Simulink Control Design™ - MathWorks

In an open-loop configuration, you can connect this input port to a source that drives your

plant to the desired operating point for estimation. For instance, you can use a Constant

block set to an appropriate value.

Data Types: single | double

y — Plant output

scalar

Connect this port to the plant output.

Data Types: single | double

start/stop — Start and stop the estimation experiment

scalar

To start and stop the estimation process, provide a signal at the start/stop port. When

the value of the signal changes from:

• Negative or zero to positive, the experiment starts


• Positive to negative or zero, the experiment stops

Typically, you can use a signal that changes from 0 to 1 to start the experiment, and from

1 to 0 to stop it. When the experiment is not running, the block adds no perturbation at

the u + Δu or Δu port. In this state, the block has no impact on plant behavior.

Start the experiment when the plant is at the desired equilibrium operating point. In a

closed-loop configuration, use the controller to drive the plant to the operating point. In

an open-loop configuration, you can use a source block connected to u to drive the plant

to the operating point.

Let the experiment run long enough for the algorithm to collect sufficient data for a good

estimate at all frequencies it probes. The block displays a recommended experiment

length in the Experiment Length section of the block parameters. This value is based on

the experiment mode and the frequencies you specify for the experiment.

• When Experiment mode is Sinestream, the recommended experiment length is:

∑

i

2 π

ωi

Nset,i+Nestim,i +2TsNfreq,

where:

16 Blocks — Alphabetical List