Gaseous fuel rail sensor diagnostics
AssigneeFord Global Technologies, LLC
InventorRoss Dykstra Pursifull
Life of this patent
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Abstract
Embodiments for indicating fuel rail temperature sensor degradation are provided. In one embodiment, an engine method comprises delivering gaseous fuel to a cylinder based on feedback from a fuel rail temperature sensor, and during select conditions, indicating fuel rail temperature sensor degradation based on a difference between measured fuel rail temperature and an expected temperature. In this way, measured fuel rail temperature may be correlated with other engine temperatures to detect sensor degradation.
Claims20
An engine method, comprising:
- delivering gaseous fuel to a cylinder based on feedback from a fuel rail temperature sensor;
- and
- during select conditions, indicating fuel rail temperature sensor degradation based on a difference between measured fuel rail temperature and an expected temperature.
A method for a fuel system configured to deliver a gaseous fuel to an engine, comprising:
- during a first condition, indicating fuel rail temperature sensor degradation if measured fuel rail temperature is outside a threshold range from measured under hood temperature;
- and
- during a second condition, indicating fuel rail temperature sensor degradation if measured fuel rail temperature is above a threshold.
A vehicle system comprising:
- a fuel tank configured to store a gaseous fuel;
- a fuel rail for delivering the gaseous fuel to an engine;
- and
- a controller including instructions to:
- deliver a desired amount of gaseous fuel to the engine based on feedback from a fuel rail temperature sensor;
- and
- during idle engine operation, indicate fuel rail temperature sensor degradation if a measured fuel rail temperature differs from a measured under hood temperature.
Dependencies are inferred from the claim text.