Mayf;
Yes, that's the point-- no need to open a wastegate either to to a pre-set
opening by a controller or use it as a pressure blow-off valve at a fixed
boost pressure. By using the "DC" output of a pressure transducer, the boost
can be monitored and the wastegate opened to limit the boost if desired
(like an electronically-controlled pop-off valve) but if the "AC" output is
filtered properly (gotta get a TI DSP chip in here somewhere :^) ), a
controller could blow off just enough boost so that the flow drops to a
surge level well below the point of damage. This way only enough boost is
passed out through the wastegate to avoid damage. Compressor surge is
powerful enough to break things, so I'm sure it would be detectable.
Regards, Neil Tucson, AZ
-----Original Message-----
From: DrMayf [mailto:drmayf@teknett.com]
Sent: Friday, June 27, 2003 10:07 AM
To: Albaugh, Neil; land-speed@autox.team.net
Subject: Re: Compressor Surge Definition
I do not know. Howevver, there are any number of digital controllers. And
this is what a waste gate does but is just preset to some specific value.
Now let's see, you are measuring the ac component of th epressure in the
ductwork. When it starts to flow backwards or the pressue increases
dramatically then you open the waste gate? Ok, so this only makes tis
electrical because you have to put in a set point for the pressure
transducer to trigger? NO, No, I see, when you start getting some ac then
you activate the waste gate untill no more ac.. Might work! Not being
electronic by nature, would take somebody smarter than me to develop. And
the first thing would be to take a measurement during a surging condition to
see if it is even measureable.
mayf
----- Original Message -----
From: "Albaugh, Neil" <albaugh_neil@ti.com>
To: "'DrMayf'" <drmayf@teknett.com>; <land-speed@autox.team.net>
Sent: Friday, June 27, 2003 9:05 AM
Subject: RE: Compressor Surge Definition
> Mayf;
>
> I was just thinking...it would be a simple matter to connect a
> pressure transducer to the compressor outlet and look at the AC-only
> output. Surge could be detected this way and a wastegate could be
> automatically cracked open only far enough to stop the surge. This
> way, boost could be kept as high as possible. Has anyone ever tried
> this idea?
>
> Regards, Neil Tucson, AZ
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