System Modes of operation

Heat source Fuels used Heat transfer 1 Heat-saving appliances Charging system Mode of operation Draught Shape Purpose Charge handling... 

On the basis of a single fault hypothesis, fault isolation is performed by comparing the periodically updated coherence vector with the rows of the FSM. However, for a hybrid system model, the entries of a FSM are mode dependent. For a model with Ks switches, < 2 physical feasible switch state combinations, i.e. n/ system modes are to be considered. The FSM holding for all modes provides a specific FSM for each mode. To make sure that the coherence vector is compared with the component fault signatures in the right FSM, the current system mode of operation must be identified from measured system or process outputs. Figure4.7 depicts a flowchart of a bond graph model-based FDI process. 

In conclusion, there is a unique set of ARRs for each system mode. A system mode is characterised by a set of discrete switch states that are variables in the ARRs. When switches change their state, the system mode of operation changes. As a result, residuals of the current set of ARRs may take significantly different values invalidating the set of ARRs that characterises the current system mode. Sets of ARRs can be used to identify system modes and changes of system modes. 

Introduction Principle of operation Types of sensor The gas supply system Mode of operation... 

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