Planing CanView and BMS+ conversion with lithium

Looks like V3plus is the only one which has instant DTC clear for Out-Of-Gas mode.

[FONT=Arial, Helvetica, sans-serif]The following codes are Beta test for the V3plus:[/FONT]

CAN=[FONT=Arial, Helvetica, sans-serif]C3feb052[/FONT]VIDEO=[FONT=Arial, Helvetica, sans-serif][FONT=Arial, Helvetica, sans-serif]V3apr298[/FONT][/FONT]IE=[FONT=Arial, Helvetica, sans-serif]CIapr296[/FONT]RELAY=[FONT=Arial, Helvetica, sans-serif]R3mar138[/FONT]
[FONT=Arial, Helvetica, sans-serif]On SETUP screen option "!DTC" now exists. If select YES then BMS screen has new button top left that does instant DTC clear for out-of-gas mode.[/FONT]

What about V4plus?

Looks like I will have to wait for a V4plus beta version.

 

Canview could display "out of gas". Because it is canview that clear the dtc, just before clearing, this dtc code could be read and stored. But this is more programming job for Norman.
He done the most important : direct acces to dtc clear.

 

The hybridinterfaces website infers that the DTC instantly clears after OutOfGas DTC after pressing DTC clear button. Does this mean that it will not clear all DTC codes. Or just the one particular OutOfGas DTC code.

I guess Norm will make a V4plus code with instant DTC clearing for OutOfGas mode, eventually. Since it is part of the setup screen I cannot see how it would be a problem to other users who will never use OutOfGas mode.

What would be cool if Norm could program so that the ICE was enabled after running OutOfgas mode without having to stop. But I very much doubt that this could be done. I suspect that this requires changes to the ECM.

 

There are different commands in order to clear dtc. One clear all dtc "at level 0". Some clear dtc in one ecu at a time.
Because you have only one touch, I suppose Canview use general clear.

 

In that case all Norm had to do was copy the DTC Clear button (which was always on the DTC page) to be also included onto the BMS+ page. Also make an addition to setup page to enable/disable DTC Clear button on BMS+ page. None of this requires any really hard programming, I would think. It is just convenient to not have to navigate between pages. Maybe the extra programming eats into the memory so a page has to be sacrificed to free up some memory.

 

Using a Elcon PFC charger 1500 watts.

The maximum voltage determines the voltage at which CV mode starts (72 cells x 3.65 = 262.8v). The charger will start charging when battery is usually depleted at around 2.5v x 72 cells = 180 volts. The charger will only put out a voltage just high enough above the battery voltage to inject a constant current of 6.2 amps until the battery reaches 262.8 volts and then begin CV mode charging. The time it takes for CV mode charging depends on the charge curve used.

So if you are controlling the output current then you are also controlling the output voltage.

So if you have the output current control pot (voltage divider) set for e.g. 4 amps. The charger will still put out a voltage just high enough above the battery voltage to inject a constant current of 4 amps which will take longer and so when the voltage reaches 262.8v it should still go into CV mode charging. So no matter what output current you have set the maximum voltage 262.8v will always be the same.

 

NORM ! your great

is is great so now you dont have to stop the car to clear the code?

if your in out of gas mode does this mean you can go back into gas mode with the press of a button?

hwo do you get into out of gas anyway? a switch to the fuel pomp?

that new config screen is new to me.. a touch screen button? so it wil make a sound when pressing the screen? the canview got no audio output?? i have the v4

 

ok so when i buy a charger of stock with a end voltage of 292 volts and nominal of 240 volts ( so 4 volts a cell max voltages what is to high ) even if i lower the current to 0.200 amps it wil still want to go to 292 volts.
but if i let the charger charge the cells to 292 and before that the cellog is stopping the charger of putting it in low current mode ( 0.2 amps ) my bleeding boards wil prevent the cells from overcharging.
so in that case my charge curve still is somewhat the same
only my current drop wil be a faster from max current to 3,65 volt a cell and then to 0,2 amps and 3,65 a cell..
does anyone see a problem with this? its not the preposed charge curve.

yesterday i charged up 2 cells with a RC balance charger
here are the info

end of charge ( cell 1 is a cell that i am using for testing of battery box build and cell 2 is the cell that was bent )
17:47 cell1 cell2
17:47 3,623 3,609 ( did not balance charge )
21:13 3,608 3,606
next day
22:22 3,608 3,604
08:00 3,598 3,598
12:29 3,598 3,598

cell charge voltage was 3,6 and startoff at 5,0amps and end with a long 0.1 amps

 

edit

 

i wonder today if the ICE ECU is setting this DTC and telling the HSD ECU thats there is a problem and the system wil not request ICE start.

what if you can just power cylce the ICE ECU during driving?

i dont now at this point out of my head if there is a ICE ECU but if its disabled because its out of gas you can maybe safely brake the 12volt to that ECU and back on, to power cycle it and have it try to start the ICE again.
?

 

FWD,

Consider your balance board current and top balance charge carefully. If you have a 200ma board, and 200ma charging, your cells will never get to full, since the balancers are burning all the current applied to them. Better to have 200ma balance board and 300ma current. That way one of your cells will eventually hit HVC and stop charging. In fact somthing more like 1a is better, since the balance board will continue bleeding for a few minutes after the charge cycle ends anyway.

 

when i have a charger thats stops at 292 volts then i wil overcharge that cell thats charging at 300ma but bleeding at 200ma to 4 volts
i can get a charger fast with a 240 nom and 292 max voltage this week or wait more then 3 weeks for a 237 and 262 charger..
with the 292 i can use it for future stuff like 76 cells like PIS systems
and the attached pdf shows a charger mod to adjust the high and low

 

FlanInaCupBoard

WFD want to use just bleeding individual cell. These won't manage the charger.
What you explain need a bms that will stop the charger when one cell goes over HVC. This is not the best balancing technic.
WFD need that the shunt amperage been highter then charger amperage.


Bleeding balancer have 2 voltages threshold. Low and High.
When one cell voltage reach high, shunt will be connected. If, for exemple, shunt drain 300mA and charger send 200mA, 100mA will come out of cell and this cell will slowly goes down to low voltage threshold. Then shunt will be set off and cell will receive 300mA one more time. His voltage will rise. And so on.
So all cells are protected from over voltage.
During this cycle, other cells voltage will goes up.
You can stop the charge when all cells have shunt on.

If HVC charger is too high, this will be a safety problem but charge could be stopped by a bms. Safety problem because if bms fail canceling charging and amperage is over the bms shunt ability, some cells will be overcharged (destroyed).

If charger HVC is a little too low, during balancing lowest cells will have to wait until others have shunt on. Because when a cell have his shunt connected, this cell voltage decrease. Because they are all serialy connected, at this moment lowest cells have more voltage and can go between low and high shunt voltage threshold.
You won't have all cells at high voltage threshold but all will be between low and high. If bms only need that all cells been betwen high and low, charging can be stopped.

If HVC is too low, of course no balancing. Charger can stop charging if his amperage is under a threshold.

@FlyingWhite

Elcon charger have maximum voltage. 258v or 320v for pfc 1500w.
258 or 290v for 2500w. They talk about nominal voltage. Don't know why ?? Lithium charging need cc and after cv.

The less is the max charger voltage, the max is his amperage.

 

Post moved to

http://priuschat.com/forums/prius-phev-plug-in-modifications/104914-elcon-charger-end-voltage-other-mods.html

 

o well

i wil get the to high charger and see what happens.
at first i wil keep monitoring the charge myselfs and not have it charge without me beeing near it and i use a timer

i have 9 cellogs to warn me and trip a relay so they need to fail al at the same time

i dont think there wil be a cell that reaches 3,8 volts where one other cell is stil ar 3,5 volts
in that case that cell at 3,8 is not good its to low on capacity and needs to be replaces i think.

i wil also temp monitor relay to chutoff th charger

and if this al seems not to work i can still make the charger adjustment voltages as pdf in my previous post.
i then stil have a charger that can be used for 76 cell if i would like to do so up to 80 cells possible with this charger.

mine got a max of 292 and not 320? its from a german supplier providing TC chargers en not elcon.

 

Lo

Why do you say 3.8v ?

Is your problem more because 3.6v (bms) is a little under the 3.65v (charger) ?

I suppose that your bms have two voltages threshold. Is 3.6v the lower or the higher ?

 

Post moved to

http://priuschat.com/forums/prius-phev-plug-in-modifications/104914-elcon-charger-end-voltage-other-mods.html