Redundant engine starting system

Details Redundant engine starting system Redundant engine starting system

1994-06-15

1995-07-25

Casaregola, Lois J.

Power plants

Combustion products used as motive fluid

Different fluids

60625, 74 6, 74661, F02C 7275

Patent

active

054351251

ABSTRACT:
A redundant engine starting system is disclosed that includes at least first and second sub-starters that rotate corresponding sub-starter output shafts affixed by a joining gear to rotate an engine starter shaft to start the engine. Each sub-starter includes a speed sensor for detecting rotational speed of the sub-starter, and a control valve to control rotational speed of the sub-starter. A system control intelligence interprets sensed rotational speeds of the sub-starters and commands the control valves, so that the control valve of an operative sub-starter is commanded to allow increased rotational speed of the sub-starter and therefore its corresponding output shaft whenever the system control intelligence interprets the sensed rotational speed of an inoperative sub-starter. In a preferred embodiment, the system is employed to start a gas turbine engine; the sub-starters are powered by compressed air supplied by sub-starter air ducts; the control valves are operatively disposed within the ducts; and the system control intelligence is an electronic engine control system affixed to the engine.

REFERENCES:
patent: 3951008 (1976-04-01), Schneider et al.
patent: 4484871 (1984-11-01), Adman et al.
patent: 4662233 (1987-05-01), Mazzorana
patent: 4899534 (1990-02-01), Sorenson

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