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US 2017/0363055 A1Published application
Systems and methods for evap leak testing
AssigneeFord Global Technologies, LLC
InventorsAed M. Dudar, Russell Randall Pearce, Dennis Seung-Man Yang, Mark W. Peters
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Abstract
Methods and systems are provided for regulating evaporative emissions from a fuel system. In one example, a method may comprise spinning an engine unfueled responsive to a hydrocarbon concentration at a fresh air end of a fuel vapor canister increasing above a first threshold. The method may comprise spinning the engine to pull hydrocarbons away until a hydrocarbon concentration at a purge end of the fuel vapor canister, opposite the fresh air end, increases above a second threshold.
Claims20
A method comprising:
- spinning an engine unfueled responsive to a hydrocarbon concentration at a fresh air end of a fuel vapor canister increasing above a first threshold, to pull hydrocarbons away from the fresh air end of the fuel vapor canister.
A method comprising:
- running a leak test for an evaporative emissions control (EVAP) system;
- and
- responsive to determining that hydrocarbon breakthrough from a vent side of a fuel vapor canister of the EVAP system is imminent:
- stopping the leak test;
- opening a canister purge valve to fluidically couple the canister to an intake of an engine;
- and
- spinning the engine without fuel.
4 more elements
A vehicle system comprising:
- an engine including one or more engine cylinders;
- an evaporative emissions control (EVAP) system including a fuel vapor canister;
- a fuel system including a fuel tank;
- an evaporative leak check module (ELCM) including a vacuum pump for detecting leaks of one or more of the EVAP system and fuel system;
- and
- a controller with computer readable instructions stored in non-transitory memory for:
- redistributing hydrocarbons within the canister by spinning the engine unfueled in response to hydrocarbon levels at a fresh air end of the canister increasing above a threshold.
4 more elements
Dependencies are inferred from the claim text.