Evaporative emission control
First Claim
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1. A method for an engine, comprising:
- displacing an amount of intake air from an intake passage upstream of a diverter valve arranged in the intake passage with air received from a fuel system canister, wherein each of the intake air and the air received from the fuel system canister are received at the diverter valve, and wherein the diverter valve is arranged upstream of an intake throttle.
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Abstract
Methods and systems are provided for purging a multi-port canister into an engine intake. Air is circulated through the canister and a resulting purge air is directed to an intake passage upstream of a throttle in engine configured with a throttle body. An amount of fresh intake air received at the intake passage is corresponding decreased.
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Citations
19 Claims
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1. A method for an engine, comprising:
displacing an amount of intake air from an intake passage upstream of a diverter valve arranged in the intake passage with air received from a fuel system canister, wherein each of the intake air and the air received from the fuel system canister are received at the diverter valve, and wherein the diverter valve is arranged upstream of an intake throttle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for an engine coupled to a fuel system canister, comprising:
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during purging conditions, mixing a first amount of intake air with a second, different amount of air received from the fuel system canister at a first valve arranged in an engine intake passage upstream of an intake throttle; and delivering the mixed air to an engine intake manifold. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A vehicle system, comprising:
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an engine including an intake manifold; an air intake passage for delivering intake air to the intake manifold, the intake passage including a diverter valve; a fuel tank configured to provide fuel to an engine cylinder; a multi-port canister coupled to the fuel tank and further coupled to the air intake passage at the diverter valve, the multi-port canister configured to store fuel vapors generated in the fuel tank, the multi-port canister including a plurality of vent ports coupled to a vent control valve for receiving fresh air in the multi-port canister, the multi-port canister further including a plurality of purge ports coupled to a purge control valve for delivering purge air from the multi-port canister to the diverter valve; a controller with computer readable instructions for, in response to a multi-port canister load being higher than a threshold, opening the purge control valve and the vent control valve; adjusting a position of the diverter valve to mix purge air from the multi-port canister with intake air received at the diverter valve from the intake passage upstream of the diverter valve; and delivering the air mixture to the intake manifold; and wherein the intake passage includes an intake throttle positioned downstream of the diverter valve, and wherein adjusting the position of the diverter valve to mix purge air from the multi-port canister with the intake air received at the diverter valve from the intake passage upstream of the diverter valve includes mixing purge air from the multi-port canister with intake air at the diverter valve, upstream of the throttle. - View Dependent Claims (17, 18, 19)
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Specification