Apparatus for determining the condition of an air-fuel ratio sen

Details Apparatus for determining the condition of an air-fuel ratio sen Apparatus for determining the condition of an air-fuel ratio sen

1996-05-24

1997-09-30

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123697, F02D 4114

Patent

active

056717210

ABSTRACT:
An apparatus to determine whether or not an air-fuel ratio sensor is fully activated is provided. In the apparatus according to the present invention, first, the point of the start of the fluctuation of the output voltage of the air-fuel ratio sensor is detected, and thereafter the fully activated state of the air-fuel ratio sensor is determined by detecting the point when the accumulated value of the difference between the present heater resistance and the standard heater resistance after the above point of the start of the fluctuation of the output voltage of the air-fuel ratio sensor, exceeds a predetermined threshold.

REFERENCES:
patent: 4938196 (1990-07-01), Hoshi et al.
patent: 4958611 (1990-09-01), Uchinami et al.
patent: 5036820 (1991-08-01), Fujimoto et al.
patent: 5054452 (1991-10-01), Denz
patent: 5111792 (1992-05-01), Nagai et al.
patent: 5148795 (1992-09-01), Nagai et al.
patent: 5172677 (1992-12-01), Suzuki
patent: 5340462 (1994-08-01), Suzuki

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