[Ovmsdev] Nissan Leaf

Sat Dec 28 17:11:46 HKT 2013

I've got a device called the PCAN tool along with a demo monitoring program
which can let me record (I think) 100,000 frames of data. Note there's a
lot of repetition since some frames are sent every 10ms when the car is on.
I am not sure if an ELM wi

The EV bus is active when the car is charging, on, or during a remote
request. The CAR bus is active when the car is on or for a few seconds when
the unlock/lock button is pressed.

I would highly recommend sticking with the EV bus for most of your work
since that's where the charger and battery controller live. The ELM uses
the car can and quires for things on the EV can because the ELM is set up
for ICE cars and that is where they normally have their can communication
bus on the OBD connector.

On Fri, Dec 27, 2013 at 3:34 AM, Nikki Gordon-Bloomfield <
nikki at aminorjourney.com> wrote:

> Hi Mark,
>
> Give me a couple of days. :)
>
> Nikki.
>
>
> On 27 Dec 2013, at 11:33, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
>
> Nikki,
>
> Something like this:
>
> http://theksmith.com/technology/hack-vehicle-bus-cheap-easy-part-1/
>
> Regards, Mark
>
> On 27 Dec, 2013, at 4:30 pm, Nikki Gordon-Bloomfield <
> nikki at littlecollie.com> wrote:
>
> Mark,
>
> Ping me the terminal instructions and I'll see what I can do. Presumably
> you want me to pipe Bluetooth into a log file using cat?
>
> Sent from my iPhone
>
> On 21 Dec 2013, at 14:38, Robert Sharpe <
> robert.sharpe at evergreen-consulting.co.uk> wrote:
>
> Hi Mark,
>
> Sorry it has taken a while to get back to you.  I only have access to
> LeafSpy via my wife's work phone and she has been out most of the week.
> I only just realised that logging could probably be done through the OVMS
> :-( so will try that in the next few days as well.
>
> Anyway, attached is sample LeafSpy Elm Trace.  Before I do lots of testing
> using this method can you confirm that this is useful.
>
> Regards,
> Rob
>
> ---- On Wed, 18 Dec 2013 01:57:50 +0100 *Mark
> Webb-Johnson<mark at webb-johnson.net <mark at webb-johnson.net>>* wrote ----
>
> Nikki,
>
> Thanks for this.
>
> Firstly, I'm glad the firmware is connecting back to the server ok. I
> broke that a few months ago (this new module meant I had to reorganise some
> low-level crypto stuff to make room), and am glad it is fixed again.
>
> For the SOC, I'm really just guessing. Supposedly message 0x5b3 on car can
> bus has GIDs in B6bit0 and B7 - I just divided that by 3 to get a rough
> approximation of SOC, but it is obviously not working. I think this one
> shouldn't be too hard, but I don't have any CAN bus dumps of what the 0x5b3
> message looks like. If I can see a dump, with matching known SOC / GIDs,
> then I am sure we can get this right. That said, active polling (which is
> what leafspy uses) seems to be a better way of getting this, as it gets us
> true GIDs off the EV can bus.
>
> Glad about the parking indicator. I work off the parking brake for that
> one, and it is an important status flag for quite a few things.
>
> I'm working on the polling mechanism at the moment. It is very similar to
> the OBDII VIN number polling mechanism we already have, and my recent work
> on the common vehicle.{h,c} polling code should make this relatively easy.
>
> Regards, Mark.
>
> On 18 Dec, 2013, at 6:22 am, Nikki Gordon-Bloomfield <
> nikki at aminorjourney.com> wrote:
>
> So here’s what I’ve learned from the alpha code so far…
>
> 1) It’s recording the parking status accurately, as far as I can tell.
> within a few minutes of parking, it’s noting that on the app screen.
>
> 2) It’s certainly sending me alerts as you might expect for low SOC
> warnings.
>
> 3) But sadly SOC isn’t working correctly with my car. For some reason, SOC
> is jumping all over the shop, with 22% SOC seemingly a favourite place for
> the OVMS code. On my quick trip just now to the shops, I noted it went from
> 76% SOC (which I think was fairly accurate given the number of bars I had)
> down to 22% when I parked up.
>
> Coming back, I got no update and ended up having to do a hard reboot to
> get the system to wake up.
>
> I haven’t been able to get any logs yet because I don’t have a splitter
> for the ODBII system. I’ll get that sorted later this week/early next.
>
> Nikki.
>
>
>
>
> On 17 Dec 2013, at 20:06, Nikki Gordon-Bloomfield <nikki at aminorjourney.com>
> wrote:
>
> Okay guys.
>
> I’ve done a couple of quick tests with the new beta software.
>
> First up, it installs (Which is good, of course) Second up: I was able to
> drive around the block and see some SOC reports. What did appear to happen
> is that SOC dropped and then went back up again. I had values from 27% SOC
> down to 14% SOC to Empty and back up to 22% SOC.  I’d guesstimate my real
> SOC was nearer 45%.  (Although I didn’t check with LEAFSpy)
>
> Of course, I need to check the other bits and bobs too — Park/Drive status
> seems to work with the car on — but with the module rebooted, it forgets
> what was previously on. This is a problem I believe with the LEAF CAN bus,
> which turns itself off when parked. I’m guessing we’ll need to figure out a
> way to wake up CAN and then switch back off again? (That said,I think it’s
> supposed to stay on when charging… and I’m currently charging)
>
> I’ll play a little more tomorrow and throughout the rest of the week. I’ll
> also try and get some decent logs if I can.
>
> Nikki.
>
>
> On 17 Dec 2013, at 14:16, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
>
>
> Attached is a first-run at Nissan Leaf support, with a few values read
> from the bus passively:
>
>
>    - Speed
>    - Headlight status
>    - Park / Drive status
>    - SOC
>
>
> I’ve also pushed this to github (along with a large number of other small
> changes).
>
> The Nissan Leaf support is proving really hard for me. I don’t have the
> car, or much CAN bus data, and the public documentation is contradictory
> and incomplete. End result is that I am just guessing, and completely
> unable to test my guesses.
>
> Anyway, please try it and let me know if any of those figures show up with
> any sense of accuracy at all.
>
> Going forward, I really need some CAN bus dumps from a Nissan Leaf.
> Specifically:
>
>
>    1. Car idle
>    2. Car plugged in and charge started
>    3. Car charging
>    4. Charge interrupted
>    5. Driving
>    6. Driving as close to a constant speed of 10 kph as possible
>    7. Driving as close to a constant speed of 20 kph as possible
>    8. Driving as close to a constant speed of 30 kph as possible
>    9. Car parked, but on
>    10. Car parked, coming out of park into drive gear
>    11. Car stopped, coming out of drive gear into park
>    12. Car in park gear, then handbrake applied
>
>
> For each of those, both with and without a T connector and LeafSpy running
> would be helpful.
>
> I’m guessing the logs can be gotten from monitor-all mode with an OBDII
> adaptor. There is not too much data on the can bus and that should be fast
> enough.
>
> If anyone can help with the above, please let me know.
>
> Regards, Mark.
>
> <OVMS.X.production.zip>
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