Evaporative fuel vapor emission control systems

  • US 10,323,553 B2
  • Filed: 08/14/2017
  • Issued: 06/18/2019
  • Est. Priority Date: 10/10/2012
  • Status: Active Grant
First Claim
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1. An evaporative emission control canister system, including one or more canisters and comprising:

  • a fuel-side adsorbent volume having an effective incremental adsorption capacity at 25°

    C. of greater than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane; and

    at least one subsequent adsorbent volume having an effective incremental adsorption capacity at 25°

    C. of less than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane, an effective butane working capacity (BWC) of less than 3 g/dL, and a g-total BWC of ≤

    6 grams,wherein the fuel-side adsorbent volume having an effective incremental adsorption capacity at 25°

    C. of greater than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane, and the at least one subsequent adsorbent volume are located within a single canister, or in separate canisters that are connected to permit sequential contact by fuel vapor, and wherein the canister system has a two-day diurnal breathing loss (DBL) of no more than 20 mg at no more than 100 BV of purge applied after a 40 g/hr butane loading step.

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