Fuel-vapor emission-control system for controlling the amount of

Details Fuel-vapor emission-control system for controlling the amount of Fuel-vapor emission-control system for controlling the amount of

1996-02-14

1997-07-15

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123520, F02M 2508

Patent

active

056473320

ABSTRACT:
The amount of flow in a canister is controlled, in a fuel-vapor emission-control system, in response to the operating condition of an engine, control being performed of the size of a release port on the canister responsive to the amount of purge, thereby enabling a large purging amount. An electromagnetic valve capable of changing the surface area of the port is provided at the atmospheric side of a port of the canister. The degree of opening of this electromagnetic valve is varied, depending on the conditions of refueling, traveling, and parking, and during a purge, the opening of the electromagnetic valve when the amount of purge is large is made larger then when the amount of purge is small. By doing this, the recovery of hydrocarbons from the canister when purging is done is speed up, thus improving the working capacity of the canister.

REFERENCES:
patent: 5295472 (1994-03-01), Otsuka et al.
patent: 5359978 (1994-11-01), Kidokoro et al.
patent: 5460142 (1995-10-01), Denz et al.
patent: 5460143 (1995-10-01), Narita
patent: 5474047 (1995-12-01), Cochard et al.
patent: 5501198 (1996-03-01), Koyama
patent: 5505182 (1996-04-01), Denz et al.

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