src/derivedVarsGenerator.c

   1 /* FreeEMS - the open source engine management system
   2  *
   3  * Copyright 2008-2012 Fred Cooke
   4  *
   5  * This file is part of the FreeEMS project.
   6  *
   7  * FreeEMS software is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * FreeEMS software is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with any FreeEMS software.  If not, see http://www.gnu.org/licenses/
  19  *
  20  * We ask that if you make any changes to this file you email them upstream to
  21  * us at admin(at)diyefi(dot)org or, even better, fork the code on github.com!
  22  *
  23  * Thank you for choosing FreeEMS to run your engine!
  24  */
  25
  26
  27 /** @file
  28  *
  29  * @ingroup measurementsAndCalculations
  30  *
  31  * @brief Generate the derived variables.
  32  *
  33  * Second level variables are derived from the core variables and generated here.
  34  *
  35  * @author Fred Cooke
  36  */
  37
  38
  39 #define DERIVEDVARSGENERATOR_C
  40 #include "inc/freeEMS.h"
  41 #include "inc/commsCore.h"
  42 #include "inc/tableLookup.h"
  43 #include "inc/derivedVarsGenerator.h"
  44 #include "inc/locationIDs.h"
  45 #include "inc/decoderInterface.h"
  46
  47
  48 /** @brief Generate the derived variables.
  49  *
  50  * This function uses the core variables to lookup and calculate further second
  51  * order variables such as load, VE, Lamdda, Transient fuel correction, engine
  52  * temperature enrichment, Injector dead time, etc.
  53  *
  54  * @author Fred Cooke
  55  */
  56 void generateDerivedVars(){
  57         /*&&&&&&&&&&&&&&&&&&&& Use basic variables to lookup and calculate derived variables &&&&&&&&&&&&&&&&&&&*/
  58
  59
  60         /* Determine load based on options */
  61         if(TRUE){ /* Use MAP as load */
  62                 DerivedVars->LoadMain = CoreVars->MAP;
  63         }else if(FALSE){ /* Use TPS as load */
  64                 DerivedVars->LoadMain = CoreVars->TPS;
  65         }else if(FALSE){ /* Use AAP corrected MAP as load */
  66                 DerivedVars->LoadMain = ((unsigned long)CoreVars->MAP * CoreVars->AAP) / KPA(100);
  67         }else{ /* Default to MAP, but throw error */
  68                 DerivedVars->LoadMain = CoreVars->MAP;
  69                 /* If anyone is listening, let them know something is wrong */
  70                 sendErrorIfClear(LOAD_NOT_CONFIGURED_CODE); // or maybe queue it?
  71         }
  72
  73
  74         /* Look up VE with RPM and Load */
  75         DerivedVars->VEMain = lookupMainTable(CoreVars->RPM, DerivedVars->LoadMain, VETableMainLocationID);
  76
  77
  78         /* Look up target Lambda with RPM and Load */
  79         DerivedVars->Lambda = lookupMainTable(CoreVars->RPM, DerivedVars->LoadMain, LambdaTableLocationID);
  80
  81
  82         /* Look up injector dead time with battery voltage */
  83         DerivedVars->IDT = lookupTwoDTableUS((twoDTableUS*)&TablesA.SmallTablesA.injectorDeadTimeTable, CoreVars->BRV);
  84
  85         // temp dwell and advance vars...
  86         DerivedVars->Dwell = lookupTwoDTableUS((twoDTableUS*)&TablesA.SmallTablesA.dwellDesiredVersusVoltageTable, CoreVars->BRV);
  87         unsigned long tempAdvance = ANGLE_FACTOR * (unsigned long)lookupMainTable(CoreVars->RPM, DerivedVars->LoadMain, IgnitionAdvanceTableMainLocationID);
  88         DerivedVars->Advance = (unsigned short)(tempAdvance / 1024); // This calculation will change when the timing tables get shrunk to a more reasonable 8 bit size with appropriate scaling
  89         // Move this magic number to an appropriate place and/or refactor timing calcs/values/etc
  90
  91 /// @todo TODO make generic!!!!
  92 // to go generic we need:
  93 // angle between ignition events (if have tpd) (or total angle and number of events)
  94 // max % dwell
  95 // minimum spark time
  96 // a setting to choose which behaviour (don't limit/% dwell limit/min spark time/other?)
  97 #ifdef HOTEL
  98         /// @bug hack for hyundai! 135 = 3/4 of 180 = one cycle...
  99         unsigned long threeQuartersOfAvailableTime = ((unsigned long)CoreVars->DRPM * 135 * ANGLE_FACTOR) / ticks_per_degree_multiplier;
 100         if(DerivedVars->Dwell > threeQuartersOfAvailableTime){
 101                 DerivedVars->Dwell = threeQuartersOfAvailableTime;
 102         }
 103 #endif
 104
 105         /* Look up the engine temperature enrichment percentage with temperature */
 106         DerivedVars->ETE = lookupTwoDTableUS((twoDTableUS*)&TablesA.SmallTablesA.engineTempEnrichmentTablePercent, CoreVars->CHT);
 107         /* TODO The above needs some careful thought put into it around different loads and correction effects. */
 108
 109
 110         /* Calculate the Transient Fuel Correction */
 111         if(TRUE /*WWTFC*/){ /* Do ONLY WW correction if enabled */
 112                 // Do ww stuff, maybe pre done via RTC/RTI for consistent period?
 113                 DerivedVars->TFCTotal = 0; /* TODO replace with real code */
 114         }else if(FALSE /*STDTFC*/){ /* Do any combination of standard approximate methods */
 115                 /* Initialse the variable as a base */
 116                 DerivedVars->TFCTotal = 0;
 117                 /* Based on the rate of change of MAP and some history/taper time */
 118                 if(FALSE /*MAPTFC*/){
 119                         // Do MAP based
 120                         DerivedVars->TFCTotal += 0;
 121                 }
 122
 123                 /* Based on the rate of change of TPS and some history/taper time */
 124                 if(FALSE /*TPSTFC*/){
 125                         // Do TPS based
 126                         DerivedVars->TFCTotal += 0;
 127                 }
 128
 129                 /* Based on the rate of change of RPM and some history/taper time */
 130                 if(FALSE /*RPMTFC*/){
 131                         // Do RPM based
 132                         DerivedVars->TFCTotal += 0;
 133                 }
 134         }else{ /* Default to no correction */
 135                 DerivedVars->TFCTotal = 0;
 136                 /* Don't throw error as correction may not be required */
 137         }
 138
 139         /*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&*/
 140 }