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  #1  
Old 09-28-2009, 10:45 AM
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Default Re: [EVDL] Jumpy Pots

I've had the same Curtis pot box in my EV for at least 3 years,
possibly up to 14 years old (I bought the car previously converted and
used). Currently my pot box is inside a weatherproof enclosure:

http://picasaweb.google.com/lh/photo/sby8m0mJDgKUTfUMTvYoVA?feat=3Ddirectli=
nk

it still works smoothly for me on a Kodiak controller

-Jon Glauser
http://jonglauser.blogspot.com
http://www.evalbum.com/555



[quote] soundboats <xxx@xxx.xxx.gov> wrote:
>
> Hello, I am trying to find out if anyone has had any luck in finding
> potentiometers that do not degrade with heavy use. I have tried the Cu=
rtis
> PB-6, a Chinese copy of the PB-6, and the Logisystem potboxes. All have
> suffered from the same degradation over time and last no more than 6-8
> months in heavy city and suburban driving (about 100 miles a week in stop
> and go traffic). The Logisystems potbox lasted only 2 months, the Curt=
is
> about 8 months, and the Chinese copy has been in for 6 months and showing
> signs of degradation.
> Initially all the potentiometers have a steady increase in resistance with
> the movement of the arm. However, the pots become progressively =93jum=
py,=94
> making driving difficult. I have measured the resistance and find that=
any
> small movement of the arm makes the resistance go up much higher for seco=
nd
> and then come down to what it should be. For example, if I have the ar=
m in
> a position that provides 1000 Ohms of resistance and move it just a few
> degrees the resistance jumps to 2500 Ohms before coming back down to 1200
> Ohms. This type of jump occurs at any setting of the arm and is not re=
lated
> to the controller. I have measured this jump when the pot boxes are
> disconnected from the controller as well.
> So, I am trying to find out if there is a brand of potentiometers that do
> not have this problem. I have found out that the resistance in these p=
ots
> is provided by a piecce of plastic, and I wonder if the plastic degrades
> with use. Any help would be welcome.
> Thanks,
> Tom Hruby
>
> --
> View this message in context: http://www.nabble.com/Jumpy-Pots-tp25648568=
p25648568.html
> Sent from the Electric Vehicle Discussion List mailing list archive at Na=
bble.com.
>
>
> _______________________________________________
> General EVDL support: http://evdl.org/help/
> Usage guidelines: http://evdl.org/help/index.html#conv
> Archives: http://evdl.org/archive/
> Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
>
>

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  #2  
Old 09-28-2009, 10:45 AM
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Default Re: [EVDL] Jumpy Pots

Hi Tom,

Yup, pot boxes will do that.
The bests solution is to change over to Hall effect ones, if your controller
supports it. I have yet to see one of those degrade at all.

Matt

-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On Behalf
Of soundboats
Sent: Tuesday, 29 September 2009 12:32 AM
To: xxx@xxx.xxx.edu
Subject: [EVDL] Jumpy Pots


Hello, I am trying to find out if anyone has had any luck in finding
potentiometers that do not degrade with heavy use. I have tried the Curtis
PB-6, a Chinese copy of the PB-6, and the Logisystem potboxes. All have
suffered from the same degradation over time and last no more than 6-8
months in heavy city and suburban driving (about 100 miles a week in stop
and go traffic). The Logisystems potbox lasted only 2 months, the Curtis
about 8 months, and the Chinese copy has been in for 6 months and showing
signs of degradation.
Initially all the potentiometers have a steady increase in resistance with
the movement of the arm. However, the pots become progressively "jumpy,"
making driving difficult. I have measured the resistance and find that any
small movement of the arm makes the resistance go up much higher for second
and then come down to what it should be. For example, if I have the arm in
a position that provides 1000 Ohms of resistance and move it just a few
degrees the resistance jumps to 2500 Ohms before coming back down to 1200
Ohms. This type of jump occurs at any setting of the arm and is not related
to the controller. I have measured this jump when the pot boxes are
disconnected from the controller as well.
So, I am trying to find out if there is a brand of potentiometers that do
not have this problem. I have found out that the resistance in these pots
is provided by a piecce of plastic, and I wonder if the plastic degrades
with use. Any help would be welcome.
Thanks,
Tom Hruby

--
View this message in context:
http://www.nabble.com/Jumpy-Pots-tp25648568p25648568.html
Sent from the Electric Vehicle Discussion List mailing list archive at
Nabble.com.


_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev


_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
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  #3  
Old 09-28-2009, 10:55 AM
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Default Re: [EVDL] Jumpy Pots

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  #4  
Old 09-28-2009, 10:55 AM
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Default Re: [EVDL] Jumpy Pots

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  #5  
Old 09-28-2009, 11:05 AM
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Default Re: [EVDL] Jumpy Pots

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  #6  
Old 09-28-2009, 11:45 AM
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Default Re: [EVDL] Jumpy Pots

Out of curiosity, what is a PSA car?

Matt =


-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On Behalf
Of Evan Tuer
Sent: Tuesday, 29 September 2009 12:58 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Jumpy Pots

[quote] Bob Rice <xxx@xxx.xxx> wrote:
> Hi Tom and All;
>
> Here we go AGAIN! The #$@%^& pots are a crappy way to run =

> controllers/cars! And since the manufacturers can't seem to find =

> DECENT ones, or want to spend more than 29 cents for one, but they, =

> like the rest of us ,WEAR out!They keep on beating dead horses!

Who does? All the PSA cars use a conductive plastic pot on the throttle
pedal. They do not wear out.

Top tip: use a good quality conductive plastic pot designed for throttle
pedal position sensing. Spend at least $30, then forget about it, because
you'll never have to look at it again.

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  #7  
Old 09-28-2009, 11:55 AM
EVDL List EVDL List is offline
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Default Re: [EVDL] Jumpy Pots

Peugeot-Citroen (with double dot on the last e)
http://en.wikipedia.org/wiki/PSA_Group =



Cor van de Water
Director HW & Systems Architecture Group Proxim Wireless
Corporation http://www.proxim.com
Email: xxx@xxx.xxx Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: xxx@xxx.xxx
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130

-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On Behal=
f Of Matt Lacey
Sent: Monday, September 28, 2009 11:14 PM
To: 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] Jumpy Pots

Out of curiosity, what is a PSA car?

Matt =


-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On Behal=
f Of Evan Tuer
Sent: Tuesday, 29 September 2009 12:58 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Jumpy Pots

[quote] Bob Rice <xxx@xxx.xxx> wrote:
> Hi Tom and All;
>
> Here we go AGAIN! The #$@%^& pots are a crappy way to run =

> controllers/cars! And since the manufacturers can't seem to find =

> DECENT ones, or want to spend more than 29 cents for one, but they, =

> like the rest of us ,WEAR out!They keep on beating dead horses!

Who does? All the PSA cars use a conductive plastic pot on the throttle pe=
dal. They do not wear out.

Top tip: use a good quality conductive plastic pot designed for throttle pe=
dal position sensing. Spend at least $30, then forget about it, because yo=
u'll never have to look at it again.

_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines:
http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
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rg/help/index.html#conv
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  #8  
Old 09-28-2009, 12:05 PM
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Default Re: [EVDL] Jumpy Pots

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  #9  
Old 09-28-2009, 12:35 PM
EVDL List EVDL List is offline
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Default Re: [EVDL] Jumpy Pots

The conductive pots WILL last longer - auto OEMs use them for throttle
position sensors (TPS). They're spec'd at 1 million cycles (5 million
"dither" cycles) and run $30 to $50 or more.

Be sure to check the datasheets before ordering - MOST are guaranteed to
be linear between 10% and 90% of the listed range. So a 5K pot may not go
below 500 Ohms or above 4500 Ohms. The sample I tried goes down to 390
Ohms. This may (or may not) cause your controller to always be a little
bit ON. It may also trigger a "high pedal lockout" condition on your
controller. YMMV.

HEPI pedals are awesome! I'm currently using them with Zilla controllers.
I cut cone pedal off and am using it like a potbox with the original
throttle cable. The other is a complete pedal mounted on the floorboard.
Would be nice to disassemble the complete pedals and shove the guts in a
standard PB-6 box...

-Adrian


[quote] Evan Tuer wrote:

> All the PSA cars use a conductive plastic pot on the
> throttle pedal. They do not wear out.
>
> Top tip: use a good quality conductive plastic pot designed for
> throttle pedal position sensing. Spend at least $30, then forget
> about it, because you'll never have to look at it again.
>

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  #10  
Old 09-28-2009, 01:45 PM
EVDL List EVDL List is offline
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Default Re: [EVDL] Jumpy Pots

Why not put a HE into a Curtis box... HE Pots are cheap enough, its just a
matter of finding one that has the right physical turning range...

http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=1967060&k=Hall%20ef
fect

Bob Sisson
1993 Geo Metro Convertible Project
Gaithersburg MD


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