Method and system for determining and controlling a/f ratio in l

Details Method and system for determining and controlling a/f ratio in l Method and system for determining and controlling a/f ratio in l

1996-12-13

1997-11-25

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

731173, 364431054, F02D 4114

Patent

active

056900724

ABSTRACT:
A method and system for determining and controlling air/fuel ratio during lean engine operation relies on applying a small fuel pulse width modulation to the engine and synchronously measuring the effect of the modulation on related engine event periods. This effect is utilized in estimating air/fuel ratio, which is then compared to the desired air/fuel ratio. The difference between the estimated air/fuel ratio and the desired air/fuel ratio is used in controlling the air/fuel ratio to the desired air/fuel ratio.

REFERENCES:
patent: 4991555 (1991-02-01), Tamekio

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