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speeduino
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Complete fuel correction for flex

This commit is contained in:
Josh Stewart 2016-11-28 20:37:24 +11:00
parent aac73d785b
commit 049f3081b1
7 changed files with 34 additions and 24 deletions
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2
comms.ino
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@ -257,7 +257,7 @@ void sendValues(int packetlength, byte portNum)
response[31] = lowByte(currentStatus.rpmDOT);
response[32] = highByte(currentStatus.rpmDOT);
response[33] = currentStatus.flex; //Flex sensor value (or 0 if not used)
response[33] = currentStatus.ethanolPct; //Flex sensor value (or 0 if not used)
response[34] = getNextError();
//cli();

1
corrections.h
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@ -13,5 +13,6 @@ byte correctionASE(); //After Start Enrichment
byte correctionAccel(); //Acceleration Enrichment
byte correctionsFloodClear(); //Check for flood clear on cranking
byte correctionsAFRClosedLoop(); //Closed loop AFR adjustment
byte correctionsFlex(); //Flex fuel adjustment
#endif // CORRECTIONS_H

15
corrections.ino
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@ -64,6 +64,10 @@ byte correctionsTotal()
currentStatus.iatCorrection = correctionsIATDensity();
if (currentStatus.iatCorrection != 100) { sumCorrections = (sumCorrections * currentStatus.iatCorrection); activeCorrections++; }
if (activeCorrections == 3) { sumCorrections = sumCorrections / powint(100,activeCorrections); activeCorrections = 0; }
currentStatus.flexCorrection = correctionsFlex();
if (currentStatus.flexCorrection != 100) { sumCorrections = (sumCorrections * currentStatus.flexCorrection); activeCorrections++; }
if (activeCorrections == 3) { sumCorrections = sumCorrections / powint(100,activeCorrections); activeCorrections = 0; }
currentStatus.launchCorrection = correctionsLaunch();
if (currentStatus.launchCorrection != 100) { sumCorrections = (sumCorrections * currentStatus.launchCorrection); activeCorrections++; }
@ -219,6 +223,17 @@ bool correctionsDFCO()
else { return ( currentStatus.RPM > ( (configPage2.dfcoRPM * 10) + configPage2.dfcoHyster) ) && ( currentStatus.TPS < configPage2.dfcoTPSThresh ); }
}
/*
* Flex fuel adjustment to vary fuel based on ethanol content
* The amount of extra fuel required is a linear relationship based on the % of ethanol.
*/
byte correctionsFlex()
{
if(!configPage1.flexEnabled) { return 100; } //Check for flex being enabled
byte flexRange = configPage1.flexFuelHigh - configPage1.flexFuelLow;
return percentage(currentStatus.ethanolPct, flexRange) + 100;
}
/*
Lookup the AFR target table and perform either a simple or PID adjustment based on this

5
globals.h
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@ -142,10 +142,11 @@ struct statuses {
byte batCorrection; //The amount of battery voltage enrichment currently being applied
byte iatCorrection; //The amount of inlet air temperature adjustment currently being applied
byte launchCorrection; //The amount of correction being applied if launch control is active
byte flexCorrection; //Amount of correction being applied to compensate for ethanol content
byte afrTarget;
byte idleDuty;
bool fanOn; //Whether or not the fan is turned on
byte flex; //Ethanol reading (if enabled). 0 = No ethanol, 100 = pure ethanol. Eg E85 = 85.
byte ethanolPct; //Ethanol reading (if enabled). 0 = No ethanol, 100 = pure ethanol. Eg E85 = 85.
unsigned long TAEEndTime; //The target end time used whenever TAE is turned on
volatile byte squirt;
volatile byte spark;
@ -247,8 +248,6 @@ struct config1 {
unsigned int oddfire2; //The ATDC angle of channel 2 for oddfire
unsigned int oddfire3; //The ATDC angle of channel 3 for oddfire
unsigned int oddfire4; //The ATDC angle of channel 4 for oddfire
byte flexEthPctLow; //Ethanol % represented by flexFreqLow
byte flexEthPctHigh; //Ethanol % represented by flexFreqHigh
byte flexFuelLow; //Fuel % to be used for the lowest ethanol reading (Typically 100%)
byte flexFuelHigh; //Fuel % to be used for the highest ethanol reading (Typically 163%)
byte flexAdvLow; //Additional advance (in degrees) at lowest ethanol reading (Typically 0)

25
reference/speeduino.ini
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@ -208,14 +208,14 @@ page = 2
oddfire2 = scalar, U16, 51, "deg", 1.0, 0.0, 0.0, 720, 0 ; * ( 2 byte)
oddfire3 = scalar, U16, 53, "deg", 1.0, 0.0, 0.0, 720, 0 ; * ( 2 byte)
oddfire4 = scalar, U16, 55, "deg", 1.0, 0.0, 0.0, 720, 0 ; * ( 2 byte)
flexEthPctLow = scalar, U08, 57, "%", 1.0, 0.0, 0.0, 250.0, 0
flexEthPctHigh= scalar, U08, 58, "%", 1.0, 0.0, 0.0, 250.0, 0
flexFuelLow = scalar, U08, 59, "%", 1.0, 0.0, 0.0, 250.0, 0
flexFuelHigh = scalar, U08, 60, "%", 1.0, 0.0, 0.0, 250.0, 0
flexAdvLow = scalar, U08, 61, "Deg", 1.0, 0.0, 0.0, 250.0, 0
flexAdvHigh = scalar, U08, 62, "Deg", 1.0, 0.0, 0.0, 250.0, 0
unused2-63 = scalar, U08, 63, "RPM", 100.0, 0.0, 100, 25500, 0
flexFuelLow = scalar, U08, 57, "%", 1.0, 0.0, 0.0, 250.0, 0
flexFuelHigh = scalar, U08, 58, "%", 1.0, 0.0, 0.0, 250.0, 0
flexAdvLow = scalar, U08, 59, "Deg", 1.0, 0.0, 0.0, 250.0, 0
flexAdvHigh = scalar, U08, 60, "Deg", 1.0, 0.0, 0.0, 250.0, 0
unused2-61 = scalar, U08, 61, "RPM", 100.0, 0.0, 100, 25500, 0
unused2-62 = scalar, U08, 62, "RPM", 100.0, 0.0, 100, 25500, 0
unused2-63 = scalar, U08, 63, "RPM", 100.0, 0.0, 100, 25500, 0
;--------------------------------------------------
;Start Ignition table (Page 3)
@ -737,10 +737,8 @@ menuDialog = main
includeAFR = "When enabled, the current AFR reading is incorporated directly in the pulsewidth calculation as a percentage of the current target ratio. VE table must be retuned when this value is changed. "
flexEnabled = "Turns on readings from the Flex sensor and enables the below adjustments"
flexFreqLow = "The lowest valid frequency of the sensor (50Hz for standard GM/Continental sensor)"
flexFreqHigh = "The highest valid frequency of the sensor (150Hz for standard GM/Continental sensor)"
flexEthPctLow = "Ethanol % represented by Low frequency above (0% for GM Sensors)"
flexEthPctHigh = "Ethanol % represented by High frequency above (100% for GM Sensors)"
flexFreqLow = "The frequency of the sensor at 0% ethanol (50Hz for standard GM/Continental sensor)"
flexFreqHigh = "The frequency of the sensor at 100% ethanol (150Hz for standard GM/Continental sensor)"
flexFuelLow = "Fuel % to be used for the lowest ethanol reading (Typically 100%. ie No adjustment)"
flexFuelHigh = "Fuel % to be used for the highest ethanol reading (Typically 163% for 100% ethanol)"
flexAdvLow = "Additional advance (in degrees) at lowest ethanol reading (Typically 0)"
@ -797,7 +795,6 @@ menuDialog = main
dialog = flexn, ""
field = "#Spark/Fuel"
field = "Sensor Frequency"
field = "Ethanol Mix"
field = "Fuel Multiplier%"
field = "Additional advance"
#field = "#Temp Sense"
@ -807,7 +804,6 @@ menuDialog = main
dialog = flexl, ""
field = "Low"
field = "", flexFreqLow, { flexEnabled }
field = "", flexEthPctLow, { flexEnabled }
field = "", flexFuelLow, { flexEnabled }
field = "", flexAdvLow, { flexEnabled }
#field = "Low"
@ -817,7 +813,6 @@ menuDialog = main
dialog = flexh, ""
field = "High"
field = "", flexFreqHigh, { flexEnabled }
field = "", flexEthPctHigh, { flexEnabled }
field = "", flexFuelHigh, { flexEnabled }
field = "", flexAdvHigh, { flexEnabled }
#field = "High"

2
speeduino.ino
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@ -259,7 +259,7 @@ void setup()
if(configPage1.flexEnabled)
{
attachInterrupt(digitalPinToInterrupt(pinFlex), flexPulse, RISING);
currentStatus.flex = 0;
currentStatus.ethanolPct = 0;
}
//Once the configs have been loaded, a number of one time calculations can be completed

8
timers.ino
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@ -113,7 +113,7 @@ unsigned long targetTachoPulseTime;
{
if(flexCounter < 50)
{
currentStatus.flex = 0; //Standard GM Continental sensor reads from 50Hz (0 ethanol) to 150Hz (Pure ethanol). Subtracting 50 from the frequency therefore gives the ethanol percentage.
currentStatus.ethanolPct = 0; //Standard GM Continental sensor reads from 50Hz (0 ethanol) to 150Hz (Pure ethanol). Subtracting 50 from the frequency therefore gives the ethanol percentage.
flexCounter = 0;
}
else if (flexCounter > 151) //1 pulse buffer
@ -121,19 +121,19 @@ unsigned long targetTachoPulseTime;
if(flexCounter < 169)
{
currentStatus.flex = 100; //Standard GM Continental sensor reads from 50Hz (0 ethanol) to 150Hz (Pure ethanol). Subtracting 50 from the frequency therefore gives the ethanol percentage.
currentStatus.ethanolPct = 100;
flexCounter = 0;
}
else
{
//This indicates an error condition. Spec of the sensor is that errors are above 170Hz)
currentStatus.flex = 0;
currentStatus.ethanolPct = 0;
flexCounter = 0;
}
}
else
{
currentStatus.flex = flexCounter - 50; //Standard GM Continental sensor reads from 50Hz (0 ethanol) to 150Hz (Pure ethanol). Subtracting 50 from the frequency therefore gives the ethanol percentage.
currentStatus.ethanolPct = flexCounter - 50; //Standard GM Continental sensor reads from 50Hz (0 ethanol) to 150Hz (Pure ethanol). Subtracting 50 from the frequency therefore gives the ethanol percentage.
flexCounter = 0;
}