Systems and methods for purging a fuel vapor canister in dual-path purge systems
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
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Abstract
Methods and systems are provided for improving fuel vapor storage canister purging operations for vehicles with dual-path purge systems. In one example, a method may include purging fuel vapors from a fuel vapor storage canister to an engine of a vehicle via a single path, and in response to an unmetered increase in a concentration of the fuel vapors being purged to the engine via the single path, switching the fuel vapors to be purged to the engine via two paths simultaneously. In this way, fuel vapors may be distributed in time along the two paths, which may lower an effective concentration of fuel vapors entering the engine and may thereby avoid degradation of engine operating conditions.
Claims20
A method comprising:
- purging fuel vapors from a fuel vapor storage canister to an engine of a vehicle via a single path;
- and
- in response to an inferred increase in a concentration of the fuel vapors being purged to the engine via the single path, switching to purging the fuel vapors to the engine via two paths including the single path, simultaneously.
A method comprising:
- purging fuel vapors from a fuel vapor storage canister to an intake of an engine via one of a vacuum path or a boost path;
- and
- in response to an indication of imminent engine hesitation or stall, purging the fuel vapors from the fuel vapor storage canister to the engine via both the vacuum path and the boost path.
A system for a vehicle, comprising:
- an engine;
- a compressor coupled to an engine intake for providing a boosted aircharge to the engine;
- a fuel vapor storage canister positioned in an evaporative emissions system;
- a dual-path purge system that includes a vacuum path and a boost path for purging fuel vapors from the fuel vapor storage canister to the engine, the vacuum path including a conduit that couples the fuel vapor storage canister to the engine intake downstream of the compressor and the boost path including an ejector system that couples the fuel vapor storage canister to an air intake system at a position upstream of the compressor;
- and
- a controller with computer readable instructions stored in non-transitory memory that when executed cause the controller to:
- purge the fuel vapor storage canister to the engine via one of the vacuum path and the boost path, and responsive to a vapor slug event where a concentration of fuel vapors being purged to the engine increases, adjusting one or more of a vacuum level in an intake manifold of the engine and a boost pressure provided by the compressor to purge the fuel vapors to the engine intake along both the vacuum path and the boost path simultaneously.
Dependencies are inferred from the claim text.