How to control a hydraulic system by PID

Hello, I am PhD student at the University of Zilina in Slovakia. I am currently working on a project to use PID control toolkit. We are running LabView 5.1 and PID Control Toolkit ver.2.1 under Windows NT4. We have bought a ATMIO16E10 card for the application that requires control of a servo-valve. Components of the hydraulic system are Regulation Axial Hydraulic Pump (generator), Nonregulation Axial Hydraulic Motor and Servo Valve which control movement of pump plate. I have a program which measure output voltage to servovalve, input revolve of hydromotor from tacho, pressure form transducers (pump), torque and revolve (pump) and movement of hydropump plate. My view of program is:
1.The card will acquire data from tacho, p
ressure transducers, torque and revolve transducer, movement of pump plate. The difference between measure and required value of hydromotor revolve will error.
2. Then the signal will go through a P, I, D process and the variables are changeable.
3. Then the process signal will output through the card and give voltage (current) to the servo valve to control of hydropump plate for the change of revolve of hydromotor.
At the same time there will be a graph on Monitor with measurement values and control voltage and the process goes until value is stabilized.
I have a very little idea of how to use PID control toolkit. I would be grateful if someone could give me some advice which type of P, I, D controller can I use and how it tuning. Might anyone have a idea of how I can use our measure program?
Thanks for any replies, peterk
Attachments:
mp.vi ‏137 KB

you migh consider the following text
Process Dynamics and Control by Seborg/Edgar/Mellichamp
It has good examples and discussion of tuning and the use of PID.
Good Luck
Preston Johnson
Business Development Manager
Industrial Applications
[email protected]
512-683-5444
Preston Johnson
Principal Sales Engineer
Condition Monitoring Systems
Vibration Analyst III - www.vibinst.org, www.mobiusinstitute.com
National Instruments
[email protected]
www.ni.com/mcm
www.ni.com/soundandvibration
www.ni.com/biganalogdata
512-683-5444

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On Jan 21, 1:10 pm, szuhsien <[email protected]> wrote:
> Thanks for ur attention.
> I just set up a oil hydraulic system and mechanism that is such a MTS(material test system).
> And my question is how to let my cylinder go forward at a constant velocity.
> Because when the cylinder contact my specimen(I have many different specimens), it will produce a reacting force and let the cylinder can't go forward at a constant velocity I set. 
> So I know it needs adjusting input voltage to servo valve .
> I have looked much information from Ni discussion forums, but I totally have no idea about this.
> I only know that I need to use PID control.  My feedback signal is from LVDT.
> What kind of ni card I need? I have pci-6033e, although its analogy outpout only can + - 10v.
> At least, 6033e can let me test servo valve between -5v to 5v.
> Can I use DAQ-card to achieve my goal? Because I'm not sure if 6033e supported pid toolkit.
>  
> By the way, this question is just the beginning.
> I need to finish displacement control, force control, and fatigue loading control at 10Hz.
>  
> ----------  
> servo valve: + - 10v input , 0v is at centered position. 10v is P port 100% to A Port.  threshold<0.1%
> platform: XP, Labview 8.2 (includes Real-time module, PID toolkit)
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How to Control Cheque value not exceed the PO Value

Dear All,
My client requirement of the how to control cheque make above the PO Value. My client make the PO before MIRO puchase dept. make the Advance payment request and send to Accounts Dept., Accounts dept. make the payment against the Down payment request. After that MIRO has been done full value open item show in vendor line itme. Account people clear the payment against the invoice. They run the APP & clear all payment. But after that Purchase dept. make the advance payment request against same PO and send to accounts dept., Accounts dept again make the payment against down payment request. This is request to how to control that.
Thanks in Advance
(CSB)

hi,
here in this case you should change the Business Process to have better control over the system.
Make the PO then make the Down Payment Request and make the payment.
check is there any user exit available while making the down payment request which should not be made more than the po value.

STO- How to control Over delivery with batch split?

Dear All,
In STO Scenario, how to control the over delivery?
I created a PO for the Intra Company stock transfer & Delivery created in the Background with the T Code VL10B. When I am doing picking using T code VL02N, the system is allowing to add more than PO Quantity in batches and system displaying the warning message (Specified quantity is greater than the open quantity/Message no. VL287) & allowing to save the deliver document..
Hence plz suggest how to restrict the same.
Hope it is clear.
Thanks & Regards
varun

I am also in the same boat.
I searched the forum and got the link STO - How to control Over delivery ?
I checked OSS notes 548914, 386340,215488 but to no avail.
I suggested user exit USEREXIT_SAVE_DOCUMENT_PREPARE in include MV50AFZ1 to my technical team for finding the resolution. So far it is still on hold.
If you come across any other solution, you can update the forum so that it would be helpful for many others.
Regards,

How to control po item from pr can't been changed manually?

when i create po via pr. the item can been modified.it is not permitted. how to control the behave in system.

hi
while creating a PO wrt PR if the user changes the item then we will get the warning Purchase requisition &, item &, has a different material number but we will not consider it.
if we do not want to continue
goto SPRO - MATERIAL MANAGEMENT - PURCHASING -ENVIRONMENT DATA -DEFINE ATTRIBUTES OF SYSTEM MESSAGES -SYSTEM MESSAGES -VERSION 00 APPLICATION AREA 06 NUMBER 56 MESSAGE TEXT Purchase requisition &, item &, has a different material number , u change the categeory from warning to ERROR
then automatically when ever ur doing po wrt pr when we change the item automatically the system issues an error message

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