Up and running

pavlo
Zen Performance
Posts: 407
Joined: Mon Aug 04, 2008 10:18 am

Up and running

Post by pavlo »

Have got our first solaris car up and running properly. Now with closed loop fuel control, and also I have the close loop knock control working nicely!
Jez
Horsham Developments
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Re: Up and running

Post by Jez »

Nice one :)
What engine are you using?
Ryan.g
Syvecs Staff - Caretaker
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Re: Up and running

Post by Ryan.g »

Hey Paul

Good to see you aboard chap and nice work with the S6

Are you using the closed loop fuelling on load?

Also what Gain control are you running with the knock control, as at present im picking up alot of noise with the 3sgte off boost.

Ryan
Charlie
Syvecs Staff- Tea Boy
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Re: Up and running

Post by Charlie »

Good Work Paul :)
pavlo
Zen Performance
Posts: 407
Joined: Mon Aug 04, 2008 10:18 am

Re: Up and running

Post by pavlo »

I am using closed loop fuelling on boost, but had to spend a lot of time altering the PI control to get smooth accurate transitions and corrections. The knock control also requires setup time.
dynamix
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Location: Cambridgeshire

Re: Up and running

Post by dynamix »

Good work Paul - this sounds awesome from our chat on wednesday.
Jolly Green Monster
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Re: Up and running

Post by Jolly Green Monster »

is there limits to the amount of fuel correction it will do and flag a faulty sensor if it breaches them?

Not that the wideband sensors when mounted in the exhaust seem to fail often but just a thought :)

Simon
pat
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Re: Up and running

Post by pat »

Simon,

there is a limit to the amount of fuel correction that can be applied, with separate negative and positive limits. They are definable, so feel free to put in whatever values you consider sensible / are happy with :)

Lambda sensor fault detection is done on the lambda signal itself not on its derived parameters. There is a minimum variation which must be exceeded in less than the minimum variation time, if it isn't then the sensor is flagged as failed. This doesn't cater for the scenario where the sensor starts reading wrong, but the problem you have with that is trying to reliably determine whether the ongoing correction is due to the sensor or there is a problem with (say) the fuel pressure (if you don't have a fuel pressure sensor).

It is perhaps something that requires a little more thought, but perhaps you can see the dilemma ? Trying to reliably decide WHAT is wrong is difficult when you can't even predict what sensors a car will or will not have; there's no point in putting in a hook that says that if the lambda is reading lean but the relative fuel pressure is fine then it's most likely the lambda sensor, because a) you don't know that the car has a fuel pressure sensor and b) the lambda sensor may STILL be right (what if the cam timing jumped? the VE would change, so the appearance AFR would reflect this, ergo you could end up flagging a perfectly good sensor, than in this instance may save the engine, as being faulty, which could be disastrous)...

Hope this makes sense,

Pat.
Jolly Green Monster
Posts: 25
Joined: Mon Jul 28, 2008 9:06 pm

Re: Up and running

Post by Jolly Green Monster »

Pat,

Thats great, thanks.

High and low limits etc is good.. in some ways I like the idea of closed loop fulling on boost and in otherways I don't :)
I presume the high and low limits are not configurable dependent on load/boost?

cruise you are unlikely to damage anything..

Simon
pat
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Re: Up and running

Post by pat »

Simon,

there are two sets of limits on the final correction, based on TPS. There is a normal limit, and a full throttle limit, which limit is applied depends on whether TPS exceeds a definable threshold or not. I suppose it might be possible to add a MAP dimension to the minimum / maximum final correction limits, but not sure whether that makes sense or not, due to reasons listed above....

Cheers,

Pat.
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