[Ovmsdev] Advanced Charge Control (ACC)

Mark Webb-Johnson mark at webb-johnson.net
Sun Jun 2 09:29:37 HKT 2013


My original design was 3 (home, work, other). I increased to 5 to allow for different schedules weekday / weekend, etc.

Lets see how it works out. More would be good.

Regards, Mark

On 2 Jun, 2013, at 3:02 AM, Tom Saxton <tom at idleloop.com> wrote:

> Mark,
> This all sounds great. It covers everything I want, and more. Personally, I
> think three zones is plenty if you want to save some parameter space.
>    Tom
> on 5/31/13 6:56 AM, Mark Webb-Johnson wrote:
>> I've spent some time planning this, and now have the time to try to get it
>> done. The observant will have noticed a new branch ACC just appeared in the
>> github repository.
>> This is primarily for Tesla Roadster owners, but once we work out how to do
>> charge control in other cars, it will have use for them.
>> The premise of what I'm thinking is a replacement for the limited charge
>> control in the car, to make an Advanced Charge Control:
>> We have the concept of a 'charge location'. This is an area (square, because
>> it is easiest) around a GPS location. An area of 200m x 200m, centred on the
>> charge location, should be sufficient for gps inaccuracies. Up to 5 such
>> charge locations can be defined (I'm thinking home, work, and one other).
>> Once the car enters a charge location, an action can be triggered. At the
>> moment, I'm only thinking of automatic home link activation, but others are
>> possible.
>> When a car is turned off, while in a charge location, acc is enabled and
>> current charge settings are saved.
>> When a car is turned on, while in a charge location, acc is disabled and
>> previous charge settings are restored.
>> Features that acc should support include:
>> Homelink activation.
>> Cooldown (cool the car using a sequence of low amperage range mode charges) -
>> this would need a minimum temperature (don't cool down unless ESS temperature
>> is above this), a desired temperature (cool down until the ESS reaches this
>> temperature),and a time limit (stop cooling down if we've been trying for too
>> long).
>> Charge mode (standard, storage, range, performance).
>> Charge current limit.
>> Various charge types, including:
>> Charge on plug-in
>> Start charge at specific time
>> Complete charge by specific time
>> Desired charge limit (SOC%, ideal miles/kilometers, or full)
>> In addition to the charge locations, acc should be able to be turned on,
>> one-off, for the current location. This should be done after the car is turned
>> off, before plugging in. It will be effective until the car is turned on
>> again.
>> It should also be possible to use this one-off acc to override the charge
>> control for the current location. This will be effective until the car is
>> turned on again.
>> Control, and status, is possible by SMS commands.
>> Control is also possible by a new tab added to the apps. I'm going to do
>> iPhone first, with the existing charge control moved to a new "Charge" tab.
>> I'm not sure how to do the 'specific time'. This could be
>> simple-to-ludicrously-complex. My inclination is to just put a day-of-week
>> filter on each charge location - with acc only being enabled if the day
>> matches. More than one location could be created for each physical gps
>> location, with different day matches, to control how that would behave.
>> Changes to be made include:
>> Move the roadster digital speedo experimental feature to a fully supported
>> features, and give it a permanent feature storage number.
>> Assign five new permanent parameters, one each for five charge locations
>> (home, work, other, or whatever they want to be known as - we just call them
>> #1, #2, #3, #4 and #5).
>> The parameter storage for these new locations includes the charging
>> preferences for each location.
>> We would also need a parameter for time zone.
>> Add a new module called "acc".
>> If "acc" detects we are at a known charge location, it will take over the
>> charge control from the car.
>> The "acc" will also support commands for the current location, and will be
>> able to take over charge control from now until the car is next driven.
>> Please let me have your comments / suggestions. I'll handle the coding, but
>> I'll need lots of help testing.
>> Regards, Mark.
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