Turbo pressure and IQ

[Errecinque]

The transition from open loop to closed loop is handled by the ecu and, I believe, is always present.
The open loop is used to manage a sort of effect of an overboost, the map that refers to this management is the map that to output the percentage of the valve and the input has the IQ and Rpm. One of the pressiione has the same input but of course that is output from the pressure-aim to maintain

First question : according to what decides the ecu to take account of the objective map turbo and when the vgt ?
Second : knowing most the family edc16 fiat group, I have never read of this, closed and open loop. There is also on these ecu's or is the prerogative of other families type vag? Sorry but this is a topic that I do not know and I would like to study

[sportraxxx]

I confirm,to me, are interested in..

[franco75]

there are hysteresis curves according to rpm to select the mode of management. Are maps, threshold of IQ, if they exceed or fall the value of the curve is the switch mode open or closed loop.
In practice, if a certain number of laps is injected with an IQ higher than a curve is used, the open loop effect and an overboost),
when the flow rate drops below another curve is used to capture a closed loop, meaning the ECU "chases" the set point of the map turbo.

[made83]

Yes, hello, I also noticed I this phenomenon to the diagnosis, in particular, it seems that up to a certain ****s pressure, the ecu follows the preset values in the map vgt, in particular with the engine that does not require much torque.. practical Example at 1800 rpm with the original map in the crowds the opening vgt is as set by the map, in fact, exceeds 100 mbar, about the pressure value of the turbo-set in the homonymous map in fez see it as "pressure lens"

[made83]

there are hysteresis curves according to rpm to select the mode of management. Are maps, threshold of IQ, if they exceed or fall the value of the curve is the switch mode open or closed loop.
In practice, if a certain number of laps is injected with an IQ higher than a curve is used, the open loop effect and an overboost),
when the flow rate drops below another curve is used to capture a closed loop, meaning the ECU "chases" the set point of the map turbo.

Franco, you present these curves of hysteresis to which you refer or is it your deduction??

[franco75]

no, this is not my deduction, mail a sample file and we can see them

[made83]

Might not be map pressure threshold in which if the value differs by a certain time from the one place in the map dedicated to the turbo pressure by pass the map vgt to control it through a sort of feedback mechanism, electronic as from feedback from the MAP so that it holds the value the more close as possible to the set?

[made83]

However I in my jtdm 16v that has the edc 16 c39 (euro 4 with swirl) an overboost I have ever read in the various log

[franco75]

perhaps I have explained badly, sorry.
Are two neighboring curves, in function of the rpm is set to an IQ, if you exceed the IQ of the first curve switches to openloop, if it falls below the IQ of the second curve goes to the closedloop.
*made83, what do you mean, you don't see an overboost diagnosis?

[made83]

That the pressure does not differ never more than that pre-set in the pressure table in relation to rpm and iq, part I repeat in the operations with very little torque, but I think what you might mean an overboost as sonnpressioni under half a bar. However, I do not I'm telling you that nonnhai reason only that I do not understand in that way, since there is already the map pressure in relation to iq and rpm there may be another map (the one to which you refer you), which is used to bypass the common taking into account the same values crossed, I don't know if I can explain myself