| 摘要 |
<p>A fuel management system (34) for a turbine engine (10) having a metering valve (50) controlled by the input of an electronic computer (36) to a resolver (48). A head sensor (64) responds to pressure differential across the metering valve (50), to control a bypass valve (80) which allows a portion of the fuel available from a supply conduit (58) to return to a reservoir (28). An overspeed governor (116) receives an input turbine (10) to position a cam (120) having four contours (154, 156, 158 and 160) thereon. The first contour (154) provides a feedback to balance the actual speed input. The second contour (156) controls the opening of a proportional valve (122) when the rotation of the turbine exceeds a preset value to allow an operational fluid pressure in the bypass valve (80) to be reduced and additional fuel to flow to the return conduit (95). The third contour (158) controls the movement of flapper valve (128) which allows an integrator piston (124) to move and open an integrator valve (126) to permit a further reduction in the operational fluid pressure such that an additional and corresponding amount of fuel is returned to the reservoir (28). The fourth contour (160) has a linkage (182) connected to the integrator piston (124) and in conjunction with the movement of the flapper valve (128) by the third contour at speeds up to about one half of the normal operational speeds allows the integrator piston (124) to move without opening the integrator valve (126) to provide assurance that the overspeed governor (116) is capable of functioning.</p> |
