apply initial conditions to a subsystem

I want to apply an external initial condition to my resettable system, just like how it is possible with a integrator block. Anyone know how to do that?

[Fangjun Jiang]

What MATLAB release?

[ariel bintang]

2018b

Answer 1

[Fangjun Jiang]

Use "Initialize Function" in library Simulink\User-Defined Functions.

[ariel bintang]

But the state writer only works for discrete state space state owner. Is there any that works for continuous state space?

[Fangjun Jiang]

Integrator is supported. Not sure why continuous State-Space is not supported. If dropping a continuous State-Space block, the StateWriter block seems to "see" it. I didn't try to see if it actually works.

[ariel bintang]

would this be the correct way to implement it? The state space will reset when the resettable subsystem experiences a reset event (its "either" input becomes true)

[Fangjun Jiang]

No longer need to use "Resettable Subsyhstem"

1. Construct your regular Subsystem with states
2. Construct your reset logic to send a "reset" event, which trigs the "Reset Function"
3. Inside your "Reset Function", construct those reset values and write to the states.

Take a look at the built-in demo models.