Quote:
Originally Posted by Tytus Gerrish
if they use a doubble-acting valve for the cylender and 2 single-acting valves to stop the exhaust they would fail open and allow the whole system to purge
|
That's very close to the test we ran prior to ordering the 3-way solenoid.
This document shows a way to control position that appears to comply with <R73> and <R74> after adjusting the single-acting solenoid to fail open (not closed like they specify):
http://www.chiefdelphi.com/media/papers/1476
It would be nice to use a 3-way, center closed solenoid, but my team hasn't seen a way to do it that is less complex than the above design and complies with both <R73> and <R74>.