Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1990-06-21
1991-11-19
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123440, F02M 5100
Patent
active
050657283
ABSTRACT:
A system and method for controlling an air/fuel mixture ratio of an air mixture fuel sucked into an internal combustion engine are disclosed in which an operating variable (PL, PR) of an air/fuel mixture ratio feedback correction coefficient (LAMBDA) is controlled so as to compensate for the deviation of the air/fuel mixture ratio (an average air/fuel mixture ratio) from a target air/fuel mixture ratio (stoichiometric air/fuel mixture ratio) according to an output characteristic variation of an oxygen sensor installed in an exhaust passage, the oxygen sensor outputting a voltage according to the air/fuel mixture ratio. A degree of deterioration of the oxygen sensor, i.e., the output characteristic variation of the oxygen sensor is determined according to a response balance between a rich side response and lean side response of the oxygen sensor, the response balance being determined on the basis of at least one of a plurality of parameters, a first parameter being a speed of change in the output voltage of the oxygen sensor, a second parameter being a duration of time during which the air/fuel mixture ratio is started to change toward the target air/fuel mixture ratio, and a third parameter bein the rich and lean control durations of time during which the system controls the air/fuel mixture ratio toward the target air/fuel mixture ratio with the feedback correction coefficient (LAMBDA).
REFERENCES:
patent: 4870938 (1989-10-01), Nakaniwa
patent: 4911129 (1990-03-01), Tomisawa
patent: 4913118 (1990-04-01), Watanabe
patent: 4933863 (1990-06-01), Okano et al.
patent: 4938194 (1990-07-01), Kato et al.
patent: 4947818 (1990-08-01), Kamohara et al.
Japan Electronic Control Systems Co. Ltd.
Nelli Raymond A.
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