Simulink Logic - Capturing a Signal Value at a Specific Point for Control

Hi,

I am creating a controls model in Simulink and need to capture a simulink signal at a specific point in the simulation, and then keep the value to use as an input to the controller for the next cycle. I can capture the signal value from the point of interest (velocity = 0) to the end of the simulation, but I would like to lock that value at the trigger point and then reset at the next. I have added a screen grab to show the blocks I am using, and the output.

The value I need to capture is the position when the velocity reaches 0, so when the position changes direction.

Its a basic logic question, but any help would be great,

Cheers

Patrick

Answer 1

[PB75]

Hi Fangjun,

As in the following? Using a DataStoreMemory block in the triggered subsystem?

[Fangjun Jiang]

Put the DataStoreMemory block outside. Inside, import the position signal, feed it to a DataStoreWrite block.

[PB75]

Thanks Fangjun.

I have removed the DataStoreWrite block as the triggered subsystem captures the signal at that point.

Answer 2

[Fangjun Jiang]

The logic of velocity >=0 will generate a step output signal. Use this signal to trig a triggered subsystem. Specify the trigger as rising edge. Inside, use Memory Write block to store the value.