First drive of industrial ac hilux

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antiscab
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First drive of industrial ac hilux

Post by antiscab » Tue, 19 May 2009, 00:31

On my bike, ive set the regen on the rear wheel to be below what would be required in an emergency stop.
that way under "normal" stopping, you use rear brakes only. in an emergency stop, you use both.

on a car you would "back-off" the rear friction brakes, since you dont have independant explicit control over the front/rear braking ratio.

regen requires the wheel to be turning to work. so rather than an actual lock up, you might have the wheels turning slower than they should, kinda like a compression lock up. that only happens if the braking torque is set too high (and the controller may through an error, depending on what you programmed it to do in that situation).

Matt
Matt
2017 Renault zoe - 25'000km
2007 vectrix - 156'000km
1998 prius - needs Batt
1999 Prius - needs batt
2000 prius - has 200 x headway 38120 cells

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First drive of industrial ac hilux

Post by a4x4kiwi » Tue, 19 May 2009, 05:56

Regen is not that strong, and it has to be quite low with lead acid batteries as mine can only be charged at .3C.

If you have ever driven a diesel, when you let of the throttle you get engine breaking. It is no stronger than that so it doesn't upset the braking balance at all.

You can set it to be stronger, but that would be dangerous in the wet.
Silicon is just sand with attitude.

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First drive of industrial ac hilux

Post by a4x4kiwi » Tue, 26 May 2009, 00:32

The June Silicon Chip magazine has a 6 page article on the Electro-Lux.

http://a4x4kiwi.blogspot.com/2009/05/ar ... licon.html

I even get my mug on the cover.
Last edited by a4x4kiwi on Mon, 25 May 2009, 14:33, edited 1 time in total.
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First drive of industrial ac hilux

Post by Electrocycle » Tue, 26 May 2009, 02:39

good stuff!
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acmotor
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First drive of industrial ac hilux

Post by acmotor » Sun, 30 Aug 2009, 20:13

Mal, is the battery you drilled into (to access 2V cells) part of the main pack now ? I would be interested to know how the intercell balance is going as the battery ages.
Have any greensaver batteries given problems ? Were these single cell issues or whole of 12V battery ? S/C or O/C cells ?
End cell or middle cell ?
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Post by a4x4kiwi » Wed, 02 Sep 2009, 18:44

I have replaced 2 batteries so far (about a month ago) as they were below the rest of the batteries after a partial discharge. I just drilled into the 2 failed batteries to measure the voltage at the interconnects between the cells.

5 of the cells were at 2.2 volts and one was at 1.9 in both cells.
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acmotor
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Post by acmotor » Wed, 02 Sep 2009, 19:03

Are you able to measure these cell voltages during a charge or discharge on the bench ? i.e. establish internal resistance for the cells.
Can you weigh the batteries accurately and compare with a newer battery ? (manufacturing tollerance may hide changes though)
What I am looking for is have the cells dried out at all.
Maybe remove the vent cap and insert 10ml of distilled water ?

Can you directly charge the low cell in an attempt to recover ?

Sorry, just thinking out loud ! Image
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Post by Johny » Wed, 02 Sep 2009, 19:12

While we are asking questions - what distance have you covered now Mal?
(Really I'm interested in how many cycles you are up to).

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acmotor
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Post by acmotor » Wed, 02 Sep 2009, 19:25

Oh, and the cell that failed, was it an end cell ?
If so, any sign of physical damage from the outside ?
...and where was the battery placed electrically and physically in the pack ?
Were they in the same 48V module ?

More questions, but we are interested ! Image
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Post by a4x4kiwi » Sun, 06 Sep 2009, 17:10

You don't half ask the detailed questions. :)

I will answer the ones I can...

@Johny about 1600km. Not much, but I don't drive far each day.

@Tuarn. One was an end cell, one was the 1st one in. No physical sign of damage. From memory, one was 3 batteries from the +300 terminal and the other was 6. Both were from the 2nd row inside the side of the pack. They ware in different 48v modules.
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acmotor
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Post by acmotor » Sun, 06 Sep 2009, 18:32

Thanks for that detail Mal, it is all part of completing the picture !

No pattern from that detail.

Oh, did you say the faulty cells were o/c or s/c ? and what was internal resistance of faulty cell and others in same battery ?

Were you able to look at the water/weight/forced recharge of cell ? No pressure here !! Image

If a cell went s/c then it is possible it was reversed on high DOD ?
Given the system can't draw much over 3C that the batteries are manufacturer rated for (3C cont. for 8minutes !), It is not likely the cells failed from discharge rate.
A U/V monitor at the battery level may be required ?

Did you confirm the zener BMS are all still functional ?
Just thinking with keytops here !

....Or there were just a few manufacturing faults.
2 in 288 that sort of thing.
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