초록 ▼

Disclosed is a fuel vapor treating apparatus, in which fuel vapor evaporated in a fuel tank is not released directly into the atmosphere but is collected and treated. This apparatus is provided with a canister for collecting fuel vapor and a purge line for purging the fuel vapor collected in the can

Disclosed is a fuel vapor treating apparatus, in which fuel vapor evaporated in a fuel tank is not released directly into the atmosphere but is collected and treated. This apparatus is provided with a canister for collecting fuel vapor and a purge line for purging the fuel vapor collected in the canister to an intake passage of an engine. The canister has a first control valve for controlling introduction of fuel vapor thereto. The canister also has a second control valve for controlling the introduction of outside air and the exhaust of gas therefrom. The first control valve communicates with a vapor line extending from the fuel tank and is opened whenever the internal pressure of the fuel tank exceeds a predetermined level to introduce fuel vapor from the fuel tank into the canister. The second control valve is designed to communicate with the atmosphere and is opened whenever fuel is purged through the purge line to the intake passage to introduce outside air into the canister. The second control valve is opened whenever the internal pressure of the canister exceeds a predetermined level to exhaust fuel-free gas left after collection of the fuel. Both the first control valve and the second control valve are diaphragm check valves. The control valves are designed to be readily detached from the canister.

대표청구항 ▼

An apparatus for treating fuel vapor evaporated in a fuel tank, having a canister for collecting the fuel component and allowing a passage of gas, both the fuel component and the gas contained in the fuel vapor which is introduced to the canister through a vapor line, and an air intake passage commu

An apparatus for treating fuel vapor evaporated in a fuel tank, having a canister for collecting the fuel component and allowing a passage of gas, both the fuel component and the gas contained in the fuel vapor which is introduced to the canister through a vapor line, and an air intake passage communicating an engine, said canister having an inlet port for introducing air thereinto based on negative pressure generated in the canister and an outlet port for releasing the gas therefrom based on positive pressure generated in the canister, wherein said fuel vapor is purged to the air intake passage from the canister through a purge line when the engine is in the operation, and wherein the amount of fuel vapor passing through the purge line is controlled by a purge control valve actuated by a duty signal from a controller in accordance with information representing engine operation status, said apparatus comprising: a first valve means provided with the canister, for selectively opening and closing the inlet port, wherein said first valve means opens the inlet port based on said negative pressure in the canister by the fuel vapor purged to the air intake passage from the canister; a second valve means provided with the canister, for selectively opening and closing the outlet port, wherein said second valve means opens the outlet port based on said positive pressure in the canister by the fuel vapor introduced to the canister from the fuel tank; at least one of said first and second valve means including a diaphragm check valve, said diaphragm check valve having a pressure chamber; a pressure passage connecting the pressure chamber with the canister to introduce the negative pressure to the pressure chamber from the canister; and an orifice formed in the pressure passage to dampen the pressure changes downstream thereof with respect to the purge line.