US 11,674,469 B1
Systems and methods for evaporative emissions systems
Aed Dudar, Canton, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Jun. 28, 2022, as Appl. No. 17/809,401.
Int. Cl. F02D 41/22 (2006.01); F02D 41/00 (2006.01); F02M 25/08 (2006.01)
CPC F02D 41/222 (2013.01) [F02D 41/0037 (2013.01); F02D 41/0045 (2013.01); F02M 25/0836 (2013.01); F02D 2041/223 (2013.01); F02D 2041/228 (2013.01)] 20 Claims
OG exemplary drawing
 
7. 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.