Internal combustion engine air-fuel ratio feedback control metho

Details Internal combustion engine air-fuel ratio feedback control metho Internal combustion engine air-fuel ratio feedback control metho

1987-06-01

1988-04-26

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02D 4114

Patent

active

047397403

ABSTRACT:
A method of feedback-controlling the air-fuel ratio of a mixture, supplied to an internal combustion engine, by at least one of proportional control and integral control in dependence upon the results of a comparison between the output of an exhaust gas concentration sensor and a predetermined reference value. The method includes obtaining the ratio of a first time period required for an output value from the exhaust gas concentration sensor to make a transition from a peak value on a rich side to a predetermined reference value with respect to the predetermined reference value, and a second time period required for the output value to make a transition from a peak value on a lean side to the predetermined reference value with respect to the predetermined reference value, and altering, in dependence upon the ratio obtained, at least one predetermined control factor applied to control of the air-fuel ratio.

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patent: 4461258 (1984-07-01), Becker et al.
patent: 4491921 (1985-01-01), Sugiyama et al.
patent: 4624232 (1986-11-01), Saito et al.

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