Hego Bias / Amplitude

[DOHCTOR_32V]

Trying to make sense of this formula / equation. Would someone please spell it out for me?

Formula:

FOR SMALL BIAS 0 < |BIAS_G/PTPAMP| <= 0.171573 (0.171573 = 3 - SQRT(8))

Equation in my case: (I think)

|-.0840 / .0332| <= 0.171573 (0.171573 = 3 - SQRT(8))

Thanks

[jsa]

It means, for a small bias, bias_g/ptpamp is greater than zero and less than or equal 0.171573.

[DOHCTOR_32V]

I have the full CBAZA documentation which includes the info you posted. It does not offer a solution that is understandable like the other two equations directly above and below that equation in the document do. I guess no one else whom has viewed this post understands it because no one has offered an explanation that indicates what the adjustment subtracted from stoich is for a given, negative BIAS_G/PTPAMP.


FOR NO BIAS |BIAS_G/PTPAMP| = 0


The limit cycle has full jumpback on both sides of stoichiometry and uses
symmetric pulsewidth ramp rates.



FOR SMALL BIAS 0 < |BIAS_G/PTPAMP| <= 0.171573 (0.171573 = 3 - SQRT(8))


The limit cycle has a partial jumpback on one side of stoichiometry to
achieve biasing and uses symmetric pulsewidth ramp rates.



FOR LARGE BIAS 0.171573 < |BIAS_G/PTPAMP| <= 0.45


The limit cycle has no jumpback on one side of stoichiometry and uses
asymmetric pulsewidth ramp rates to achieve biasing.

[jsa]

The direction of the bias is controlled by the sign of the bias value. If the bias term is negative, a rich bias is indicated. If the sign of the bias term is positive, a lean bias is indicated.

[DOHCTOR_32V]

Yes, but how much richer or leaner? That statement does not help solve the equation in order to give a final AFR / Lambda number, so a person knows what AFR to expect from the calculations. We can log it for AFR delta, but that still doesn't enable us to validate or use the equation in a meaningful way, if the formula can't be interpreted.

[red5.0fogger]

It just adds or takes away until it switches rich or lean , then the opposite happens. It's minute amounts in a never ending closed loop.
How much it adds or takes away doesn't matter, unless you just want to know.

[decipha]

Bias is your value from the FN1353 table. 0.084 is not possible as the memory size doesn't permit a number that high. Lets use 0.010 as an example.

Amplitude is from the fn1352 table. 0.0332 isn't possible as the memory size and equation only allows 3 decimals. Lets use 0.033 as an example.

0.010 / 0.033 == 0.303 is our bias/ptpamp

That bias/ptpamp is higher than the max allowed of 0.171572875254 so it gets set to 0.171573 as a max clip.

That value is from your calculator if you simply plug in 3 - 2.82842712474619 == 0.171572875254. All they are doing is notating it there just for reference only.