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System and methods for reducing vehicle evaporative emissions

  • US 9,856,830 B2
  • Filed: 01/08/2016
  • Issued: 01/02/2018
  • Est. Priority Date: 01/08/2016
  • Status: Active Grant
First Claim
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1. A method for a vehicle, comprising:

  • monitoring a fuel injector that supplies fuel to cylinder of an engine, the cylinder having intake and exhaust valves; and

    following an engine-off event and responsive to an undesired fuel outflow from the fuel injector;

    positioning the intake valve and the exhaust valve to respective open and closed positions;

    coupling the cylinder to a fuel vapor storage canister;

    purging fuel vapors from the undesired fuel outflow through the intake valve to the canister; and

    during the purging fuel vapors from the undesired fuel outflow through the intake valve to the canister, monitoring a pressure in a fuel rail coupled to a plurality of fuel injectors, and, responsive to fuel rail pressure reaching a fuel rail pressure threshold, coupling an exhaust manifold of the engine to the canister to purge fuel vapors in the exhaust manifold to the canister.

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