[Diy_efi] Time delay relay?

[Mike]

At 04:49 PM 24/12/2002 -0800, you wrote:
>Mike, what kind of things should I ask of the ECU designers about the input
>circuit so that you have the info you need to tell me how to make it work?

Well:-

a.	First make sure the -ve of the cap goes to ground,
	+ve of cap goes to same ECU input as switch.
b.	Try a much larger cap, 22uF may be way too small if
	the pullup is something like 1K Ohm,
	You might need 470uF - 1000uF, if the pullup is 470-1K,
c.	Simultaneously with the above ask them what is the value
	of the internal "pullup".

When doing experiments like these use the 'decade' rule, if something
doesnt seem to make any difference at all when adding a component,
change its value by times 10 until a change is observed then you can
do a binary search in the other direction (unless of course you
have accurate data about the pullup or have already discerned the
formula from previous experiments)...


rgds

mike



rgds

mike





>----- Original Message -----
From: "Derek" <derek_obanion at yahoo.com>
>To: <diy_efi at diy-efi.org>
>Sent: Tuesday, December 24, 2002 2:31 PM
>Subject: Re: [Diy_efi] Time delay relay?
>
>
>> In any case, it didn't work. This is what I did:
>>
>> GND--------------SWITCH------------------INPUT
>>                         |                          |
>>                         ----(-10uf+)-----
>>
>> Made no difference. ECU still saw the switch as instant ON/OFF. I tried
a 3uf,
>> and a 22uf, no change.
>>
>> ----- Original Message -----
>> From: "Mike" <erazmus at iinet.net.au>
>> To: <diy_efi at diy-efi.org>
>> Sent: Tuesday, December 24, 2002 7:46 PM
>> Subject: Re: [Diy_efi] Time delay relay?
>>
>>
>> > At 12:35 AM 24/12/2002 -0800, you wrote:
>> > >Most of what you said is greek to me. Hehe. I still understand how to
wire
>it
>> > >and what to buy, but the theory is past me. Didn't take advanced
>electronics.
>> >
>> > No worries (as we say in Australia), life is an experiment and so
>> > is electronics and chemistry and ultimately its the same stuff ;-)
>> >
>> > >Do I have any danger of hurting anything just giving this a try?
>> >
>> > On the basis of what you've told me, I'd say no - but if a hawaian
>> > atoll gets vaporised in the next few days, I may backtrack on legal
>> > issues of liability,
>> >
>> > have a nice xmas, we had 34.8 deg C today, 36 due tomorrow <sigh>
>> >
>> > rgds
>> >
>> > mike
>> >
>> > _______________________________________________
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>>
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