公开(公告)号：US5377636A

公开(公告)日：1995-01-03

申请号：US102830

申请日：1993-08-06

申请人： David M. Rix ,  Harry L. Wilson ,  Rodney C. Wilson ,  George L. Muntean

发明人： David M. Rix ,  Harry L. Wilson ,  Rodney C. Wilson ,  George L. Muntean

IPC分类号： F02M57/02 ,  F02M59/30 ,  F02M37/04 ,  F02M7/00

CPC分类号： F02M59/30 ,  F02M57/024

摘要： A pump-line-nozzle fuel injection system in which a supply pump is coupled to a high pressure pump having a plurality of pumping cylinders, each of which has a cam-driven timing plunger and a floating metering plunger. During the retraction stroke, flow to a timing chamber formed between the pistons is blocked by a solenoid valve while the fuel passes into a metering chamber, at the discharge side of the pump, which is closed relative to the high pressure delivery line by a delivery valve. Once the proper quantity of fuel has been metered, the solenoid valve opens allowing fuel to flow into the metering chamber, balancing the pressure on opposite sides of the metering piston, so as to prevent the metering plunger from retracting further as the timing plunger continues to retract. During the compression stroke, at the appropriate time for commencement of injection, the solenoid valve recloses creating a hydraulic link between the metering and timing plungers, so that the fuel is pressurized. Once the fuel is sufficiently pressurized, the delivery valve opens and the fuel is delivered to the injector via the high pressure delivery line. Each pumping cylinder delivers fuel to a respective associated injector for each cylinder of the engine. Compressibility of the fuel and the length of the high pressure delivery line is compensated for by an electronic control module and by making the timing plunger of a larger diameter than the metering plunger so as to obtain a fast pumping rate.

摘要翻译： 一种泵线喷嘴燃料喷射系统，其中供应泵联接到具有多个泵送缸的高压泵，每个泵缸具有凸轮驱动的定时柱塞和浮动计量柱塞。 在回缩行程期间，形成在活塞之间的定时室的流动被电磁阀阻挡，同时燃料进入计量室，在泵的排放侧，其通过输送相对于高压输送管线封闭 阀。 一旦已经计量了适量的燃料，电磁阀打开，允许燃料流入计量室，平衡计量活塞的相对侧上的压力，从而防止计量柱塞进一步收回，因为定时柱塞继续 缩回 在压缩冲程期间，在适当的开始喷射的时候，电磁阀重新关闭，在计量和定时柱塞之间产生液压连杆，使得燃料被加压。 一旦燃料充分加压，则输送阀打开，并且燃料经由高压输送管线输送到喷射器。 每个泵送缸将燃料输送到发动机的每个气缸的相应的相关联的喷射器。 燃料的压缩性和高压输送管线的长度由电子控制模块补偿，并且使定时柱塞的直径大于计量柱塞，从而获得快速的泵送速率。