초록 ▼

A fuel system includes an electronically controllable high pressure fuel pump operable to supply high pressure fuel from a lower pressure fuel source to a high pressure fuel collection chamber having a pressure sensor associated therewith. The fuel collection chamber feeds an electronically controll

A fuel system includes an electronically controllable high pressure fuel pump operable to supply high pressure fuel from a lower pressure fuel source to a high pressure fuel collection chamber having a pressure sensor associated therewith. The fuel collection chamber 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 is provided for controlling the high pressure fuel pump and valve in response to requested fueling, engine speed and fuel pressure provided by the pressure sensor. The control computer is normally operable to drive the fuel pump as a function of fuel pressure and a reference pressure, which is based on requested fueling, and to control the valve as a function of commanded fueling, which is a function of engine speed and a reference speed based on requested fueling, and fuel pressure. In a first limp home mode, the control computer is operable to drive the fuel pump as a function of fuel pressure and commanded fueling if abnormal operation of the high pressure fuel pump is detected. In this mode, the valve is controlled only as a function of fuel pressure. In a second limp home mode, the control computer is operable to drive the fuel pump with a predicted fuel pump command based on the fuel command and engine speed, if abnormal operation of the pressure sensor is detected. In this mode, the valve is controlled as a function of the fuel command and the reference pressure or a default pressure.

대표청구항 ▼

[ What is claimed is:] [1.] Apparatus for controlling a fuel system of an internal combustion engine, comprising:means for producing a fueling request;means responsive to said fueling request for producing a reference pressure;means responsive to said reference pressure for producing a pump command

[ What is claimed is:] [1.] Apparatus for controlling a fuel system of an internal combustion engine, comprising:means for producing a fueling request;means responsive to said fueling request for producing a reference pressure;means responsive to said reference pressure for producing a pump command signal;a fuel pump responsive to said pump command signal for providing high pressure fuel from a lower pressure fuel source;means responsive to said fueling request for producing a fuel command;means for sensing engine speed and producing an engine speed signal corresponding thereto; andmeans responsive to said fuel command and said engine speed signal for replacing said reference pressure with said fuel command in said means for producing said pump command signal if said fuel command exceeds a fuel threshold value while said engine speed signal exceeds a speed threshold level.