GB869906A - Improvements in and relating to control mechanisms for dual fuel internal combustion engines - Google Patents

Abstract

869,906. Engines using alternative fuels; regulating. ENGLISH ELECTRIC CO. Ltd. March 2, 1960 [March 10, 1959], No. 8213/59. Classes 7(2) and 7(6). In a mechanism for connecting a shaft A, Fig. 1, of a speed governor to the fuel metering linkage of a dual-fuel engine, the crank-arm B carries on its crank-pin a freely rotatable control member D having two bearings E1, Al spaced from the crank-pin C by the same distance as the throw of the crank arm B, bearing Al controlling the liquid fuel supply and bearing E1 controlling the gas and air metering valves, and the axis of the bearing not in use being brought into line with the axis of the shaft A. The gas metering valve driving shaft M is spring-loaded, as far as allowed by a variable stop Q, to the opened position of its valve and the air metering valve driving shaft S is spring- loaded to the closed position of its valve, both in the directions of the arrows, and the shaft Z controls the liquid fuel pump racks. For controlling the gas fuel without control of the liquid fuel the bearing Al is in line with the shaft A as shown in full lines and movement of the crank arm B rotates bearing El about the axis of bearing A1 to push, through a linkage K, K2, Kl a pin L2 of a freely pivoted lever L against a fixed dog L1 on the shaft M. Simultaneously, a lever P, freely rotatable on the shaft S and which carries an adjustable stop O, is rotated by engagement of a variable ratio radius arm N, in the slots of levers L, P, the stop O acting one one arm of a two-armed dog P1, fixed to the shaft S. The other arm of the dog PI co-operates with a pin R1 of a lever R freely rotatable on the shaft S, which is connected by linkage T, E to the bearing El. On the bearing A1 a telescopic member U is connected to the shaft Z through a lever V. Movement of the control member D into the position D1 shown in chain dotted lines causes the rod T through pin R1 and dog P1 to set the shaft S in an optimum position for liquid fuel operation air supply whilst rendering the control of shaft M inoperative and the control of shaft Z operative, due to the alignment of the shaft A with the bearing E1. An intermediate setting of the control member D allows operation on mixed fuels. A control device G, more fully shown in Fig. 2, changes fuel supply from gas to liquid fuel automatically and from liquid fuel to gas through manual operation of the lever H. With a failure of gas fuel supply the centre E1 moves upward to admit more gas fuel and the bar E abuts a stop F1 to raise a member F against a spring d. This disengages member F from a stop J and the spring-loaded plunger a moves the member F to the right to turn the control member D into the position D1. Manual release of the member F can be effected by depressing a lever g and resetting of the member F is effected by the lever H.