GB448295A - Improvements in means for controlling internal-combustion engines of the liquid-fuel injection type - Google Patents

Abstract

448,295. Fluid-pressure servomotorcontrol systems. DODSON, E., 66, Lewin Road, Streatham, London. April 23, 1935, No. 12173. [Class 135] [See also Group XXVII] In engines of the liquid-fuel injection type, means for controlling the amount of fuel injected by the pump are actuated by a device sensitive to induction-pipe pressure, and independently by means connected to the throttle control lever, further means being provided for operating the fuel control independently of both the throttle control and the pressure sensitive device. In Fig. 1, the fuel-control lever 6 is actuated by a servomotor piston 5, the valve 4 of which is controlled by a capsule 3 subjected to the delivery pressure of the air supercharger communicated by a pipe 1. The capsule 3 is further under the control of an altitude capsule 12, the position of which may be adjusted from the throttle control lever 31 by means of a link 9, cam 10, and lever 11. The throttle lever 31 is connected, in the manner described in Specification 419,472, to a mixture-control lever 8, so that when the former is in its idling position I or full-open position III, the latter is moved from its weak-mixture position A to its rich position B, and the lever 8 is connected to the link 9 by an arm 8x. The lever 8 adjusts the fuel to give the weak or rich mixture by a cam 7, lever 6<xx>, and sleeve valve 6<x> around the valve 4. For taking-off of aircraft, the lever 8 is moved to position C, in which linkage 17, 17<x> actuates a cam 18 and lever 17<xx> so as to adjust the boost control 19<x>, as described in Specification 419,113, to allow extra supercharging pressure, while still permitting the boost control to act through links 20, 21, 22 on the air throttle 23 in the induction pipe. In this position C of the lever 8, the cam 10 also comes into action to give an extra-rich mixture ; the lever 8 is also moved into this position when the throttle lever 31 is moved past a sealing-device into an emergency position IV. Further, in the position C, an anti-detonating agent, such as alcohol with or without water, is added to the mixture by the opening of a valve 26 admitting the second fuel from a supply tank through a pipe 28 connected to the eye of the supercharging-blower. The throttle lever 31 also actuates a cam 29 to vary the datum of the boost control in the manner described in the above-mentioned Specification 419,113 to prevent the usual supercharging pressure from being obtained with a weak mixture. The throttle and mixture control levers are further connected to an arm 40 controlling the ignition advance of the magneto 41<xx>. Also, when the throttle lever 31 is in position I or III, it raises the fuel-control lever 6 by means of cams 51, 52. The capsules 3 and 12 are each located in a container which limits the expansion in case of puncture, and comprises two cup-shaped parts 55, 56, Fig. 6, having interfitting tongues 58 and gaps 57, expansion of the container being resisted by a spring 61 bearing on flanges 59 formed at the ends of the tongues 58.