Opened 8 years ago
Last modified 4 years ago
#4168 new defect
DAE index reduction in clocked partitions — at Version 1
| Reported by: | Rüdiger Franke | Owned by: | Lennart Ochel |
|---|---|---|---|
| Priority: | high | Milestone: | |
| Component: | Backend | Version: | |
| Keywords: | Cc: |
Description (last modified by )
Clocked partitions may contain high index DAEs, for instance when basing a discrete-time controller on an inverse continuous-time model, see:
Modelica_Synchronous.Examples.Systems.ControlledMixingUnit
Modelica_Synchronous.Examples.Systems.EngineThrottleControl
OpenModelica produces wrong results for such models.
OpenModelica currently discretizes differential equations by replacing der(x) with (x - previous(x))/interval() during clock partitioning (Euler).
OpenModelica should reduce the DAE index inside a clocked partition prior to the discretization.
See the failing test synch.mos (ControlledMixingUnit)
https://github.com/OpenModelica/OpenModelica-testsuite/commit/ee09ab4b8551ce22514b4315cb04b88fdf2843ed
