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Systems and methods for reducing vehicle evaporative emissions

  • US 10,047,705 B2
  • Filed: 03/14/2016
  • Issued: 08/14/2018
  • Est. Priority Date: 03/14/2016
  • Status: Active Grant
First Claim
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1. A method comprising:

  • operating an engine;

    when an engine is operating, routing vapors from a fuel tank through a purge valve, and routing desorbed vapors from a vapor adsorbent through the purge valve, into the engine for combustion, the desorbed vapors desorbed from the vapor adsorbent via fresh air routed through a three-way vent valve positioned between the vapor adsorbent and atmosphere;

    not operating the engine; and

    when the engine is not operating, changing the routing so that fuel tank vapors are routed through the vapor adsorbent for adsorption and then to an intake manifold of the engine without being routed through the purge valve, the fuel tank vapors routed from the vapor adsorbent to the intake manifold via the three-way vent valve.

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