On-line computer control system
United States Patent McNamara, Bristol, all of England [73] Assignee: The Secretary of State for Defence in Her Britannic Majestys Government of the United Kingdom of Great Britain &amp; Northern Ireland, London. England [22] Filed: July 13, 1973 [21] Appl. No.: 378,821  
  Related U.S. Application Data [63] Continuation of Scr. No. 160.098, July 6. I97],  
 abandoned.  
 [30] Foreign Application Priority Data Jul) 9, 1970 United Kingdom 33326/70 [52] U.S. Cl. 235/153 AE, 235/l53 AK [5|] Int. Cl. G06f 15/16 [58] Field of Search 235/153 AE, l53 AK; 340/1461 BE, 172.5; 244/77 M, 76 R [56] References Cited UNITED STATES PATENTS 3,482,486 lZ/l960 Nordholm. .lr 244/76 R &#39;Eccles et al. Apr. 1, 1975 [54] LINE MP T CONTROL SY TEM 3,505,641 4/1970 Boskovich 244/77 M 1 1 Edward Swan Gloucester; 3,219.58 1351338 53252? 13 322337&#34;;  
  f Wadqiwl&#39;, 3.636.331 111972 Amrehn 235/153 AE B tol; c ob s, ristol; John 3,786,433 1/1974 Notley et al. 235/153 AE Primary E.\&#39;an1inerharles E. Atkinson Attorney, Agent, or Firm-Stevens, Davis, Miller &amp; Mosher [57] ABSTRACT The disclosure of this invention pertains to a control system for two gas turbine engines each having two identical sets of control transducers. Each engine is associated with a digital computer programmed for controlling the fuel flow of the engines. The computer is associated with means for being de-powered in the event of a fault in the computer or a fault completely preventing communication with the engine. Also each computer has means for sensing if the other computer is not on power and, if so, assuming control of the other engine through a switching system for connecting the one computer to either engine. The computer is also programmed, in the event of a fault in a transducer of the one set of transducers of whatever engine it is controlling to operate the switching system to gain access to the corresponding transducer of the other set.  
 7 Claims, 25 Drawing Figures PHENTEBAPR H975 &#39;2,8T5,39O  
 SIIEU CU 3F 2Q BASE LEVEL A37 PROGRAM I SECTION 10 OIVERALL SYSTEM PROGRAM \ICDU&#39; DOD ILLA 1L5A1L6A1L7A 11.1.5 11.58 1L6A1L7B M0 M1 M2 M3 140 M1. M5 M6 M7 1123A SENSOR 1183A READINGS 2123A 2183A -lCENTRAL PROCESSO FIGS.  
 ?,;**-TENTED APR H975 &#34;1.875.39U  
 SHEET 150F 24 155A 1 F] J! &#39;5 SEC.  
 &#34; FIG. 14.  
 PATENTED 11975 .875.390  
 SHEET 1781 24 START OUTPUT 152 H TO 150 READ 23 RX ./12  
 FIG. 15.  
 PMENTEDAPR H915 3,875,390  
 SHEET 18M 24 SET HIGHWAY I CONNECT COUNTER TO ZERO I r OUTPUT 182x INCREMENT i HIGHWAY l CONNECT I COUNTER OUTPUT 183Y YES ECHO CHECK SET MARKER M1 FIG. 17. i  
 ATENTEUAPR H975 &#39;1.875.39O  
 SHEET 188F24 NO FREEZE MOTOR 1122A YES  UNFR&#39;EEZE MOTOR 1122A r39 OUTPUT 1102A READ ALL /-3.L SENSORS 1123 A FREEZE MOTOR 2182A UNFREEZE MOTOR 2182A 3-g OUTPUT 2102A READ ALL SENSORS 2183A