초록 ▼

A gas turbine engine control system sends a demand signal to a fuel throttle valve. The demand signal is modified by a measured fuel flow signal during normal operation. Operating parameters such as pump speed and recirculation valve portion are sensed. Combining these sensed parameters with the kno

A gas turbine engine control system sends a demand signal to a fuel throttle valve. The demand signal is modified by a measured fuel flow signal during normal operation. Operating parameters such as pump speed and recirculation valve portion are sensed. Combining these sensed parameters with the known geometry of the system, a calculated pressure differential between a point upstream of the throttle valve and a point in the combustor is determined. This calculated pressure differential is applied to the known geometry of the system from before the throttle valve to the combustor, including sensed opening of the throttle valve. A calculated flow is thus obtained and compared to the measured flow. An excessive difference between the measured and calculated flows indicates flow meter error. In such a case the calculated flow is substituted for the measured flow in modifying the demand signal.

대표청구항 ▼

A method of operating a gas turbine engine comprising: sending a control signal to a fuel flow throttle valve; modulating said throttle valve in response to said control signal; measuring fuel flow passing through said throttle valve and establishing a measured flow signal; using said measured flow

A method of operating a gas turbine engine comprising: sending a control signal to a fuel flow throttle valve; modulating said throttle valve in response to said control signal; measuring fuel flow passing through said throttle valve and establishing a measured flow signal; using said measured flow signal to modify said control signal; detecting the physical operating parameters of the pump and valves in the fuel flow system; calculating a calculated flow based on said operating parameters and establishing a calculated flow signal; comparing said measured flow signal and said calculated flow signal; and substituting said calculated flow signal for said measured flow signal to modify said control signal when said measured flow signal and said calculated flow signal differ by more than a preselected amount.