Aisan Kogyo Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Aisan Industry Co., Ltd.

Kenji Koeda

Kazumi Haruta

Shigeru Yoshida

Hideo Yamada

Satoru Ikeda

An apparatus is provided for preventing emission of fuel vapor generated in a fuel tank during fuel supply, including a fuel supplying canister for absorbing the fuel vapor and desorbing the absorbed fuel vapor by an intake air flow in the operation of an internal combustion engine. The fuel supplying canister is provided, on one side of its vessel, with a tank port connected to the fuel tank and a purge port connected to an air intake passage of the internal combustion engine, and also provided with an atmospheric air port for introducing air on the other side thereof. The atmospheric air port includes a switching device for controlling the cross-sectional area of an atmospheric air passage in a manner that the switching device is fully opened during fuel supply, and that at other times a predetermined restriction hole is defined therein. Owing to this structure, the intake pipe negative pressure in the internal combustion engine can be efficiently applied into the canister without degrading the fuel supplying efficiency, so that the desorption of the fuel vapor absorbed in the activated carbon of the canister during fuel supply is much improved. Moreover, the residual fuel vapor in the activated carbon becomes less, and consequently, the lowering or degradation of absorption efficiency of the activated carbon because of aged deterioration can be prevented.

Evaporative emission control system

A canister for adsorption of evaporated fuel in an automobile. The canister operates to decrease leakage of the evaporated fuel when the atmosphere temperature rises or the canister is left as it is for a long time. To this end, the canister according to the invention comprises a first container provided in adjacent to an inlet for evaporated fuel and incorporating therein a liquid-phase component adsorbent, a second container provided on the downstream of the first container and on the side or the top of the first container and filled with an adsorbent, and a third container disposed between the second container and an atmosphere port and filled with an adsorbent. Further, the first, second and third container are integrally formed. With such structure, liquid-phase components of the evaporated fuel are collected by the adsorbent in the first container so that a life span of the adsorbent in the second container can be elongated. Further, since the third container is filled with the adsorbent, the evaporated fuel forcibly discharged from the adsorbent of the second container is collected by the adsorbent in the third container when the atmosphere temperature rises or the canister is left for a long time. Therefore, the evaporated fuel can be prevented from being discharged into the atmosphere.

Canister for adsorbing evaporated fuel

A system for preventing loss of fuel due to evaporation in internal combustion engine, particularly in automotive engine. The system has a casing accommodating a fuel gas absorbent. A separator chamber adapted to separate the liquid phase and gaseous phase of the fuel from each other is disposed in a passage through which a tank port leading from a fuel tank is communicated with the absorbent. The passage is so constructed as to permit only the gaseous phase of the fuel to be sent to the absorbent.

Growing community of inventors

Nagoya, Japan

Kenji Koeda