Imac&c hch1 civic

[retepsnikrep]

I bet button MTBF lifetime is minimum 100,000 but closer to a 1,000,000 clicks.
It will be in the switch data sheets.

[retepsnikrep]

Matt asked a few months ago to consider adding a 12v aux load balancing mode for the first regen click instead of the set 5% regen level which tries to do the same thing but in a somewhat cruder fashion.

I've looked at my captured data and have added some code to hopefully accomplish this and I'll try it in next few days.

So the first regen click will basically act like the car normally does to have no current flow from or to the IMA battery. If it works this will be a much neater solution and allow the prevention of ABC whilst maintaining suffcient regen to ensure the IMA battery is neither charged or discharged.

I hope that makes sense.

[samwichse]

So the first click will now be sensitive to the load on the dc-dc so instead of having anywhere from 3 amps with no load to -0.4 amps with headlights + fan + rear defrost, it should basically stay around 0 amps?

Sam

[retepsnikrep]

Originally Posted by samwichse

It should basically stay around 0 amps?

Sam

That's the theory

[retepsnikrep]

I've loaded the new load balancing ABC (Automatic Background Charge) software and will try it tomorrow. It did not give any IMA errors when activated when idling on the drive so that's a good sign.

It will likely only work in situations when the regen is being requested by the MCM via the ECM.
So that is the ABC that happens when soc is below 60% but not less than 28% or so.

ASFAIK It cannot prevent the very low soc ABC that is commanded directly by the MCM when the battery is completely exhausted. But that will be confirmed by road testing.

The reduced short button press <0.5s time works fine, so you can select max regen/assist 50% quicker now.

Just a heads up. If you activate assist at 2 clicks (50%) or above when the car is idling it will set a VSS CEL code. This is a quirk of the car and a very unusual situation that is unlikely to occur in real world use, as it's pointless sitting idling with assist activated. The code can be cleared in the normal ways. I doubt you will ever see it unless you accidentally activate assist at 50% or higher when stationery.

[retepsnikrep]

The code seems to work fine and the current quickly settles to 00.0A when activated despite what the ECM might be trying to command. .

So the first Regen click is now a proper disable assist/regen/abc setting! Confirmed by the OBDIIC&C current display.

[samwichse]

Odd about the VSS error, I did this a couple times (multiple clicks of assist at idle, up to 3) and never had any error?

Will test the new code in about an hour.

Sam

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[retepsnikrep]

The static assist has to be activated for several seconds for the VSS error to occur.
Just clicking assist up and then back down several levels quickly doesnt seem to cause it.

[samwichse]

Ah ok, I didn't let it wind out my engine more than a second or two.

Tested the new software, and it asked to work well. The zeroing of the amps in/out worked, but did seem subject to a but more 'roughness' than when the car is simply over 70% soc. Ie it had a little more bounce in the numbers (+0.2, -0.4)... but a big improvement overall.

Probably didn't help that I was playing with the headlights, turn signals, rear defroster, and heater fan all the time trying to mess it up.



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[retepsnikrep]

One thing I forgot to mention is that it also prevents the soc bleed off that occurs if you push the battery beyond 72% with forced charge etc.

i.e. If you charge to 80% or grid charge to 100% with the car powered up then the car will straight away start burning off that excess soc to get it back down to around 70%. It's easy to see this phernomena with the OBDIIC&C. The new mode prevents that

I tried the defroster and blower stuff as well. Basically the car is sensing that load and then the MCM is slowly adjusting the IMA output up/down until it zeros the amps. This takes a few seconds each time to find equlibrium as the load changes. It does what is says on the tin as far as I can see now.