rusefi.com

The drafted schematic has many issues. I'd also like if the diodes clamped to gnd instead of the +5 rail. In other similar circuits, I've seen that clamped energy self power the 5v and override the ability to shut off the 5v. So I typically either avoid that style of clamp or I add something like a ...

Is phase shift a concern? I guess that would probably get compensated for during tuning.

Jared says Still in early stages of noodling this over, but this might mostly work. I basically just split off the op-amps to have a virtual ground. I think this would likely allow for a 1 wire VR, connect VR+ to GND, then VR- would be the other VR wire. Granted in 1 wire mode, it would have a lowe...

chaoschris wrote: ↑

Tue Jan 31, 2023 7:23 am

@ kb1gtt : The resistors are in parallel, so the resistance is 0,33 Ohm...

Oops. I just updated the math. Thanks for the clarification. It's still significant heat to deal with.

0.3 ohm sense resistance @ 1 amp = 0.3 watts. Plus your normal switching loses from the transistor. I'd expect it needs good heat sinking, or good injector design. AKA injector would want to be large enough to keep the WOT duty low and lower ECU dissipated watts, but the injector would want to be sm...

Is scilab of interest in this effort? I see this review.
https://www.g2.com/compare/scilab-vs-simulink

Includes links to his physics engine.
https://github.com/ange-yaghi/delta-studio

https://opulo.io/

I recall some concern about the transition time as well. AKA faster or slower devices may cause issues. I recall this concern was an unknown, so if you make a change I suggest to make low QTY order and test before committing to larger QTY.

A tip, if you put the security lug back on, put all of them on one wheel, like the rear passenger side. Then you mostly don't care about the stupid adapter.

Cool to see progress. Thanks Scott for the recent kick to get it moving along again.

In my scope capture, the vertical scale is questionable. I don't trust it because I didn't calibrate verify it first. It was a quick measure and seemed to be in the ball park. I think Matt's capture says 2 amps. The big thing is that I think a 4.5 amp driver will be ok.

In this post, I measured OEM in the hold pattern was about 4.5 amps. The yellow trace was 2amps per vertical division. So it would appear the hold voltage is below 12v.

https://rusefi.com/forum/viewtopic.php?t=1631&start=12

Cover it with a tarp?

Stackup can be found here.
https://jlcpcb.com/quote/pcbOrderFaq/PCB%20Stackup

From memory I think it was 1oz external and 0.5 oz internal.

Ah there we go just the encryption key. I remembered it was a small thing like that.

Did we have some small change to the internal firmware? From memory I think there was a small change. Also from memory the current firmware would work on both. Something like if.serieal number blah then X instead of Y.

I think we expect them to be interchangeable.

I understand x-ray inspection to validate proper soldering is also a key feature from OEM. Which is difficult for us.

Have you tried square hot air tips? Similar to this.

??? What do you need to know? Do you have injectors etc? Are you looking to learn how to wire it? Not sure what you need.

I recall timing for both fuel and spark are a bit different then 2 stroke, but totally doable if it's detailed enough for developers to implement. I recall you could get it running with 2 stroke, but to get it to run well, it's expected that some timing changes would be needed. I recall that on prio...

Also have you considered a more off the shelf solution? The beagle bone might be of interest.

https://www.seeedstudio.com/7-Inch-LCD-Cape-for-Beagle-Bone-Black-Touch-Display-p-1697.html

Have you considered uGFX that works well with ChibiOS. I've dubbed around a bit with the STM32F429 dev board with the touch LCD. It seemed to work reasonably well for me.

An MBED effort? Isn't that sacrificing a bunch of diagnostics options?

You in the NH ME area? I might know of one of these you might have interest in.

Perhaps change the current sensor? It seems you just trying to sense the amps. See below video it details the use of a low cost board you can get on ebay.

If we integrate into scratch, we could potentially attract many kids they would work for free.
https://scratch.mit.edu/

Scratch is a fairly decent graphical / easy to use programming environment. It might not be that far fetch of an idea to use as a higher level programming environment.

Most OEMs have tools which allow then to specify high level stuff. They spec number of cyls, injector flow rates, etc. The tool then splices together the code they need to operate the engine. I recall Freescale has one that can be downloaded for free.

I would like to suggest using a real harness connector then make an adapter for db15 db37. Those db connectors have problems relative to automotive applications.