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Open Vehicle Monitor System (OVMS) - Technical Discussion

Curt

Roadster Signature #55
May 13, 2013
432
178
Rockville, MD
Mark,

I was finally able to load v2.5.5 last night, and the ACC features seem much more stable now.

It looks like Cooldown was doing the right thing (though it's hard to be sure, since the battery was already at 14C when I got home), and unlike 2.5.3, it successfully returned the charging mode to Standard.

Also, Chargeby worked correctly, and made a pretty good estimate of the time to start, so it was done at the time requested. No problems with timezone offset this time, either.

Many thanks!
 

markwj

Moderator, Asia Pacific
Apr 10, 2011
4,620
1,257
Hong Kong
Mark,

I was finally able to load v2.5.5 last night, and the ACC features seem much more stable now.

It looks like Cooldown was doing the right thing (though it's hard to be sure, since the battery was already at 14C when I got home), and unlike 2.5.3, it successfully returned the charging mode to Standard.

Also, Chargeby worked correctly, and made a pretty good estimate of the time to start, so it was done at the time requested. No problems with timezone offset this time, either.

Many thanks!

Good to hear. Overall, the bugs seem out. Tom and I are working on tuning charge time prediction (ok, Tom is doing the work, but I am there for him :), but it seems pretty accurate for me. Just leave a 15-to-30 minute safety margin in there.
 

markwj

Moderator, Asia Pacific
Apr 10, 2011
4,620
1,257
Hong Kong
Sharing Data Publicly - Public Charges

I’ve always been interested in the possible uses of OVMS for the greater good of the EV community, and to assist with the widespread adoption of Electric Vehicles. The anonymised Tesla Roadster charging records we provided to Tom Saxton for his work on a Charge Time Predictor for these cars showed how beautifully such information sharing can work.

One big target for me has always been the sharing of information on public charge stations. Most of these systems are walled gardens at the moment (either for the charge station network or for the vehicle manufacturers), and there seems to be very little sharing going on. Chargepoint know when you start to charge, when you finish, the result (completed successfully or interrupted), volts, amps, etc - but not SOC% or which vehicle was actually being charged (just the owner). Leaf Carwings presumably knows where you charged, and the result, per vehicle, but has no way of sharing that with charging station networks. You can use Recargo to find a charging station, but have to manually go in and enter the charge result (if you want to feed-back positive/negative reviews to Recargo for the benefit of other users). The end result is a wallet full of charging network membership cards, RFID tags, and a cellphone full of Apps for all the different networks. Over time this will resolve itself, but for the moment it is a mess.

Open Charge Map goes a long way towards opening the charging station information, but the information seems to be flowing out of OCM to others, but not necessarily the other way.

Well, it turns out that for OVMS at least, we have a possible solution. A solution that can be both charging network and vehicle agnostic (at least for the vehicles supported). The rest of this eMail outlines my ideas for how this could be implemented. Think of it as an old-fashioned Request For Comments, and let me have your feedback.

Thanks, Mark.

Sharing Public Charge Data

The Problem

To allow OVMS users to automatically and simply share their usage of public charging stations. The information shared would be openly available to charging networks, charge station databases, apps, researchers, and other interested parties.

Pre-Requisites

Participating users would be required to have OVMS installed in their vehicle, and for the vehicle to be supported in as much as it can provide to the server indication of location, charge start, and charge completion events. Users would also require a cellphone app for authorisation and control of the sharing of their data.

Licensing

The data produced should be licensed in some ‘open’ way. Do with it as you will. Perhaps creative commons, or something similar.

Vehicle Firmware Changes

Specific messages for “Charge Start” and “Charge Completed” should be created and sent to the server at the appropriate times. Control of this can be in the common vehicle.{h,c} code, and is not hard to implement. Only the ‘last’ charge is required, and the normal historical data interface can be used.

App Changes

The Apps (Android and iOS) would require a mechanism for the user to opt-in to the scheme, and for that opt-in to be either anonymous or with a user-defined nickname. The opt-in is per-vehicle and the default is for all vehicles to be opted out. When the App connects to the server, it will inform the server as to the opt-in status.

The Apps will occasionally receive push notification messages from the server, at the start of a charge. Those messages will lead to a dialog for the user to confirm what he would like to do with the current charge:
a) Always shared charging information for this location
b) Share just this once charging information for this location
c) Do not share this one charging session for this location.
d) Never share charging information for this location

If the choice is made to share, additional information can be provided (such as the charging post number, comments, etc). It would be nice to include information from Open Charge Map at this point (such as the name of the charging station, and validation of the charging point number), but we will need to verify licensing and other considerations (such as whether this would be acceptable / desirable to Open Charge Map).

The Apps will occasionally receive push notification messages from the server, when charges are aborted. Those messages will lead to a dialog for the user to confirm the reason for the abort:
a) Charge was successful, but interrupted by the user
b) Charge was unsuccessful, due to a problem with the charging station
c) Charge was unsuccessful, but not a problem of the charging station.

The user’s response must be returned to the server appropriately.

The Apps, when connected to the server, can also receive a list of charging records that have not yet been responded to. A dialog should be presented to the user for each such location.

Server Changes

The servers will maintain opt-in status for each vehicle in the system, and if opted-in, the nickname / anonymous handle for the vehicle.

The servers will maintain a historical list of charging locations for each vehicle in the system. Each location record would have:
a) Latitude, Longitude (geofenced).
b) Sharing flag (pending user, just this once, always, not this once, or never).
c) Charging information (date/time charge started, etc).
d) Date and result of last charge here.

When the server receives a ‘charge started’ message from the vehicle, it would look up the geofenced location in the database, for the vehicle, and use the sharing flag to determine what to do.

If there is no matching record found, a new record would be created (sharing flag: pending user).

When the server receives a ‘charge completed’ message from the vehicle, it would look up the geofenced location in the database, for the vehicle, and use the sharing flag to determine what to do.

If the sharing flag indicates that the charging information should be shared, the server would publish the charging session information appropriately.

If the server receives an indication from the car that a charge has been aborted, it will have to PUSH notify the user - but also ask the user for confirmation of the reason why the charge was interrupted.

When the server receives a user decision message from an App (either before or after charge completion), it should update the charging location record appropriately. This may also result in the publishing of the charging session information.

The server will maintain a database of partners, and their API access keys. This database should allow for PUSH messages (via HTTP) to the partner. If PUSH is enabled, every time a charging session is updated (either started or completed), the server will connect to each partner (in randomised order) and send them the information for recent charges. The server will also provide an API to allow partners to PULL messages past a certain date/time stamp (to allow for periodic synchronisation).

Partners

Partners would just have to subscribe to the system (signing up with a user account and being given an API key). They would have to agree to the license terms, but other than that there would be no restrictions to partnership.

Partners can choose to either retrieve updates via PUSH (they provide a server URL to receive the data), PULL (they periodically poll the OVMS server for updated data), or a combination of both.

Overview (start to finish)

An OVMS user opts in to the service. He uses the nickname ‘Jimbo’.

He arrives at a public charging station and plugs in. The OVMS module in his car detects the charge has started and informs the server. The server looks up the vehicle charging locations and finds that the vehicle has never charged here before, so sends a PUSH notification to the user’s Apps to ask him about this charge.

Within seconds of the charge starting, the user’s cellphone beeps and he sees an OVMS notification. He clicks on it and is taken a dialog asking him about the charge he has just started. This is a public charge station, so he just clicks “Always share charging information for this location” and turns off his phone. The App sends a notification to the server, and the server updates its records to never both the user about this location again. The server also updates all partners (via PUSH notification) that a charge has started at this location.

Partners can use this information to record statistics on charge station usage, or even as a rudimentary indication of if the charging station is in use (at least by an OVMS user).

After a few hours of charging, a breaker trips and the charge is interrupted. The OVMS module in his car detected the abort and informs the server. The server looks up the vehicle charging location, and if sharing is enabled for this location sends a PUSH notification to the user’s Apps asking him about the cause of this interruption?

The user returns to his car and finds the problem. He responds to the dialog in his OVMS App to let the system know that the charge was interrupted by a problem of the charging station. The server receives the response, updates its records, and updates all partners (via PUSH notification) that a charge has been interrupted at this location.

Partners can use this information to record statistics on charge station failure rates, as well as updating that the charge station is no longer in use.

Partners not using PUSH notifications can retrieve all this information at a later date by a simple HTTP PULL request.

Further work

There are many extensions possible to this system, but I would first of all like to concentrate on getting a basic implementation designed and implemented, and some partnerships in place.

For example:

* Pictures of new charging locations.
* Information for new charging locations.
* Charging station information.
* Showing current usage of a particular station in the Apps.
* and so much more

Privacy Issues

The biggest privacy issue is that the server would have to record the locations of charging stations that the user has requested not be shared. For example, someone’s home. We could avoid this by not recording these, but that would not be optimal as the system would then have to ask the user whether he wanted to share, each and every time they charged at that location (rather than just once, the first time). As this information is not actually shared, it is not a true privacy issue - but should the security of the server be compromised, that data could be exposed.

Perhaps a one-way hash could be used for storing locations, but we would have to find one that also worked with geofenced lookups.

Conclusions

The above is not hard. In particular, the vehicle firmware changes are trivial (it could even be done without any vehicle firmware changes, by looking at the S and D messages coming back from the cars). The server code is not difficult at all. The largest amount of work would be in the Apps (in particular, handling the PUSH notifications and user dialogs).
 

PV1

Member
Aug 28, 2013
56
19
Pittsburgh
Hello, all.
I received an OVMS for Christmas, and today I set it up in my Mitsubishi i-MiEV. I know that this is a Tesla forum, but the i-MiEV forum is rather quiet on this device. Is there anything special to set up on it to let it hear what my car has to say? When I query with STAT?, I get:

Not Charging
SOC: 0%

This is when the car is off, on, and charging. The car has about 1/2 a charge, and I know the CANbus broadcasts SoC.

According to the lights on boot, it is firmware version 2.5.5. Since I'm waiting for my account to be approved on openvehicles.com, I have my GPRS switch off. V2 hardware.

Thank you for your help.
 

markwj

Moderator, Asia Pacific
Apr 10, 2011
4,620
1,257
Hong Kong
Hello, all.
I received an OVMS for Christmas, and today I set it up in my Mitsubishi i-MiEV. I know that this is a Tesla forum, but the i-MiEV forum is rather quiet on this device. Is there anything special to set up on it to let it hear what my car has to say? When I query with STAT?, I get:

Not Charging
SOC: 0%

This is when the car is off, on, and charging. The car has about 1/2 a charge, and I know the CANbus broadcasts SoC.

According to the lights on boot, it is firmware version 2.5.5. Since I'm waiting for my account to be approved on openvehicles.com, I have my GPRS switch off. V2 hardware.

Thank you for your help.

You'll need to make sure you have experimental firmware (Mitsubishi iMiev support is not production yet) and vehicle type set to MI.

Probably best to ask on the ovms developers mailing list.

Regards, Mark
 

PV1

Member
Aug 28, 2013
56
19
Pittsburgh
Last edited:

Saftwerk

Member
Nov 20, 2012
24
0
Bavaria
View latest data from OVMS Server on PC

I would like to see a simple new feature: View latest data from OVMS Server

OVMS View Status.png


I'm even happy, if I could see only some raw text data from the database: e.g. SOC, charging, mode, etc...
This would be a very nice feature to SMS-only-Users.

Thank You!
 

Curt

Roadster Signature #55
May 13, 2013
432
178
Rockville, MD
This is a new behavior...

OVMS (running v2.5.5) is reporting my Roadster battery temperature as 483 degrees F.

I guess I'd be more concerned if I couldn't see the thick layer of ice over the ESS, and that the motor and PEM are at 32F and 35F. Is this an error due to negative (Celsius) temperature?
 

Mitrovic

Member
Dec 30, 2010
674
93
Bern, Switzerland
I’ve always been interested in the possible uses of OVMS for the greater good of the EV community, and to assist with the widespread adoption of Electric Vehicles. The anonymised Tesla Roadster charging records we provided to Tom Saxton for his work on a Charge Time Predictor for these cars showed how beautifully such information sharing can work.

One big target for me has always been the sharing of information on public charge stations. Most of these systems are walled gardens at the moment (either for the charge station network or for the vehicle manufacturers), and there seems to be very little sharing going on. Chargepoint know when you start to charge, when you finish, the result (completed successfully or interrupted), volts, amps, etc - but not SOC% or which vehicle was actually being charged (just the owner). Leaf Carwings presumably knows where you charged, and the result, per vehicle, but has no way of sharing that with charging station networks. You can use Recargo to find a charging station, but have to manually go in and enter the charge result (if you want to feed-back positive/negative reviews to Recargo for the benefit of other users). The end result is a wallet full of charging network membership cards, RFID tags, and a cellphone full of Apps for all the different networks. Over time this will resolve itself, but for the moment it is a mess.

Open Charge Map goes a long way towards opening the charging station information, but the information seems to be flowing out of OCM to others, but not necessarily the other way.

Well, it turns out that for OVMS at least, we have a possible solution. A solution that can be both charging network and vehicle agnostic (at least for the vehicles supported). The rest of this eMail outlines my ideas for how this could be implemented. Think of it as an old-fashioned Request For Comments, and let me have your feedback.

Thanks, Mark.

This all sounds great to me! I would love to participate! I think that to make it really work, OVMS needs to be ready for as many EV's as possible. You see, my Zoe would love to have an OVMS, too!
 

markwj

Moderator, Asia Pacific
Apr 10, 2011
4,620
1,257
Hong Kong
I would like to see a simple new feature: View latest data from OVMS Server

View attachment 39772

I'm even happy, if I could see only some raw text data from the database: e.g. SOC, charging, mode, etc...
This would be a very nice feature to SMS-only-Users.

Thank You!

This is something we have been thinking about, but it is not easy to do. A web client based on the HTTP API would be a better approach, and something we have been considering.
 

Saftwerk

Member
Nov 20, 2012
24
0
Bavaria
saw bad data on Android App : 70A or 32A
TR2.5 Charge at 32A but showing 70A_.jpg

History: (all on same day ; OVMS Firmware=2.3.2)
1. charge at 70A with HPC at a location never charged before.
2. drive 100 km
3. charge at 32A with UMC at a location never charged before.
4. screenshot
The whole day I have never changed any Loading-Parameter (not with App and not with Roadster LCD screen)

Now I have updated to OVMS Firmware=2.5.5
Because I don't have the Android-Pad any more, I can't repeat this.
 

hrtchkr

Member
Nov 17, 2013
26
2
New York
I'm relatively new to the OVMS experience but am loving being able to monitor my car and tweak my charging status from my iPhone, and judging from the replies to this thread most users feel the same. There does seem to be one feature that doesn't get used much and that is the social groups. Maybe I'm misunderstanding the purpose of the feature, but it seems to me that geographically-related or interest-related roadster owners would want to be in some sort of contact with each other. Maybe they are and I'm just unaware of it. Does anybody know if there is a list of currently active social groups that are open for joining?
 

hjr

#1291
May 31, 2011
113
16
New Haven, Connecticut
I've been running version 1.5.1/V1 for a long time on my Tesla Roadster - I took a look at the updates and wonder what real benefit there is in updating given the phone app is still 1.3.7 ....

-Howard Reiter
 

markwj

Moderator, Asia Pacific
Apr 10, 2011
4,620
1,257
Hong Kong
I've been running version 1.5.1/V1 for a long time on my Tesla Roadster - I took a look at the updates and wonder what real benefit there is in updating given the phone app is still 1.3.7 ....

-Howard Reiter

The car module firmware and app version are not related.

We do publish a change log when new versions are released, and those list what is new / fixed. Biggest recent improvements are the logging and ACC (Advanced Charge Control) support.
 

supersnoop

Tesla Roadster #334
Mar 24, 2014
1,111
222
Pflugerville
I've been reading and searching and reading; and I'm stuck on this ACC feature.

At one point, I thought I read that it was only available on 2.x Roadsters, but I can't find any reference to confirm or deny that limitation. Should ACC work on a 1.5?

I know ACC requires Tesla Roadster specific firmware, but how do I know if I have that installed already? My OVMS reports the version as 2.6.5/TR/V2, but it will not respond to any ACC commands.
 

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