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

1996-12-11

1998-05-26

Dombroske, George M.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

73 2332, 731181, 123688, F02D 4114, G01M 1500

Patent

active

057583102

ABSTRACT:
An apparatus for determining whether or not an air-fuel ratio sensor, which is arranged in an exhaust system of an internal combustion engine to detect the air-fuel ratio of exhaust gas, is activated. The apparatus has a heater for heating the air-fuel ratio sensor, a detector for detecting whether or not the air-fuel ratio sensor has reached a half-activated state to start changing the output thereof after the start of the engine, a unit for integrating power supplied to the heater from the start of the engine until the air-fuel ratio sensor reaches the half-activated state, a unit for estimating, according to the integrated power, the power to be supplied to the heater to bring the air-fuel ratio sensor to a full-activated state, and a unit for determining that the air-fuel ratio sensor is in the full-activated state once the estimated power has completely been supplied to the heater.

REFERENCES:
patent: 4759328 (1988-07-01), Blumel et al.
patent: 5036820 (1991-08-01), Fujimoto et al.
patent: 5172677 (1992-12-01), Suzuki
patent: 5392643 (1995-02-01), O'Kennedy et al.
patent: 5454259 (1995-10-01), Ishii et al.
patent: 5505183 (1996-04-01), Sinha et al.

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