GB639923A - Improvements in or relating to liquid fuel supply systems for internal combustion engines - Google Patents

Abstract

639,923. Regulating; fuel injectors. CHANDLER-EVANS CORPORATION. March 18, 1946, No. 8303. Convention date, March 26, 1945. [Classes 7 (iii) and 7 (vi)] [Also in Group XXVIII] A system for supplying fuel or antidetonant liquid to the cylinders of a multi-cylinder engine comprises a rotary distributing piston which is moved axially by liquid pressure to maintain the flow of liquid to the cylinders proportional to the air flow. In Fig. 1 fuel from a pump 32 is delivered to injectors located in the cylinders or adjacent the intake valves through pipes 59 controlled by a notch 56 in a rotary distributor piston 46 moved axially by the pressure differential across a metering orifice 80 to vary the area of the outlet orifices 58 uncovered by the slot 56. A pipe 60, similar to the pipes 59 leading to the injectors, supplies fuel to the metering orifice 80 and chamber 44, from which it flows through a pipe 90 to a valve 94 comprising a stem 28, actuated by a bellows 22 subjected to the air pressure differential at a Venturi 10 in the intake pipe 12, and a sliding sleeve 92 actuated by a bellows 84 subjected to the tuel pressure differential across the orifice 80, and then to a drain pipe 96. The valve 94 controls the pressure in chamber 44, and hence the position of piston 46, to maintain the flow through orifice 80, which is a measure of the flow through each pipe 59, proportional to the air flow. A restriction 88 delays the response of bellows 84 to pressure changes in the chamber 44 so that e.g. increased air flow produces a temporarily disproportionate increased fuel flow. In Fig. 2 the normal fuel supplied by a pump through a pipe 136 flows through a control valve 160, metering-jet system 144, and a pressure regulating valve 148 to a spraying tube 106 in the air intake 102, and anti-knock or other fuel from a tank 216 is supplied by a distributor 214 to pipes 220 leading to injectors in the engine cylinders or adjacent the intake valves. A valve 134 controlled by the air pressure differential at a Venturi 100 acting in chambers 112, 118 and the fuel pressure differential across the metering jet system 144 acting in chambers 170 and 166, maintains the pressure in chambers 154, and hence the unmetered fuel pressure in chamber 156 connected thereto through an orifice 158, at a value such that the flow through the jet system 144 is proportional to the air flow. A capsule 128 controlling a leak valve 122 corrects the air pressure differential for varying air density. The fuel flows to the jet system 144 through a plate valve 178 which in its lean position permits fuel flow through a pipe 180 and jets 184, 188 and in its rich position brings an additional jet 192 into action. At slow-running the fuel flow is controlled by a valve 146 connected to the throttle valve 104. The distributor 214 comprises a piston rotated from the pump rotor 217, and free to be moved axially by the pressure of the fluid entering at 218 to control the flow through the pipes 220. The fuel may be injected through spring pressed valves balanced for the pressure in the cylinder, or the injectors 332, Fig. 5, may be positioned inside the exhaust valves 320, the distributor connecting the supply pipes 340 to the flow of fuel before the ports 342 leading to the injector 332 are opened to reduce the effect of the pressure wave in pipe 340. The Specification as open to inspection under Sect. 91 describes a modification, Fig. 6 (Cancelled), in which the fuel injectors are fed through pipes 59 by pump plungers 400 actuated by a rotating cam 404, the effective pump strokes being varied by a sliding piston 412 controlled by the entering fuel pressure in chamber 416 and the pressure in chamber 422 regulated by the valve mechanism 94 of Fig. 1, so that the fuel flow is proportioned to the air flow. This subject-matter does not appear in the Specification as accepted.