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US 12,518,576 B2Granted
Systems and methods for reducing saddle fuel tank depressurization time
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for diagnosing valves of a fuel system. In one example, the fuel system is configured to reduce a depressurization time of one or more fuel tanks arranged therein. A method for diagnosing the valves includes monitoring a number of pre-mature shut-off events during a refueling event to determine if the valves are degraded.
Claims18
A method, comprising:
- diagnosing a valve arranged in a conduit fluidly coupling a primary fuel tank and a secondary fuel tank during a refueling event or following the refueling event, wherein the valve is determined to be stuck closed during the refueling event if the refueling event comprises a shut-off at an upper threshold fuel level.
A system, comprising:
- an engine;
- a fuel system coupled to the engine, the fuel system comprising a primary fuel tank, a secondary fuel tank, and a canister;
- wherein
- the primary fuel tank is fluidly coupled to the secondary fuel tank via a conduit, and wherein the secondary fuel tank is fluidly coupled to the canister via a load conduit, the conduit comprising a first valve and the load conduit comprising a second valve;
- and
- a controller with computer-readable instructions stored on memory that when executed cause the controller to:
- diagnose a first condition of one or more of the first valve and the second valve during a refueling event;
- diagnose a second condition of one or more of the first valve and the second valve based on a canister load;
- and
- determine the second valve is stuck open in response to a fuel tank pressure transducer (FTPT) reading a pressure greater than a lower value.
7 more elements
A method for a fuel system comprising a first fuel tank and a second fuel tank, the method comprising:
- diagnosing a stuck closed condition of one or more of a first valve and a second valve during a refueling event based on a number of pre-mature refueling shut-offs and feedback from a fuel tank pressure transducer (FTPT);
- and
- diagnosing a stuck open condition of one or more of the first valve and the second valve based on a load of a canister;
- wherein the first valve is arranged in a conduit fluidly coupling the first fuel tank to the second fuel tank, and wherein the second valve is arranged in a load conduit fluidly coupling the second fuel tank to the canister.
1 more element
Dependencies are inferred from the claim text.