This information is part of the Modelica Standard Library maintained by the Modelica Association.

This block detects positive and negative peaks of differentiable and non-differentiable input signals without sampling.

For differentiable input signals, an extremum is detected if the derivative of the input signal is zero.

To handle non-differentiable input signals, the input signal u is conditioned by a first order with time constant T. Like in the derivative block, the derivative of the input signal is approximated by (u - x)/T. This way even steps with local extrema just before and after the step are taken into account.

Additionally, when the simulation terminates, y_min and y_max are updated.