ESTABLISHING SYNTHESIS VALIDITY BETWEEN TWO SIGNAL SOURCES IN A TURBINE CONTROL SYSTEM

• Main Authors: WAYNE R SPOCK, LARRY B CARLISLE
• Format: Patent
• Language: English
• Published: 25.06.1986
• Edition: 4
• Subjects: AIR INTAKES FOR JET-PROPULSION PLANTS; BLASTING; COMBUSTION ENGINES; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS; ENGINE PLANTS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; GAS-TURBINE PLANTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES FOR LIQUIDS; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR; PHYSICS; PRODUCING MECHANICAL POWER; REGULATING; STEAM ENGINES; SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES; WEAPONS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS

In an electronic engine control (EEC) for a turbine engine, a high rotor speed signal (N2SYNTH) is synthesized from a sensed low rotor speed signal (N1) in a primary control channel (32) so long as the low rotor speed signal is healthy. If the low rotor speed signal (N1) is not healthy, the primary channel is reconfigured (FIG. 3) so that a low rotor speed signal (N1SYNTH) is synthesized from a sensed high rotor speed signal (N2). A secondary control channel 34 provides standby signals for use in the EEC and performs similar logic as in the primary channel, except that signal synthesis (N2 from N1 and vice-versa) is dependent upon N2 health. When the high rotor speed signal (N2) is healthy, a low rotor speed signal (N1SYNTH) is synthesized from a sensed high rotor speed signal (N2). When the high rotor speed signal (N2) is not healthy, a high rotor speed signal (N2SYNTH) is synthesized from a sensed low rotor speed signal (N1). For each of the low and high rotor speeds, redundant signals (N1A, N1B and N2A, N2B, respectively) are available. Primary sensors (10A, 24A) for low and high rotor speeds (N1A, N2A) serve the primary channel, secondary sensors (10B, 24B) for low and high rotor speeds (N2A, N2B) serve the secondary channel, and cross-channel communication is via a link (39).