Diagnosing a fuel tank condition

A method is presented for diagnosing a condition in a fuel vapour purge system. An engine 200, fuel tank 210 and carbon canister 230 are connected in a three-way connection. The engine 200 can be selectively isolated by a purge control valve (270, figure 3), and the fuel tank 210 can be selectively...

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Hauptverfasser:	BRENT EDWARD SEALY, JEFFREY ALLEN DOERING, JAE DOO CHUNG
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING COMBUSTION ENGINES HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MECHANICAL ENGINEERING SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF WEAPONS
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Beschreibung
Zusammenfassung:	A method is presented for diagnosing a condition in a fuel vapour purge system. An engine 200, fuel tank 210 and carbon canister 230 are connected in a three-way connection. The engine 200 can be selectively isolated by a purge control valve (270, figure 3), and the fuel tank 210 can be selectively isolated by a fuel tank control valve (250, figure 3). The operation of both valves is coordinated by an electronic engine controller 120. By isolating the fuel tank 210 and comparing the actual rate of change of the internal tank pressure (from the tank pressure sensor 260) to the estimated rate of change (from engine operating conditions eg bulk fuel temperature) it is possible to determine if a condition (eg missing fuel cap) occurred, and whether it is in the tank or in the vapour purge lines.