Oxygen sensor monitoring

Details Oxygen sensor monitoring Oxygen sensor monitoring

1992-06-01

1994-04-26

Hart, Douglas

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

053057279

ABSTRACT:
An on-board oxygen sensor monitoring system includes measuring a first limit cycle of air/fuel controller operation, changing operating parameters of the air/fuel controller and measuring a second limit cycle with the new calibration of the controller. A time constant of the oxygen sensor is calculated as a function of the first and second limit cycle periods and compared to a maximum response rate.

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patent: 4677955 (1987-07-01), Takao
patent: 5020499 (1991-06-01), Kojima
patent: 5048490 (1991-09-01), Nakaniwa
patent: 5052361 (1991-10-01), Ono
patent: 5095743 (1992-03-01), Tomisawa
patent: 5125384 (1992-06-01), Tada

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