Evaporative fuel control system in internal combustion engine

Details Evaporative fuel control system in internal combustion engine Evaporative fuel control system in internal combustion engine

1995-03-17

1996-03-19

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114, F02M 2508

Patent

active

054996171

ABSTRACT:
In an evaporative fuel control system in an internal combustion engine, a purge gas concentration is estimated by a purge gas concentration estimating device based on an air-fuel ratio correcting factor provided when a purge control valve is in its opened state and an air-fuel ratio correcting factor provided when the purge control valve is in its closed state. A lower limit value of an air-fuel ratio correcting factor, set by an air-fuel ratio correcting factor setting device, is determined by an air-fuel ratio correcting factor limit value setting device in accordance with the purge gas concentration estimated by the purge gas concentration estimating device. Thus, the lower limit value of the air-fuel ratio correcting factor can be varied depending upon the concentration of the purge gas, thereby setting an air-fuel ratio control range corresponding to the concentration of the purge gas.

REFERENCES:
patent: 4683861 (1987-08-01), Breitkreuz et al.
patent: 4841940 (1989-06-01), Uranishi et al.

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