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Topic Review (Newest First)

  • 03-22-2017 07:10 AM
    gecd
    Very interesting topic.
    Sorry GM does not allow to increase charging 6.6 kW
    My friend has a second battery, and he charges two batteries through one connector

    https://www.drive2.ru/l/456998265263541164/

    Attachment 131801
  • 03-20-2017 11:30 PM
    Fred_B
    (yet another engineer here)

    This thread brings to mind the phrase:

    "What could possibly go wrong?"
  • 03-20-2017 11:11 PM
    nedfunnell
    Quote Originally Posted by GeV View Post
    @nedfunnell:

    It seems pretty obvious (to me at any rate) that you've given this much more thought, and have better comprehension of your intents and proposed implementation, than most if not all of the other contributors to this point in the thread.

    Unless user WopOnTour joins the discussion, I think you may well be the most knowledgeable person on this subject who's posting here.

    So while this is a good place to ask your question, I don't expect you to get very high-quality responses that go beyond what you've already gleaned on your own (unless and until WOT joins the discussion).

    Personally, although this mod definitely isn't for me, I am curious to hear more about your efforts. The Volt has been available for almost 7 years now, it's about time we get some competent tinkerers who are willing and able to push the car beyond it's design limitations.
    I think you're right. I doubt I'll make much progress on it by myself, so I'll keep looking for other places to connect with people who can chip away on the project.
  • 03-20-2017 10:37 PM
    Steverino
    Quote Originally Posted by mikeg3 View Post
    Please point me to the thread on this board of anyone who claims to have changed any code except table values in a Voltec system.

    I don't say it can't be done - any code created in 2010 can be hacked in 2017 - I just say that no one has done it.

    As for externally charging or discharging the HV battery without the battery management system detecting it, you obviously don't believe in redundancy. There would be fault codes in seconds.
    To the modders that just sounds negative.

    So my response is: "Great! Go for it. Please post pictures and the step-by-steps for adding the 6.6kW charging to your Volt." There are many who would be interested in doing the same. When does this Volt 6.6 project start?
  • 03-20-2017 08:32 PM
    mikeg3
    Quote Originally Posted by Fourdoor View Post
    Good luck finding a tuner who knows Volt code that hasn't left this forum in disgust due to the bad attitude of the many "enlightened" volt owners here.

    Keith
    Please point me to the thread on this board of anyone who claims to have changed any code except table values in a Voltec system.

    I don't say it can't be done - any code created in 2010 can be hacked in 2017 - I just say that no one has done it.

    As for externally charging or discharging the HV battery without the battery management system detecting it, you obviously don't believe in redundancy. There would be fault codes in seconds.
  • 03-20-2017 05:09 PM
    canehdian
    I would think the simplest route would be to find a higher powered charger that fits in the space of the existing 3.3 unit (they probably exist by now as electronics get smaller over time) and build the aforementioned translation unit to make the car thing it is talking to the original lear unit (serial # 123467) and everything is A-OK

    From what I can gather of the 240V charging process, the car just says "Hey, charge time" to the lear unit, it does it's job and then sends a message back to the main computer "I'm done". I know this because it always defaults to 83.5% SOC when charge complete happens. This means it's a programmed response vs a measurement. It will update to a measured/calculated SOC at a later time.
    There is likely no monitoring of kW rate or anything of that sort.
    The computer is only involved in 120V charging as part of the 8A/12A limiting process.
  • 03-20-2017 02:55 PM
    Fourdoor
    Quote Originally Posted by mikeg3 View Post
    There have been several "tuners" on this board claiming that they can modify a Volt. Every one of them only talks about improving acceleration, particularly 0-60 time.

    No "tuner" has even claimed to use more of the battery's total capacity, improve the charging rate, or do anything else involving the battery. Either they have no idea why people buy Volts in the first place or they only know how to change some tables, not code, through the bus.

    I wonder if these guys offer Corvette tunes that just improve the mpg.
    Don't conflate why YOU purchased a Volt with why "people" buy Volts. This anti "tuner" attitude is infuriating.

    And yes, tuners DO offer Corvette tunes specifically to improve the mpg... why on earth wouldn't they do this? Oh, right... tuners are neanderthals that are hell bent on destroying the earth, I forgot!

    I purchased the Volt for 2 reasons. I love the quiet comfortable driving experience of an electric drivetrain, and because I hate waste of any kind. Driving a high powered aftermarket tuned turbocharged 300 HP Miata on the weekends is a blast, driving it as a daily driver commuter car is a waste...

    Now back on topic, I don't know of anyone working on the Volt to increase battery charge rate, but twright is probably on the right track pointing you towards people that have used the Volt charger in a custom configuration on different vehicles. Good luck finding a tuner who knows Volt code that hasn't left this forum in disgust due to the bad attitude of the many "enlightened" volt owners here.

    Keith
  • 03-20-2017 01:39 PM
    GeV
    @nedfunnell:

    It seems pretty obvious (to me at any rate) that you've given this much more thought, and have better comprehension of your intents and proposed implementation, than most if not all of the other contributors to this point in the thread.

    Unless user WopOnTour joins the discussion, I think you may well be the most knowledgeable person on this subject who's posting here.

    So while this is a good place to ask your question, I don't expect you to get very high-quality responses that go beyond what you've already gleaned on your own (unless and until WOT joins the discussion).

    Personally, although this mod definitely isn't for me, I am curious to hear more about your efforts. The Volt has been available for almost 7 years now, it's about time we get some competent tinkerers who are willing and able to push the car beyond it's design limitations.
  • 03-20-2017 08:49 AM
    twright
    There are a group of people that have used the Lear charger that is installed in the Volt to charge the batteries in their DIY electric cars. They have uncovered a wealth of info on this product. Some of it may help you. Here is their forum: http://forums.evtv.me/?forum=395914

    You'll have to sign up to get access, but it's pretty painless.

    Good luck on your quest.
  • 03-20-2017 07:48 AM
    llninja
    Quote Originally Posted by nedfunnell View Post
    Also an engineer here.

    I don't think we need to worry about the BMS. You're positing that the BMS will tell the original charger to scale back because it will detect extra AC input current flowing, right? I think that can be managed simply. Since the J1772 inlet and wiring will need to be replaced anyway, any monitoring hardware that the BMS may or may not monitor simply remains on the AC lines feeding the original charger, and nothing is wrong. For the second charger, a separate microcontroller handles EVSE-facing J1772 communications and feeds translated inputs to the onboard J1772 logic. Not too hard. Upstream from this, the second charger taps the incoming AC power.

    On the topic of the BMS, I think the primary legitimate concern is if the BMS will produce and error when it sees more DC current coming in than usual. This may well be a problem, but I tend to think it won't. The BMS isn't sentient, and will only error out if GM programmed it to do so. And why would they? It'd be a waste of code. The charger likely has overcurrent protection, and that is sufficient for charging. The battery handles much higher currents regularly and there is no common AC charging overcurrent fault that GM engineers would create an error code for. Still possible, but I doubt it.
    I think doubling the current coming into the volt with two separate EVSEs will likely fry the batteries or at a minimum shorten the lifespan of the battery. But you'd have to hack into a bunch of code that nobody really has cracked AFAIK. A few years back someone found a higher capacity charger online and was wondering if they could upgrade the onboard charger with this higher capacity one. That became a dead end.

    To date, I think the only solution for charging faster is to trade the volt in for a different vehicle. I personally don't need faster charging as much as I would love a 100 mile battery with my range extender. More cargo space is also pretty high on my list as the volt is the smallest vehicles I've ever purchased for myself (I did have a Toyota Supra which was about the same size, yet 2 doors, but my Dad gave that to me).
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