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speeduino
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Add Alpha-N algorithm option

This commit is contained in:
Josh Stewart 2013-12-22 23:44:25 +11:00
parent fc60e4ee95
commit 5a1e226b3d
3 changed files with 20 additions and 4 deletions
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2
kartduino.ino
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@ -218,7 +218,7 @@ void loop()
//Perform lookup into fuel map for RPM vs MAP value
currentStatus.VE = getTableValue(fuelTable, currentStatus.MAP, currentStatus.RPM);
//Calculate an injector pulsewidth form the VE
currentStatus.PW = PW(req_fuel_uS, currentStatus.VE, currentStatus.MAP, 100, engineInjectorDeadTime); //The 100 here is just a placeholder for any enrichment factors (Cold start, acceleration etc). To add 10% extra fuel, this would be 110
currentStatus.PW = PW_SD(req_fuel_uS, currentStatus.VE, currentStatus.MAP, 100, engineInjectorDeadTime); //The 100 here is just a placeholder for any enrichment factors (Cold start, acceleration etc). To add 10% extra fuel, this would be 110
//Perform a lookup to get the desired ignition advance
currentStatus.advance = getTableValue(ignitionTable, currentStatus.MAP, currentStatus.RPM);

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reference/schematic.fzz
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22
utils.h
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@ -15,14 +15,17 @@ int AIRDEN(int MAP, int temp)
}
/*
This functino retuns a pulsewidth time (in us) given the following:
This function retuns a pulsewidth time (in us) using a hybrid Alpha-N algorithm, given the following:
REQ_FUEL
VE: Lookup from the main MAP vs RPM fuel table
MAP: In KPa, read from the sensor
GammaE: Sum of Enrichment factors (Cold start, acceleration). This is a multiplication factor (Eg to add 10%, this should be 110)
injOpen: Injector open time. The time the injector take to open in uS
injDT: Injector dead time. The time the injector take to open minus the time it takes to close (Both in uS)
TPS: Throttle position (0% to 100%)
This function is called by PW_SD and PW_AN for speed0density and pure Alpha-N calculations respectively.
*/
int PW(int REQ_FUEL, byte VE, byte MAP, int GammaE, int injOpen)
int PW(int REQ_FUEL, byte VE, byte MAP, int GammaE, int injOpen, byte TPS)
{
//Standard float version of the calculation
//return (REQ_FUEL * (float)(VE/100.0) * (float)(MAP/100.0) * (float)(GammaE/100.0) + injOpen);
@ -32,13 +35,26 @@ int PW(int REQ_FUEL, byte VE, byte MAP, int GammaE, int injOpen)
int iVE = ((int)VE << 7) / 100;
int iMAP = ((int)MAP << 7) / 100;
int iGammaE = (GammaE << 7) / 100;
int iTPS = ((int)TPS << 7) / 100;
unsigned long intermediate = ((long)REQ_FUEL * (long)iVE) >>7; //Need to use an intermediate value to avoid overflowing the long
intermediate = (intermediate * iMAP) >> 7;
intermediate = (intermediate * iGammaE) >> 7;
intermediate = (intermediate * iTPS) >> 7;
return (int)intermediate + injOpen;
}
//Convenience function for Speed Density
int PW_SD(int REQ_FUEL, byte VE, byte MAP, int GammaE, int injOpen)
{
return PW(REQ_FUEL, VE, MAP, GammaE, injOpen, 1); //Just use 1 in place of the TPS
}
int PW_AN(int REQ_FUEL, byte VE, byte TPS, int GammaE, int injOpen)
{
return PW(REQ_FUEL, VE, 1, GammaE, injOpen, TPS); //Just use 1 in place of the MAP
}
/* Determine the Gamma Enrichment number. Forumla borrowed from MS2 manual... may be skipped/simplified for arduino!
WARMUP: Warmup Correction