Catalyst monitoring using ego sensors

Details Catalyst monitoring using ego sensors Catalyst monitoring using ego sensors

G - Physics

01

N

G01N 27/27 (2006.01) F01N 3/20 (2006.01) F01N 11/00 (2006.01) G01M 15/00 (2006.01)

Patent

CA 2114787

- 27 - ABSTRACT CATALYST MONITORING USING EGO SENSORS A method of monitoring, while on board an automotive vehicle, one or more of catalyst performance, engine misfire, and combustion quality, the vehicle having an internal combustion engine (13) equipped with a catalyst (21) for converting noxious emissions of the engine, comprising: (i) exposing at least one pair of EGO sensors to (55,56,59,60) substantially the same emissions either exiting from the engine or from the catalyst, one (55) of the EGO sensors having its electrode highly catalytic, and the other sensor (56) having its electrode low-to-noncatalytic; (ii) comparing the outputs of the sensor electrodes (amplitude, frequency, or phase shift) to determine if there is a sufficient differential to indicate a misfire or poor combustion in the case of the sensors being located downstream of the engine exhaust but upstream of the catalyst, or indicating poor catalyst efficiency in the case of the sensors being placed substantially immediately downstream of the catalyst. Two pairs of sensors (55,56,59,60) may be used, a first pair being placed substantially immediately upstream of the catalyst (21) and the second pair being placed substantially immediately downstream of the catalyst, the pairs of EGO sensors being incorporated into a closed-loop feedback control of the engine fuel control system. Figure 6.

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