METHOD OF DIAGNOSING TWO-CHANNEL AUTOMATIC CONTROL SYSTEM OF GAS-TURBINE ENGINE Russian patent published in 2007 - IPC F02C9/28 

FIELD: aircraft industry.

SUBSTANCE: proposed method comes to control of gas-turbine engine by main electronic channel, control of actuating elements of main electronic channel providing control of gas-turbine engine, switching off of main electronic channel in case of its failure or failure of actuating elements with subsequent changing over to standby hydromechanical channel by means of channel selector at measuring, in main control channel, of at least speed of rotation n_npc of high-pressure compressor, and fuel delivery G_f to combustion chamber. According to invention, when engine is controlled by main electronic channel preset speed of rotation is additionally set, and measured speed of rotation n_npc is compared with preset value and at first logic signal I₁ is formed and presence of ENGINE STOP signal is determined and if signal I₁ and ENGINE STOP signal are present, second logic signal I₂ is formed, and at presence of signal I₂, test action is set which provides short-time successive sensing of signal to switch on selector from main to stand by channel and sensing of signal I₄ to actuating element of main channel to increase flow rate of fuel G_f, and preset value of fuel flow into combustion chamber is provided and measured value G_f is compared with preset value in process of sending of signal I₄ and at fifth logic signal I₅ is formed, and at simultaneous presence of signals I₄, I₅, sixth logic signal I₆ if formed indicating that channel selector of automatic control system is faulty. Signal to change over selector from main to stand by channel is sent for period of 1 s, and signal I₄ is sent 0.5 sec later than selector change-over signal for time equal to 0.5 s.

EFFECT: improved reliability of operation of two-channel automatic control system owing to functional control of channel selector in process of engine switching off at end of flight.

2 cl, 1 dwg