Fault isolation in electronic returnless fuel system
AssigneeGM Global Technology Operations LLC
InventorYoussef A. Ghoneim
Life of this patent
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Abstract
A method for detecting and isolating an actual fault in a fuel delivery system having a fuel pump and a fuel pump motor, includes monitoring fuel pressure, pump current, and pump voltage. Each of a plurality of fault triggers are designated as one of flagged and un-flagged based on at least one of the fuel pressure, the pump current and the pump voltage. The actual fault in the fuel delivery system is isolated from a plurality of possible faults when a condition respective to one of the possible faults is satisfied based on at least one of the plurality of fault triggers designated as flagged and un-flagged.
Claims20
Method for detecting and isolating an actual fault in a fuel delivery system having a fuel pump and a fuel pump motor, comprising:
- monitoring fuel pressure, pump current, and pump voltage;
- designating each of a plurality of fault triggers as one of flagged and un-flagged based on at least one of the fuel pressure, the pump current and the pump voltage;
- analyzing each of a plurality of possible faults associated with a respective fault condition;
- and
- isolating a corresponding one of the plurality of possible faults as the actual fault in the fuel delivery system when a condition respective to the corresponding possible fault is satisfied based on at least one of the plurality of fault triggers designated as one of flagged and un-flagged.
Method for isolating an actual fault in a fuel delivery system having a fuel pump and a fuel pump motor, comprising:
- monitoring fuel pump operating parameters;
- assigning each of a plurality of fault triggers as one of detected and un-detected based on the monitored fuel pump operating parameters;
- individually analyzing each of a plurality of possible faults where each possible fault analyzed has a lower degree of severity than an immediately preceding possible fault analyzed, each possible fault associated with a respective fault condition analyzed as one of satisfied and un-satisfied based on at least one of the assigned plurality of fault triggers;
- isolating a currently analyzed possible fault as the actual fault when the respective fault condition associated with the currently analyzed possible fault is satisfied;
- and
- proceeding to analyze a subsequent possible fault having a lower degree of severity than the currently analyzed possible fault when the respective fault condition associated with the currently analyzed possible fault is not satisfied.
Apparatus for detecting and isolating an actual fault in a fuel delivery system having a fuel pump and a fuel pump motor, comprising:
- an internal combustion engine;
- and
- an electronic returnless fuel delivery system comprising:
- a fuel tank,
- a fuel pump positioned within the fuel tank and supplying fuel from the fuel tank to the engine, and
- a controller in communication with the fuel pump and configured to:
- monitor fuel pressure, pump current, pump voltage and a desired fuel pressure,
- designate each of a plurality of fault triggers as one of flagged and un-flagged based on at least one of the fuel pressure, the pump current and the pump voltage,
- analyze each of a plurality of possible faults associated with a respective fault condition;
- and
- isolate a corresponding one of the plurality of possible faults as the actual fault in the fuel delivery system when a condition respective to the corresponding possible fault is satisfied based on at least one of the plurality of fault triggers designated as one of flagged and un-flagged.
Dependencies are inferred from the claim text.