General Electric Company

Robert C Wibbelsman

Robert Lawrence Mayer

The invention concerns a starting system for a gas turbine aircraft engine which automatically controls the sequencing of events needed during engine startup. The control schedules fuel in a manner which avoids stalls, and, further, takes corrective actions when stalls occur, both on the ground and in the air. The control detects failures in the starter energy source, which can cause an abortive start and damaging temperatures. The control also provides unique scheduling of fuel in severely cold conditions.

Control for a gas turbine engine

The opening of variable bleed doors is scheduled as a function of both booster and compressor speed so as to better maintain the desired booster stall margin and increase efficiency during certain periods of engine operation. The schedule based on core speed is modified in response to changes in fan speed to increase or decrease the amount of bleed, thereby increasing stall margin or improving the steady-state performance, respectively.

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Sardinia, OH, United States of America

Robert C Wibbelsman