Self-testable architecture for the overspeed protection and the emergency stop circuit

摘要

The unit (100) has a cut-out (14,2,16) for totally stopping the fuel flow to the engine to cut it (according to statutory regulations), or for reducing the speed of flow of fuel to the fuel injector in case of high turbine speed which may damage the turbine blades. A logic module (140) manages a state switch (121,143) in either the normal or in the test position. The fuel flow stopping capability of the cut-out is tested during each take off of the aircraft. In the case of testing the reducing of fuel flow speed by the cut-out, the proper functioning is verified by detection of a space between the control value (153) of the authorized flow of fuel and the real flow of fuel measured by sensors (22) of the instantaneous real-time value.