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Method for diagnosing leaks downstream of the purge flow control orifice

  • US 9,752,539 B2
  • Filed: 04/27/2016
  • Issued: 09/05/2017
  • Est. Priority Date: 06/18/2015
  • Status: Active Grant
First Claim
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1. A vapor purge system for an internal combustion engine, comprising:

  • a purge canister;

    a purge valve having a housing including an input port in communication with the purge canister and including an output port in communication with an intake system; and

    an intake system component defining a first bore portion receiving the output port with a first seal member disposed therebetween, the intake system component further including a second bore portion receiving a housing portion of the purge valve with a second seal member disposed therebetween, wherein the first and second seal members are positioned such that when the housing is pulled away from the intake system component and the first seal member is out of engagement between the first bore and the output port, the second seal member can remain in engagement between the second bore portion and the housing portion of the purge valve, so that a disconnect or other leak condition at the output port can be detected without any leakage to the atmosphere.

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