IskeSoderlund
Posts: 4
Joined: Tue Apr 03, 2018 2:26 pm
Delivery Date: 03 Apr 2018

Re: LEAF CANbus decoding. (Open discussion)

Sat Sep 08, 2018 1:22 pm

Hi!
Been lurking here for a while, I'm trying to hack a leaf OBD charger. I've come quite a way closer to charging. I've written a program which makes the charger think it's in the leaf. And it seems to work the charger is no longer sending "fault" signals by CAN. And I'm trying to make it charge by sending the same messages that the VCM sends to the leaf when charging, according to CAN captures by carrot. I still haven't been able to make it charge. Is it possible that the charger like the inverter saves DTC and refuses to start charging? If so what's my best option to remove stored DTCs?

If anyone wants my codes for the program or help with making the charger "think" its in a leaf just contact me!

RkEvHopeful
Posts: 19
Joined: Tue Apr 12, 2011 7:40 am
Delivery Date: 07 Jul 2011
Leaf Number: 6154

Re: LEAF CANbus decoding. (Open discussion)

Mon Sep 10, 2018 9:37 am

celeron55 wrote:Project update: I was unable to reverse the charger CAN protocol to an extent that would have made it do any... well, charging. I did get the DC-DC converter to operate, but that was it.

Basically I found out bit 0x04 in the 0x1f2 frame disables the converter (set low to enable, just spam 0x1f2 00 64 00 a0 00 00 00 00 or so every 10ms). You might also need 50b, 1d4 and maybe 55b (probably not). Anyway, that's worthless without the charging working.

I'm now in the process of developing the necessary hardware mods to get it to charge without any co-operation of Nissan's original software. This is actually going fairly well (I already have full control in a lab setup), but making this reproducible or to be something that I can use daily is more difficult.

EDIT: I've basically reverse-engineered enough of the connections to the Renesas R5F35MEEJFE chip that controls the PDM in order to write a new program from scratch for it to do regular charging and dc-dc conversion. Not sure if I'll do that, I'd need a E8a emulator ($150) and basically IAR Embedded Workbench for M16C ($2000? $4000?) to program it. Also, nobody sells these chips for a hobbyist if the one on board is somehow locked. I can find different ones with the same pinout though, eg. R5F35L2EJFE.
Hi celeron55,

Thank you for reporting the results of your work!! I recently started searching the forums again and found your work on reverse-engineering the Leaf.

I have been very happy with my 2011 Leaf until last month when I had to replace the 3.3kW onboard charger (OBC). Now I want to find a way to replace the OBC with an aftermarket charger.

You have gotten the charger working, have you recorded or looked at what is required to make the Leaf work with another charger?

I subscribed to this link to follow your work!

IskeSoderlund
Posts: 4
Joined: Tue Apr 03, 2018 2:26 pm
Delivery Date: 03 Apr 2018

Re: LEAF CANbus decoding. (Open discussion)

Sat Sep 15, 2018 4:44 am

Hi!
Could someone please help me understand this:

So if I want to calculate the SOC of my leaf battery pack how would I do it?
I understand that ID 55B byte 0 and 1 is the data I should use right?
so the message is this and the SOC according to leafspy pro should be 65,3%.
ID: 55B
Data: A9 C0 AA 00 FF C0 10 D6

How should I calculate the SOC from this CAN message?

celeron55
Posts: 21
Joined: Fri Dec 08, 2017 2:52 pm
Location: Finland

Re: LEAF CANbus decoding. (Open discussion)

Sat Sep 15, 2018 9:10 am

Never tried to decode that particular messsge, but 0xa9c0 divided by 0xffff (maximum 16 bit value) equals 66.3%, which is at least close.

jbpalm
Posts: 2
Joined: Mon Jul 10, 2017 3:13 pm
Delivery Date: 11 Jul 2016

Re: LEAF CANbus decoding. (Open discussion)

Thu Nov 15, 2018 11:49 am

I would like to give a short report on our work to create a Vehicle Control Unit that can communicate/control the Leaf inverter/motor assembly.

Now we have completed about 6 months of testing and revisions on our VCU, which controls a 2013 Leaf drivetrain in a converted Geo Metro.

Work started on this project by tapping into a functioning Leaf controller canbus and recording data in various drive modes. The spreadsheet with known canbus information from this forum helped us filter the data and understand useful messages. Member Celeron55 contributed critical data for calculating a checksum and cleared up a few interpretation issues.

We programmed our VCU hardware to send torque responses, and once we were able to test it on pavement, incrementally added multiple user friendly features. The following is a list of what we have so far. The Geo Metro runs very much like a production electric at this point.

- User configurable torque values: maximum, idle regeneration, brake regeneration
- User configurable Forward, Neutral, Reverse options using a SPDT switch and voltage divider
- User configurable minimum precharge voltage for main contactor closure. This ensures precharge is functioning
- User configurable maximum pack voltage during regenerative braking, with feathered torque commands to prevent pack overcharge
- Automatic throttle feathering at regeneration transitions, including floating zero torque position proportional to RPM
- User configuration values and various troubleshooting traces via Putty or Coolterm serial interface
- Torque based brake light activation during regenerative braking

The battery pack in the Geo started at 260 volts and is now at 400, comprised of modules from surplus packs taken from the 2008 MiniE (BMW) limited production. Total capacity now is about 35 KWH, which we estimate will provide between 140 to 180 miles range.

Here is a video made early in the ThunderStruck Motors project. Note the absence of the charger/DCDC module normally on top of the Gen2 inverter. The 3-point Leaf mounts required minor extensions for the Geo mount points. The half-shafts were cut and spliced between Geo and Leaf for the required lengths.

https://www.youtube.com/watch?v=BmwguyYcXm8

Many thanks to all of you who have contributed to information gathering for the Canbus Decoding project on this forum.

NiallDarwin
Posts: 46
Joined: Thu Jul 09, 2015 1:58 am
Delivery Date: 12 Dec 2015
Leaf Number: 004321
Location: New Zealand

Re: LEAF CANbus decoding. (Open discussion)

Mon Nov 19, 2018 2:38 pm

jbpalm wrote:I would like to give a short report on our work to create a Vehicle Control Unit that can communicate/control the Leaf inverter/motor assembly.
Great work! I'm using one of these too. Here's mine working on the bench:

https://youtu.be/8xjG_AcFs70

evcar
Posts: 4
Joined: Tue Aug 30, 2011 4:54 pm
Location: Los Angeles

Re: LEAF CANbus decoding. (Open discussion)

Sat Feb 23, 2019 3:03 pm

Not sure if this was already discussed, but it looks like the "insulation resistance signal" is in message id 0x55b on the ev can bus. It's described in the service manual as a can-bus message for the VCM to know if there is a loss of galvanic isolation (caused by shorted wires, bad insulation, etc.)

I made the tests with the battery pack and 2nd gen BMS (~2013 model yr) outside of the car, and reading the can bus data that's being pushed from the BMS. Then I purposely took various large-value resistors to connect 12V ground with the HV battery pack. The other can bus messages (1db, 1dc, 59e, 5bc, and 5c0) had no noticeable patterns with a resistance change.

The insulation resistance signal appears to be scaled as an 10-bit integer with 0.5k ohm per LSB. Data is in byte 4 (bits 7:0) and byte 5 (bits 7:6). In byte 5, bits 6:0 are not changing and are always zero.

normal operation: ed 80 = 1110 1101 1000 0000 -> 10 bit: 950
392k ohm resistor: a1 00 = 1010 0001 0000 0000 -> 10 bit: 644
102k ohm resistor: 5b c0 = 0101 1011 1100 0000 -> 10 bit: 367

baradhili
Posts: 3
Joined: Sat Nov 03, 2018 6:06 am
Delivery Date: 03 Nov 2018

Re: LEAF CANbus decoding. (Open discussion)

Sun Feb 24, 2019 4:16 pm

Hi all,
is there a location people are placing this data? If there isn't, I'm happy to manage a repo.

Cheers
Bret

mux
Posts: 233
Joined: Sat Jan 13, 2018 3:52 am
Delivery Date: 13 Oct 2011
Leaf Number: 6177

Re: LEAF CANbus decoding. (Open discussion)

Wed Mar 13, 2019 8:35 am

Hello everyone, some of you might know I'm in the business of making range-extender batteries for the LEAF, I've been quite intensively working on electronics for the car in the past few months and have been making a lot of use of the canmsgs spreadsheet as well as adding some of my own findings into it. Not all of this is new, but I have a few additions to make:

- The VCM definitely is the originator for IDs 1D4. 1F2, 50A, 50B, 50C, 5A9, 5B9, 284 and nothing else
- 0x1DC byte 1 lower nibble is the maximum regenerative braking power, 0xF=max, 0x0 is no regen
- 0x1DC byte 2 and 3 (upper nibble) is commanded QC charging current in steps of 0.05A (i.e. 0x9C4=2500=125A).
- 0x5C0 byte 2 is the pack temperature as indicated on the dash, but highly nonlinear (I haven't figured out what it is, also I believe this has been discussed before but is not in the document)

These should be useful to people tinkering with the car. They sure were useful for me.

I'm currently in the process of decoding everything, and I'm doing that with a live EV-CAN logger board I've made plus some live decoding scripts in javascript. With almost everything automated, I expect to be able to interpret all the CAN data pretty quickly. Is it maybe possible for me to get editing privileges on the canmsgs document?

baradhili
Posts: 3
Joined: Sat Nov 03, 2018 6:06 am
Delivery Date: 03 Nov 2018

Re: LEAF CANbus decoding. (Open discussion)

Wed Mar 13, 2019 5:47 pm

I've copied the spreadsheet across to https://github.com/baradhili/leaf_can_bus_messages so it can be updated.

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