Internal combustion engine control

Details Internal combustion engine control Internal combustion engine control

1996-05-03

1997-07-29

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4100

Patent

active

056513534

ABSTRACT:
Internal combustion engine air/fuel ratio control provides for individual engine cylinder air/fuel ratio balancing through sensing of individual cylinder air/fuel ratio and through comparison of sensed individual cylinder air/fuel ratio to a target air/fuel ratio with air/fuel ratio control command correction prescribed on a cylinder-by-cylinder basis. The target air/fuel ratio may be determined as an overall average cylinder actual air/fuel ratio. An additional control loop is provided for driving a value representing overall engine air/fuel ratio toward a desired air/fuel ratio, such as the stoichiometric ratio. Correction values are learned gradually for each engine cylinder and stored and recalled as a function of an engine operating level.

REFERENCES:
patent: 4869222 (1989-09-01), Klassen
patent: 5531208 (1996-07-01), Hasegawa et al.
patent: 5548514 (1996-08-01), Hasegawa et al.
patent: 5566071 (1996-10-01), Akazaki et al.

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