[Diy_efi] Jetronic - RFI

[Don Sauman]

Its a thought.

mark krawczuk wrote:

> hi, would a greencap or ceramic  help in filtering? i know it did help 
> in my brothers crank trigger that was picking ip alot of noise ?
> mark k
>
>
> ----- Original Message ----- From: "Don Sauman" <donsauman at cythera.net>
> To: <diy_efi at diy-efi.org>
> Sent: Thursday, 2 March 2006 7:29 PM
> Subject: Re: [Diy_efi] Jetronic - RFI
>
>
>> To be honest I am not sure where it is located, but I will find it. 
>> You could be right about the fields although these are trains are low 
>> speed domestic. Mu metal will work but so will soft iron e.g. soft 
>> iron film cans so mag stripe is not degraded and vid tapes.
>>
>> I will try the rfi shielding first and see how that goes. As for the 
>> dealers here, I suspect almost all of you guys knows more about this 
>> than any of them. Apart from that, they really don't want to know 
>> about an '87 model Volvo, but they are lovely cars. Could use a heart 
>> transplant though. Let's see a Chev 350 bored and stroked to 400ci  :-)
>>
>> Cheers
>> Don
>>
>> urq wrote:
>>
>>>> On this same topic, I have 1987 Volvo 760 GLE that has a related 
>>>> problem. While waiting at a railway crossing, an electric train 
>>>> passes, and the brake pedal will vibrate and then relax with ABS 
>>>> warning light coming on. The immediate fix is to, at an appropriate 
>>>> place, switch off the ignition and restart.
>>>>
>>>> I think you have given me a clue as to a solution. Put the ABS 
>>>> controller in a grounded box, and use some ferrite beads on the leads.
>>>>
>>>> Comment?
>>>
>>>
>>>
>>> ... it is difficult to tell for sure, but since the ABS system is so 
>>> prone to electrical noise from the other systems in the car 
>>> (primarily ignition & charging), the manufacturers usually do a 
>>> passable job of basic shielding from electrical interference... in 
>>> my ABS-equipped Audis the ABS brain is under the back seat.  What 
>>> may in fact be happening in your case is the noise is magnetically 
>>> coupled ... I'd expect you'd get some pretty big and fast moving H 
>>> fields in a high speed electric train. If that's the case you may 
>>> have a difficult time creating an effective shield.  The systems my 
>>> company builds use strong electromagnets to move stages around, and 
>>> they can cause the display on a standard CRT to get distorted.  We 
>>> had to use something called a mu-metal shield around the CRT to 
>>> minimize the effect.
>>>
>>> I suspect you aren't the only one in your area to have experienced 
>>> this ... perhaps you can pose your experience to a local Volvo 
>>> dealer to see if it is something they've heard reported before ...
>>>
>>> Steve B
>>> San Jose, CA (USA)
>>>
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>>>
>>
>> -- 
>> Don Sauman
>> 35 Asteroid Way
>> Carlisle 6101
>> Western Australia
>>
>> P: 08 9361 0337
>> F: 08 9361 0581
>> M: 0427 389 547 CDMA
>> M: 0413 746 695 GSM
>>
>>
>>
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>
>
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-- 
Don Sauman
35 Asteroid Way
Carlisle 6101
Western Australia

P: 08 9361 0337
F: 08 9361 0581
M: 0427 389 547 CDMA
M: 0413 746 695 GSM