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Systems and methods for evaporative emissions testing

  • US 9,759,166 B2
  • Filed: 09/09/2015
  • Issued: 09/12/2017
  • Est. Priority Date: 09/09/2015
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • following a vehicle-off event, waking an electronic controller to indicate an absence of a vapor leak in an evaporative emissions system responsive to vacuum in the evaporative emissions system attaining a vacuum threshold, the vacuum threshold determined at the vehicle-off event by the electronic controller and the vacuum threshold based on ambient conditions and fuel conditions, and sleeping the electronic controller after determining the vacuum threshold.

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