//      sendError(BPW_NOT_CONFIGURED_CODE); // or maybe queue it?
    }

    /*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/




    /*&&&&&&&&&&&&&&&&&&&&&&&&&&&& Apply All Corrections PCFC, ETE, IDT, TFC etc &&&&&&&&&&&&&&&&&&&&&&&&&&&*/

    /* Apply the corrections after calculating */
    DerivedVars->EffectivePW = safeTrim(DerivedVars->BasePW, DerivedVars->TFCTotal);
    DerivedVars->EffectivePW = safeScale(DerivedVars->EffectivePW, DerivedVars->ETE);


    unsigned char channel; // the declaration of this variable is used in multiple loops below.

    /* "Calculate" the individual fuel pulse widths */
    for(channel = 0; channel < INJECTION_CHANNELS; channel++){ 
        /* Add or subtract the per cylinder fuel trims */
        unsigned short channelPW;
        channelPW = safeScale(DerivedVars->EffectivePW, TablesB.SmallTablesB.perCylinderFuelTrims[channel]);

        /* Add on the IDT to get the final value and put it into the array */
        injectorMainPulseWidthsMath[channel] = safeAdd(channelPW, DerivedVars->IDT);
    }

    /* Reference PW for comparisons etc */
    unsigned short refPW = safeAdd(DerivedVars->EffectivePW, DerivedVars->IDT);
    DerivedVars->RefPW = refPW;
    /*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/




    /*&&&&&&&&&&&&&&&&& Based on IDT schedule PW start such that Fuel is correctly timed &&&&&&&&&&&&&&&&&&&*/

    for(channel = 0;channel < INJECTION_CHANNELS;channel++){ 
        //injectorMainAdvances[channel] = IDT blah blah.
    }

    /* This will involve using RPM, injector firing angle and IDT to schedule the events correctly */

    /*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/




    /*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& Calculate Dwell and Ignition angle &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/
    /*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/




    /*&&&&&&&&&&&&&&& Based on Dwell and Ignition angle schedule the start and end of dwell &&&&&&&&&&&&&&&&*/
    /*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/




    /*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& TEMPORARY (and old) &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/

    /* "Calculate" the nominal total pulse width before per channel corrections */
    masterPulseWidth = refPW;//(ADCArrays->EGO << 6) + (ADCArrays->MAP >> 4);

    /* "Calculate" the individual fuel pulse widths */
    for(channel = 0; channel < INJECTION_CHANNELS; channel++){
        injectorMainPulseWidthsMath[channel] = masterPulseWidth;
    }


    /* Set the staged status on or off (for now based on changeable settings) */
    if(fixedConfigs1.coreSettingsA & STAGED_ON){
        coreStatusA |= STAGED_REQUIRED;
    }else{
        coreStatusA &= STAGED_NOT_REQUIRED;
    }

    // temporary ign tests
    unsigned short intendedAdvance = ADCArrays->MAT << 6;
    unsigned short intendedDwell = intendedAdvance >> 1;

    short c;
    for(c=0;c<IGNITION_CHANNELS;c++){
        ignitionAdvances[IGNITION_CHANNELS] = intendedAdvance;
    }
    *currentDwellMath = intendedDwell;

//  unsigned short minPeriod = ignitionMinimumDwell << 1;
    //  if(intendedDwell < ignitionMinimumDwell){
//      dwellLength = ignitionMinimumDwell;
//  }else{
//      dwellLength = intendedDwell;
//  }
//  if(intendedPeriod < minPeriod){
//      dwellPeriod = minPeriod;
//  }else{
//      dwellPeriod = intendedPeriod;
//  }
//  PITLD0 = dwellPeriod;

    // just use one for all for now...
    totalAngleAfterReferenceInjection = (ADCArrays->TPS << 6);

    /*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& TEMPORARY END &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/
}

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