ODE output restriction option

I am trying to put a restriction on s1dot of the output of a fucntion in ODE45. Any help how to model the restriction?

I want the function to stop for example on s1dot = 1 and use s1dot=1 for the rest of the time interval after that

[Torsten]

Use the "Event" option of the ODE solvers:

https://de.mathworks.com/help/matlab/math/ode-event-location.html