Fuel control for a multi-engine gas turbine installation

• US 4,303,976 A
• Filed: 09/11/1979
• Issued: 12/01/1981
• Est. Priority Date: 10/02/1978
• Status: Expired due to Term

• Current Assignee: Lucas Industries Limited (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: Lucas Industries Limited (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Joby, Michael J.
• Primary Examiner(s): Gruber, Felix D.
• Application Number:
  US06/074,533
• Time in Patent Office: 812 Days
• Field of Search: 364/431, 364/442, 60/224, 60/243, 60/39.28 R, 60/39.15
• US Class Current: 701/100
• CPC Class Codes: F02C 9/42 specially adapted for the control of two or more plants simultaneously
• CPC Class Codes: F05D 2200/11 Sum

Abstract

An electronic fuel control for a multi-engine gas turbine engine provides either independent or master-slave operation according to the position of a selector switch. In one position independent speed demand signals are separately compared with independent actual speed signals and the error signals produced are fed to proportional-plus-integral fuel controls. In the other position engine fuel control receives a signal corresponding to the error between 1/2 of the sum of the average speed demand and the actual speed of that engine whereas the other engines fuel control receives only an error signal representing the difference between the two engine speeds.

Claims

1. An electronic fuel control for a multi-engine gas turbine installation comprising at least two independent channels for controlling respective first and second engines, each channel including a speed demand signal generating means for providing a first signal representation of desired speed and first error signal generating means for generating a first error signal dependent on the error between the first signal and an actual speed signal corresponding to the actual speed of the engine controlled by said each channel;

common means connected to receive said first signal of each channel for providing an output of magnitude corresponding to the average of the first signals;

second error signal generating means for generating a second error signal dependent on the error between the output of said common means and said actual speed signal in respect of a specific one of the engines;

third error signal generating means provided for engine controlled by the other of said channels for generating a third error signal corresponding to the difference between the actual speed signals in respect of said first and second engines;

a fuel control means for each engine, each adapted to control fuel flow to the associated engine in accordance with an error signal fed thereto and error signal selector means having two conditions and adapted in one condition to feed the first error signal from the first error signal generating means to the respective fuel control means and in its other condition to feed the second error signal to the fuel control means associated with said one specific engine and said third error signal to the fuel control means associated with each other engine.