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1.发明授权Fuel injection apparatus for internal combustion engines of the liquid-fuelinjection compression-ignition type 失效燃油喷射燃油喷射装置燃油喷射压缩点火类型的内燃机
公开(公告)号：US3627208A
公开(公告)日：1971-12-14
申请号：US3627208D
申请日：1969-10-06
CPC分类号： F02M45/08 , F02M45/12 , Y10T137/2562
摘要： A fuel injection system for an internal combustion engine of the liquid-fuel-injection compression-ignition type, having a fuel pump arranged to deliver fuel under supply pressure via a pressure-reducing valve to a pressure chamber of an injection plug, the said plug having an injection valve arranged to open in response to the pressure in the pressure chamber and controlling the injection of fuel from the chamber through the nozzle into the associated combustion chamber. The pressure-reducing valve is of the spring-loaded-piston variable-orifice type and when operative controls the fuel pressure in the pressure chamber, and hence the injection pressure, to a predetermined reduced value for the purpose of reducing engine noise during periods of idling. Means is provided however for rendering the pressurereducing valve inoperative when full injection pressure is required, either by bypassing the pressure-reducing valve altogether so that the fuel pump delivery passes directly to the pressure chamber throughout the whole of each pump delivery stroke, or by bypassing the restricted orifice of the pressurereducing valve during the final stage only of each delivery stroke of the fuel pump. In either case the bypassing means may be operated by a running control member of the engine, for example a fuel or speed control member.
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