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Old 01-01-2008, 09:11 AM   #6
Aquamist
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Join Date: Mar 2006
Location: Sussex, England
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2004 Citroen Picasso
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Quote:
Originally Posted by Zak Shaker View Post
thanks a lot for your imput Richard.

... So you mean the pump keep same RPM and then a valve regulates the flow inside? sounds just great to me.
...
Not quite, the system is more advanced than that.

The motion (control flow) of the pistion inside the pump is controlled by PWM (Pulse width modulation) and PPM (pulse position modulation) algorithm. The piston stroke is updated every 1/50th of a second by the controller in relation to FIDC. The system works almost like an engine.

The solenoid valve merely acts as an on/off gate - nothing complicated. We have persuded Perrin to employ a solenoid valve rather than a checkvale to avoid any dribble or high vacuum applications.
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Last edited by Aquamist; 01-01-2008 at 09:39 AM.
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