| 摘要 |
<p>A common rail diesel fuel injection system (10) 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 (12, 14, 16, 18) being driven directly by the engine cam. The system (10) includes a common rail (26) to receive the outputs of the high-pressure engine-cam-driven fuel pumps (12, 14, 16, 18) to maintain a high and uniform fuel pressure. The system (10) also includes a fuel transfer pump (62) to supply relatively low-pressure fuel to the high-pressure engine-cam-driven fuel pumps (12, 14, 16, 18). Fuel from the common rail (26) is distributed to solenoid-controlled fuel injectors (32, 34, 36, 38). The latter have outputs connected to respective pressure regulator valves (52, 54, 56, 58) 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 (62) under control of the programmable logic device to minimize excess fuel transfer pump operation.</p> |
