Purging of evaporated fuel to engine intake with engine fuel cor

Details Purging of evaporated fuel to engine intake with engine fuel cor Purging of evaporated fuel to engine intake with engine fuel cor

1996-08-26

1997-10-28

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, 123357, F02M 3704

Patent

active

056808496

ABSTRACT:
An evaporated fuel gas purging system performs breakdown analysis without deterioration of drivability and exhaust emission even when the amount of purged fuel gas is large. During introduction of negative pressure into the purge system, a control value DUTY sets opening of a purge control valve and a purge flow amount GPG is derived from a map based on differences in the control value DUTY, atmospheric pressure and intake pipe pressure. Thereafter, a purge ratio PGR is calculated from intake air GA and purge flow GPG (PGR=GPG/GA), and a fuel injection correction value FAFLEAK=PGR.times.(FGPGAV-1).times.K1 is calculated, with FGPGAV-1 being the air-fuel ratio feedback correction deviation per 1% purge ratio, and K1 being an error correction coefficient. Then, the fuel injection correction FAFLEAK is guard-processed to maintain it below an upper limit guard value KFLEAKMX.

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patent: 5445133 (1995-08-01), Nemoto
patent: 5469832 (1995-11-01), Nemoto
patent: 5520160 (1996-05-01), Aoto

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