Fuel vapor recovery control system

Details Fuel vapor recovery control system Fuel vapor recovery control system

1989-12-07

1992-01-14

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123519, 606051, F02M 3302

Patent

active

050800787

ABSTRACT:
A control system for an engine having both a fuel vapor recovery system and air/fuel ratio feedback control. The engine is equipped with a venturi in its intake passage. A vapor reservoir is coupled between the fuel vapor recovery system and a nozzle orifice positioned in the venturi throat. Vapor flow into the reservoir is regulated by a solenoid valve responsive to a pressure switch which is referenced to the venturi inlet pressure. Action of the pressure switch maintains reservoir pressure at the venturi inlet pressure such that vapor flow is linearly proportional to inducted air flow regardless of engine manifold pressure. In an alternate embodiment, the fuel tank is coupled to the venturi through a pressure regulating system as described above. The vapor recovery canister is independently coupled to the venturi through a similar pressure control system.

REFERENCES:
patent: 3680318 (1972-08-01), Nakajima
patent: 4026258 (1977-05-01), Ino
patent: 4445336 (1984-05-01), Inoue
patent: 4498443 (1985-02-01), Hasegawa
patent: 4530210 (1985-07-01), Yamazaki
patent: 4664087 (1987-05-01), Hamburg
patent: 4677956 (1987-07-01), Hamburg
patent: 4715340 (1987-12-01), Cook et al.

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