Anyone able to design me a switching controller?

[Stupink]

I can build it ok, but I can't for the life of me work out what i need to build as I never did get into electronics that much.

My goal is "simple" but I realise it isn't quite that easy..

I want a pressure sensor/controller setup that will provide a 12v supply to a device under the condition it does not lower the inlet manifold pressure.

Supplying 12v will drop the pressure if supplied at the wrong time or for too long(so needs a fairly high switching frequency), but the pressure is also changing by nature, and dropping off at high revs etc, so the controller needs some kind of brain to figure out when the drop/change in pressure is related to it supplying 12v, and when it is just occuring anyway, it will need to allow the boost to build/drop freely as before. I'm aware the pressure will need to drop slightly in order for the device to detect it is doing so, that is fine so long as its minimal effect. The goal is to supply 12v as much as possible without dropping the boost.

[Chavtastic]

Dom on MIGweb has just opened an electronics workshop. This sounds right up his street. Drop him a PM!

[Stupink]

Good call, i'll drop him a pm cheers!!!

[Stupink]

No pm's or emails allowed to that user. I'll try to sign up to his website and try there, however i fear i may be too lazy.. lets see how i get on.

[Chavtastic]

I've linked him to this thread mate [img]/wink.gif[/img]

<a href="http://www.migweb.co.uk/forums/vauxhall/off-topic-discussions/292367-doms-new-online-electronics-shop-what-would-you-like-see-stocked-3.html" target="_blank">http://www.migweb.co.uk/forums/vauxhall/of...-stocked-3.html</a>

He'd be good enough for the job. He made a USB controlled washing machine IIRC [img]/laugh.gif[/img]

[Stupink]

Cool cheers, Another user has been helping too on the vauxsport, so hopefully one of them will be able to design something [img]/smile.gif[/img]

[Chavtastic]

*chokes*

You've been to the dark side!? [img]/laugh.gif[/img]

[Stupink]

Yeh, I never used mig really as it was too busy, so makes no odds to me about the politics, much quieter easier to follow and the same advantages [img]/smile.gif[/img]

The daft side lives within us all!

[dom]

Afraid I wont be able to help on this one [img]/sad.gif[/img] I'm up to my teeth in it just trying to get the workshop back up and running (i.e. built) so its going to be a while before I can start designing new stuff [img]/sad.gif[/img]

Worth signing up to my forum anyway - you'll be kept updated of any developments and I'm opening a new online store towards the middle of next week [img]/smile.gif[/img]

[Stupink]

<!--QuoteBegin-dom+--><div class='quotetop'>(dom)</div><div class='quotemain'><!--QuoteEBegin-->Afraid I wont be able to help on this one [img]/sad.gif[/img] I'm up to my teeth in it just trying to get the workshop back up and running<!--QuoteEnd--></div><!--QuoteEEnd-->
No sweat, thanks for looking [img]/smile.gif[/img]

[dom]

No probs

Sometime in the future if you havent got it sorted maybe but for the moment I cant help [img]/sad.gif[/img]

Feel free to sign up on my forum - <a href="http://www.picbits.co.uk/forums" target="_blank">www.picbits.co.uk/forums</a> and you will be kept updated of anything that is happening [img]/smile.gif[/img]

[Stupink]

I hate electronics, I build the odd thing, but I don't get involved in the design as I don't know what i'm doing enough.

There won't be any ecu fooling needed, it will continue to operate as normal. The device will cause a minor boost drop, but the ECU won't treat this any different to a poorly turbo etc, like asking 2bar of it, but only able to give you 1.5, the ecu will just say to shut the wastegate, and what boost you get you get, it will continue to use the map sensor etc to set the fuel accordingly and run ok.

In context of my plan the device is not a boost controller, so your references about looking at it 40% open v's 60% closed are not relevant. It is simply the best way of describing its design requirements, its actual perpose goes a little deeper than that, but I don't want to go into that at this stage as A. it will make me look an idiot, and B. if it does work i'll be wanting to do a bit more R'n'D before releasing the plans/selling them or whatever.

If you think you may be able to help I believe you have enough detail on the requirements, if not I will try to clear up any last bits, I'm happy to build it myself from a clear (dummies guide)diagram and parts list etc, or i'd happily cover costs etc if you'd consider/want to do it. At the moment its purely a personal project, I expect during the build/testing I'll find out its pointless and doesnt work [img]/biggrin.gif[/img] if not then i'm happy to continue the project with whoever helps me build the prototype.

[paulmac]

G'day all.

Perhaps this could do the job you are asking?
<a href="http://www.jaycar.com.au/productView.asp?ID=KC5377&CATID=&keywords=kc5377&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=" target="_blank">http://www.jaycar.com.au/productView.asp?I...eMax=&SUBCATID=</a>

Or this one...
<a href="http://www.jaycar.com.au/productView.asp?ID=KC5378&CATID=&keywords=kc5378&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID" target="_blank">http://www.jaycar.com.au/productView.asp?I...ceMax=&SUBCATID</a>=

Both of these projects come from the book Performance electronics for cars,
<a href="http://www.jaycar.com.au/productView.asp?ID=BS5080&CATID=&keywords=bs5080&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID" target="_blank">http://www.jaycar.com.au/productView.asp?I...ceMax=&SUBCATID</a>=

You don't need the book to build the kits, but the book has heaps of other car electronics stuff in it also.

Jaycar ships to the UK, and has an 0800 number for you to call too. (I don't work there, I just shop there!)

Hope that helps you.

Paul

[Stupink]

Cheers for the link, looks like a good site to bookmark!
I've had so many problems with the car that i've not really looked into this anymore.
once the car is working ok i've thought of a way to test the theory manually, so will see if it works before going in too deep.