Patent GB-1489764-A (GB)
Title: Fluid metering valve for direct fuel injection systems
IPC: F02M63/02
Filed: 1974-09-30
Abstract: 1489764 Valves EATON CORP 30 Sept 1974 [3 Oct 1973] 42456/74 Heading F2V [Also in Division F1] A valve 30 or 31 for a direct fuel injection system comprises a valve member 100 or 130 movable between static positions in a cylindrical bore 94 or 116 to communicate bore inlet and outlet passages 96 and 98 or 150 and 120 and meter a quantity of fuel. A groove 107 or passages 146, 151 in the valve member provides momentary communication between bore inlet and outlet passages as it moves between the static positions. An electromagnet 104 or 129 may be energized to move the valve member from one static position to the other. In a second embodiment, Figs. 4 and 5 (not shown), the valve member (260) is angularly rotated in 180 degree steps by an electromagnet (292) in the bore (258) to provide momentary communication between the inlet and outlet passages (264 and 268, 270). The valve member (260) may be rotatable at a variable speed by the engine or an electric motor. In a third embodiment, Figs. 6 and 7 (not shown), the valve member (360) is moved axially in the bore 354 from one end position to the other by the alternate energization of electromagnets (362 and 364) at opposite ends of the bore to provide momentary communication between the inlet and outlet passages (356 and 358). The fuel flow through the valve during the momentary communication between the inlet and outlet passages may be variable. In Fig. 2 the axial position of the sleeve 122 surrounding the upper part of the valve member 130 is adjustable by a cam 44 and follower 91 to vary the axial length of the annular chamber 144 providing communication between the valve member passages 151 and the outlet passage 120. In the second embodiment the valve member (260) is axially adjustable by a cam (290) and follower (286) to vary the axial overlap of the valve member passage (284) and the outlet passages (268, 270). In the third embodiment a pair of sleeves (366, 368) are adjustable by an angularly adjustable plate (384) having an elliptical groove (368) engaged by pegs (388, 390) on the sleeves to vary the width of a flow passage (380) between valve member passages (379) and the outlet passage (358). The fuel flow through the valve of the third embodiment may be varied by controlling the magnitude of the signals to the electromagnets or by angularly adjusting a ported sleeve surrounding the valve member. The valve members 100 and 130 may control pilot and main injections through an injector into a compression ignition engine combustion chamber. In the illustrated fuel injection system a cam-shaft driven distributor 26 receiving fuel from a pump 22 via an accumulator 24 supplies the inlet pipe 79 of a valve assembly 28 for each engine cylinder and the electromagnets 104 and 129 are energized with a timing controlled by an electronic circuit responsive to a signal generator 16 driven with the distributor 26 and the position of a throttle pedal 12 which also positions the cam 44. In a second embodiment of the fuel injection system, Fig. 3 (not shown), one valve assembly (281) supplies fuel from the accumulator (241) to the distributor (261) which supplies each cylinder injector (32a<SP>1</SP> ... 32d<SP>1</SP>). The valves of the second and third embodiments may be used as pilot or main metering valves and two may be combined in a common housing to provide pilot and main metering functions.