Controlling the Instrument Cluster's Display

So I hooked up my oscilloscope to one of my injectors to see what I got.



I started the car and let it idle, and looked at the waveform to see how long the injector was actually open.

Here, the car was reporting ~0.76ms, but we can see the injector was actually on for ~3.02ms:



That comes out to the value the car reports being almost exactly four times less than the actual injector on time. This held true for a few other samples with slightly different on times that I gathered.

However, when I re-did the calculations, it's still not right. It's at least in the ballpark of what the FCD shows, but too low now. (I'm now assuming 140cc/min instead of 145).

Here's a few more data points (the ms values are 4x what the car reports and fuel flow is 140cc/min):

3000 rpm, 34mph, 2.8ms, FCD shows ~95
= 73mpg (77% of 95)

1700 rpm, 37 mph, 5.0ms, FCD ~100
= 78mpg (78% of 100)

1900 rpm, 34mph, 5.3ms, FCD ~70mpg
= 61mpg (87% of 70)

1900 rpm, 55mph, 6ms, FCD ~100 (original data)
= 87mpg (87% of 100)

Looks like 4x the reported value isn't quite the "fudge factor" we're looking for. Maybe I'll buy an inverter so I can power the scope in my car while I go for a drive to see if it always stays around 4x or if it changes. I'll also have PEGASUS output RPM, ms, MPH, and FCD MPG to my logic analyzer so I can capture the values to look at later (I'm currently looking at the speedo, tachometer, FIN value and FCD and remembering all the numbers until I can stop to write them down).

Took a break from coding to work on a vectorized version of the instrument cluster's display. This is going to be used in the eventual Pegasus user manual for showing menus, what the screens look like, etc. without having to use photos.

This is all vector art, I can change the colors of the segments to "turn them on" or off and the entire thing can be scaled as large as you want without it getting pixellated. I'll be releasing the file for this eventually.

retepsnikrep said:

How did you do that vector oem display graphic?

Click to expand...

It's done in Adobe Illustrator, pretty much all by hand. I used my photos of the display and made them as straight as I could, then used that as a guide for making all the segments and whatnot. The bar graphs were made by putting one rectangle at each end, then using Illustrator's "blend" tool plus a circular path to fill in the rest. The seven-segment digits were traced by hand with the pen tool.
It's mostly just drawing different shapes that you can add together and subtract from each other to get the thing you want.

highwater said:

So even in its basic released state, would a splash screen, that wraps all the gauges up to max for a function check and return to a "pre-ignition key on state" be programmable?

Useless, but looks cool

Randall

Click to expand...

I was thinking about making a custom startup screen, actually. I could do it at this point, but I'm focusing on more important stuff right now!