[Bull Dog]

This configurable assist/regen mode would be excellent for being able to make the background regen and coasting regen more closely match OEM levels.

The more aggressive regen when I'm not specifically asking for it has been an annoyance and the biggest reasons why I don't like the Current Hack set at 40% with LiBCM.

 

[mudder]

The more aggressive regen when I'm not specifically asking for it has been an annoyance and the biggest reasons why I don't like the Current Hack set at 40% with LiBCM.

I can fix this in LiBCM's firmware... it's been on my TODO list for a while now... I promise I'm getting to it.

 

[mudder]

After driving to Madison, I've decided to add an SPI connection between this product and LiBCM. This will allow LiBCM to control assist/regen (e.g. based on user control from LiDisplay, etc).

 

[Calpod]

After driving to Madison, I've decided to add an SPI connection between this product and LiBCM. This will allow LiBCM to control assist/regen (e.g. based on user control from LiDisplay, etc).

Interesting... I wonder if it will work with the car with MIMA, I would only use one or the other, will it also be able to be added to the existing 5ah LiBcm?

 

[retepsnikrep]

After driving to Madison, I've decided to add an SPI connection between this product and LiBCM.

CAN? Then we CAN all talk to each other.

 

[mudder]

I'm just not certain I want to deal with programming CAN. I've never used it before. SPI is much easier, and it fits my needs well. If LiBCM ever gets CAN, my guess is it will be indirectly, via Pegasus.

 

[retepsnikrep]

Maybe (pretty please feature request) we could get simple CAN capability into your projects via these SPI <> CAN interface boards. It's what I'm using for my IMA control CR-Z man in the middle project.

Can you bring SPI/ 5V power out to some 0.1" SIL pins/holes in the M-MIMA and LIBCM next PCB release so we can fit one of these $2 super cheap boards later for experimenting if we fancy it? It would need a couple of I/O for CS and INT the rest are standard shared SPI/PWR pins.

Both your projects would be a bit more future proof.
We can tinker with CAN then if we want..

https://www.aliexpress.com/item/32817132818.html

 

[mudder]

Can you bring SPI/ 5V power out to some 0.1" SIL pins/holes in the M-MIMA and LIBCM next PCB release so we can fit one of these $2 super cheap boards later for experimenting if we fancy it? It would need a couple of I/O for CS and INT the rest are standard shared SPI/PWR pins.

I've already done so, via an 8p header on the PCB.

 

[thibble]

@mudder any updates on this project? I'd love to have a manual IMA , even if I need to have my steady handed friend solder up on a board for me.

 

[mudder]

It's on my list... behind:
-shipping 5AhG3 battery heater kits
-exiting LiBCM Open Beta
-Laying out LiBCM Daughterboard
-shipping 47Ah FoMoCo kits.

 

[freeberg]

@mudder Do you happen to have a more formal schematic of the one below that can be shared? I'm not asking you to create one, I'm just wondering if it already exists. I would like to attempt to replicate what you have done. Thanks again for all your contributions to this group!

 

[mudder]

At present I do not... right now I have that schematic and a single prototype in my car. The next version of the schematic will have many more signals to increase safety. I recommend holding off on replicating that schematic... it is missing several safety features. It does work... in my car... with the understanding that there are certain conditions that could be unsafe (e.g. it does not disable when you push in the clutch, etc).

 

[freeberg]

Understood. Thanks for the info.

 

[Balto]

At present I do not... right now I have that schematic and a single prototype in my car. The next version of the schematic will have many more signals to increase safety. I recommend holding off on replicating that schematic... it is missing several safety features. It does work... in my car... with the understanding that there are certain conditions that could be unsafe (e.g. it does not disable when you push in the clutch, etc).

I hate the safeties. This is why I love the one I got from Peter when the slider mod was in beta. No safety features whatsoever. I understand for the normal driver it's... Probably a good idea, but I do things sometimes that safety stuff would irritate me, like clutch dumps w/full assist.

 

[mudder]

Since everything I do is open source, you are free to suppress/delete safety features from the firmware as you see fit.

 

[mudder]

4) 12v power. Can you system continue to pass signals during the ten second ign hold after ign turned off period?

Why is this important? The prototype hardware I have now turns off immediately when the key turns off... no CEL or IMA lights on the next key on. What am I missing here?

 

[mudder]

Looks like my specific potentiometer is discontinued... it's still available in black, but I really like the gray one I'm using now... looking at doing a lifetime buy for maybe QTY100 (~$10k).

 

[retepsnikrep]

Why is this important? The prototype hardware I have now turns off immediately when the key turns off... no CEL or IMA lights on the next key on. What am I missing here?

If your prototype didn't set codes then great.
I think I was worrying about setting codes if it didn't power down in the same way as the IMA.
Mine resides inside the MCM so is powered after IGN off for the same time as rest of the IMA stuff.

 

[mudder]

I suspect the ECM stops caring about this data as soon as you turn the key off... it doesn't have any knowledge that the IMA's ignition hold even exists. Yeah, no errors on my end.

...

Here's an update on the OEM signals I plan to use on the RevA hardware:
-VSS (vehicle speed)
-NEP (engine rpm)
-CMDPWR
-MAMODE1
-MAMODE2
-brake pedal status

Note: The above signals are in the floor harness between the seats, which is great because that's where my PCB gets installed. Therefore, you don't need to run any cables up to the dashboard.

Right now I don't plan to use the following signals, but I will have screw terminals for them on RevA:
-MT clutch pedal status, because it is trivially easy to figure this out based on VSS & NEP.
-CVT gear status, because I can't think of any safety reason to do so.
-throttle position sensor. Given @*sean*'s previous thoughts, this one will probably remain on the final product... but I don't plan to initially do anything with it.

Right now I don't plan to use the following signals, and won't have support for them on RevA:
-METSCI, which I had thought about man-in-the-middling in case LiBCM never figures out how to make MCM update SoC gauge. Unfortunately I don't have enough pins available to add this support, and also it's feature creep.
-H-line, because I don't see any reason to add this feature.
-K-line, because I don't see any reason to add this feature.

I'm also planning to add the following additional signals:
-a beeper
-USB (for firmware updates and debugging)
-1 uncommitted screw terminal (because the MCU only has one unused pin left)
-SPI serial connection to LiBCM (if installed)

...

Thoughts?
Note: I'm working on this brainstorming while my in-laws are in town... too many distractions to do anything in firmware right now.

 

[hurricos]

Just to note: I'd be interested in a MU-MIMA kit for my CVT.