Method and system for determining and controlling A/F ratio duri

Details Method and system for determining and controlling A/F ratio duri Method and system for determining and controlling A/F ratio duri

1997-05-05

1999-06-29

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

123685, F02D 4114

Patent

active

059153598

ABSTRACT:
A method and system for determining and controlling air/fuel ratio during engine cold start operation relies on applying a monotonically decreasing 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.

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