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US 11,674,469 B1Granted
Systems and methods for evaporative emissions systems
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for a diagnostic of a pressure sensor. In one example, a method includes bypassing one or more vapor canisters and determining a condition of the pressure sensor based on feedback from a hydrocarbon sensor.
Claims20
A method, comprising:
- flowing gases directly to a hydrocarbon sensor via a canister bypass;
- and
- diagnosing a condition of a fuel tank pressure transducer (FTPT) based on a response of the hydrocarbon sensor.
A system, comprising:
- a fuel tank;
- a first canister coupled to the fuel tank via a fuel vapor conduit;
- a second canister arranged between the first canister and a third canister, the third canister arranged between the second canister and a hydrocarbon sensor;
- a first canister bypass coupled to the fuel vapor conduit and a first junction between the first canister and the second canister;
- a second canister bypass coupled to the first junction and a second junction between the second canister and the third canister;
- a third canister bypass coupled to the second junction and the hydrocarbon sensor;
- a first bypass valve arranged in the first canister bypass, a second bypass valve arranged in the second canister bypass, and a third bypass valve arranged in the third canister bypass;
- and
- a controller comprising instructions stored on non-transitory memory thereof that when executed cause the controller to:
- execute a diagnostic to determine a condition of a fuel tank pressure transducer (FTPT) in response to feedback from the hydrocarbon sensor.
7 more elements
A fuel system for a vehicle, comprising
- a fuel tank and a fuel tank pressure transducer (FTPT) configured to sense a pressure of the fuel tank via a fuel vapor conduit;
- an evaporative emissions system comprising a plurality of canisters comprising a first canister, a second canister, and a third canister, wherein the first canister is fluidly coupled to the fuel vapor conduit;
- a plurality of canister bypasses comprising a first bypass configured to flow vapors from the fuel vapor conduit to a first junction between the first canister and the second canister, a second bypass configured to flow vapors from the first junction to a second junction between the second canister to the third canister, and a third bypass configured to flow vapors from the second junction to a hydrocarbon sensor;
- a plurality of bypass valves comprising a first bypass valve arranged in the first bypass, a second bypass valve arranged in the second bypass, and a third bypass valve arranged in the third bypass;
- and
- a controller comprising instructions stored on memory thereof that when executed enable the controller to:
- determine entry conditions for being met for a diagnostic of the FTPT;
- and
- diagnose a condition of the FTPT based on feedback from the hydrocarbon sensor.
6 more elements
Dependencies are inferred from the claim text.