| 摘要 |
<p>A fuel system includes a pair of electronically controllable high pressure fuel pumps (22) operable to supply high pressure fuel from a lower pressure fuel source to a high pressure fuel collection chamber (34) having a pressure sensor (72) associated therewith. The fuel collection chamber (34) feeds an electronically controllable valve operable to dispense the high pressure fuel to a fuel distribution unit supplying fuel to a number of fuel injectors. A control computer (58) is provided for controlling the high pressure fuel pump (22) and valve in response to requested fueling, engine speed and fuel pressure provided by the pressure sensor (72). The accumulator pressure profile is processed in accordance with various techniques forming part of the present invention for diagnosing pressure sensor (72) in-range failures, fuel pump injector valve blow shut failures and the failure of one of the fuel pumps (22).</p> |
