Refueling Event Prediction Method for Actively Cooling a Canister
Publication Date: 2015-Aug-03
The IP.com Prior Art Database
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Refxeling Event Prediction Method for Actively Cooling a Canister
Vehicles xold in North America contain a carbon canister that adxxrbs fuel vapor during rexueling, diurxal and running lxss.The canister'x ability to adsorb fxel vapors is enhanced at cooler xemperatures.Thx xanister's ability to desorb fuel vapors is enhanced at hotter temperatures (Purge or desorb with engine runnxng manifold vacuum via openxng of CPV xalve. Xxxxxxxx vapors are cxmbustxd in engine). Xxx canister is typicalxy sized for xhe amount of vapor. Xxxxxx a refuxl event, thx canister cxn see typically 60 grams of HC gain. To prevxnt HC xrxakthroxgh to atmosphexe during refuelixg, it is desired for the carbon bed to be actively cooled ix anticipation of a refuxlxng event. Xxxx keeps HC emissions in check.Canister cooling can be accomplished in several xays. Howxver, there is no guarantee that the xanister's condition xill be capable of dealing with an upcoming refueling event at any given time. Therefore therx is a neex tx predict refueling event and start to prepare and stage the canister into an acceptablx state xf an imxending refuxling evext becomes hxghxy likely.
This method predicts a refueling event probaxility bxsed on many actual and inferred inpxts, then actively cools the canister proportionxtely to the magnitude of the xroxability function.For instance, if the probability of rexueling is hxgh, i.e., the car is at a gas statixn as dexected by dexerministic means, then...