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speeduino
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Only perform 2nd derive calcs once per tooth

This commit is contained in:
Josh Stewart 2015-11-17 13:12:19 +11:00
parent 676ea63548
commit 2d4ce39605
1 changed files with 21 additions and 14 deletions
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35
speeduino.ino
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@ -97,8 +97,10 @@ byte fanLOW = LOW; // Used to invert the cooling fan output
struct statuses currentStatus;
volatile int mainLoopCount;
byte deltaToothCount = 0; //The last tooth that was used with the deltaV calc
int rpmDelta;
byte ignitionCount;
unsigned long secCounter; //The next time to increment 'runSecs' counter.
unsigned long secCounter; //The next time to incremen 'runSecs' counter.
int channel1IgnDegrees; //The number of crank degrees until cylinder 1 is at TDC (This is obviously 0 for virtually ALL engines, but there's some weird ones)
int channel2IgnDegrees; //The number of crank degrees until cylinder 2 (and 5/6/7/8) is at TDC
int channel3IgnDegrees; //The number of crank degrees until cylinder 3 (and 5/6/7/8) is at TDC
@ -730,21 +732,26 @@ void loop()
//Any decoder that has uneven spacing has its triggerToothAngle set to 0
if(triggerToothAngle > 0 && toothHistoryIndex >= 3 && currentStatus.RPM < 3000 ) //toothHistoryIndex must be greater than or equal to 3 as we need the last 3 entries. Currently this mode only runs below 3000 rpm
{
int angle1, angle2; //These represent that crank angles that are travelled for the last 2 pulses
if(configPage2.TrigPattern == 4)
//Only recalculate deltaV if the tooth has changed since last time
if (deltaToothCount != toothCurrentCount)
{
//Special case for 70/110 pattern on 4g63
angle2 = triggerToothAngle; //Angle 2 is the most recent
if (angle2 == 70) { angle1 = 110; }
else { angle1 = 70; }
deltaToothCount = toothCurrentCount;
int angle1, angle2; //These represent that crank angles that are travelled for the last 2 pulses
if(configPage2.TrigPattern == 4)
{
//Special case for 70/110 pattern on 4g63
angle2 = triggerToothAngle; //Angle 2 is the most recent
if (angle2 == 70) { angle1 = 110; }
else { angle1 = 70; }
}
else { angle1 = angle2 = triggerToothAngle; }
long toothDeltaV = (1000000L * angle2 / toothHistory[toothHistoryIndex]) - (1000000L * angle1 / toothHistory[toothHistoryIndex-1]);
long toothDeltaT = toothHistory[toothHistoryIndex];
long timeToLastTooth = micros() - toothLastToothTime; //Cannot be unsigned
rpmDelta = (toothDeltaV * timeToLastTooth) / (6 * toothDeltaT);
}
else { angle1 = angle2 = triggerToothAngle; }
long toothDeltaV = (1000000L * angle2 / toothHistory[toothHistoryIndex]) - (1000000L * angle1 / toothHistory[toothHistoryIndex-1]);
long toothDeltaT = toothHistory[toothHistoryIndex];
long timeToLastTooth = micros() - toothLastToothTime; //Cannot be unsigned
int rpmDelta = (toothDeltaV * timeToLastTooth) / (6 * toothDeltaT);
timePerDegree = ldiv( 166666L, (currentStatus.RPM + rpmDelta)).quot; //There is a small amount of rounding in this calculation, however it is less than 0.001 of a uS (Faster as ldiv than / )
}