Combined engine air/fuel control and catalyst monitoring

Details Combined engine air/fuel control and catalyst monitoring Combined engine air/fuel control and catalyst monitoring

1991-06-28

1992-03-31

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60285, 123489, F01N 318

Patent

active

050996479

ABSTRACT:
An engine air/fuel control and catalyst monitoring means includes a first EGO sensor positioned upstream of a catalyst and a second EGO sensor positioned downstream of the catalyst. Outputs from both EGO sensors are applied to a complementary filter set. The output from the upstream EGO sensor is applied to a high pass filter section and the output from the downstream EGO sensor is applied to a low pass filter section. The summer receives inputs from each of the high pass and low pass filter sections and provides an output to a feedback controller which in turn controls a fuel metering system applying fuel to the engine. The downstream EGO sensor also provides a signal indicative of the efficiency of the catalyst.

REFERENCES:
patent: 4177787 (1979-12-01), Hattori et al.
patent: 4463594 (1984-08-01), Raff
patent: 4534330 (1985-08-01), Osuga et al.
patent: 4691562 (1987-09-01), Abthoff et al.
SAE Paper #800018, "Non-Ideal Properties of ZrO.sub.2 and TiO.sub.2 Exhaust Gas Oxygen Sensors", M. A. Shulman and D. R. Hamburg.

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