Fuel-vapor purge and air-fuel ratio control for automotive engin

Details Fuel-vapor purge and air-fuel ratio control for automotive engin Fuel-vapor purge and air-fuel ratio control for automotive engin

1986-07-28

1990-06-12

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123521, F02M 3900

Patent

active

049323865

ABSTRACT:
A fuel-vapor purge and air-fuel ratio control system controls the amount of fuel vapor to be purged under an engine vacuum into a carburetor of an automotive engine from a charcoal canister and also controls the air-fuel ratio of an air-fuel mixture to be supplied to the carburetor. The fuel vapor is purged form the charcoal canister by applying the engine vacuum to the charcoal canister only when the air-fuel ratio is controlled. The applied engine vacuum may be regulated to control the amount of purged fuel vapor to change in proportion to the amount of air drawn by the engine, or the amount of purged fuel vapor may be increased to an upper limit when the air-fuel ratio is in a normal air-fuel ratio control region, and the amount of purged fuel vapor may be reduced to a lower limit when the air-fuel ratio is outside the normal air-fuel ratio control region. Alternatively, the controlling of the air-fuel ratio may forcibly be brought to a central value of an air-fuel ratio control range when purged fuel vapor is cut off of the amount of purged fuel vapor is abruptly reduced.

REFERENCES:
patent: 4326489 (1982-04-01), Heitert
patent: 4377142 (1983-03-01), Otsuka
patent: 4467769 (1984-08-01), Matsumura
patent: 4630581 (1986-12-01), Shibata
patent: 4641623 (1987-02-01), Hamburg
patent: 4651889 (1987-03-01), Uranishi

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