ENGINE CONTROL SYSTEMS STUDY AS APPLIED TO INTER-ENGINE THRUST CONTROL,

VTOL type aircraft incorporating turbo-fan engines as lifting means do not sensibly lend themselves to the cross-coupling provisions inherently available with the shafting of propeller type engines. An engine failure in the fan engine case is therefore a considerably more precarious matter for which provision for thrust compensation more responsive than a pilot would appear to be required. The study utilizes a very comprehensive hybrid simulation of the WTF-60 engine wherein all engine components are simulated on a performance map basis thereby including all non-linearities as well as permitting the availability of any and all engine parameters for use as controlled variables operating in conjunction with the manipulated variable, fuel flow. Further, realistic acceleration control in the course of large upsets is accomplished thereby permitting a control system analysis which is completely applicable to the detail design of the control system and the selection of components. Author