I would use "typical" operating situation values. To be more specific, in a NA application:
- below 2000 rpm => average cruising pulse widths since it's all about smoothness and fuel efficiency...
Type: Posts; User: barum
I would use "typical" operating situation values. To be more specific, in a NA application:
- below 2000 rpm => average cruising pulse widths since it's all about smoothness and fuel efficiency...
Michael, as I explained in this post, one part is the speed of the air flow and the other is the speed of the fuel spray. These two speeds (if it helps, you can think them as vectors) must be summed...
This is already in use in some of the OEM SW versions. I've tested that as well, but it does not disable the whole dynamic air model, only the parts related to MAP and TPS. I did try several...
You're welcome.
I guess it stops there because over that rpm you're typically in PE/WOT or DFCO (which can be neglected for obvious reasons) modes leading to pulse widths which will be longer...
I am to blame for the FRC formula, so maybe a little explanation is in place.
Calculation consists of two main components:
1) calculating the average air flow speed in the intake channel based...
Since the end result is based on a linear equation, it doesn't really matter.
However,
- since we can't be 100% sure that the boundary is not related to any other function, I'd make as minimal...
This looks really familiar. ;)
It's not as I wrote above, it's the engine torque (estimated from a measured hub torque using 6% losses on Dynomite dyno).
Amazingly well considering how different the engine ouput is compared to stock. On the other hand, the airmass has the biggest effect on the torque so that's why the shapes look pretty similar.
...
I may have missed this information, but does the implemented calculation for the resulting torque (Virtual Torque, that is) also include the effect of these tables (in Gen4)?
- EQ Ratio Based/EQ...
My understanding is that manifold volume impacts on all transient fueling through a mathematical model, tip-in and tip-out included, so I would suggest getting it right first and then continuing with...
He's the top guy in Finland when it comes to oem GM engine controls in supercharged engines.
Ed, here's what a cam with 18 deg overlap did to LS7 VE. MAP at idle 67..68 kPa.
http://kuvapilvi.fi/finnshark/BX5.jpg
Sounds quite possible, especially if the engine in question is LS3, IMHO.
Jh2000, contact this guy. Given the scope of this build, there are so many things to change/recalibrate that learning/experimenting the E38 specifics will take a long time.
Now, that's what I would call an executive summary! :D
So, yes that's reasoning, except I would now use MAT. Of course, with higher airflow the difference is negligible.
The other approach is to...
No, there is not, it's just another way of calculating the conversion factor from the fuel mass to air mass. I simply hadn't stumbled on the CommandedLambda PID until I switched to the 3.0 version.
...
The point I was trying to make is that any conversion from the units used by ECM is done by HPT, so it's not a biggie if you use degC or degK as long as the formula is adjusted accordingly. I'm...
I'm not sure if MAT was even an available PID with '06 E38 and 2.24 I used while developing these so I don't know any better. :)
What's the native unit (as used inside ECM) for MAT? As default HPT...
The blue part is the amount of fuel going through the engine (per combustion) and the red part of the equation converts it to the corresponding amount of air.
CommandedAFR takes care of the...
Greg, since it's all about VE with some GM built-in multipliers, you can iterate towards the (more) correct values w/o afr error (assuming of course that you done your homework on MAF scaling). I...
That's the idea, if I remember correctly (it's been a year or so when I came up with these) plus all the other AFR/lambda related variables are used to "normalize" the situation in PE mode as we want...
Answer: The temperature of the air entering the combustion chamber => if you have MAT, then that's the one to use. Note, that GM uses a factor (depending on the airflow if I remember correctly) to...
That's why it's a good practice to check any formula using the correct (SI) units.
You're welcome. :)
There are several ways to calculate (approximated = assuming some fixed ratio between IAT and ECT) GMVE.
These are the formulas I've been using with 2.24 version, but I haven't done the conversion...