Fuel injector diagnostic for dual fuel engine
AssigneeFord Global Technologies, LLC
InventorRoss Dykstra Pursifull
Life of this patent
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Abstract
Various systems and methods are described for controlling fuel injection of a dual fuel engine which includes first and second fuel rails and first and second fuel pumps. In one example, while pumping is suspended in the second fuel rail, the first fuel is injected to all but one cylinder of the engine and the second fuel is injected to the one cylinder in a predetermined sequence. As such, the fuel injector injecting to the one cylinder is isolated and its performance may be assessed without significantly affecting engine performance.
Claims20
A method for controlling fuel injection of a multi-substance injection engine which includes first and second rails and first and second pumps, comprising:
- suspending pumping of a second substance into the second rail while injecting a first substance to all but a single cylinder of the engine;
- and
- while pumping is suspended in the second rail, injecting the second substance into the single cylinder and correlating pressure decrease in the second rail to injector degradation.
A method for controlling fuel injection of a dual fuel engine which includes first and second fuel rails and first and second fuel pumps, comprising:
- suspending pumping of a second fuel into the second fuel rail while injecting a first fuel to all but a first group of cylinders of the engine;
- while pumping is suspended in the second fuel rail, injecting the second fuel into the first group of cylinders, and correlating pressure decrease in the second fuel rail to injector degradation;
- and
- adjusting fuel injection of the second fuel in the first group of cylinders based on the correlation once pumping of the second fuel is resumed by the second pump.
A system for an engine in a vehicle, comprising:
- a plurality of cylinders, each cylinder having a first and second injector where the first injector is coupled to a first fuel rail and the second injector is coupled to a second fuel rail;
- and
- a control system comprising a computer readable storage medium, the medium comprising instructions for:
- during a first condition, injecting fuel to all cylinders via the first injectors;
- and
- during a second condition:
- injecting fuel to all but one cylinder via the first injectors, and injecting fuel to the one cylinder via only the second injectors;
- and
- suspending pumping of fuel into the second fuel rail while continuing pumping of fuel into the first fuel rail.
Dependencies are inferred from the claim text.