Evaporated fuel purge device for engine

Details Evaporated fuel purge device for engine Evaporated fuel purge device for engine

1996-03-05

1997-08-12

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123698, F02D 4114, F02M 2508

Patent

active

056555075

ABSTRACT:
Based upon a running condition of an engine, the air-fuel ratio of the fuel mixture supplied to the engine is controlled by open loop control to a target air-fuel ratio. The engine includes a mechanism which adsorbs evaporated fuel from a fuel tank, and a purge conduit which supplies a purge gas which is a mixture of this adsorbed fuel and air to the engine in a predetermined running condition. The purge flow rate is changed according to change in the target air-fuel ratio by controlling the flow rate through the purge conduit according to the proportion between the target air-fuel ratio and a predetermined value. By doing this, deviations in the air-fuel ratio precipitated by purging are eliminated, and the accuracy of air-fuel ratio control is enhanced.

REFERENCES:
patent: 5090388 (1992-02-01), Hamburg et al.
patent: 5216998 (1993-06-01), Hosoda et al.
patent: 5423307 (1995-06-01), Okawa et al.
patent: 5501206 (1996-03-01), Takebayashi
patent: 5511526 (1996-04-01), Hamburg et al.
patent: 5572980 (1996-11-01), Nakagawa et al.

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