rusefi.com

(sorry, fixed bug in script, if it didn't work before try again)

I've brought this up in another thread but I think it deserves it's own. I think it's really important from a usability perspective that users have more control over the 2d and 3d maps used by the software. It makes it easier to write software (no need to predict every use case) and it makes it more...

AndreyB wrote: ↑

Fri Nov 26, 2021 11:06 pm

208 pin H7?

I'm not sure what problem that solves? It doesn't seem more readily available than the 176 pin, and the 176 pin already has enough analog inputs, and it takes more board space.

I'm starting to get more serious about building my own board, of course MCU choice is a big concern. I've done a bit of research (as I'm sure others have done), so I thought I'd list it and get some feedback. FWIW I need around 30 analog inputs and 16 digital inputs (at least 9 with input capture ca...

Ohhh you are touching a huge topic. I would love to discuss this further but open question is what is the best format and when would that communication be most effective. For multiple reasons forum long form is my third preference. One on one voice over phone with screen sharing is the best remote ...

So I built a second computer to handle boost, some sensors, etc Can you please elaborate with maybe two pictures of said computer? Would be worth 2048 words. It's in the picture of the interior of the car. From left to right there's my made up PDM (I don't recommend that as a project), my boost con...

Here are some not great pictures. Try not to mock my wiring

BTW if I had a board wishlist, it'd probably include (and no I'm not saying do this for me, it's more to plant ideas on what others may find useful): 1. Large connector so I can have lots of goodies. I saw the 121 pin connector on Aliexpress that is probably the same as some VAG/etc connectors. I do...

Well I don't have any actual hardware yet, but I decided to start working on the software side of RusEFI. A little about my car: I decided to transplant a new-ish motor (BMW N20, turbo 4-cyl GDI) into an old-ish car (BMW E46). I joke that I have a real 4-cyl M3 ;-) The car road races in NASA ST4 in ...

I was having trouble compiling the configuration parser. I got: [javac] /home/scott/src/rusefi/java_console/inifile/src/main/java/com/rusefi/tune/xml/Constant.java:3: error: package javax.xml.bind.annotation does not exist [javac] import javax.xml.bind.annotation.XmlAttribute; [javac] ^ ... This is ...

Oh I forgot to mention decay rate. The HPFP has no way to lower rail pressure other than the emergency relief valve or injecting fuel. So if the target pressure rapidly decreases, you need some logic to say "no, that's not really achievable, lets only lower the pressure by a certain amount com...

I've seen the result on my engine, again configured more by guess than measurement, and this table makes pressure control very smooth. I KNEW I'd seen this idea somewhere! The OEM tune for my Focus had a "Pump VE" table, dependent upon RPM and rail pressure: image.png I guess that's exact...

Oh I forgot to mention decay rate. The HPFP has no way to lower rail pressure other than the emergency relief valve or injecting fuel. So if the target pressure rapidly decreases, you need some logic to say "no, that's not really achievable, lets only lower the pressure by a certain amount comp...

This model based on fuel volume is reasonably good, but it has errors. Yes we could rely on a PI controller to fix that, but in order to reduce the work of the PI controller we add a compensation table. The compensation table is just another adder in the % domain. This table is very easy to tune (j...

I would like to improve the activation hold time logic. Motec actually has a 3d table for this on RPM and battery voltage. Personally I'm not sure why voltage matters if you have a current control output, but from the sounds of the help file I don't think they do use a peak and hold driver, instead...

Of course solenoids have dead time / activation delay, so we need a table for that. The deadtime is pretty small for high current, low inductance peak-hold driven solenoids. IIRC the common HDEV4/5 injectors have a deadtime of something like 100 us. This is the sort of thing the PI controller is fo...

I would like to improve the activation hold time logic. Motec actually has a 3d table for this on RPM and battery voltage. Personally I'm not sure why voltage matters if you have a current control output, but from the sounds of the help file I don't think they do use a peak and hold driver, instead ...

Thank you for the PR and nice write up! While GDI is a bit on hold it's still great to move forward! Well... does it have to be on hold? I have code! I'm willing to do the legwork! Besides, it's a bit of chicken and egg. How would you test GDI hardware without competent control strategies? Why not ...

Forgot to mention, pumps like the HDP5 have a built in valve that bleed off pressure if the rail exceeds a certain amount. On my car with a 200bar typical max pressure, the emergency relief valve is at 250bar. This is necessary not just in case software goes awry, but because fuel expands with heat ...

I'd like to implement the HPFP control strategy. I pushed a first draft of what I think will work: https://github.com/rusefi/rusefi/pull/3453 It is based heavily on an existing standlone ECU control strategy, so I won't claim to have come up with it myself. I did however write all the code. First, s...

I actually disagree that it would be a lot of work to get a tuning and logging app up and running, but I may as well put my time where my mouth is. My day job is in application software. Trust me, the gulf between "up and running" and "usable" is far, far wider than you think it...

Correct, TS is absolutely a limitation of how we can shape the config. The question is not how to design a memory layout that could do something different/fun/interesting, but rewriting an entire GUI tuning app to support that, along with the logging and pretty UI that TS already has implemented . ...

3. Yes, this is a known thing. As you guessed it's a little fiddly to make the transition seamless for users. Well I started down the path of writing a rom converter (actually finished it, ~120 lines of python), but then it dawned on me you might already have something like that? I notice rusefi on...

1. MAP averaging is particularly useful for engines with ITBs or tiny plenums, where the MAP signal may only be valid for a short duration (ie, intake valve is open). Phase aligned sampling also can help avoid any aliasing since the MAP ripple is of course variable frequency. That would seem to req...

I've been reading over some of the code and have come up with some questions. Sorry if this is newbie stuff, but here goes: 1. I see some rather complicated logic around MAP averaging. I assume the idea is to smooth out the pulse that happens as the valves open and close. Any reason not to just use ...

mck1117 wrote: ↑

Fri Oct 29, 2021 12:17 am

I have a spare F429 nucleo if you're in the US.

Thanks, looks like there are available Nucleo boards for a reasonable price.

196kb of ram and 1mb flash min. Which means stm32f407 discovery which is very available I can't find the F407-disco from a reputable supplier, except for stupid $$. Nucle f7 and h7 also have default targets I guess please notice firmware/config/boards folder Ah, didn't see that directory. Looks lik...

What's the current recommendation (given the state of the project and the ongoing chip shortage) for an inexpensive board for software development? I'd like to dip my toes in, but want to do it on real ARM hardware. I found this in stock but it only has 128kB of RAM and is only 100MHz: https://www.m...

I've used a MAX41474 to read FSK data; it can also handle ASK in both 315 and 433 range. That should handle almost any TPMS you'll run across. The downside is it's QFN12 but I was able to solder them using the toaster oven method (the pins are 0.8mm apart, so pretty forgiving as QFN goes). You'll wa...

Very few people use baro For sure not needed but I have started installing them on anything I work on because you just get a better more versatile tune. +1 on using baro. VE changes due to exhaust backpressure, which can be captured using baro. Link G4+ has a concept of MGP (G=gauge instead of A=ab...