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From: Bob on 23 Jun 2010 16:52
Hello,
I am trying to model this part of my system: http://img.photobucket.com/albums/v451/Bob2Chiv/temp/modelprob.jpg
in SimHydraulics. It looks to me like 1. a pilot-controlled pressure relief valve and a 2. 2-way, 2-position valve actuated by a solenoid and returned by a spring.
Concerning 1.
How do I make simhydraulic's pressure relief valve, pilot-controlled?
Is there a different simhydraulic component I should use instead?
Concerning 2.
I can easily make the valve itself, but how do I make it actuated by solenoid/spring?

Any help on either of these questions would be appreciated.
From: Arnaud Miege on 13 Jul 2010 11:30
"Bob " <bob2chiv(a)yahoo.com> wrote in message <hvts64$p3a$1(a)fred.mathworks.com>...
> Hello,
> I am trying to model this part of my system: http://img.photobucket.com/albums/v451/Bob2Chiv/temp/modelprob.jpg
> in SimHydraulics. It looks to me like 1. a pilot-controlled pressure relief valve and a 2. 2-way, 2-position valve actuated by a solenoid and returned by a spring.
> Concerning 1.
> How do I make simhydraulic's pressure relief valve, pilot-controlled?
> Is there a different simhydraulic component I should use instead?
> Concerning 2.
> I can easily make the valve itself, but how do I make it actuated by solenoid/spring?
>
> Any help on either of these questions would be appreciated.

The pressure-relief valve in SimHydraulics is a data-sheet based model suitabkle for system simulation, where the valve is only a small part of the system, and therefore foes not take into account any pilot control. If you want to cinclude that level of detail, you will have to create your own model, either using the Simscape language (which requires you to have a good grasp on the underlying equations) or using the Simscape/SimHydraulics blocks, such as the 2-way directional, the check valve and a couple of orifices.

The 2-way directional valve takes the instantaneous valve opening as a physical input (port S). If you want to represent the electro-magnetic-mechanical actuation side, you can, but again, you'd have to do that in Simscape, and then feed the relevant position physical signal to port S of the valve. For example, have a look at the demo ssc_solenoid_magnetic (new in R2010a).

HTH,

Arnaud
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