Bidirectional adsorbent-canister purging

A method for combusting a vapor of a fuel accumulated in an adsorbent canister in a vehicle, the vehicle having an engine and a fuel tank coupled to the adsorbent canister, the method comprising:

• when a throttle-inlet pressure of the engine exceeds a threshold, enabling a first valve to open to allow air compressed by a compressor to flow into the adsorbent canister, causing the air to become enriched in the vapor;
• when the throttle-inlet pressure of the engine is below the threshold, preventing the first valve from opening;
• and
• when the engine is running, opening a second valve to allow the vapor to flow from the fuel tank to an intake of the engine, and flowing the effluent enriched in the vapor into the intake of the engine.

A method for combusting a vapor of a fuel accumulated in an adsorbent canister in a vehicle, the vehicle having an engine and a fuel tank coupled to the adsorbent canister, the method comprising:

• when a throttle-intake pressure of the engine is greater than barometric pressure, metering compressed air and flowing the metered, compressed air through the adsorbent canister along a first flow path to yield a first canister effluent enriched in the vapor;
• when a manifold air pressure of the engine is less than barometric pressure, flowing air through the adsorbent canister along a second flow path different that the first flow path to yield a second canister effluent enriched in the vapor, and, metering the second canister effluent;
• when the engine is running, venting the fuel tank to an intake of the engine via a buffer, and flowing the first and second canister effluents into the intake of the engine;
• and
• when the vehicle is being refueled, venting the fuel tank to the adsorbent canister, and preventing the fuel tank from being vented to the intake of the engine.