초록 ▼

A method of, and a system for, detecting an occurrence of a surge in a gas turbine engine. The method includes steps, executed during consecutively occurring time periods, of: obtaining filtered derivatives of first and second engine operating characteristics; comparing the filtered derivatives of t

A method of, and a system for, detecting an occurrence of a surge in a gas turbine engine. The method includes steps, executed during consecutively occurring time periods, of: obtaining filtered derivatives of first and second engine operating characteristics; comparing the filtered derivatives of the first and the second engine operating characteristics to first and second threshold values, respectively; and incrementing a count only if both of the filtered derivatives exceed their respective threshold values. Otherwise, a next step decrements the count if one or both of the filtered derivatives do not exceed their respective threshold values. The method further includes a step of indicating a surge condition only if the count is equal to a predetermined value that is greater than unity. In a presently preferred embodiment of this invention the engine is a turbofan engine, the first engine operating characteristic is fan speed, and the second engine operating characteristic is exhaust gas temperature.

대표청구항 ▼

[ What is claimed is:] [1.] A method of detecting an occurrence of a surge in a gas turbine engine, comprising the steps of:during individual ones of a plurality of consecutively occurring time periods during an operation of a gas turbine engine,operating a first transducer to generate a first elect

[ What is claimed is:] [1.] A method of detecting an occurrence of a surge in a gas turbine engine, comprising the steps of:during individual ones of a plurality of consecutively occurring time periods during an operation of a gas turbine engine,operating a first transducer to generate a first electrical signal for representing a first engine operating characteristic; processing the first electrical signal to obtain a derivative of the first engine operating characteristic;operating a second transducer to generate a second electrical signal for representing a second engine operating characteristic;processing the second electrical signal to obtain a derivative of the second engine operating characteristic;comparing the derivative of the first engine operating characteristic to a first threshold value;comparing the derivative of the second engine operating characteristic to a second threshold value;incrementing a counter by a predetermined value only if the derivative of the first engine operating characteristic exceeds the first threshold value and if the derivative of the second engine operating characteristic exceeds the second threshold value; else, if at least one of the first and second threshold values is not exceeded,decrementing the counter by the predetermined value; andgenerating an output electrical signal for indicating an occurrence of a surge condition only if a value of the counter is equal to a predetermined value.