Method for real time computation of the state variables of a hybrid differential-algebraic process model

Method for real time computation of the state variables of a hybrid differential-algebraic process model in succeeding time steps on a process computer, comprising the steps of:

• with a process interface, using the process computer for at least one of detecting at least one process variable of a physical process and producing an output for influencing the physical process,
• solving the hybrid differential-algebraic process model using an integrator functionality, a condition evaluation functionality and a consistency detection functionality for structure decision variables, and depending on whether a condition change is detected, variables parts of the hybrid differential-algebraic process model being active or inactive,
• wherein the consistency detection functionality is carried out using a sorted consistency handling function, a first part of the sorted consistency handling function comprising all condition-independent portions of the hybrid differential-algebraic process model, a second part of the sorted consistency handling function comprising all condition-dependent portions of the hybrid differential-algebraic process model which influence structure decision variables, and a third part of the sorted consistency handling function comprising all condition-dependent portions of the hybrid differential-algebraic process model which do not influence the structure decision variables,
• wherein, in the case of a condition change of at least one structure decision variable, for detection of a consistent set of structure decision variables, the first and third parts of the sorted consistency handling function are carried out only once and only the second part of the consistency handling function is carried out repeatedly, and
• wherein the sorted consistency handling function is carried out with each execution of the integrator functionality.