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 Post subject: Re: Extracting useful data from your OBDII port
PostPosted: Wed May 31, 2017 11:58 pm 
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Joined: Thu Dec 15, 2016 3:03 am
Posts: 73
Nice!

Looks like it is coming along nicely.

I've been considering purchasing the other app for a while, but the price and the uncertainty of whether it would work with my chinese OBDII thingy ** has not been able to commit me to it.

** I have not been able to replicate anko's results when querying the odbII with custom messages. MY dongle seems to return only the first line of the multi-line message the ODBII sends back. I played around with several AT commands, but I assume it's a limitation of the chinese thingy.

Let me know if I might be of any help.

_________________
Outlander PHEV (Instyle 2016 - GG2WXDHHZL6)
Titanium Grey


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 Post subject: Re: Extracting useful data from your OBDII port
PostPosted: Thu Jun 08, 2017 1:35 pm 
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Joined: Fri Feb 10, 2017 2:22 am
Posts: 74
Location: Lisbon, Portugal
Hey, thank you for the feedback guys.

Project is going pretty well.

App is able to retrieve data from the engine, generator, battery, front/rear motor and onboard charger control units.

It's also able to do some stats calculation for each recorded trips.

Image

I'm actually using on my daily trips and I've figured that my regen/consumption ratio is generally about 1/3...

I'll be soon starting a separate topic to post the app, anyone who's interested... be ready! ;)


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 Post subject: Re: Extracting useful data from your OBDII port
PostPosted: Thu Jun 08, 2017 10:13 pm 
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Joined: Mon Dec 01, 2014 11:30 am
Posts: 3188
Location: Netherlands, Utrecht area
Looks real nice!

What is your refresh rate?

GreyBigFoot wrote:
I'm actually using on my daily trips and I've figured that my regen/consumption ratio is generally about 1/3...

I guess you mean in parallel mode your engine is on 2/3 of the time and off 1/3 of the time? Or do you mean something else?


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 Post subject: Re: Extracting useful data from your OBDII port
PostPosted: Fri Jun 09, 2017 2:19 am 
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Joined: Fri Feb 10, 2017 2:22 am
Posts: 74
Location: Lisbon, Portugal
Thanks anko, I must say only possible due to your extensive efforts ;)

I'm waiting half a second before issuing the next run cycle. Each run cycle runs a list of commands requests/responses.

Not every command runs on every run cycle. For example, the request to the on board charger has a 1/10 ratio, which means it will run once on every 10 run cycles.

Priority commands like torque, RPMs and speed are running with a 1/1 ratio. Battery management unit request is 1/2.

So the refresh rate (run cycle) should be something between halt to one second.

I'm planning to make the refresh rate configurable as I suspect some chinese obd adapters won't handle well an high demand of data.

Some cool features of this app are the stats I'm adding to it, one being looking constantly at the SOC charge level and accumulating increases (Regenerated) and decreases (Consumed).
What I'm a seeing with my style of driving (pure EV) is roughly about 1/3 of regeneration of the SOC charge consumed (For example, Consumed = 25Ah, Regenerated = 8Ah)...

Let me know any other stats you would like to see, I'll look into it.

Oh, and I do have some questions for you too...

Still not sure about front/rear motor control units addresses... Is it 753/754 for front and 755/756 for rear, or the other way?

I'm seeing really high readings for the torque motors, for example:

754 10 23 61 02 28 12 51 6F => (28 12) - 10000 = 258Nm
756 10 23 61 02 28 2D 52 EE => (28 2D) - 10000 = 285Nm

I've seen at a time, a figure above 1000Nm... :s

Finally, I'm still missing the odometer reading, which is crucial for calculating part of the trip stats.

Not part of the standard PIDs, maybe hidden in mode 9? Have to look into that.

Thanks!


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 Post subject: Re: Extracting useful data from your OBDII port
PostPosted: Fri Dec 08, 2017 5:05 am 
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Joined: Mon Dec 01, 2014 11:30 am
Posts: 3188
Location: Netherlands, Utrecht area
Did another short video on how fast my own little OBDII solution is:

https://youtu.be/jreXchYlOSM

Top left corner shows power flowing into (+) or out of (-) the battery. This video is playing at actual speed ;-)


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