Catalyst soundness assessment device

Details Catalyst soundness assessment device Catalyst soundness assessment device

1996-03-06

1998-05-12

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 320

Patent

active

057492220

ABSTRACT:
In an engine provided with a catalytic converter in an exhaust passage, the degree of deterioration of the catalyst in the converter is determined. Sensors detecting whether the air-fuel mixture supplied to the engine is rich or lean, are installed upstream and downstream of the converter, and an air-fuel ratio is feedback controlled based on the signal output from the upstream sensor. The soundness of the catalyst is assessed based on a difference between a change-over time of the upstream sensor and a change-over time of the downstream sensor, and a distinction is made between full catalyst deterioration and medium catalyst deterioration by introducing a dispersion value in the assessment process.

REFERENCES:
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patent: 5154055 (1992-10-01), Nakane et al.
patent: 5214915 (1993-06-01), Schneider et al.
patent: 5280707 (1994-01-01), Nakashima et al.
patent: 5390490 (1995-02-01), Brooks
patent: 5417061 (1995-05-01), Maeda et al.
patent: 5448886 (1995-09-01), Toyoda

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