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PC / Electronic Control of Hydraulics
QUESTION:Q1) How do you know when the proportional valve is properly set?
Q2) Do you wish to add proportional control to existing on-off solenoid
>valves?
Q3) Knowledge of the application would help
Q4) How many valves?
Q5) How fast to you require the response to be?
ANSWER: 1.I may be reading this question wrong, but most existing valves
(double acting) are sprung to the centre (no action) position. The
servo's that I describe have a centre position corresponding to a set
pulse width. Adjusting the connecting linkage to make the two correspond
gives a known centre position.
2.No.
3.Well, the application which sparked my interest was excavator control.
Two quality joysticks being the input devices as opposed to the direct
manual control on older machines such as the one we have. The cost of
the idea may simply prohibit any experimentation. BTW the safety aspect
has not escaped my consideration.
4.Four DA valves for the application above. Slew, boom, dipper and bucket.
5.Approximately 40mm/sec linear movement would seem to be adequate with a
valve travel of 10mm either way from centre. This would give a minimum
valve operation time of 250ms from zero to full flow either way.
You do realise I am publicly airing ideas which would normally be
confined to my head until I have decided just how ludicrous they are.
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