Exhaust gas purifying system of internal combustion engine

Details Exhaust gas purifying system of internal combustion engine Exhaust gas purifying system of internal combustion engine

1998-08-21

2000-08-15

Denion, Thomas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 60295, 123674, 701109, 701115, F01N 300

Patent

active

061018090

ABSTRACT:
To optimally operate a NOx-occluded type catalytic converter installed in an exhaust passage of an internal combustion engine, there are employed an air/fuel ratio sensor for detecting an exhaust air/fuel ratio of the exhaust gas downstream of the converter; and a control device for controlling an air/fuel ratio of a combustible mixture fed to the engine. The control device comprises a first section for causing the converter to effect NOx-reduction treatment by making the air/fuel ratio of the combustible mixture richer and/or stoichiometric; and a second section for learning and correcting the condition of the NOx-reduction treatment, based on the exhaust air/fuel ratio detected by the sensor under the NOx-reduction treatment.

REFERENCES:
patent: 4761950 (1988-08-01), Nagai et al.
patent: 5335493 (1994-08-01), Uchida et al.
patent: 5337557 (1994-08-01), Toyota
patent: 5473887 (1995-12-01), Takeshima et al.
patent: 5483945 (1996-01-01), Kobayashi et al.
patent: 5778666 (1998-07-01), Cullen et al.

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