Embedded if statements?

[2002_z28_six_speed]

Before I go through alot of work...

would efi live calc pid support embedded iff's? six deep?

[2002_z28_six_speed]

Yes. EFI live does support them it seems.

[joecar]

iff(boolean_condition, then_calculation, else_calculation)

[2002_z28_six_speed]

Such would be correct.

But no case statments, elseifs, do whiles or fors..... sigh

[2002_z28_six_speed]

Basically I fabbed a casestatement from 7 embedded if statements. It is super hard to logically understand by just looking at it but it seems to work ok. It kinda guesses what gear I am in. Seems to work.

[Garry]

Cool ... care to share?

[2002_z28_six_speed]

Could do that. Do you have M6 or A4? I don't think it would work for A4 due to stall up and the 4L60E can only lock up in 3 and 4.

Basically, I took the theory that MPH/RPM was appox constant IN GEAR and fell in a certain range for each gear.

Like this:

IF MPH/RPM>X AND MPH/RPM<Y,
......gear = 6
..........ELSE
...............IF MPH/RPM > A AND MPH/RPM <B,
....................gear =5
..........................ELSE
........
the periods are to mark the position

I made a case for each gear and finally I stated if it isn't in any of those ranges just say 0. 0 could mean alot of slipping or not moving or in N.


What gears do you have? I wrote out code for my car. It is a M6 with 4,56 gears.

I can't test it much because my laptop battery dies in less than 1 min. I applied it to a logged file and it seemed to work. Haven't tested in real time yet.

[joecar]

lookup(x, a1,b1, a2,b2, a3,b3, ...)

let x = MPH/RPM

then gear = look(x, x0,0, x1,gear1, x2,gear2, x3,gear3, x4,gear4, x5,gear5, x6,gear6, x7,0)

[Garry]

Mine is an M6 w/ 3.73 ... sounds pretty straightforward ...

[Ninety8C5]

Mine is an M6 w/ 3.73 ... sounds pretty straightforward ...

Same here. I would be very interested if someone could work out the values as the PID GM.GEAR doesn't seem to work for the M6.

[joecar]

lookup(x, a1,b1, a2,b2, a3,b3, ...)

let x = MPH/RPM

then gear = look(x, x0,0, x1,gear1, x2,gear2, x3,gear3, x4,gear4, x5,gear5, x6,gear6, x7,0)I just remembered that lookup() interpolates between points... so this may not work in your case.

[2002_z28_six_speed]

Same here. I would be very interested if someone could work out the values as the PID GM.GEAR doesn't seem to work for the M6.

I got the values by looking at what RPMS i had at different speeds and different gears.

This can also be done by calculation instead of observation.

[2002_z28_six_speed]

I just remembered that lookup() interpolates between points... so this may not work in your case.

When I get home maybe I will look to see if EFI Live has an interger or round function.

[2002_z28_six_speed]

"iff({SAE.VSS.mph}/{SAE.RPM} > 0.0357 && {SAE.VSS.mph}/{SAE.RPM} < 0.0445,6,iff({SAE.VSS.mph}/{SAE.RPM} > 0.0255 && {SAE.VSS.mph}/{SAE.RPM} < 0.029857,5,iff({SAE.VSS.mph}/{SAE.RPM} > 0.01881 && {SAE.VSS.mph}/{SAE.RPM} < 0.022,4,iff({SAE.VSS.mph}/{SAE.RPM} > 0.014625 && {SAE.VSS.mph}/{SAE.RPM} < 0.0165,3,iff({SAE.VSS.mph}/{SAE.RPM} > 0.0108 && {SAE.VSS.mph}/{SAE.RPM} < 0.0121,2,iff({SAE.VSS.mph}/{SAE.RPM} > 0.0075 && {SAE.VSS.mph}/{SAE.RPM} > 0.007857,1,0))))))"

I think I have the wrong numbers or I have the syntax wrong and it isn't running right. Kinda shows the idea though. it hits 1 3 5 6 on my stored log. I want to test in real life but my lappy battery is dead. i ordered a new one and the fedex terminal is so far away...

I would suppose a 3,73 M6 would like these numbers better


First=====Second=====Third=====Fourth=====Fifth=== ==Sixth
0.0075===0.0108===0.014625====0.018=====0.0255==== 0.0375
0.00785===0.0121===0.0165=====0.022====0.02985==== =0.044

[2002_z28_six_speed]

Got my first mistake. I wrote up the equation for me with the 373 numbers. Guess that makes it easy for you. Maybe if I plug MY correct gear in there it will work better for me. lol

This site is useful btw
http://www.f-body.org/gears/