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Thread Subject:
hydraulic valve modelling

Subject: hydraulic valve modelling

From: Dennis Belleter

Date: 22 Mar, 2010 18:05:05

Message: 1 of 2

I'm trying to model a proportional hydraulic valve with a pressure reducing and a pressure relieving action in Simulink or Simscape. Since this is quite a difficult task I was wondering if there were some people with more experience in this area.

The valve has three ports and is a spool type valve: one port for in and out flow from and to a cilinder (port A), one for incoming flow from the pump (port P) and one outgoing flow port to the tank (port T).

The reducing action is done by the pressure from port A and a reference volume with a spring, this force is balanced by pressure from a pilot flow from the P port. The relieving action is done by a solenoid controling a poppet valve.

The main problem i have is designing an effective way to control the position of the spool valve and the poppet valve. However all suggestions or advices on modelling this type of valve are welcome not just those about the control of the valve.

Regards,
Dennis

Subject: hydraulic valve modelling

From: Arnaud Miege

Date: 21 Apr, 2010 15:04:21

Message: 2 of 2

"Dennis Belleter" <d.j.w.belleter@student.tue.nl> wrote in message <ho8bgh$hrl$1@fred.mathworks.com>...
> I'm trying to model a proportional hydraulic valve with a pressure reducing and a pressure relieving action in Simulink or Simscape. Since this is quite a difficult task I was wondering if there were some people with more experience in this area.
>
> The valve has three ports and is a spool type valve: one port for in and out flow from and to a cilinder (port A), one for incoming flow from the pump (port P) and one outgoing flow port to the tank (port T).
>
> The reducing action is done by the pressure from port A and a reference volume with a spring, this force is balanced by pressure from a pilot flow from the P port. The relieving action is done by a solenoid controling a poppet valve.
>
> The main problem i have is designing an effective way to control the position of the spool valve and the poppet valve. However all suggestions or advices on modelling this type of valve are welcome not just those about the control of the valve.
>
> Regards,
> Dennis

Have you looked at SimHydraulics? It has a number of valve models, such as:
http://www.mathworks.com/access/helpdesk/help/toolbox/physmod/hydro/ref/3waydirectionalvalve.html
http://www.mathworks.com/access/helpdesk/help/toolbox/physmod/hydro/ref/pressurereducingvalve.html
http://www.mathworks.com/access/helpdesk/help/toolbox/physmod/hydro/ref/pressurereliefvalve.html
etc...

It also has a number of demos of typical hydraulic systems. One in particular appears to be similar to your problem: Closed-Loop Electrohydraulic Actuator with Proportional Valve (sh_closed_loop_actuator.mdl).

Have a look at the white paper entitle "Parameterization of Directional and Proportional Valves in SimHydraulics" on the Simscape technical literature page:
http://www.mathworks.co.uk/products/simscape/technicalliterature.html

HTH,

Arnaud

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