Simulink integrator for piecewise-constant / variable time step input

Hi,
I am trying to write an efficient integrator (S-function preferred) for piecewise-constant / variable time step input.
Output y should update when
  • input x changes
  • integration reaches ydelta since last output change (timestep = ydelta/x).
Taking the input as continuous requires derivative data and ultimatively gives timestep control to the solver.
Using variable sample time for the output (Level 1 C-code) and NextTimeHit could be useful, but would need to be triggered on a change of the input signal.
Ideas?

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See my submission to File Exchange for an implementation in Stateflow.
Still looking for an S-function implementation.

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提问:

2017-9-20

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2017-9-21

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