Estimating Initial Conditions for Blocks with External Initial Conditions
When an integrator block uses an initial-condition port, which you specify by an
IC block, you cannot estimate the initial conditions of the
integrator using Simulink®
Design Optimization™ software. Estimation is not possible because external initial conditions
have priority over the initial conditions of a specific block to maintain the integrity
of the model.
To tune the initial conditions of an integrator block with external initial conditions, you must modify the model to make the external signal into a tunable parameter. For example, you can set the IC block that feeds into the integrator to be a tunable variable and estimate it.