Cross-Limiting Control
The cross-limiting control system is a sophisticated system that addresses some of the shortcomings of the parallel system. Essentially, it is a parallel system that provides fuel and air flow rate measurements and separate pow- erful controllers for fuel and air. Theses controllers enforce a signal interlock that prevents unsafe operation on load changes. On load increase, the air control signal always leads the fuel signal, and on load decrease it lags the fuel signal, as illustrated in figure 3.1. The interlock provides a certain de- gree of safety, but also means that at load changes the excess air is forced to a higher level than the optimum. Because the system measures fuel and air flow rates, it is capable of correcting for some variations, for example com- bustion air temperature changes that can affect the excess air ratio (Elliot, 1997; Natural Resources Canada, 2000).
Cross-Limiting ControlThe cross-limiting control system is a sophisticated system that addresses some of the shortcomings of the parallel system. Essentially, it is a parallel system that provides fuel and air flow rate measurements and separate pow- erful controllers for fuel and air. Theses controllers enforce a signal interlock that prevents unsafe operation on load changes. On load increase, the air control signal always leads the fuel signal, and on load decrease it lags the fuel signal, as illustrated in figure 3.1. The interlock provides a certain de- gree of safety, but also means that at load changes the excess air is forced to a higher level than the optimum. Because the system measures fuel and air flow rates, it is capable of correcting for some variations, for example com- bustion air temperature changes that can affect the excess air ratio (Elliot, 1997; Natural Resources Canada, 2000).
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