SYSTEM FOR AUTOMATIC CONTROL OF REVOLUTION NUMBER OF STAGE OF GAS TURBINE ENGINE Russian patent published in 2002 - IPC

FIELD: automatic control of revolution number of stage of gas turbine engine. SUBSTANCE: system includes electronic control subsystem and electronic hydromechanic actuating subsystem. The last includes driving and feed-dispensing circuits of fuel meter. Feed-dispensing circuit is provided with throttle meter on metering opening of which constant pressure drop is controlled in closed loop by means of slide pressure-drop valve and controlled by said valve piston drive of sloped washer of feeding axial-piston pump. According to analysis upon which all variants of invention are based spontaneous increase of fuel consumption is caused by two main reasons: a) circuit - pressure drop valve _→ piston drive as dynamic link is statically and dynamically unstable because of negative gradient of change of summed forces loading piston of piston pump, namely: force created by pump and force created by return spring, stability of loop with such circuit is provided due to negative hydraulic feedback in it; b) tendency for interruption of hydraulic feedback of loop caused by rigid fixation of slide valve of pressure drop valve unit due to jamming non-filtered foreign particles containing in fuel in variable throttling openings of its very miniaturized command unit. Novelty is dimensional and(or) constructional change of command unit of pressure drop valve and(or) using in piston drive spring unit (instead of return spring) providing more intensive (partial or complete) compensation of negative gradient of change of pump force. EFFECT: improved design allowing to eliminate abnormal modes at operation of system. 8 cl, 10 dwg, 2 tbl