초록 ▼

A common rail diesel fuel injection system that uses as many as one high-pressure engine-cam-driven fuel pump per engine cylinder, each of the high-pressure engine-cam-driven fuel pumps being driven directly by the engine cam. The system includes a common rail to receive the outputs of the high-pres

A common rail diesel fuel injection system that uses as many as one high-pressure engine-cam-driven fuel pump per engine cylinder, each of the high-pressure engine-cam-driven fuel pumps being driven directly by the engine cam. The system includes a common rail to receive the outputs of the high-pressure engine-cam-driven fuel pumps to maintain a high and uniform fuel pressure. The system also includes a fuel transfer pump to supply relatively low-pressure fuel to the high-pressure engine-cam-driven fuel pumps. Fuel from the common rail is distributed to solenoid-controlled fuel injectors. The latter have outputs connected to respective pressure regulator valves to regulate fuel pressure and to provide a path, in additional to the injection path, through which fuel flows to reduce injector temperature. An embodiment is included wherein a programmable logic device controls fuel injectors in response to selected engine operation sensor inputs. A further embodiment places the fuel transfer pump under control of the programmable logic device to minimize excess fuel transfer pump operation.

대표청구항 ▼

1. A common rail fuel injection system, comprising:a plurality of high-pressure, engine-cam-driven fuel pumps, each having a fuel input port and a fuel output port; a common rail having a plurality of fuel input ports and a plurality of fuel output ports, each of the engine-cam-driven fuel pump outp

1. A common rail fuel injection system, comprising:a plurality of high-pressure, engine-cam-driven fuel pumps, each having a fuel input port and a fuel output port; a common rail having a plurality of fuel input ports and a plurality of fuel output ports, each of the engine-cam-driven fuel pump output ports being connected to a respective common rail fuel input port; a plurality of solenoid-controlled fuel injectors each having a fuel input port connected to a respective common rail fuel output port; and a fuel transfer pump connected between a source of fuel and each of the fuel input ports of the engine-cam-driven fuel pumps to supply fuel to the engine-cam-driven fuel pumps.