[Wbo2] Using the Bosch WB sensor with L1H1 circuit board

Sat Nov 19 13:18:22 UTC 2005

Commercial temperature range is 0c to 70c. Which is
easily exceeded in the interior of an automobile.
Check the tolerances for even passive compoments such
as capacitors and resistors at the edge of their
commercial grade ranges.

Please recall that it was TE that made the claim to
fame as to how good their equipment allegedly is.

Maybe ask them about the display fiasco and the use of
commercial grade parts. . . 

Al.

--- James Holland <J_Holland at btopenworld.com> wrote:

> I understand that there is some history here and I
> don't want to get into that but I do think your
> comments are a little harsh in some areas, though I
> would be interested in what tests were performed to
> verify accuracy. I am curious as to the effects of
> variations in exhaust temperature and the effect of
> backpressure too. The Bosch datasheet shows that
> these do have an influence but never having made any
> backpressure measurements (or EGT) I can't really
> equate those values to real world cases. 
> I design electronics for military applications so I
> do appreciate designing to meet temperature ranges
> and designing to meet environmental requirements.
> Environmental testing is a good thing in terms of
> design proving but very expensive and needs a
> clearly defined set of requirements. What level of
> testing do you think should be carried out? Proper
> selection of components will allow you to meet the
> required temperature spec BUT what spec do you
> really need? If the unit is going to be inside the
> vehicle then a commercial temperature range is
> probably more than adequate, how many of us are
> going to be out tuning our vehicles when its -40C??
> None of the Mitsubishi ECUs that I have seen have
> been conformally coated, they are clearly designed
> to be used inside the vehicle where its dry and
> indeed they are mounted up under the dashboard.
> Vibration testing is really rather irrelevant, if
> you sell something as a kit you can't control the
> build quality.
> High specs and thorough testing costs money, there
> has to be a balance between cost and performance.
> What I want is the cheapest possible piece of kit
> that will do what I want it to do.
> This wasn't intended to be a long winded rant but I
> think there are some good points here that everyone
> should consider when they are building their WB kit,
> wherever they get their design from.
> 
> Cheers
> James
> 
> ----- Original Message ----- 
>   From: allen brown 
>   To: wbo2 at diy-efi.org 
>   Sent: Friday, November 11, 2005 3:15 PM
>   Subject: Re: [Wbo2] Using the Bosch WB sensor with
> L1H1 circuit board
> 
> 
>   >We believe our DIY unit, when built, tested and 
>   >calibrated as we describe, are as good as the
> Motec and Autronic units 
>   >you'll pay up to AU$2,000 for. 
> 
>   That is quite a claim. What have you done to
> verify the accuracy of your unit? Have you built a
> gas bench to verify response time and accurate
> reporting of the AFR? What certified test equipment
> do you have? What test procedures have you used to
> verify the claims you are making? 
> 
>   Have you had your WB unit independently verified
> by certified engineers?
> 
>   What type of environmental testing has been done
> on your units? Are all of the components used in
> your product been qualified for automotive use? Are
> the circuit boards conformal coated? What is the
> temperature range of the components used?
> 
>   Or is it just another 'hobby' product you as so
> famous for?
> 
>   Thanks for your time,
> 
>   Al.
> 
> 
>   Peter Gargano <peter at techedge.com.au> wrote: 
>     Wayne Macdonald wrote:
>     > Hi.
>     > I have one of the first DIY-WB circuit boards
> that was designed for the 
>     > L1H1 wide band sensor.
>     > Can I adapt this circuit board to use the
> cheaper Bosch wide band 
>     > sensors like the one found on the VW?
> 
>     Wayne,
> 
>     As much as I hate plugging our own product, as
> you are a fellow Aussi, 
>     I'll simply mention we do a DIY controller for
> the LSU sensor (in fact 
>     two DIY controllers, one with an inbuilt
> display). Our design is 
>     fairly mature and we have sold thousands as DIY
> kits. We also sell 
>     them pre-built. We also offer a fix-it service
> if you have trouble 
>     getting your unit to go (they are out of
> necessity complex pieces of 
>     equipment if they are to perform well).
> 
>     As other will mention, there are a few people
> now who make low cost 
>     controllers for wideband sensors. Many are junk,
> and a few are 
>     reasonably good. We believe our DIY unit, when
> built, tested and 
>     calibrated as we describe, are as good as the
> Motec and Autronic units 
>     you'll pay up to AU$2,000 for. I'd say our unit
> is better, but that 
>     would be a bit OTT.
> 
> 
>     Peter Gargano
>     --
>     Tech Edge Pty. Ltd. http://techedge.com.au
> http://WBo2.com
>     ph : (02) 6251 5519 Int'l : +612 6251 5519 Fax :
> +612 6251 0558
>     Street addr : 37 Jalanga Cres., Aranda, ACT
> 2614, Australia
>     Postal addr : PO Box 288, Jamison Centre, ACT
> 2614
> 
> 
> 
> 
> 
> 
>     te.
> 
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> 
> 
> 
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