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Discussion Starter #1 (Edited by Moderator)
I have stumbled upon a hold/ recharge type mode on MY2012 Volt. I been playing with the diagnostics of the Volt and figured out how to force start the engine in CS/ Recharge mode via computer and MDI module. I have been using this mode the past few days on my long hr+ highway trips. So far it does seem it is holding charge but while stopped/parked engine runs at idle, charges battery, and does not turn off automatically as it does in CS mode. I am looking to possibly have a developer make an app on android and use the Obdlink MX adapter to send the commands manually. This is just a proof of concept until I can reverse engineer the OBD2 commands to start engine through bluetooth instead of PC.

Here's proof

https://youtu.be/8wOi2aAnsMc
 

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Good detective work!

That sounds like a hybrid between hold and mountain such that it keeps running at idle.
It might be that elusive 'hold+recharge' mode that people have been asking for.

If you have access to a 2013+, you could log the CAN bus while switching to hold and see what kind of differences there are between your method and the GM-programmed method.
 

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Must be a late model '12 since my '12 doesn't have the center console screen (My Link?) shown in the video.

Still, if it works for my '12, I'm all for it. Congrats.
 

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I am looking to possibly have a developer make an app on android and use the Obdlink MX adapter to send the commands manually. This is just a proof of concept until I can reverse engineer the OBD2 commands to start engine through bluetooth instead of PC.
I can do this as we may be wanting to do something similar. I design IOS and Android apps (not my primary job) and have done a lot of CAN work on the Prius. I don't use bluetooth but do use wifi for all of my connections between the smart phones and the device installed inside the car. No access to a Gen 1 Volt though.
 

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I see in the photo that AER with a full battery is 26 miles and that the current trip of 0.6 miles used 1.6kw-hrs and 0.17 gallons for 3.5mpg. How should those numbers be interpreted?

KNS
 

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Discussion Starter #6
I see in the photo that AER with a full battery is 26 miles and that the current trip of 0.6 miles used 1.6kw-hrs and 0.17 gallons for 3.5mpg. How should those numbers be interpreted?

KNS
1.6kw was used for the heater while in park and charging lvl2. I used .17 gallons turning the engine on and off hitting the accelerator to see of it ramps up charging output ect. I only went down the street to make the video I would not rely on any of these numbers on the charge screen.

I am leaving to do a hr drive soon and I will be enabling the motor on a full charge and see how it goes and take a pic again of the center stack.

Also it is a 2012 not a late 2012 I added the mylink swapping head units.
 

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Tire pressure low 17psi
 

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TBH, I'd rather have a physical switch. I often have an OBD device plugged in and it's not a good idea to have multiple devices connected.
 

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Discussion Starter #9
I accidentally left the heater on at the gas station filling up used .5kw on heat. The kw counter goes up .1 everytime I stop and restart the engine. There was some kw usage on the highway I've yet to pinpoint why, probably due to heavy load (lead foot). When I turned the motor off still had full charge.
 

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Discussion Starter #11
Does the engine run at a steady speed, or vary when driving, and/or vary when sitting still and depressing the pedal?
the engine varies in RPM while driving depending on load, once you start slowing down or come to a stop it goes to idle, and it varies while parked hitting the pedal.
 

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I have stumbled upon a hold/ recharge type mode on MY2012 Volt. I been playing with the diagnostics of the Volt and figured out how to force start the engine in CS/ Recharge mode via computer and MDI module. I have been using this mode the past few days on my long hr+ highway trips. So far it does seem it is holding charge but while stopped/parked engine runs at idle, charges battery, and does not turn off automatically as it does in CS mode. I am looking to possibly have a developer make an app on android and use the Obdlink MX adapter to send the commands manually. This is just a proof of concept until I can reverse engineer the OBD2 commands to start engine through bluetooth instead of PC.



What software and OBD interface did you use, I have been through everything with my HPTUNERS setup and I can't simulate this at all.
 

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Discussion Starter #14
I have stumbled upon a hold/ recharge type mode on MY2012 Volt. I been playing with the diagnostics of the Volt and figured out how to force start the engine in CS/ Recharge mode via computer and MDI module. I have been using this mode the past few days on my long hr+ highway trips. So far it does seem it is holding charge but while stopped/parked engine runs at idle, charges battery, and does not turn off automatically as it does in CS mode. I am looking to possibly have a developer make an app on android and use the Obdlink MX adapter to send the commands manually. This is just a proof of concept until I can reverse engineer the OBD2 commands to start engine through bluetooth instead of PC.


What software and OBD interface did you use, I have been through everything with my HPTUNERS setup and I can't simulate this at all.

I used a GM MDI and GDS2 software. Now I am working on capturing the messages that controls the module to turn on and off the engine. Also you can force the engine not to turn on even if the battery range goes to 0 and switches over to gas icon on the dash. I did this last night, I got reduced propulsion message on the dash, and the car crawled to a stop once it depleted the buffer. Once I released control the engine turned on and was racing to build back the buffer. Hard lower SOC limit is 15%.
 

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Can you set it so that, on demand, you can make the engine just run continually at its quietest set point (I think it is 1700rpm??) and generate a steady constant stream of power?

I would pay for that!
 

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Discussion Starter #17
Can you set it so that, on demand, you can make the engine just run continually at its quietest set point (I think it is 1700rpm??) and generate a steady constant stream of power?

I would pay for that!
This mode almost does just that. it turns on the engine regardless of SOC, charges battery while not under load at low RPM. Engine ramps up as you hit the accelerator driving or parked. It does produce power until it hits the upper SOC limit of the battery which is 88%. What I do not know is if it can charge a depleted battery to fully charged. I just finished getting this to work on android today I am still testing obd2 timing, initialization, and keep alive messages.
 

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Sounds more like HOLD.

What I am after is a mode where it runs at its lowest set point so that, for example, on a long run the engine will deliver a bit of the traction power and the battery delivers a bit, and so the battery depletes but at a slower rate.

This would be the most efficient way of operating the engine on a long run. it's also be the quietest.

I don't really get why GM engineers didn't make this mode available.
 
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