Timed Ramp signal after a trigger in simulink

I want to generate a ramp function in order to drive a motor up to a certain speed when a condition is satisfied. Whenever I wanted to do something like this the ramp signal starts from the beginning of the simulation. I used enabled signal block but it did not help.

Also is there a way to make the ramp signel independent from the time step of the simulation. For example no matter what is the time step I want to generate a ramp signal goes from 0 to 3000 in 2 seconds.

Answer 1

[Marcelo]

You can try an Integrator with constant "1" input, wich gives a block whose output is "out = time".

Then, when your trigger signal becomes TRUE, you reset the Integrator and plug the "1" constant.

And, multiplying the output, you can change the ramp slope.

In this example, we have a ramp starting in t=3s and incresing 1500 per second.

[Tom Bernand]

Good solution, thx!

[Arda]

But how is the increasing stopped after two seconds?

Secondly, why do we set the constant of the Integrator to "1"? What does it provide to have output = time?