초록 ▼

An apparatus and method is provided to start gas turbine engines at cold start. A gearbox is not mechanically coupled to any accessory or to the starter-generator. Rather, a controller is used to route power to a starter-generator to rotate the turbine mainshaft to start the gas turbine engine. The

An apparatus and method is provided to start gas turbine engines at cold start. A gearbox is not mechanically coupled to any accessory or to the starter-generator. Rather, a controller is used to route power to a starter-generator to rotate the turbine mainshaft to start the gas turbine engine. The controller prevents power to an accessory drive motor, until the starter-generator creates a positive torque. When a positive torque is reached, excess power is routed to the accessory drive motor, typically a brushless direct current motor.

대표청구항 ▼

We claim: 1. A turbine engine control system, comprising: a starter/pump controller configured to send power to a starter-generator, said starter/pump controller configured to prevent power from being directed to an accessory drive motor if said starter-generator is operating with negative torque;

We claim: 1. A turbine engine control system, comprising: a starter/pump controller configured to send power to a starter-generator, said starter/pump controller configured to prevent power from being directed to an accessory drive motor if said starter-generator is operating with negative torque; and a bulk oil temperature sensor configured to initiate a start sequence for said starter/pump controller if the bulk oil temperature is less than a pre-determined threshold value. 2. A turbine engine control system of claim 1, wherein said starter-generator is operably connected in parallel with said accessory drive motor. 3. A turbine engine control system of claim 1, wherein said accessory drive motor is a brushless direct current motor. 4. A turbine engine control system of claim 1, wherein said bulk oil temperature sensor is configured to route power to an accessory drive motor and to said starter-generator regardless of said staffer-generator torque. 5. A turbine engine control system of claim 1, wherein said accessory drive motor is a lubricant pump drive motor. 6. A turbine engine control system of claim 1, wherein said starter/pump controller is further configured to prevent lubricant from being displaced from a lubricant pump while said staffer-generator is operating with a negative torque. 7. A turbine engine control system of claim 1, wherein said starter/pump controller is further configured to enable lubricant to be displaced while said starter-generator is operating with a net positive torque. 8. A turbine engine control system of claim 1, further comprising a sensor operably connected to route power to the accessory drive motor if said starter-generator is operating with non-negative net torque. 9. A turbine engine control system of claim 1, further comprising a sensor operably connected to route power to the accessory drive motor if said starter-generator is operating with net positive torque. 10. A turbine engine control system of claim 1, further comprising a sensor operably connected to route power to a turbine engine if said starter-generator is operating at a net negative torque. 11. A turbine engine control system of claim 1, further comprising computer readable media operably connected to at least one sensor-controller or said starter/pump controller. 12. A gas turbine engine cold start system, comprising: a bulk oil temperature sensor configured to trigger a starter/pump controller to initiate a cold start procedure if the bulk oil temperature is less than a pre-determined threshold temperature; and a starter/pump controller configured to govern power to a starter-generator and configured to govern power directed to an accessory drive motor if said starter-generator is operating with negative torque. 13. The gas turbine cold start system of claim 12, wherein said accessory drive motor is a fuel pump motor. 14. The gas turbine cold start system of claim 12, wherein said accessory drive motor is a lubricant power drive motor. 15. The gas turbine cold start system of claim 13, wherein an electric current through the fuel pump motor is determined by the fuel pump motor speed. 16. The gas turbine cold start system of claim 12, wherein an electric current through said starter-generator is determined by the torque demanded by the starter-generator. 17. The gas turbine cold start system of claim 14, wherein an electric current flowing through the lubricant power drive motor is determined by the pressure demand of the lubricant power drive motor.