Toyota Jidosha Kabushiki Kaisha

Masashi Miyamaru

Katsuhiko Teraoka

An apparatus for treating fuel vapor from a fuel tank. The apparatus includes a canister for collecting the fuel vapor generated in the fuel tank through a vapor line, a purge line for purging the collected fuel in the canister into an intake passage, and a control valve disposed midway on the purge line. The fuel tank, the canister, the vapor line and the purge line are connectable to one another to define a closed space. A testing device, which is separately provided from the apparatus, tests the sealing of the closed space after the pressure for the testing is introduced into the closed space from the testing device. The apparatus includes an atmospheric valve for connecting the canister with the atmosphere. The atmospheric valve has a diaphragm and a first and a second pressure chambers. The pressure in the canister is introduced into the first pressure chamber. The second pressure chamber has a first pressure port. The purge line has a second pressure port defined between the canister and the control valve. A pipe connects the first pressure port with the second pressure port. The pipe has a single introduction port. The introduction port communicates with the atmosphere when the test is not performed and is connected to the testing device when the test is performed. A check valve is located in the pipe between the introduction port and the second pressure port. The check valve allows the pressure for the testing introduced from the introduction port to be supplied to the second pressure port and prevents the pressure acting on the second pressure port from being released through the introduction port.

Growing community of inventors

Nagoya, Japan

Masashi Miyamaru