Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1992-12-17
1993-10-19
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123694, F02M 5100
Patent
active
052536327
ABSTRACT:
An air/fuel mixture control system for an internal combustion engine uses a closed-loop controller which varies the air/fuel mixture in response to the oxygen level in the engine's exhaust emissions to achieve stoichiometry. The oxygen sensor produces a binary signal indicating either a rich or a lean mixture. The controller responds changes in binary sensor signal by delivering fuel at a fixed rate until either (1) the sensor responds by indication an oxygen level change or (2) a predicted transport delay interval expires. In the event the predicted interval expires before the sensor responds, the fixed rate is adjusted in an effort to obtain the desired level change within the allotted interval. In the event the level change is delayed beyond a limit, the predicted transport delay interval is enlarged. If the control system raises the fuel delivery rate above a predetermined rich limit, or below a predetermined lean limit, the base rate from which the initial rates are derived is increased or decreased respectively.
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H. Katashiba et al., "Fuel Injection Control Systems that Improve Three Way Catalyst Conversion Efficiency", SAE Technical Paper Series, Feb., 1991, (No. 910390).
Ford Motor Company
Lippa Allan J.
May Roger L.
Nelli Raymond A.
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