Method and system for detecting PHEV EVAP system recirculation tube reliability
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United States of America Patent
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Aug 9, 2016
Grant Date -
Mar 26, 2015
app pub date -
Sep 23, 2013
filing date -
Sep 23, 2013
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Abstract
A method for detecting blockage within a recirculation tube of the evaporative emission control system of a PHEV measures the rise in interior temperature of a canister of the EVAP system, during the process of refueling, and notes an initial state of loading of the canister before refueling, indicative of the amount of hydrocarbons contained within the canister It is inferred that the recirculation tube is operative reliably if the rise in canister temperature is below a pre-determined temperature value.
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