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effecting), the cost of the EEC (a significant percentage of the cost of the control system) can be minimized using common circuitry. Utilizing common concepts for categories of functions also helps to reduce software costs and improve integrity through the internal reuse of common modules that interface with the hardware. For example, three common concepts for minor loop effectors are: 1. Single string in which the EEC controls a single-channel effector with a single-channel feedback. 2. Redundant active-standby in which a function has redundant effectors with one in control at a time, the EEC switching control to the other in the event of a failure. 3. Redundant active-active in which a function has redundant effectors with both in control simultaneously, each getting effectively half of the authority signal from their respective EEC channel. The three concepts are shown schematically in Figure 2-3. For effectors, there are actually two levels of decomposition required to completely map function to form to the extent that the functional characteristics are completely defined. The schematics shown in Figure 2-3 show the first level of decomposition, defining the basic organization of subfunctions within an effector architecture. Architectural configuration at this level of decomposition will usually be driven by mission capability, safety, and failure effect requirements. For non-safety-critical effectors that have a minimal impact on mission capability (i.e. the ability to satisfy the intended mission or usage), a single-string effector architecture might be chosen to minimize cost and weight. For effectors with more stringent safety requirements, a redundant effector architecture might be needed. The primary differentiator between the active-standby and active-active concepts is the amount of perturbation or off- schedule operation that occurs during a failure situation. In the event of a subcomponent failure (either in the command or feedback side of the loop), the active-standby concept will typically subject the engine to a larger amplitude transient due to the amount of time required for the EEC to detect the failure and transfer control to the redundant channel. The active-active concept will 45PDF Image | Improving Gas Turbine Engine Control System
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