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Unread 24-06-2002, 02:10
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#0047 (ChiefDelphi)
 
Join Date: May 2001
Location: Pontiac, MI
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1 if low pressure 0 if high pressure

Posted by Joe Johnson at 03/12/2001 9:35 PM EST


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.


In Reply to: Question on Digital Pressure Switch
Posted by Adrian Wong on 03/12/2001 9:06 PM EST:



The switch is just a simple on or off based on the
pressure screw setting (set to approx. 110psi as
shipped as I recall).

The switch does not turn off if very low, then on if in
a mid-range, then off again for higher.

As I recall, the switch provides the PBASIC with a 1
when below XXX psi and turns to a 0 when above that
psi. There is a slight hysterisis (spelling?) which
means that it turns off at say 110 psi but then does
not turn on again until it gets below 105 psi. In many
cases this is a very anoying feature, but in this case,
it is nice because the pump not sit and cycle off-on
at the make-break point.

In fact, I wish there was MORE hysterisis in the switch
and then all this talk about a delay in the PBASIC code
would be unnecessary.

Joe J.


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