Apparatus for controlling a fuel system of an internal combustion engine

Apparatus for controlling a fuel system of an internal combustion engine, comprising:

• means for producing a fueling request;
• means for sensing pressure of pressurized fuel in a fueling system and producing pressure signal corresponding thereto;
• means responsive to said fueling request and said pressure signal 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;
• and
• means responsive to said pressure signal for replacing said pump command signal to said fuel pump with a predicted pump command signal if said pressure signal indicates abnormal operation of said means for sensing pressure.

Apparatus for controlling a fuel system of an internal combustion engine, comprising:

• a high pressure fuel pump responsive to a pump command signal for providing high pressure fuel from a lower pressure source of fuel;
• an accumulator receiving said high pressure fuel from said fuel pump and collecting said high pressure fuel therein;
• means for sensing engine speed and producing an engine speed signal corresponding thereto;
• and
• a control computer responsive to a fuel request signal and said engine speed signal to produce a fuel command, said control computer producing said pump command signal as a function of said fuel command if said fuel command exceeds a fuel threshold level while said engine speed signal is in excess of a speed threshold level.

Apparatus for controlling a fuel system of an internal combustion engine, comprising:

• a high pressure fuel pump responsive to a pump command signal for providing high pressure fuel from a lower pressure source of fuel;
• an accumulator receiving said high pressure fuel from said fuel pump and collecting said high pressure fuel therein;
• means for sensing fuel pressure within said accumulator and producing a pressure signal corresponding thereto;
• means for producing a fuel request signal;
• means for sensing engine speed and producing an engine speed signal corresponding thereto;
• and
• a control computer responsive to said fuel request signal to produce a fuel command, said control computer responsive to an abnormality in said pressure signal to provide said pump command signal as a function of said engine speed signal and said fuel command.