Patent GB-860002-A (GB)
Title: Improvements in or relating to fuel supply control mechanisms
IPC: F02D9/00
Filed: 1957-05-28
Abstract: 860,002. Spray carburetters ; fuel injectors ; regulating. HALIK, E. E. May 28, 1957, No. 16970/57. Classes 7(3) and 7(6). A fuel metering mechanism comprises an axially slidable spring-loaded engine-driven shaft 21, Fig. 4, connected to a fuel metering valve 34 and driving through a worm gear 36, 38, a shaft 37 carrying discs 39 to which an adjustable braking force is applied by an adjustable magnet, adjustments of the braking force in accordance with throttle position causing variation of the thrust between the worm 36 and gear 38 which causes the shaft 21 to move axially until the thrust is balanced by spring 33, whereby the valve 34 is adjusted to control the fuel supply. In Figs. 3 and 4 the braking mechanism comprises discs 39 rotating between the poles 40 of an electromagnet whose strength is varied by a rheostat 49 adjusted by a thermally operated shaft 47b acting on the rheostat housing through meshing pinions 52, 53. The shaft 47b also carries a pinion 51 meshing with a rack 50 to adjust shaft 47 axially. The shaft 47 is also adjusted angularly, in accordance with throttle position, to vary a second part of the rheostat 49. Variations of engine speed produce a variation in the thrust in the worm gear 36, 38, which causes automatic axial adjustment of the metering rod 30 throughout a range determined by a pair of contoured stops 27, 28 on the rod 47 which co-operate with a roller 26 carried by rod 30 and are adjusted angularly by rotation of rod 47 in accordance with throttle valve opening. The fuel is supplied through a passage 35 to the metering needle 34, an idling by-pass being adjusted by a needle 55. In a modification the electromagnet 40 is replaced by a movable permanent magnet, or by a composite permanent and electromagnet, or by a generator arrangement having an adjustable rheostat in the field or armature circuits. In Fig. 2 the rod 21 controls the fuel supply indirectly by adjusting a rheostat 44 in the circuit of an electric fuel pump. In Fig. 6 the rod 21 actuates a rack 61 which rotates a pump piston 65, actuated hydraulically by a second pump 69, to vary the stroke of piston 65 which has an oblique end 65a controlling a discharge port 76. On the up stroke of piston 69 the piston 65 is raised until port 76 is uncovered, the fluid discharged from the upper side of piston 65 acting on a plunger 87 to open a fuel injection valve 85 supplied with fuel at 86. As engine speed increases the stroke of piston 65 is increased to increase the amount of opening of valve 84. In Fig. 11 the shaft 106, corresponding to shaft 21 in Fig. 4 and controlled by the braking effect of an electromagnet 104 whose field is adjusted by a rheostat 101 controlled from the accelerator pedal 100, controls a needle valve 107 controlling the supply of fuel to injectors 111, the opening of the injectors being controlled by a pump 112 similar to that of Fig. 6 which is controlled by an arm 113 attached to shaft 106. Alternatively the shaft 106 may adjust a rheostat controlling a fuel supply pump delivering the fuel to the injectors 111.