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Conversion of all fuel variables to uS from ms

This commit is contained in:
Josh Stewart 2013-07-03 20:27:46 +10:00
parent f6c197d0e1
commit 89aa44990a
2 changed files with 6 additions and 6 deletions
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6
kartduino.ino
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@ -17,7 +17,7 @@ Need to calculate the req_fuel figure here, preferably in pre-processor macro
#define triggerAngle 110 // The angle (Degrees) from TDC that No 1 cylinder is at when tooth #1 passes the sensor. CANNOT BE 0
//The following lines are configurable, but the defaults are probably pretty good for most applications
#define engineInjectorDeadTime 1.5 //Time in ms that the injector takes to open
#define engineInjectorDeadTime 1500 //Time in uS that the injector takes to open
#define engineSquirtsPerCycle 2 //Would be 1 for a 2 stroke
#define pinInjector 6 //Output pin the injector is on (Assumes 1 cyl only)
@ -98,7 +98,7 @@ void setup() {
attachInterrupt(triggerInterrupt, trigger, FALLING); // Attach the crank trigger wheel interrupt (Hall sensor drags to ground when triggering)
//End crank triger interrupt attachment
req_fuel = req_fuel / engineSquirtsPerCycle; //The req_fuel calculation above gives the total required fuel (At VE 100%) in the full cycle. If we're doing more than 1 squirt per cycle then we need to split the amount accordingly. (Note that in a non-sequential 4-stroke setup you cannot have less than 2 squirts as you cannot determine the stroke to make the single squirt on)
req_fuel_uS = req_fuel_uS / engineSquirtsPerCycle; //The req_fuel calculation above gives the total required fuel (At VE 100%) in the full cycle. If we're doing more than 1 squirt per cycle then we need to split the amount accordingly. (Note that in a non-sequential 4-stroke setup you cannot have less than 2 squirts as you cannot determine the stroke to make the single squirt on)
Serial.begin(9600);
@ -143,7 +143,7 @@ void loop()
//Perform lookup into fuel map for RPM vs MAP value
int VE = getTableValue(fuelTable, MAP, rpm);
//Calculate an injector pulsewidth form the VE
unsigned long pulseWidth = PW(req_fuel, VE, 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
unsigned long pulseWidth = PW(req_fuel_uS, VE, 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
int ignitionAdvance = getTableValue(ignitionTable, MAP, rpm);

6
utils.h
View File

@ -20,11 +20,11 @@ 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 tenths of a ms
injOpen: Injector open time. The time the injector take to open in uS
*/
int PW(float REQ_FUEL, int VE, int MAP, int GammaE, float injOpen)
int PW(int REQ_FUEL, int VE, int MAP, int GammaE, int injOpen)
{
return (REQ_FUEL * (float)(VE/100.0) * (float)(MAP/100.0) * (float)(GammaE/100.0) + injOpen) * 1000;
return (REQ_FUEL * (float)(VE/100.0) * (float)(MAP/100.0) * (float)(GammaE/100.0) + injOpen);
}
/* Determine the Gamma Enrichment number. Forumla borrowed from MS2 manual... may be skipped/simplified for arduino!