Hi,

I'm in the startup phase of a model of a an automatic gearbox with MathWorks Simscape.

Basically all I have for now is a Gasoline engine with an input throttle signal connected to a torque converter. My question is how to implement a simple lookupswitch that can lock the torque converter so it doesnt effect the system anymore. The lookupswitch should be activated when the engines rpmvalue exceeds 800rpm. 

Here is the logic I want to implement in Simscape.

E (the engine)
C (converter)
S (Switch)
O(Output)

Here how it should be in default mode:

E->S->C->O

And If Engine RPM-value > 800
then
E->S->O

A switch that can jump between two different modes based on the input.

Maybe a simple case-switch block can be implemented , but I dont know really how to to in Simscape when u have physical connections.  Does anybody know a simple way to do it?

Regards
/Staffan

"Staffan " <flojten@gmail.com> wrote in message <i8chnk$jf8$1@fred.mathworks.com>...
> Hi,
> 
> I'm in the startup phase of a model of a an automatic gearbox with MathWorks Simscape.
> 
> Basically all I have for now is a Gasoline engine with an input throttle signal connected to a torque converter. My question is how to implement a simple lookupswitch that can lock the torque converter so it doesnt effect the system anymore. The lookupswitch should be activated when the engines rpmvalue exceeds 800rpm. 
> 
> Here is the logic I want to implement in Simscape.
> 
> E (the engine)
> C (converter)
> S (Switch)
> O(Output)
> 
> Here how it should be in default mode:
> 
> E->S->C->O
> 
> And If Engine RPM-value > 800
> then
> E->S->O
> 
> A switch that can jump between two different modes based on the input.
> 
> Maybe a simple case-switch block can be implemented , but I dont know really how to to in Simscape when u have physical connections.  Does anybody know a simple way to do it?
> 
> Regards
> /Staffan

Your best bet is to use SimDriveline for this rather than Simscape. It has a torque converter and a clutch block designed for exactly that purpose. Have a look at the demo drive_full_car.mdl that ships with SimDriveline, it does exactly that, i.e. a torque converter with lock-up. 

HTH,

Arnaud