LEAK DIAGNOSIS DEVICE FOR INTANG CANISTER SYSTEM

PROBLEM TO BE SOLVED: To detect lead at any position in an intank canister system. SOLUTION: In a canister 2 disposed in a fuel tank 1, a vaporized fuel introducing passage 7 from a vaporized fuel introducing port 8 inside the fuel tank 1 through a check valve 10, a fresh air introducing passage 21...

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Bibliographische Detailangaben
1. Verfasser:	KOSHO KENYA
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES AUXILIARY DRIVES FOR VEHICLES BLASTING COMBUSTION ENGINES HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS INSTRUMENTATION OR DASHBOARDS FOR VEHICLES LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF TRANSPORTING VEHICLES IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To detect lead at any position in an intank canister system. SOLUTION: In a canister 2 disposed in a fuel tank 1, a vaporized fuel introducing passage 7 from a vaporized fuel introducing port 8 inside the fuel tank 1 through a check valve 10, a fresh air introducing passage 21 from a fresh air introducing port 22 outside the fuel tank 1, and a purge passage 23 to discharge vaporized fuel in the canister 2 with fresh air through a purge control valve 24 to an intake pipe 25 are connected. A three-way selector valve 30 is provided on the purge passage 23, so by changing it, the side of the fuel tank 1 (the vaporized fuel introducing port 8) can be communicated with the side of the purge control valve 24. After setting the inside of the fuel tank 2 at negative pressure while keeping the inside of the canister 2 at atmospheric pressure by changing the three-way selector valve 30, leak diagnosis is conducted based on pressure change in the fuel tank 1 after the purge control valve 24 is closed.