Air-fuel ratio control system for engine

Details Air-fuel ratio control system for engine Air-fuel ratio control system for engine

1990-12-07

1992-01-14

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, F02D 4114, F02D 4122

Patent

active

050800728

ABSTRACT:
An air-fuel ratio control system for an engine has an air-fuel ratio sensor which generates an output value which changes according to an air-fuel ratio in an air-fuel mixture fed to the engine. An upper preset value which corresponds to an output value of the air-fuel ratio sensor for an air-fuel ratio which is larger than a stoichiometric air-fuel ratio and a lower preset value which corresponds to an output value of the air-fuel ratio sensor for an air-fuel ratio which is smaller than the stoichiometric air-fuel ratio are set. They are respectively reduced and increased by a predetermined value at one time at regular intervals, and are shifted each time the output value of the air-fuel ratio sensor exceeds the upper preset value at that time and reduces below the lower preset value at that time, to the output value of the air-fuel ratio sensor at that time. It is determined that the air-fuel ratio sensor is abnormal when the difference between the upper and lower preset values becomes smaller than a predetermined reference difference.

REFERENCES:
patent: 4408584 (1983-10-01), Yabuhara et al.
patent: 4751908 (1988-06-01), Abe et al.
patent: 5020499 (1991-06-01), Kojima et al.

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